, in some examples, one or more of the helmet UI devices 114 and/or helmet sensors 115 may be positioned within the welding helmet 102. In some examples, the helmet display screen 112 may be considered part of the helmet UI devices 114. In some examples, the helmet UI devices 114 and/or helmet sensors 115 may be electrical communication with the helmet circuitry 116.

In some examples, the helmet circuitry 116 may include helmet processing circuitry, helmet memory circuitry, helmet UI circuitry, and/or helmet communication circuitry. In some examples, the helmet UI circuitry may drive the helmet UI devices 114. In some examples, the welding helmet 104 may communicate with one or more external devices via one or more signals sent or received by the helmet communication circuitry.

In the example of FIG. 1, the welding-type tool 102 is shown applying a welding arc 118 to a joint 120 between two workpieces 122 (e.g., to weld the workpieces together at the joint 120). As shown, the welding-type tool 102 is connected to a welding cable 124 that leads to, and puts the welding-type tool 102 in electrical communication with, the welding-type equipment 106. In some examples, welding-type power (and/or consumables) for the welding arc 118 may be provided to the welding-type tool 102, by the welding equipment 106, via the welding cable 124. In some examples, the welding-type tool 102 may transmit one or more signals to the welding-type equipment 106 when activated (e.g., via the welding cable 124), and the welding-type equipment 106 may provide the welding-type power (and/or consumables) for the arc 118 in response.

In the example of FIG. 1, the welding-type equipment 106 comprises a welding-type power supply 126, wire feeder 128, and gas supply 130. In some examples, the wire feeder 128 may be configured to feed wire to the welding-type tool 102 (e.g., via welding cable 124). In some examples, the gas supply 130 may be configured to route shielding gas to the welding-type tool 102 (e.g., via welding cable 124). In some examples, the power supply 126 may be configured to route welding-type power to the welding-type tool 102 (e.g., via welding cable 124).

In the example of FIG. 1, the power supply 126 includes power communication circuitry 132, power control circuitry 134, and power conversion circuitry 136 interconnected with one another. In some examples, the power supply 126 may communicate with one or more external devices via one or more signals sent or received by the power communication circuitry 132. In some examples, the power conversion circuitry 136 may be configured to receive input power (e.g., from a generator, a battery, mains power, etc.) and convert the input power to welding-type output power, such as might be suitable for use by the welding-type tool 102 for welding-type operations. In some examples, the power control circuitry 134 may be configured to control operation of the power communication circuitry 132 power conversion circuitry 136, wire feeder 128, and/or gas supply 130 (e.g. via one or more control signals) in accordance with one or more welding parameters.

In the example of FIG. 1, the welding-type equipment 106 further includes an operator interface 138. In some examples, the operator interface 138 may comprise one or more display screens, touch screens, knobs, buttons, levers, switches, microphones, speakers, lights, and/or other mechanisms through which an operator 110 may provide input to, and/or receive output from, the welding-type equipment. For example, an operator 110 may use the operator interface 138 to input one or more welding parameters (e.g., target voltage, current, wire feed speed, wire/filler type, wire/filler diameter, gas type, gas flow rate, welding-type process, material type of workpiece 122, position of welding-type process, etc.). As another example, the operator 110 may use the operator interface 138 to view and/or otherwise understand the current welding parameters of the welding-type equipment 106.

While shown as part of the power supply 126 in FIG. 1, in some examples, the operator interface 138, power control circuitry 134, and/or power communication circuitry 132 (and/or some other control/communication circuitry) may be part of the wire feeder 128 and/or gas supply 130. In some examples, the welding-type equipment 106 may be omitted entirely, or may be mock and/or simulated welding-type equipment 106, such as may be used for training, simulated, and/or mock welding-type operations. While not shown for the sake of simplicity, in some examples, the welding-type equipment 106 may also be connected to, and/or provide power to (e.g., via a cable and/or clamp), a welding bench 140, and/or the workpiece(s) 122 supported by the welding bench 140.

In the example of FIG. 1, the welding-type equipment 106 is further shown connected to a computing system 108 having a computing device 142 and several computing user interface (UI) devices 144. In the example of FIG. 1, the computing UI devices 144 include a display screen 146, a keyboard 148, a mouse 150, a stack light 152 with a variety of different (e.g., color, shape, size, etc.) lights that may be illuminated in various ways (e.g., based on one or more received signals), and a vibration device 154 that may provide vibration feedback in various ways/patterns (e.g., based on one or more received signals).

In some examples, the computing UI devices 144 may be in (e.g., wired and/or wireless) communication with the computing device 142. In some examples, the display screen 146 may be a touch screen. In some examples, the display screen 146 may include one or more speakers and/or microphones. While shown as a desktop computer in the example of FIG. 1, in some examples, the computing device 142 may instead be some other appropriate computational apparatus, such as, for example, a laptop computer, a tablet computer, smart phone, other mobile device, and/or a web server. Though shown as being physically connected to the welding-type equipment 106 via a wire cable, in some examples, the computing device 142 may be in wireless communication with the welding-type equipment 106 (and/or welding helmet 104). While shown as a separate and distinct entity in the example of FIG. 1, in some examples, the computing system 108 may be implemented via the welding-type equipment 106, welding helmet 104, and/or a sensor module 200 (discussed below with respect to FIGS. 2a-2b).

FIGS. 2a-2b show enlarged views of an example sensor module 200. In the example of FIG. 2a, the sensor module 200 has an annular module housing 202 on which is disposed several module input/output (I/O) devices 204. In some examples, the module I/O devices 204 include one or more knobs, buttons, levers, switches, (e.g., touch) display screens, microphones, speakers, haptic devices, lights (e.g., LEDs), and/or other appropriate I/O devices. While some module I/O devices 204 are shown on the module housing 202 in the example of FIG. 2a, in some examples, other module I/O devices 204 may be disposed within the module housing 202.

In the example of FIG. 2a, the sensor module 200 includes module circuitry 212 and a module power supply 214 disposed within the module housing (discussed further below with respect to FIG. 3). As shown, the sensor module 200 also has an inertial measurement unit (IMU) 206, a current sensor 208, and other sensors 210 (e.g., a camera and/or optical sensors) disposed within the module housing 202. While one IMU 206 and one current sensor 208 is shown in the example of FIG. 2a, in some examples the sensor module 200 may include multiple IMUs 206 and/or current sensors 208.

In some examples, the current sensor 208 may be a Hall Effect sensor configured to detect when current is flowing to the welding-type tool 102 (e.g., through the hollow center of the annular module housing 202). In some examples, the current sensor 208 may alternatively, or additionally, physically connect to the conductor(s) carrying current from the welding-type equipment 106 to the welding-type tool 102 (e.g., through the welding cable 124), and/or through the welding-type tool 102 to an electrode 201 at the end of the welding-type tool 102 (see, e.g., FIG. 2b). In some examples, the current sensor 208 may alternatively, or additionally, physically connect to the conductor(s) carrying the trigger signal(s) from the welding-type tool 102 to the welding-type equipment 106. In some examples, the other sensors 210 may include one or more electromagnetic field (EMF) sensors, thermal sensors, acoustic sensors, optical sensors, ultrasonic sensors, and/or other appropriate sensors.

In some examples, the IMU 206 may include one or more accelerometers, gyroscopes, and/or magnetometers (e.g., compasses). In some examples, the accelerometer(s) of the IMU 206 may detect the direction(s) and/or magnitude(s) of linear acceleration(s) experienced by the sensor module 200 along all 3 axes (e.g., due to gravity, movement, etc.). In some examples, the majority of the measured acceleration will be due to the force of gravity during the relatively slow motions associated with welding-type operations.

In some examples, the gyroscope(s) and/or accelerometer(s) of the IMU 206 may detect and/or measure angular motions and/or angular velocities of the sensor module 200 about all three axes. In some examples, measurements of the gyroscope(s) and/or accelerometer(s) may be integrated over time to yield absolute yaw, pitch, and/or roll angles.

In some examples, the magnetometer is used to increase the stability and accuracy of rotation measurements about a gravity vector. In some examples, data from the magnetometer(s) may be considered unreliable and/or ignored when an EMF sensor detects a significant electromagnetic field (e.g., with strength above a threshold), when the current sensor 208 detects a current above a threshold, and/or when there is some other indication (e.g., from the welding-type tool 102, welding-type equipment 106, helmet sensor(s) 115, etc.) that a (e.g., live) welding-type operation is occurring. In some examples, the magnetometer may be manually (e.g., using I/O devices 204), and/or automatically, disabled when the data from the magnetometer(s) becomes unreliable, when a welding-type operation is occurring nearby, and/or when there is a substantial electromagnetic field nearby.

In some examples, data from the gyroscope(s), accelerometer(s), and/or magnetometer may be combined using a sensor fusion technique (e.g., Complementary Filter, Kalman Filter, etc.) to yield accurate linear and/or angular motion data. In some examples where multiple IMUs 206 are used, the data from the IMUs 206 (and/or information derived from the data) may be combined (e.g., averaged) to increase accuracy and/or alleviate the negative impact of drift. In some examples where multiple IMUs 206 are used, and the data of one IMU 206 (and/or its sensor(s)) drifts more than a threshold relative to the data of the other IMUs 206 (and/or their sensor(s)), the drifting IMU 206 (and/or its sensor(s)) may be ignored, and the sensor module 200 may continue to operate using the other IMUs 206. In some examples, the sensor module 200 may track a movement and/or orientation of the welding-type tool 102 using the detections and/or measurements of the accelerometer(s), gyroscope(s), and/or magnetometer(s) of the IMU(s) 206.

