JP2016013562A - Welding system, communication method for welding system and relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding system that enables a remote control device using radio communication to perform communication with a welding power supply device as accurately as possible.SOLUTION: In a welding system A1 including a welding power supply device 1, a wire feeding device 2 and a remote control device 3 for performing communication with the wire feeding device 2, electric power transmission wires 51, 52 for supplying electric power to drive a feeding motor 24 from the welding power supply device 1 to the wire feeding device 2 are provided so as to enable the welding power supply device 1 and the wire feeding device 2 to perform communication with each other via the electric power transmission wires 51, 52. Since the remote control device 3 is located near the wire feeding device 2, this arrangement prevents failure of the radio communication. Even if the wire feeding device 2 and the welding power supply device 1 are located distantly, communication failure is hard to occur because it is a wired communication. Accordingly, compared to a case where the remote control device 3 directly performs radio communication with the welding power supply device 1, this system prevents communication failure and thus enables accurate communication.

Description

  The present invention relates to a welding system that operates a welding power source device with a remote control device, a communication method for the welding system, and a relay device.

  The consumable electrode type welding system is usually separated into a welding power source device that is not moved due to its weight and a wire feeding device that is carried by a welding operator when the welding location is changed. When the welding power supply is installed at a location away from the position where the welding operation is performed, it is efficient for the operator to go to the location where the welding power supply is installed in order to set welding conditions such as welding voltage. bad. In order to solve this problem, a device that changes welding conditions using a remote control device that performs wireless communication with a welding power source device has been developed (see Patent Document 1).

Japanese Patent No. 3414193

  In welding sites for large structures such as shipbuilding and bridges, the welding power source and the welding location are often several tens of meters apart. In such a welding site, when a welding operator sets welding conditions for a welding power supply device using a wireless remote control device near the welding point, the remote operation device and the welding power supply device are separated by a partition wall or the like. May cause trouble in wireless communication.

  In addition, since a plurality of welding systems are used in such a welding site, signals transmitted and received by other welding systems may interfere with each other, noise may be mixed, and the wireless communication may be disturbed. .

  FIG. 11 shows a state where wireless communication is performed between the remote control device 300 and the welding power source device 100 of the conventional welding system A100. The welding power supply device 100 is disposed at a position away from the non-workpiece W, and the welding operator carries the welding work by carrying the wire feeding device 200 near the workpiece W. A welding operator has a remote control device 300 in order to remotely control the welding power source device 100. In the figure, when welding work is performed on the workpiece W located at a position separated from the welding power source device 100 by the partition wall B, the welding operator operates the remote control device 300 to set the welding conditions. It shows the state. A signal for setting the welding conditions is transmitted from the communication unit 360 of the remote operation device 300. However, because of the partition wall B, the transmitted signal may not be correctly received by the communication unit 140 of the welding power source apparatus 100. Moreover, since the remote control device 300 and the welding power source device 100 are separated from each other, a transmission signal of another welding system in between may be received, or noise generated from other devices in between may be mixed. is there.

  When a failure occurs in wireless communication, it is impossible to communicate welding conditions, or even if communication is possible, it is impossible to accurately communicate welding condition values. When such a communication failure occurs, the welding conditions set by the remote operation device 300 are not accurately communicated to the welding power source device 100, so that welding becomes unstable and the welding quality deteriorates.

  The present invention has been conceived under the circumstances described above, and provides a welding system in which a remote control device using wireless communication can communicate with a welding power source device as accurately as possible. Is the purpose.

  In order to solve the above problems, the present invention takes the following technical means.

  A welding system provided by the first aspect of the present invention includes a welding power supply device, a wire feeding device, a welding torch, and power for supplying welding power from the welding power supply device to the welding torch. Provided on the power transmission line, a cable, a power transmission line for supplying power to drive the feeding motor of the wire feeding device from the welding power source device to the wire feeding device A relay device and a remote control device that performs wireless communication with the relay device are provided, and the welding power supply device and the relay device communicate with each other via the power transmission line.

  In a preferred embodiment of the present invention, the relay device is included in the wire feeding device.

  In a preferred embodiment of the present invention, the welding power source device performs wireless communication with the remote control device, and the signal directly received from the remote control device by wireless communication, the relay device, and the power Comparing means for comparing a signal received via a transmission line, and processing means for performing processing based on the signal only when the comparing means determines that the two signals are the same. .

  In a preferred embodiment of the present invention, the welding power supply device further includes a retransmission request means for requesting the remote control device to retransmit a signal when the comparison means determines that the two signals are different. I have.

  In a preferred embodiment of the present invention, the welding power supply device further includes a counting unit that counts the number of times the comparison unit performs comparison, and the processing unit has a predetermined number that is counted by the counting unit. Is exceeded, processing is performed based on signals received via the relay device and the power transmission line.

  In a preferred embodiment of the present invention, the processing means performs processing based on a signal received via the relay device and a power transmission line when the comparing means determines that the two signals are different. .

  In a preferred embodiment of the present invention, the welding power source device includes a first communication means for receiving a welding condition setting signal for setting a welding condition, and a welding condition setting signal received by the first communication means. Based on the first storage control means for changing the welding condition parameter stored in the first storage means and the welding condition parameter stored in the first storage means, the output of the welding power supply device is controlled. Output control means for transmitting the welding condition parameter stored in the first storage means as a welding condition parameter signal, and the remote control device is based on an operation by a welding operator. A second storage control means for changing the welding conditions stored in the second storage means, and a table for displaying based on the welding conditions stored in the second storage means Means, second welding means for transmitting the welding condition stored in the second storage means as a welding condition signal, and receiving the welding condition parameter signal transmitted by the first communication means, and the second communication means. The third storage means for storing the welding condition parameter based on the received welding condition parameter signal, the welding condition stored in the second storage means and the welding condition parameter stored in the third storage means are compared. And determining means for determining whether or not they match, and notifying means for performing notification based on a determination result by the determining means.

  In a preferred embodiment of the present invention, the remote control device is a portable terminal.

  In a preferred embodiment of the present invention, the welding system further includes a gas pipe that supplies a shielding gas to the welding torch via the welding power supply device and the wire feeding device, and the power transmission line includes: It is arrange | positioned inside the said gas piping.

  The relay device provided by the second aspect of the present invention is provided on a power transmission line for supplying electric power for driving a feeding motor included in the wire feeding device from the welding power source device to the wire feeding device. Provided, wirelessly communicating with a remote control device for remotely operating the welding power supply device, and communicating with the welding power supply device via the power transmission line.

  The communication method provided by the third aspect of the present invention includes a welding power source device, a wire feeding device, a welding torch, and a power for supplying welding power from the welding power source device to the welding torch. Provided on the power transmission line, a cable, a power transmission line for supplying power to drive the feeding motor of the wire feeding device from the welding power source device to the wire feeding device A welding method communication method comprising a relay device and a remote control device that performs wireless communication with the relay device, wherein the remote control device transmits a communication signal wirelessly; The relay device receives a communication signal transmitted from the remote control device, and the relay device transmits the received communication signal to the welding power supply device via the power transmission line. 3 of a step, the welding power supply device, characterized in that it comprises a fourth step of receiving a communication signal transmitted through the power transmission line.

  According to the present invention, the remote control device and the wire feeding device perform wireless communication, and the wire feeding device and the welding power source device perform wired communication via the power transmission line. Since the remote control device is located near the wire feeding device, there is little possibility that a partition wall or other welding system exists between them, and it is difficult for a failure to occur in wireless communication. Further, even if the wire feeding device and the welding power source device are separated from each other, the communication is difficult to occur because the communication is wired. Therefore, compared to