In the example of FIG. 2b, the sensor module 200 is shown attached to a rear portion of a handle 216 of the welding-type tool 102. More particularly, the sensor module 200 is secured to the handle 216 of the welding-type tool 102 by hose clamps 218. In some examples, other mechanisms may instead, or additionally, be used to secure the sensor module 200 to the welding-type tool 102, such as, for example, hook and loop fasteners, adhesive, screws, bolts, clamps, and/or other appropriate mechanisms. FIG. 2b also shows a sensor module 250 (e.g., similar to the sensor module 200) integrated into, rather than attached to, the handle 216 of the welding-type tool 102.

FIG. 3 is a block diagram showing an example welding technique monitoring system 300. As shown, the welding technique monitoring system 300 includes a monitoring device 302, the sensor module 200, and the welding-type equipment 106, in communication with one another. While shown as a separate entity in the example of FIG. 3, in some examples, some or all of the monitoring device 302 may be implemented by the sensor module 200 and/or welding-type equipment 106. In some examples, some or all of the monitoring device 302 may be implemented by the computing device 142 and/or welding helmet 104.

In the example of FIG. 3, the monitoring device 302 includes monitoring circuitry 304. As shown, the monitoring circuitry 304 includes monitoring memory circuitry 306, monitoring processing circuitry 308, monitoring communication circuitry 310, and monitoring UI circuitry 312 interconnected with one another via a common electrical bus. In the example of FIG. 3, the welding technique monitoring system 300 also includes a monitoring UI 314 in communication with monitoring device 302. In some examples, the monitoring UI 314 may be implemented by the computing UI devices 144, helmet UI devices 114, operator interface 138 of the welding-type equipment 106, and/or module I/O devices 204 of the sensor module 200.

In the example of FIG. 3, the sensor module 200 includes the module I/O devices 204, IMU 206, current sensor 208, other sensors 210, module circuitry 212, and module power supply 126. As shown, the module power supply 214 is connected to a power port 220. In some examples, the power supply 126 may receive external power via the power port 220 (e.g., via a power cord connected to the power port 220). While not shown for the sake of simplicity, in some examples, the power supply 126 may be electrically connected (and/or provide power to) to the module I/O devices 204, IMU 206, current sensor 208, other sensors 210, and/or module circuitry 212.

In the example of FIG. 3, the module circuitry 212 includes module memory circuitry 222, module processing circuitry 224, module communication circuitry 226, and module I/O circuitry 228 interconnected with one another via a common electrical bus. As shown, the module circuitry 212 is in electrical communication with the module I/O devices 204, IMU 206, current sensor 208, and other sensors 210. While shown as separate, in some examples, some or all of the module circuitry 212 (or additional module circuitry 212) may be part of the IMU 206, current sensor 208, and/or other sensors 210.

In some examples, the monitoring UI circuitry 312 and/or module I/O circuitry 228 may comprise one or more drivers for the monitoring UI 314 and/or module I/O devices, respectively. In some examples, the monitoring UI circuitry 312 and/or module I/O circuitry 228 may be configured to generate one or more signals representative of input received via the monitoring UI 314 and/or module I/O devices, respectively, and provide the signal(s) to the bus. In some examples, the monitoring UI circuitry 312 and/or module I/O circuitry 228 may also be configured to control the monitoring UI 314 and/or module I/O devices, respectively, to generate one or more outputs in response to one or more signals (e.g., received via the bus).

In some examples, the monitoring communication circuitry 310 and/or module communication circuitry 226 may include one or more wireless adapters, wireless cards, cable adapters, wire adapters, dongles, radio frequency (RF) devices, wireless communication devices, Bluetooth devices, IEEE 802.11-compliant devices, WiFi devices, cellular devices, GPS devices, Ethernet ports, network ports, lightning cable ports, cable ports, etc. In some examples, the monitoring communication circuitry 310 and/or module communication circuitry 226 may be configured to facilitate communication via one or more wired media and/or protocols (e.g., Ethernet cable(s), universal serial bus cable(s), etc.) and/or wireless mediums and/or protocols (e.g., cellular communication, general packet radio service (GPRS), near field communication (NFC), ultra high frequency radio waves (commonly known as Bluetooth), IEEE 802.11x, Zigbee, HART, LTE, Z-Wave, WirelessHD, WiGig, etc.). In some examples, the monitoring communication circuitry 310 and/or module communication circuitry 226 may be coupled to one or more antennas to facilitate wireless communication.

In some examples, the monitoring communication circuitry 310 and/or module communication circuitry 226 may be configured to facilitate internal and/or external communications. In some examples, the monitoring communication circuitry 310 and/or module communication circuitry 226 may receive one or more signals (e.g., from each other and/or the welding-type equipment 106) decode the signal(s), and provide the decoded data to the electrical bus. As another example, the monitoring communication circuitry 310 and/or module communication circuitry 226 may receive one or more signals from the electrical bus (e.g., representative of one or more inputs received via the monitoring UI circuitry 312 and/or I/O circuitry 308) encode the signal(s), and transmit the encoded signal(s) to an external device.

In some examples, the monitoring processing circuitry 308 and/or module processing circuitry 224 may comprise one or more processors, controllers, and/or graphical processing units (GPUs). In some examples, the monitoring processing circuitry 308 and/or module processing circuitry 224 may comprise counter circuitry and/or clock circuitry. In some examples, the monitoring processing circuitry 308 and/or module processing circuitry 224 may be configured to execute machine readable instructions stored in the monitoring memory circuitry 306 and/or module memory circuitry 222.

In the example of FIG. 3, the monitoring memory circuitry 306 and module memory circuitry 222 includes (and/or stores) a welding technique monitoring process 400. The technique monitoring process 400 is shown as being part of (and/or stored in) both the monitoring memory circuitry 306 and module memory circuitry 222 to indicate that, in some examples, either or both the monitoring device 302 and/or sensor module 200 may perform part, or all, of the technique monitoring process 400. In the discussion below, the general term memory is sometimes used to refer to monitoring memory circuitry 306 and/or module memory circuitry 222. In the discussion below, certain items and/or information is sometimes described as being included, stored, and/or recorded in memory as a shorthand for specifying that data representative of those items and/or information is included, stored, and/or recorded in memory.

In some examples, the technique monitoring process 400 may comprise machine readable instructions stored in memory and/or configured for execution by the monitoring processing circuitry 308 and/or module processing circuitry 224. In some examples, the technique monitoring process 400 may be implemented via discrete circuitry (e.g., of the monitoring processing circuitry 308 and/or module processing circuitry 224) rather than, or in addition to, instructions stored in the monitoring memory circuitry 306 and/or module memory circuitry 222. In the discussion below, the term processing circuitry is sometimes used to refer to the monitoring processing circuitry 308 and/or module processing circuitry 224.

While not shown in the example of FIG. 3, in some examples, the monitoring memory circuitry 306 and/or module memory circuitry 222 may also include (and/or store) machine readable instructions comprising counter and/or clock programs. In some examples, the memory circuitry 306 and/or module memory circuitry 222 may also include (and/or store) one or more of the thresholds discussed herein. In some examples, the monitoring memory circuitry 306 and/or module memory circuitry 222 may also include (and/or store) values for one or more determined, target, present, and/or past parameters, such as, for example, welding parameters (e.g., voltage, current, wire feed speed, gas flow rate, etc.), welding technique parameters (e.g., work angle, travel angle, travel speed, travel direction, etc.), weave parameters (e.g., frequency, weave width, dwell time, etc.), sensor parameters (e.g., sensor orientation reference frame, tool orientation vector, etc.), joint parameters (e.g., joint orientation vector, base plate perpendicular vector, base plate surface vector, etc.), and/or operation parameters (e.g., job type/identifier(s), operator identifier(s), weld cell identifier(s), project identifier(s), welding procedure specification (WPS) information, work order information, equipment type/identifier(s), weld number information, etc.). In some examples, one or more parameters may be associated with timestamp information, one or more other parameters, and/or other information. In some examples, the technique monitoring process 400 may use and/or update one or more of the stored parameters during operation.

FIG. 4 is a flowchart illustrating operation of an example technique monitoring process 400. In some examples, during the technique monitoring process 400, the processing circuitry uses sensor data from the sensor module 200 to track an orientation of the welding-type tool 102 and/or provide real-time feedback regarding welding technique parameters based on the orientation of the welding-type tool 102. As used herein, real-time means occurring immediately while allowing for processing time, to create the impression of immediacy to a user. In some examples, during the technique monitoring process 400, the processing circuitry also uses joint characteristic information to derive the welding technique parameters. In some examples, during the technique monitoring process 400, simple calibration processes, and/or certain assumptions (e.g., based on common welding practices), may be used to obtain the joint characteristic information necessary for welding technique monitoring.

In the example of FIG. 4, the technique monitoring process 400 begins at block 402, where the processing circuitry performs certain setup procedures. In some examples, the setup procedures may include identifying certain (e.g., welding, operation, etc.) parameters at that will be used during the technique monitoring process 400. In some examples, this identification may involve input from the operator 110 (e.g., via the monitoring UI 314 and/or module I/O devices 204). In some examples, this identification may involve communication with the welding-type equipment 106. In some examples, certain parameters may be automatically identified based on other, previously identified, parameters. In some examples, the setup procedures of block 402 may include setting up, initiating, and/or calibrating the sensor module 200.

In some examples, the processing circuitry may prompt the operator 110 (e.g., via the monitoring UI 314 and/or module I/O devices 204) to setup the sensor module 200 at block 402. For example, the processing circuitry may prompt the operator 110 to attach the sensor module 200 to the welding-type tool 102 (if not already attached), and/or provide an input (e.g., via the monitoring UI 314 and/or module I/O devices 204) when the attachment is complete. As another example, the processing circuitry may prompt the operator 110 to turn on the sensor module 200 (if not already turned on), and/or provide an input (e.g., via the monitoring UI 314 and/or module I/O devices 204) when the sensor module 200 has been turned on.

In some examples, the sensor module 200 may set (or reset) an internal reference frame 502 at block 402 (see, e.g., FIG. 5a), and save the reference frame 502 in memory. In some examples, after the sensor module 200 sets, resets, and/or saves its reference frame 502, the sensor module 200 may track changes to its reference frame 502 using the IMU 206. For example, the gyroscope(s) and/or accelerometer(s) of the IMU 206 of the sensor module 200 may detect and/or measure angular motions of the sensor module 200 that may impact the reference frame 502 of the sensor module 200. In some examples, the sensor module 200 may continually update its reference frame 502 based on sensor data from the IMU 206 (and/or other sensors), and/or save the updated reference frame(s) 502 in memory. In such a way, the sensor module 200 may keep track of its own orientation relative to an (e.g., arbitrary) initial orientation. In some examples, the sensor module 200 may keep timestamped records of its orientation reference frame(s) 502, and/or changes to its orientation reference frame(s) 502, over time.

In some examples, the processing circuitry may additionally prompt the operator 110 (e.g., via the monitoring UI 314 and/or module I/O devices 204) to position the welding-type tool 102 in a particular (e.g., known) orientation at block 402. For example, the processing circuitry may prompt the operator 110 to position the welding-type tool 102 such that a nozzle 299 is pointing down towards the ground in a direction parallel to gravity (see, e.g., FIG. 5b). In such an orientation, an electrode 201 guided by the nozzle 299, and/or other structures within the nozzle 299 (e.g., a contact tip) is also pointing down towards the ground in a direction parallel to gravity. In examples where the welding-type tool 102 does not include a nozzle 299 (e.g., for stick welding and/or SMAW), the processing circuitry may prompt the operator 110 to position the welding-type tool 102 such that the electrode 201 is pointing down towards the ground in a direction parallel to gravity. In some examples, the processing circuitry may prompt the operator 110 (e.g., via the monitoring UI 314 and/or module I/O devices 204) to provide a particular input (e.g., via the monitoring UI 314 and/or module I/O devices 204) when the welding-type tool 102 is positioned in the particular (e.g., known) orientation.

In response to input indicating the welding-type tool 102 is positioned in the particular (e.g., known) orientation, the processing circuitry may record a tool orientation vector 504 (see, e.g., FIG. 5b). In some examples, the tool orientation vector 504 may correspond to a direction parallel to the direction (e.g., an electrode 201 of) the welding-type tool 102 is pointing (e.g., towards a workpiece 122 and/or joint 120). In some examples, the tool orientation vector 504 may correspond to a direction parallel to a longitudinal (and/or traveling) direction of the electrode 201, such as, for example when the electrode is within and/or extending from the nozzle 299.

In some examples, the processing circuitry may record the tool orientation vector 504 relative to the reference frame 502 of the sensor module 200. For example, where the welding-type tool 102 is positioned such that the nozzle 299 (and/or electrode 201) is pointing down towards the ground in a direction parallel to gravity, the processing circuitry may record the tool orientation vector 504 as being parallel to the direction of (e.g., acceleration due to) gravity measured by the accelerometer(s) of the IMU 206. Using the recorded tool orientation vector 504, the sensor module 200 may be able to translate changes in the orientation of its own reference frame 502 (e.g., tracked via the gyroscope(s) and/or accelerometer(s) of the IMU 206) to changes in the orientation of the welding-type tool 102.

FIG. 5a shows an example of a reference frame 502 of the sensor module 200 at initiation. As shown, the reference frame 502 is depicted using three arrows intersecting at a point to represent the standard three coordinate axes and (e.g., 0, 0, 0) origin point. In the example of FIG. 5a, the reference frame 502 is depicted as being similar to a reference frame of the reader to indicate that the sensor module 200 has just been initiated and has yet to experience any change in orientation (e.g., due to movement of the welding-type tool 102).

The welding technique monitoring system 300 has no information as to the orientation of the welding-type tool 102 when the sensor module is first initiated (e.g., as shown in FIG. 5a). However, if an operator 110 positions the welding-type tool 102 in a particular (e.g., known) orientation and provides a corresponding input, as discussed above, the welding technique monitoring system 300 can get information as to the orientation of the welding-type tool 102. FIG. 5b shows an example of how the welding-type tool 102 might be positioned at block 402 so that the welding technique monitoring system 300 can get information as to the orientation of the welding-type tool 102.

In the example of FIG. 5b, the welding-type tool 102 is positioned with its nozzle 299 and electrode 201 pointing downwards in a direction parallel to gravity. A tool orientation vector 504 representative of this orientation is shown extending downwards from the nozzle 299 and electrode 201, also parallel to the direction of gravity. FIG. 5b also shows the tool orientation vector 504 extending downwards from the origin of the reference frame 502 of the sensor module 200. In some examples, the processing circuitry may record in memory the tool orientation vector 504 in relation to the reference frame 502 of the sensor module 200, and/or record some offset (and/or other information) that allows for a quick determination of the tool orientation vector 504 relative to the reference frame 502 of the sensor module 200.

In some examples, the welding-type tool 102 may be fixed and/or held in the orientation shown in FIG. 5b (or some other known orientation) during recordation of the tool orientation vector 504. In some examples, this may be easier if some structure is used to fix the welding-type tool in place and secure against movement. In the example of FIG. 5b, a calibration block 506 is shown for this purpose. As shown, the calibration block 506 is depicted below the welding-type tool 102 with a hole sized to snugly fit the nozzle 299 of the welding-type tool 102 and secure the welding-type tool 102 against movement during calibration. In some examples, some other mechanism (e.g., clamp, stand, fixture, fasteners, etc.) may be used to secure the welding-type tool 102 in proper orientation and/or minimize movement during calibration. In some examples, any of the structures described in U.S. patent application Ser. No. 15/004,801, filed Jan. 22, 2016, entitled “Manual Tool Tracking and Guidance With Inertial Measurement Unit,” the contents of which are being hereby incorporated by reference in their entirety, may be used to help secure the welding-type tool 102 against movement during calibration and/or recordation of the tool orientation vector 504.

In some examples, once recorded, the tool orientation vector 504 may be used to track the orientation of the welding-type tool 102. As discussed above, the orientation of the reference frame 502 of the sensor module 200 may be tracked using the IMU(s) 206. As the tool orientation vector 504 is recorded in relation to the reference frame 502 of the sensor module 200, tracking of the orientation of the reference frame 502 may allow for tracking of the tool orientation vector 504.

The relationship between the orientation of the welding-type tool 102 and the orientation of the reference frame 502 of the sensor module 200 is exhibited in FIGS. 5a-5b. As shown, the orientation of the reference frame 502 is different in FIG. 5a as compared to FIG. 5b. In particular, the reference frame 502 in FIG. 5b is shown rotated clockwise with respect to the orientation of the reference frame 502 in FIG. 5a. The change in orientation of the reference frame 502 of the sensor module 200 between FIG. 5a and FIG. 5b is the same as the change in orientation of the welding-type tool 102 between FIG. 5a and FIG. 5b. Because the sensor module 200 is attached to the welding-type tool 102, the sensor module 200 moves in the same way, and/or rotates to the same degree, as the welding-type tool 102. This similarity of movement allows for tracking the orientation of the welding-type tool 102 (and/or the tool orientation vector 504) by tracking orientation of the sensor module 200 (and/or its reference frame 502); provided the tool orientation vector 504 is properly calibrated and/or recorded with respect to the reference frame 502 of the sensor module 200 at block 402 of the technique monitoring process 400.

In some examples, the processing circuitry may record several different tool orientation vectors 504 at block 402. For example, where the welding-type tool 102 is a clamp-type stick welding torch 1000 (see, e.g., FIG. 10a), the processing circuitry may record a different tool orientation vector 504 for each slot 1002 of a clamping jaw 1004 of a clamp-type stick electrode holder 1006 that holds the stick electrode 201. As another example, where the welding-type tool 102 is a twist-type stick welding torch 1200 (see, e.g., FIG. 12a), with a head 1202 that holds a stick electrode 201, the processing circuitry may record a different tool orientation vector 504 for each discrete pivotal position of electrode holding head 1202.

In some examples, the processing circuitry may identify one of the recorded tool orientation vectors 504 as the “active” tool orientation vector 504 at block 402. For example, the operator 110 may select (e.g., via the monitoring UI 314 and/or module I/O devices 204), one of the electrode slots 1002 or pivotal positions as being in use (and/or “active”), and the processing circuitry may identify the corresponding tool orientation vector 504 as the “active” tool orientation vector 504. In some examples, the processing circuitry may use the active tool orientation vector 504 (e.g., in combination with sensor data from the IMU(s) 206 and other sensor) to track the orientation of the welding-type tool 102, determine the joint characteristic vector(s), determine the welding technique parameter(s), and perform other functions of the technique monitoring process 400. In some examples, the processing circuitry may continue to use the active tool orientation vector 504 in the performance of the technique monitoring process 400 until a different active tool orientation vector 504 is identified/selected.

If (and/or when) the operator 110 uses a different slot 1002 or pivotal position, the operator 110 need not stop to recalibrate the tool orientation vector 504. Instead, the processing circuitry may be able to quickly switch to a different tool orientation vector 504 in response to an indication that a different slot 1002 or pivotal position is being (or will be) used. In such examples, the processing circuitry may identify the tool orientation vector 504 that corresponds to a selected/indicated slot 1002 or pivotal position, and use that tool orientation vector 504 as the active tool orientation vector 504. By recording (and/or calibrating) all the different possible tool orientation vectors 504 in the beginning of the technique monitoring process 400, the operator 110 (and/or processing circuitry) can quickly and easily switch between slots 1002, pivotal positions, and/or tool orientation vectors 504 during the technique monitoring process 400, without the need to stop for recalibration.

FIG. 10a shows an example of a clamp-type stick welding torch 1000 having a plurality of slots 1002. As shown, the clamp-type stick welding torch 1000 includes a stick electrode 201 and a clamp-type electrode holder 1006 that holds the stick electrode 201. The clamp-type electrode holder 1006 includes a cylindrical handle 1008 connected at one end to a pair of clamping jaws 1004 that hold the stick electrode 201.

In some examples, the jaws 1004 and/or handle 1008 of the clamp-type electrode holder 1006 comprise an inner portion and an outer portion. In some examples, the inner portion may be made of an electrically conductive material (e.g., metal). In some examples, the outer portion may be made of an electrically insulating material (e.g., rubber). In some examples, an end of the handle 1008 opposite the jaws 1004 includes an opening configured to receive and/or connect to conductors of the welding cable 124, such that electrical current may be conducted through the welding cable 124, handle 1008, and/or jaws 1004 to the stick electrode 201 held by the jaws 1004.

In the example of FIG. 10a, the sensor module 200 is attached to the handle 1008 near an end of the handle 1008 opposite the jaws 1004. As shown, the clamp-type electrode holder 1006 further includes a trigger 1010 connected to the jaws 1004 and handle 1008. In some examples, the jaws 1004 may be opened when an operator 110 supplies sufficient force to the trigger 1010. After opening the jaws 1004, the operator 110 may insert, remove, and/or replace the stick electrode 201. Once the jaws 1004 are open, the operator 110 may also change the position/orientation of the stick electrode 201 (e.g., relative to the handle 1008 and/or jaws 1004) by changing in which slot 1002 of the jaws 1004 the stick electrode 201 is disposed.

FIG. 10b depicts an example of a formation of slots 1002 formed within the jaws 1004. In some examples, the slots 1002 may comprise grooves cut or formed in the electrically conductive portion of the jaws 1004. In some examples, the slots 1002 may be sized to snugly fit a stick electrode 201. In some examples, the slots 1002 may be formed in one or both jaws 1004. In some examples, an operator 110 may use the different slots 1002 to place the stick electrode 201 in an orientation that is more convenient and/or comfortable for that particular operator 110 and/or for a particular welding position (e.g., overhead, flat, vertical, etc.).

In the example of FIG. 10b, there are four slots 1002. Slot 1002aa and slot 1002ab are depicted as generally horizontal and/or perpendicular to the handle 1008. Slot 1002aa and slot 1002ab are also depicted as parallel to one another. In the example of FIG. 10b, slot 1002b and slot 1002c are depicted as diagonal and/or crisscrossing in an “X” configuration between slot 1002aa and slot 1002ab. The dotted lines in FIG. 10a depict how the electrode 201 might be oriented relative to the handle 1008 (and/or sensor module 200) when held in (and/or extending from) one of the slots 1002.

While four slots 1002 are shown in the example of FIG. 10b, in some examples the clamp-type electrode holder 1006 may have more or fewer slots 1002. While four slots 1002 are shown in the example of FIG. 10b, eight sets of dotted lines are shown in the example of FIG. 10a. Twice the number of dotted lines are depicted in FIG. 10a as number of slots 1002 depicted in FIG. 10b to indicate that an electrode 201 held in one slot 1002 of the clamp-type electrode holder 1006 may extend from two different (e.g., opposite) sides of the jaws 1004 of the clamp-type electrode holder 1006. In some examples, when the tool orientation vector 504 is being calibrated (e.g., at block 402), the operator 110 may provide an indication (e.g., via the monitoring UI 314 and/or module I/O devices 204) as to what side of the clamp-type electrode holder 1006 the electrode 201 is extending. In some examples, different slots 1002 may instead be provided to accommodate extension of the electrode 201 from different sides of the jaws 1004.

FIGS. 12a-12c show examples of a twist-type stick welding torch 1200. As shown, the twist-type stick welding torch 1200 includes a stick electrode 201 and a twist-type electrode holder 1206 that holds the stick electrode 201. Like the clamp-type electrode holder 1006, the twist-type electrode holder 1206 includes a sensor module 200 attached to a cylindrical handle 1208.

Also like the clamp-type electrode holder 1006, the handle 1208 of the twist-type electrode holder 1206 may comprise an inner portion made of an electrically conductive material (e.g., metal). In some examples, the handle 1208 may further comprise an outer portion made of an electrically insulating material (e.g., rubber). In some examples, the handle 1208 may include an opening configured to receive and/or connect to conductors of the welding cable 124, such that electrical current may be conducted through the welding cable 124 and/or handle 1008 to the stick electrode 201.

Unlike the clamp-type electrode holder 1006, the handle 1208 of the twist-type electrode holder 1206 is shown connected to an electrode holding head 1202 in the examples of FIGS. 12a-12c (rather than electrode holding jaws 1004 like the clamp-type electrode holder 1006). As shown, the holding head 1202 includes a hole 1210 in which the stick electrode 201 is inserted. In some examples, the hole 1210 leads to a channel within the holding head 1202 where clamping features of the holding head 1202 clamp down on the stick electrode 201 to hold the stick electrode 201 in the holding head 1202. In some examples, the handle 1208 is rotatable, and rotating (or twisting) the handle 1208 causes the clamping features within the holding head 1202 to tighten the hold on the stick electrode 201 (e.g., by narrowing the channel) or release/relax the hold on the stick electrode 201 (e.g., by widening the channel), depending on the direction of rotation.

In the example of FIGS. 12a-12c, the holding head 1202 is pivotally connected to the handle 1208, such that the holding head 1202 can pivot between several (e.g., 3, 4, 5, etc.) discrete pivotal positions. FIGS. 12a-12c show the holding head 1202 of the twist-type stick electrode holder 1206 in three different pivotal positions, resulting in the stick electrode 201 (held by the holding head 1202) being in three different orientations relative to the handle 1208 (and/or sensor module 200). Thus, while the stick electrode 201 may always be at the same orientation relative to the holding head 1202 (unless bent), the orientation of the stick electrode 201 relative to the handle 1208 (and/or sensor module 200) may be changed by changing the pivotal position of the holding head 1202. In some examples, an operator 110 may use the different pivotal positions to place the stick electrode 201 in an orientation that is more convenient and/or comfortable for that particular operator 110 and/or for a particular welding position (e.g., overhead, flat, vertical, etc.). While three pivotal positions are shown in the examples of FIGS. 12a-12c, in some examples the holding head 1202 may have more or fewer discrete pivotal positions.

FIGS. 11a-11c show the clamp-type stick welding torch 1000 with the stick electrode 201 disposed in different slots 1002 (but always extending from the left side of the clamp-type electrode holder 1006). In FIG. 11a, the stick electrode 201 is held in slot 1002aa, with the clamp-type electrode holder 1006 oriented approximately horizontal, such that the sensor module 200 and jaws 1004 are in approximate horizontal alignment. In FIG. 11b, the stick electrode 201 is held in slot 1002b, with the clamp-type electrode holder 1006 angled such that the jaws 1004 are shown above the sensor module 200. In FIG. 11c, the stick electrode 201 is held in slot 1002c, with the clamp-type electrode holder 1006 angled such that the jaws 1004 are shown below the sensor module 200.

FIGS. 12a-12c show the twist-type stick welding torch 1200 with the electrode holding head 1202 in different pivotal positions. In FIG. 12a, the holding head 1202 is in a first pivotal position, with the head 1202 oriented perpendicular to the handle 1208 such that the sensor module 200 is in approximate horizontal alignment with an intersection point of the handle 1208 and holding head 1202. In FIG. 12b, the holding head 1202 is in a second pivotal position, with the head 1202 oriented at a downward angle with respect to the handle 1208, such that holding head 1202 and handle 1208 form an acute angle proximate the electrode 201. In FIG. 12b, the holding head 1202 is in a third pivotal position, with the head 1202 oriented at an upward angle with respect to the handle 1208, such that the holding head 1202 and handle 1208 form an obtuse angle proximate the electrode 201.

In each of FIGS. 11a-12c the stick electrode 201 is pointing downwards in a direction parallel to gravity, such as might occur when the processing circuitry records the tool orientation vector 504 (e.g., as parallel to gravity). Also in each of the examples of FIGS. 11a-12c, the stick electrode 201 is held (e.g., pointing downwards in a direction parallel to gravity) by a calibration block 1100. In some examples, the calibration block 110 may be similar (or identical) to the calibration block 506, save for having a smaller hole to snugly fit and secure the stick electrode 201 (which is smaller than the nozzle 299). In some examples, some other mechanism (e.g., clamp, stand, fixture, fasteners, etc.) may be used to secure the electrode 201 (e.g., similar to that discussed above).

In each of the examples of FIGS. 11a-12c, a sensor reference frame 502 is shown at an orientation corresponding to an orientation sensor module 200 (e.g., as might be perceived by the sensor module). Tool orientation vectors 504 are also shown relative to the sensor reference frame 502 of the sensor module 200 to illustrate an example of what might be recorded by the processing circuitry at block 402 (e.g., when an input is provided indicating the electrode 201 is in a known orientation). In the examples of FIGS. 11a and 12a, the tool orientation vector 504a corresponds to the orientation of the electrode 201 when the electrode 201 is held in the slot 1002aa (e.g., extending from the left side of the clamp-type electrode holder 1006), or when the head 1202 is at the first pivotal position, and the electrode 201 is in the known orientation (e.g., parallel to gravity).

While tool orientation vectors 504a, 504b, and 504c are shown in the examples of FIGS. 11a-11c, in some examples, the processing circuitry may record them as tool orientation vectors 504a₁, 504b₁, and 504c₁. In some examples, the “1” subscript may indicate that the orientation vectors 504 correspond to the electrode 201 extending from a first (e.g., left) side of the jaws 1004 (and/or clamp-type electrode holder 1006). In some examples, tool orientation vectors 504₂corresponding to the electrode 201 extending from a second (e.g., right) side of the jaws 1004 (and/or clamp-type electrode holder 1006) may be separately recorded.

In some examples, tool orientation vectors 504₂, corresponding to the electrode 201 extending from a second (e.g., right) side of the jaws 1004 (and/or clamp-type electrode holder 1006), may be automatically determined and/or recorded. For example, the tool orientation vectors 504₂may be automatically determined and/or recorded as being parallel to, and/or opposite of, the direction of the recorded tool orientation vectors 504₁(and/or vice versa). In some examples, a tool orientation vector 504ab (corresponding to slot 1002ab) may automatically be determined and/or recorded to be the same as, opposite of, and/or parallel to tool orientation vector 504a.

In some examples, each recorded tool orientation vector 504 may be associated with a particular slot 1002, side, and/or pivotal position in memory (e.g., based on input from the operator 110 when recording that identifies the relevant slot 1002, side, and/or pivotal position). In some examples, the clamp-type electrode holder 1006 and/or twist-type electrode holder 1206 may have identifying markings corresponding to each slot 1002, side, and/or pivotal position. In some examples, the operator 110 may use the markings on the clamp-type electrode holder 1006 and/or twist-type electrode holder 1206 when selecting the particular slot 1002, side, and/or pivotal position.

In the examples of FIGS. 11b and 12b, the tool orientation vector 504b corresponds to the orientation of the electrode 201 when the electrode 201 is held in the slot 1002b, or when the head 1202 is at the second pivotal position, and the electrode 201 is in the known orientation. In the examples of FIGS. 11b and 12, both the sensor reference frame 502 and the tool orientation vector 504a have also been rotated to a different orientation relative to their orientation in FIGS. 11a and 12a. This change in orientation corresponds to both the difference in orientation between the slots 1002aa and 1002b (or first/second pivotal positions) and the change in orientation experienced by the sensor module 200 due to the different slots 1002 and/or pivotal positions. Both tool orientation vectors 504a and 504b are shown in FIGS. 11b and 12b to illustrate the recordation (and/or calibration) of two different tool orientation vectors 504 corresponding to two different slots 1002 and/or pivotal positions.

In the examples of 11c and 12c, three tool orientation vectors 504a, 504b, 504c are shown as having been recorded. The tool orientation vector 504c corresponds to the orientation of the electrode 201 when the electrode 201 is held in the slot 1002c, or when the head 1202 is at the third pivotal position, and the electrode 201 is in the known orientation. As shown, the sensor reference frame 502 and the tool orientation vectors 504a and 504b have also been rotated to a different orientation due to the change in orientation of the sensor module 200.

While FIGS. 11a-12c show each tool orientation vector 504 being separately recorded, in some examples, after recording one tool orientation vector 504, the processing circuitry may automatically determine and/or record the remaining possible tool orientation vectors 504. For example, the memory may store models of different clamp-type stick welding torches 1000 (and/or different twist-type stick welding torches 1200), with each model including information regarding the relative orientations and/or angular offsets of the available slots 1002 (and/or pivotal positions) for that particular clamp-type stick welding torch 1000 (and/or twist-type stick welding torch 1200). In such an example, an operator 110 may identify (e.g., via the monitoring UI 314 and/or module I/O devices 204) the particular clamp-type stick welding torch 1000 and/or twist-type stick welding torch 1200 being used, and record the tool orientation vector 504 for one of the slots 1002 and/or pivotal positions. Once the processing circuitry records that one tool orientation vector 504, the processing circuitry may automatically determine and/or record the remaining possible tool orientation vectors 504 using the one recorded tool orientation vector 504 and the model information for that particular clamp-type stick welding torch 1000 (and/or twist-type stick welding torch 1200). This may save the operator 110 from having to spend time recording each different tool orientation vector 504 for each corresponding slot 1002 and/or pivotal position at block 402 of the technique monitoring process 400.

In the example of FIG. 4, after block 402, the technique monitoring process 400 proceeds to block 404 where the processing circuitry prompts the operator 110 to select an orientation of the joint 120 (e.g., horizontal or vertical). In some examples, joint orientation information (in addition to tool orientation information) is needed to determine certain welding technique parameters. For example, both an orientation of the welding-type tool 102 and an orientation of the joint 120 is required to determine travel angle. As another example, both the orientation of the welding-type tool 102 and an orientation of a base plate workpiece 122 (or a vector perpendicular to the base plate workpiece 122) is needed to determine work angle. Thus, the technique monitoring process 400 seeks joint orientation information from the operator 110 at block 404. In some examples, the operator 110 may be prompted to select an orientation of the joint 120, and/or respond to the prompt(s), using the monitoring UI 314 and/or module I/O devices 204.

In some examples, the processing circuitry may assume the orientation of the joint 120 corresponds to a default joint orientation, unless/until an operator 110 selects a different orientation. For example, the memory may store a default joint orientation that the processing circuitry accesses at block 404 (or 402) and uses as the “selected” orientation of the joint 120, unless/until an operator 110 selects a different orientation (e.g., in response to the prompt(s) discussed above). In some examples, the default joint orientation may be a horizontal orientation, since horizontal orientations are more common than vertical.

In some examples, the processing circuitry assumes that the joint and/or base plate is oriented parallel or perpendicular to the direction of acceleration due to gravity (which is often the case in practice). In some examples, the processing circuitry further assumes that the joint is a linear (as opposed to curved) joint. Such assumptions allow for accurate determination of joint orientation and base plate orientation (and/or orientation of a vector perpendicular to the base plate) with minimal additional calibrations (which is important since operators 110 sometimes either forget, or are reluctant, to spend time doing calibrations). Thus, in some examples, the processing circuitry may only offer the option to select a vertical or horizontal joint.

In the example of FIG. 4, after block 404, the technique monitoring process 400 proceeds to block 406 where the processing circuitry decides to either proceed to block 408 or block 410, depending on whether the joint orientation selected at block 404 is vertical or horizontal. Where the selected joint orientation is vertical, the technique monitoring process 400 proceeds to block 408. At block 408, the processing circuitry determines that the joint is in a 3G or 3F joint position (those being the only two joint positions possible for vertical joints). Where the selected joint orientation is horizontal the technique monitoring process 400 instead proceeds from block 406 to block 410, where the processing circuitry seeks additional information to determine the joint position.

At block 410, the processing circuitry determines a horizontal joint position of the joint 120. In some examples, the determination may be based on input from the operator 110 (e.g., via monitoring UI 314 and/or module I/O devices 204). In some examples, the processing circuitry may use data received from the sensor module 200 to determine the horizontal joint position.

In some examples, the processing circuitry may use data from the sensor module 200 to identify the real time orientation of the welding-type tool 102 in relation to gravity, and use that relative orientation to determine the horizontal joint position. For example, the processing circuitry may determine the acceleration due to (and/or direction of) gravity relative to the current reference frame 502 of the sensor module 200 using the accelerometer(s) of the IMU 206 of the sensor module 200. The processing circuitry may further identify the orientation of the welding-type tool 102 relative to the current reference frame 502 of the sensor module 200 using the recorded tool orientation vector 504. Thereafter, the processing circuitry can determine an angle between the tool orientation vector 504 and a gravity vector 602 corresponding to the measured direction of the acceleration of gravity (see, e.g., FIG. 6). In some examples, different horizontal joint positions may correspond to different angles between the tool orientation vector 504 and the gravity vector 602, and the processing circuitry may thereby automatically determine the horizontal joint position using the determined angle.

FIG. 6 is a diagram showing example angles that might occur between the tool orientation vector 504 and the gravity vector 602, and how those angles might correspond to different horizontal joint positions. In the example of FIG. 6, examples of joints 120 for two main types of welds (fillet and groove) are shown in different welding positions. In particular, six different example horizontal joint positions are shown: 1G, 2G, 2F, 4F-A, 4F-B, and 4G. The joint 120 is shown going into the page at all six positions. However, the orientation of the base plate workpiece 122a, and/or the orientation of a vector 604 extending perpendicular to the base plate workpiece 122a, varies. As the base plate perpendicular vector 604 is needed to determine certain welding technique parameters (i.e., work angle), it can be important for the technique monitoring process 400 to establish the particular horizontal position of the joint 120.

In the example of FIG. 6, the 1G, 2G, and 4G joint positions correspond to groove weld joints 120 between two workpieces 122 (e.g., butt joints). The 1G joint position is a groove weld in a flat position. The 2G joint position is a groove weld in a horizontal position. The 4G joint position is a groove weld in an overhead position. In some examples, either workpiece 122 may be considered the base plate workpiece 122 for the 1G, 2G, and 4G joint positions.

In the example of FIG. 6, the 2F, 4F-A, and 4F-B joints positions correspond to fillet weld joints 120 between two workpieces 122 (e.g., T joints). The 4F-A joint position is a fillet weld in a first overhead position. The 4F-B joint position is a fillet weld in a second overhead position. The 2F joint position is a fillet weld in a horizontal position. In some examples, the workpiece 122a is the base plate workpiece 122a for the 2F, 4F-A, and 4F-B joints positions.

In the example of FIG. 6, the base plate perpendicular vector 604 is the same (i.e., straight up, parallel to the direction of gravity) for both the 1G and 2F joint positions. Likewise, the base plate perpendicular vector 604 would be the same (i.e., straight down, parallel to the direction of gravity) for both the 4G and 4F-A joints positions. The base plate perpendicular vector 604 would be the same for both the 2G and 4F-B joint positions (i.e., horizontal, perpendicular to the direction of gravity in a plane containing both the gravity vector 602 and tool orientation vector 504). In some examples, for the 2G and 4F-B joint positions, a base plate perpendicular vector 604 that is parallel to gravity may still be used to determine the relevant welding technique parameter(s) (e.g., travel angle), and simply modified (e.g., via addition/subtraction) by ninety degrees to account for the difference.

In the example of FIGS. 6, a 22.5-67.5 degree angle between the gravity vector 602 and tool orientation vector 504 corresponds to the 1G and/or 2F position (and/or the corresponding base plate perpendicular vector 604). As shown, a 67.5-112.5 degree angle between the gravity vector 602 and tool orientation vector 504 corresponds to the 2G and/or 4F-B position (and/or the corresponding base plate perpendicular vector 604). A 112.5-157.5 degree angle between the gravity vector 602 and tool orientation vector 504 is shown corresponding to the 4G and/or 4F-A position (and/or the corresponding base plate perpendicular vector 604).

In some examples, the processing circuitry may be unable to automatically determine the horizontal joint position. For example, where the angle between the gravity vector 602 and tool orientation vector 504 is too small (or too large), the resulting cross product between the two vectors may become highly uncertain, and/or very small variations in measurement (e.g., noise) may have a significantly amplified impact on the cross product, such that the processing circuitry may be unable (or decline) to automatically determine the horizontal joint position based on the angle. In the example of FIG. 6, this situation is depicted where the angle is 0-22.5 degrees and/or 157.5-180 degrees. In some examples, the processing circuitry may provide a notification (e.g., via the monitoring UI 314 and/or Module I/O devices 204) informing the operator 110 if the horizontal position could not be automatically detected. In some examples, the processing circuitry may repeat block 410 of the technique monitoring process 400 if unable to automatically determine the horizontal joint position.

In the example of FIG. 4, after block 408 and/or block 410, the technique monitoring process 400 proceeds to block 412 where the processing circuitry determines a first joint characteristic vector. In some examples, the first joint characteristic vector may be determined based on data from the sensor module 200 as well as the joint position identified at block 408 or block 410.

In some examples, the first joint characteristic vector may be a joint orientation vector 606 (see, e.g., FIG. 6). For example, where the joint position is a (e.g., 3F or 3G) vertical joint position (e.g., identified at block 408; see, e.g., FIG. 6), the processing circuitry may determine that the joint orientation vector 606 is parallel to (and/or the same as) the gravity vector 602. In some examples, the first joint characteristic vector may be a base plate perpendicular vector 604. For example, where the joint position is a (e.g., 1G, 2G, 2F, 4F-A, 4F-B, or 4G) horizontal joint position (e.g., identified at block 410), the processing circuitry may determine the base plate perpendicular vector 604 automatically (e.g., based on angle) or based on user selection, as discussed above. This is possible because, again, certain assumptions are made based on common welding practices, to simplify the calibration process of the technique monitoring process 400.

In some examples, the processing circuitry may be able to determine either the joint orientation vector 606 or the base plate perpendicular vector 604 at block 412, but not both. Nevertheless, being able to determine only one or the other may still allow the processing circuitry to determine some real time welding technique parameter values, and/or provide some feedback to the operator 110, which can be valuable.

In the example of FIG. 4, after block 412 the technique monitoring process 400 proceeds to block 414 where the processing circuitry tracks the orientation and/or movement of the welding-type tool 102 using data from the sensor module 200, identifies one or more welding technique parameters, and/or provides appropriate feedback. In some examples, the rotational orientation of the welding-type tool 102 may be tracked in real time using the sensor reference frame 502, tool orientation vector 504, and IMU 206, as discussed above. In some examples, the linear movements (e.g., speed and direction) of the welding-type tool 102 may also be tracked by analyzing linear acceleration measurements of the accelerometer(s) of the IMU 206. In some examples, movement of the welding-type tool 102 in a plane defined by the joint orientation vector 606 and a base plate surface vector 802 (e.g., perpendicular to both the joint orientation vector 606 and base plate perpendicular vector 604; see, e.g., FIGS. 8a-9b) may be analyzed to determine weave pattern characteristics (e.g., frequency, weave width, dwell time, etc.).

In some examples, movement in a direction parallel to the joint orientation vector 606 may be assumed to be in a correct direction. Thus, in some examples, if the joint orientation vector 606 is known, speed of movement in a direction parallel to the joint orientation vector 606 may be considered travel speed. In some examples, a separate calibration procedure may be used to inform the processing circuitry of the correct travel direction. For example, the tool orientation vector 504 may be oriented along the correct direction of travel and an input provided (e.g., via the monitoring UI 314 and/or module I/O devices 204). As another example, the welding-type tool 102 may be moved in the correct direction during an identified calibration time duration (e.g., while a calibration input is held down, or pressed at start/end). As another example, a simple input may be provided (e.g., via the monitoring UI 314 and/or module I/O devices 204) indicating that the travel direction is up, down, left, or right (e.g., from the perspective of the operator 110).

In some examples, real time welding technique parameters may be determined at block 414 based on the tracked orientation(s) and/or movement(s) of the welding-type tool 102. For example, where the joint orientation vector 606 is known, travel angle can be determined. In some examples, travel angle may be defined as the angle of the welding-type tool 102 with respect to a direction that a welding-type operation progresses (e.g., where a perpendicular angle is a zero degree travel angle). Thus, in some examples, the technique monitoring process 400 may determine the travel angle based on the angle between the joint orientation vector 606 and the tool orientation vector 504 (and/or 90 degrees minus this angle).

As another example, where the base plate perpendicular vector 604 is known, work angle can be determined. In some examples, work angle may be defined as the angle between a line perpendicular to the major workpiece (e.g., base plate workpiece 122a) and a plane determined by the electrode axis (e.g., tool orientation vector 504) and the weld axis (e.g., joint orientation vector 606). Thus, in some examples, the technique monitoring process 400 may determine the work angle based on the base plate perpendicular vector 604 and the tool orientation vector 504 (e.g., where the tool orientation vector 504 is assumed to be the relevant line on the plane). In examples where travel angle is determined, the technique monitoring process 400 may use the travel direction in conjunction with travel angle to determine whether welding-type operation is a push or drag operation (e.g., based on whether tool orientation vector 504 and travel direction are in the same, or a different, direction). In some examples, a positive travel angle may be considered a push, while a negative travel angle is considered a drag.

In some examples, the processing circuitry may further provide real time feedback at block 414. In some examples, the real time feedback may be provided to the operator 110 via the monitoring UI 314 and/or module I/O devices 204. In some examples, the feedback may be in the form of one or more text messages, images, videos, sounds, vibrations, and/or appropriate outputs. In some examples, the feedback may identify one or more of the welding technique parameter values and/or weave pattern characteristics determined at block 414. In some examples, the feedback may identify one or more welding, sensor, and/or operation parameter values.

In some examples, the feedback may be with respect to that particular instantaneous moment in time, and/or with respect to a given time period. In some examples, the processing circuitry may compare the determined parameter values (and/or weave pattern characteristic values) to expected and/or target welding technique parameter (and/or weave pattern characteristic) values, and/or provide feedback regarding the comparison. In some examples, the technique monitoring process 400 might provide different feedback (e.g., red vs. green colors, chime vs. alarm sounds, etc.) depending on whether the determined values are within, or outside of, a threshold range of the expected/target values. In some examples, the processing circuitry may further determine one or more ratings, grades, and/or scores based on the comparison of the determined values to the expected/target values, and provide feedback with respect thereto.

In some examples, the processing circuitry may further record in memory and/or transmit (e.g., to a remote server) parameter/characteristic values, and/or relative feedback. For example, the processing circuitry may send the information to the welding equipment 106. In some examples, the welding equipment 106 may use the information to adjust welding parameters. In some examples, the processing circuitry may disable the welding equipment 106, send a message to a supervisor, lock the workpiece(s) 122 (e.g., via a clamp or fixture), and/or take other appropriate action in response to a technique grade, rating, and/or score below a threshold (e.g., stored in memory).

In some examples, the processing circuitry may further track when a (e.g., live or simulated) welding-type operation is occurring (e.g., via measurements of the current sensor 208, communication with the welding helmet 104, and/or communication with welding equipment 106) and use this information when determining parameter/characteristic values. For example, the processing circuitry may only determine technique data and/or weave pattern characteristics when a welding-type operation is occurring. As another example, the processing circuitry may only provide feedback and/or determine a grade, rating, and/or score when an actual (or simulated) welding-type operation is occurring. As another example, the processing circuitry may record and/or output information about whether the welding-type operation is occurring when recording and/or outputting the technique data and/or weave pattern characteristics (and/or associated feedback).

In some examples, the processing circuitry may be able to continuously provide real time determination and feedback of at least some welding parameter values at block 414. In the example of FIG. 4, if there is no repositioning of, and/or changes to, the sensor module 200 (e.g., at block 418) and/or joint 120 (e.g., block 420), the technique monitoring process 400 may loop back to block 414 and the processing circuitry may continue to provide feedback as to at least some welding parameter values. While there are some drawbacks and limitations, there is still value in being able to provide feedback with only the minimal and simple calibrations of blocks 402 and 404, without requiring more from the operator 110 (who may forget and/or be reluctant to do so).

However, there may be some drawbacks and/or limitations. For example, being able to determine either the joint orientation vector 606 and base plate perpendicular vector 604 at block 412, but not both, may result in only being able to determine (and/or provide feedback with respect to) either the travel angle or work angle at block 414, but not both. Furthermore, while the travel angle or work angle may be estimated with some degree of accuracy at block 414 (e.g., using some assumptions), more precise travel angle or work angle calculations may require both the joint orientation vector 606 and the base plate perpendicular vector 604. For example, precise calculations of travel angle and/or work angle may rely on both an angle between the tool orientation vector 504 and the joint orientation vector 606, and an angle between the tool orientation vector 504 and the base plate perpendicular vector 604 (e.g., applied to certain trigonometric functions). Additionally, in some examples, the real time automatic determination of horizontal joint position at block 410 may rely on the operator 110 continuously holding the welding-type tool 102 within a range of particular angles (e.g., as discussed with respect to block 410 and FIG. 6) which, while ideal for the envisioned joint positions, may not occur in practice.

As another example, the determinations at block 414 of the technique monitoring process 400 may become increasingly unreliable as conditions deviate from ideal circumstances. For example, in the absence of a second joint characteristic vector, the determination of weld angle and/or travel angle may become increasingly unreliable as the tool orientation vector 504 deviates farther from a perpendicular relationship with the joint orientation vector 606 (for horizontal joint positons) or base plate surface vector 802 (for vertical joint positions). This can be an issue for the horizontal joint positions, or for the 3G vertical joint position, if the operator 110 deviates from common and/or ideal orientations of the welding-type tool 102. Additionally, it makes determination of travel angle (and/or work angle) very difficult for the 3F vertical joint position, because a perpendicular position is blocked by the secondary workpiece 122b, and the common and/or ideal orientations of the welding-type tool 102 for such a position is far from perpendicular.

Some of the above noted drawbacks and/or limitations may be alleviated through further calibration outlined by the technique monitoring process 400 at blocks 416 and 422. In the example of FIG. 4, after block 414, the technique monitoring process 400 proceeds to block 416, where the processing circuitry determines whether a calibration selection has been received. In some examples, the processing circuitry may prompt the operator 110 for such a calibration selection (e.g., via the monitoring UI 314 and/or module I/O devices 204). In some examples, the calibration selection at block 416 may indicate that the welding-type tool 102 is oriented properly for calibration.

In some examples, a proper orientation of the welding-type tool 102 may be where the electrode 201 is pointed towards the joint 120 at a ninety degree angle with respect to the joint 120 (and/or joint orientation vector 606) or the base plate workpiece 122a (and/or base plate surface vector 802), depending on whether the joint 120 is in a horizontal joint position or vertical joint position, respectively. In some examples, the prompt may indicate the proper orientation. In some examples, the processing circuitry may record in memory the instantaneous values (and/or representations) of the reference frame 502, gravity vector 602, and tool orientation vector 504 in response to the calibration selection. As shown, after a calibration selection at block 416, the technique monitoring process 400 proceeds to block 422.

In the example of FIG. 4, the processing circuitry determines a second joint characteristic vector at block 422. In some examples, the second joint characteristic vector may be whichever of the joint orientation vector 606 or base plate perpendicular vector 604 was not determined as the first joint characteristic vector at block 412. In some examples, the processing circuitry may further lock in the first joint characteristic, rather than leaving it variable and/or subject to the real-time determinations of the tool orientation vector 504 and gravity vector 602 (e.g., as may occur when automatically determining horizontal joint positions in block 410).

In some examples, the second joint characteristic vector may be determined based on the tool orientation vector 504 and the first joint characteristic vector (and/or the gravity vector 602). For example, for a horizontal joint position where the first joint characteristic vector is the base plate perpendicular vector 604, the processing circuitry may determine the joint orientation vector 606 to be the cross product (and/or a vector perpendicular to both) of the tool orientation vector 504 and the base plate perpendicular vector 604 (and/or the gravity vector 602). As another example, for a vertical joint position where the first joint characteristic vector is the joint orientation vector 606, the processing circuitry may determine the base plate surface vector 802 to be the cross product (and/or a vector perpendicular to both) of the tool orientation vector 504 and the joint orientation vector 606 (and/or the gravity vector 602). Thereafter, the processing circuitry may determine the base plate perpendicular vector 604 to be the cross product (and/or a vector perpendicular to both) of the base plate surface vector 802 and the joint orientation vector 606. In some examples, the processing circuitry may negate (and/or take the opposite of) a vector direction resulting from a cross product, depending on the math conventions being used.

In the example of FIG. 4, after block 422, the technique monitoring process 400 proceeds to block 424 where the processing circuitry tracks the orientation and/or movement of the welding-type tool 102 using data from the sensor module 200, identifies one or more welding technique parameters, and/or provides appropriate feedback, similar to block 414. In some examples, the tracking of the welding-type tool 102 and/or feedback of block 424 may be similar (or identical) to that of block 414. However, in some examples, the technique monitoring process 400 may be able to determine more (and/or more precise) welding technique parameter values at block 424 than at block 414 due to the availability of both the joint orientation vector 606 and base plate perpendicular vector 604 for all joint positions. In some examples, such availability may enable the technique monitoring process 400 to determine and/or provide feedback for both work angle and travel angle values, rather than just one or the other, as at block 414. Additionally, the reliability of the information is increased, and limitations reduced.

In the example of FIG. 4, the processing circuitry may continue the tracking, technique parameter calculations, and/or feedback of block 424 unless or until there is a change in the sensor module 200 (e.g., block 418) and/or the joint 120 (e.g., block 420). As shown, in the absence of such a change, the technique monitoring process 400 returns to block 406, where the processing circuitry may determine the same information still applies, eventually leading the technique monitoring process 400 back to block 424. Though not shown, in some examples, the technique monitoring process 400 may be terminated at any time by appropriate input from the operator 110.

In the example of FIG. 4, at block 418, the processing circuitry checks to see if there has been a change in the sensor module 200 that warrants recalibration. In some examples, such a change may be determined to occur if there has been more than a threshold amount drift of one or more of the sensors of the IMU 206. In some examples where multiple IMUs 206 are used, such a change may be determined to occur if there has been more than a threshold amount drift of one or more sensors of more than a threshold number of the IMUs 206. In some examples, a change warranting recalibration may be determined to occur if more than a threshold amount of time has passed since the sensor module 200 was set and/or reset at block 402 (or joint calibration performed at blocks 404 and/or 416), which might be correlated with substantial drift. As shown, the technique monitoring process 400 proceeds to block 419 after block 418.

In the example of FIG. 4, the processing circuitry checks whether a different (e.g., previously recorded) tool orientation vector 504 should be identified as the active tool orientation vector 504 at block 419. In some examples, the check of block 419 may only occur when the welding-type tool 110 is a clamp-type stick welding torch 1000 or twist-type stick welding torch 1200. While shown as occurring after block 418, in some examples, block 419 may occur at any time during the technique monitoring process 400 (e.g., via an interrupt).

In some examples, the technique monitoring process 400 may rely on the operator 110 to indicate (e.g., via the monitoring UI 314 and/or module I/O devices 204) whether a different (e.g., previously recorded) tool orientation vector 504 should be identified as the active tool orientation vector 504 at block 419. For example, if the operator 110 decides to use a different slot 1002 (and/or side) of the clamp-type stick electrode holder 1006 to hold the stick electrode 201, or a different pivotal position of the holding head 1202 of the twist-type electrode holder 1206, the operator 110 may indicate (e.g., via the monitoring UI 314 and/or module I/O devices 204) that they are changing slots 1002, sides, and/or pivotal positions. In the example of FIG. 4, the technique monitoring process 400 proceeds to block 421 after block 419 if the processing circuitry determines that a different (e.g., previously recorded) tool orientation vector 504 should be identified as the active tool orientation vector 504.

In the example of FIG. 4, the processing circuitry identifies a different (e.g., previously recorded) tool orientation vector 504 as the active tool orientation vector 504 at block 421. In some examples, the identification may be in response to an input. In some examples, the identification may be in response to a user input.

For example, the operator 110 may provide an input (e.g., via the monitoring UI 314 and/or module I/O devices 204) indicating that they are (or will be) using a particular slot 1002, side, and/or pivotal position for a welding-type operation. In such an example, the processing circuitry may identify the slot 1002, side, and/or pivotal position associated with the input, and identify the tool orientation vector 504 associated with the slot 1002, side, and/or pivotal position as the active tool orientation vector 504.

As another example, the operator 110 may provide an input indicating that the active tool orientation vector 504 should be identified based on on which recorded tool orientation vectors 504 is closest to the gravity vector 602. In such an example, the operator 110 may provide the input while the electrode 201 is in the slot 1002 (and/or on the side) the operator 110 plans to use, or the holding head 1202 is at the pivotal position the operator plans 110 to use, and the welding-type tool 102 is oriented with the electrode 201 relatively parallel to gravity (e.g., pointing downwards). Thereafter, the processing circuitry may compare the recorded tool orientation vectors 504 with the gravity vector 602, and identify as active the tool orientation vector 504 (and/or associated slot 1002, side, and/or pivotal position) that is closest to being parallel (and/or aligned with) with the gravity vector 602.

In some examples, the input may be received from a sensor (e.g., an optical sensor) of the welding-type tool 102 that is in communication with the sensor module 200 and/or monitoring device. In some examples, the sensor may be configured to detect in which slot 1002 the stick electrode 201 is positioned, or at what angle the holding head 1202 is pivotally positioned, such as described, for example, in U.S. patent application Ser. No. 15/211,743, filed Jul. 15, 2016, entitled “Stick Welding Electrode Holder System and Methods,” the entire contents of which are hereby incorporated by reference.

In some examples, the processing circuitry may identify the appropriate tool orientation vector 504 for use as the active tool orientation vector 504 based on what is expected for a particular joint position. For example, where the joint position is determined to be a 1G, 2F, 4G, or 4F-A horizontal position, the processing circuitry may identify the appropriate tool orientation vector 504 based on an expected angle the tool orientation vector 504 will form with the gravity vector 602. As discussed above with respect to FIG. 6, the angle the tool orientation vector 504 forms with the gravity vector 602 will typically fall within a particular range for each of the 1G, 2F, 4G, or 4F-A horizontal positions. In some examples, the processing circuitry may use the expected angle range to identify the appropriate tool orientation vector 504. In some examples where the operator indicates a particular slot 1002, the processing circuitry may identify which of the two recorded tool orientation vectors 504₁/504₂for that slot 1002 is most appropriate based on the expected angle range for the identified joint position. In some examples, the operator 110 may manually indicate (e.g., via the monitoring UI 314 and/or module I/O devices 204) the joint position to facilitate this process.

In some examples, the processing circuitry may identify the tool orientation vector 504 as active by associating the active tool orientation vector 504 (and/or associated slot 1002 or pivotal position) in memory with a tag, label, or other information identifying the tool orientation vector 504 as active. In some examples, the processing circuitry may use the active tool orientation vector 504 (and/or associated slot 1002, side, and/or pivotal position) in the operations of the technique monitoring process 400 until block 421 again occurs. As shown, the technique monitoring process 400 proceeds to block 420 after block 421. The technique monitoring process 400 also proceeds to block 420 after block 419 if the processing circuitry determines that the currently active tool orientation vector 504 should continue to be identified as the active tool orientation vector 504 at block 419

In the example of FIG. 4, the processing circuitry checks whether there has been a significant enough change in the joint 120 to warrant recalibration at block 420. In some examples, the technique monitoring process 400 may rely on the operator 110 to provide this information (e.g., via the monitoring UI 314 and/or module I/O devices 204). For example, if the operator 110 finishes one welding-type operation, and is set to begin a different welding-type operation with one or more different workpieces 122 and/or one or more different joints 120, then the operator 110 may provide an input to let the processing circuitry know that the prior joint calibrations are no longer applicable. In such an example, the technique monitoring process 400 would begin again at block 404. However, if, for example, the operator 110 is continuing with the same welding-type operation, or even starting a new welding-type operation where the joint 120 is in the same position and oriented the same way as the previous welding-type operation, then the technique monitoring process 400 may continue with no additional calibrations necessary.

FIGS. 7a-7b show examples of graphical user interfaces (GUIs) 700 that might be shown during the technique monitoring process 400 via the display screen(s) of the module I/O devices 204 and/or monitoring UI 314. In FIGS. 7a-7b, the GUIs 700 have input buttons 702 by which an operator 110 might select the orientation of the joint 120 (e.g., at block 404). As shown, the input button 702a is highlighted to show that the horizontal joint orientation has been selected.

In the examples of FIGS. 7a-7b, the GUIs 700 are additionally shown as including a joint position indicator 704. In the GUI 700a shown in FIG. 7a, the joint position indicator 704 indicates that the 1G/2F joint position has been automatically detected (e.g., via block 410). In the GUI 700b shown in FIG. 7b, the joint position indicator 704 indicates that the 1G/2F joint position has been locked in via calibration (e.g., via block 416 and/or 422). The joint position indicators 704 in both GUIs 700 further show a depiction of example workpieces in a 1G and 2F joint position.

In the example of FIGS. 7a-7b, the GUIs 700 show a calibration status message 706 next to a calibration button 708. In the GUI 700a of FIG. 7a, the calibration status message 706 indicates that full calibration has not yet been achieved. This correlates with the joint position indicator 704 in GUI 700a which indicates that the joint position has only been detected, rather than locked in via calibration. The calibration button 708 next to the calibration status message 706 provides a means through which an operator 110 could provide an input to induce full calibration (e.g., at block 416).

In the GUI 700b of FIG. 7b, the calibration status message 706 indicates that the welding technique monitoring system 300 has been fully calibrated to be able to recognize both joint characteristic vectors. This correlates with the joint position indicator 704 in GUI 700b, which indicates that the joint position has been locked in during calibration, rather than just instantaneously detected at the current point in time. The calibration button 708 next to the calibration status message 706 provides an input through which an operator 110 could clear the current calibration, such as if, for example, the operator 110 was starting a new welding-type operation with a different joint position (e.g., block 420).

While not shown, in some examples, the calibration status message 706 might also indicate a threshold amount of time had passed since calibration, indicate a time until such a threshold would pass, and/or indicate a confidence level of the feedback given the time since calibration (e.g., due to drift of the IMU 206). In some examples, the calibration button 708 may be unavailable as a means through which an operator 110 could provide an input to induce calibration (e.g., at block 416), such as for example, if the angle formed by the tool orientation vector 504 and the gravity vector 602 is too extreme. In some examples where the calibration button 708 is unavailable, the calibration button 708 may be grayed out and/or include a notification indicating why the calibration button 708 is unavailable.

In the examples of FIGS. 7a-7b, each GUI 700 provides two feedback outputs 710. In the GUI 700a shown in FIG. 7a, the feedback output 710a shows the current work angle estimated by the technique monitoring process 400. While the feedback output 710b of GUI 700b corresponds to the current travel angle estimated by the technique monitoring process 400, the feedback output 710b is shown grayed out with a prohibition symbol to indicate that the technique monitoring process 400 cannot provide feedback for this technique parameter (e.g., because the technique monitoring process 400 has not been fully calibrated). In some examples, the feedback output 710a might instead be grayed out were the vertical joint position indicator 704b instead selected.

In the GUI 700b shown in FIG. 7b, both feedback outputs 710 show values detected (rather than estimated) during the technique monitoring process 400, as made possible by full calibration during the technique monitoring process 400. Additionally, the feedback output 710b provides feedback that the welding-type operation is a push (rather than pull) operation.

While described as feedback outputs 710, in some examples, the feedback outputs 710 may alternatively, or additionally, be means through which input can be provided. For example, selection of the feedback outputs 710 may change the format of the feedback being output (e.g., from numerical, to chart/graph, to numerical and chart/graph, etc.). While only travel angle and weld angle are shown in the feedback outputs 710, in some examples other parameter values (and/or weave pattern characteristic values) may be shown.

FIGS. 8a-9b show examples of how the aforementioned vectors might correspond to a vertical groove welding joint 120a between two workpieces 122, and/or a horizontal fillet welding joint 120b between two workpieces 122. In the example of FIGS. 8a-8b, the welding-type tool 102 is operating on a 3G vertical groove butt joint 120a between two workpieces 122. In the example of FIGS. 9a-9b, the welding-type tool 102 is operating on a 2F horizontal fillet T joint 120b between two workpieces 122. In FIGS. 8a-9b, a tool orientation vector 504, gravity vector 602, joint orientation vector 606, base plate surface vector 802, and base plate perpendicular vector 604 is shown adjacent the workpieces 122.

In the examples of FIGS. 8a-8b, the joint orientation vector 606 is parallel to the joint 120a and the direction of gravity. In some examples, the parallel relationship between the joint orientation vector 606 and direction of gravity makes it easy to identify the joint orientation vector 606 for vertically oriented joints. As shown, the base plate surface vector 802 is perpendicular to the joint orientation vector 606. The base plate surface vector 802 is also perpendicular to the tool orientation vector 504 and the base plate perpendicular vector 604. These latter relationships are somewhat easier to see in FIG. 8b, which shows a top down view.

In the examples of FIGS. 9a-9b, the base plate perpendicular vector 604 is parallel to the direction of gravity. In some examples, this relationship makes it easy to identify the base plate perpendicular vector 604 for horizontally oriented joints; although, in some horizontal joint examples (e.g., 2G/4F-B), the base plate perpendicular vector 604 may instead be perpendicular to the direction of gravity (see, e.g., FIG. 6). As shown, the joint orientation vector 606 is parallel to the joint 120b, as well as perpendicular to the base plate perpendicular vector 604 and the tool orientation vector 504. These relationship between the joint orientation vector 606 and tool orientation vector 504 are somewhat easier to see in FIG. 9b, which shows a top down view. While also shown in the examples of FIGS. 9a-9b, in some examples, the base plate surface vector 802 may be less important for horizontal joints, where the base plate perpendicular vector 604 can be determined from the gravity vector 602. In some examples, the base plate surface vector 802 may be more important for vertical joints, where the base plate surface vector 802 is needed to determine the base plate perpendicular vector 604. In any case, the relationships between the vectors allow for the simple and intuitive calibration techniques described above.

The example tool based welding technique monitoring system 300 provides an inexpensive, robust, and portable solution for tracking an orientation of a welding-type tool 102, and providing feedback as to welding technique. The system 300 requires no sensors apart from a simple and/or relatively inexpensive sensor module 200 that can travel with the welding-type tool 102. The system 300 can also provide some feedback with only minimal calibration, allowing for value to be provided even where an operator 110 forgets, or is unwilling to take the time to fully calibrate the system 300. Additionally, full calibration of the system 300 can be accomplished with a fast, simple, intuitive calibration technique.

The present methods and/or systems may be realized in hardware, software, or a combination of hardware and software. The present methods and/or systems may be realized in a centralized fashion in at least one computing system, or in a distributed fashion where different elements are spread across several interconnected computing or cloud systems. Any kind of computing system or other apparatus adapted for carrying out the methods described herein is suited. A typical combination of hardware and software may be a general-purpose computing system with a program or other code that, when being loaded and executed, controls the computing system such that it carries out the methods described herein. Another typical implementation may comprise an application specific integrated circuit or chip. Some implementations may comprise a non-transitory machine-readable (e.g., computer readable) medium (e.g., FLASH drive, optical disk, magnetic storage disk, or the like) having stored thereon one or more lines of code executable by a machine, thereby causing the machine to perform processes as described herein.

While the present method and/or system has been described with reference to certain implementations, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present method and/or system. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from its scope. Therefore, it is intended that the present method and/or system not be limited to the particular implementations disclosed, but that the present method and/or system will include all implementations falling within the scope of the appended claims.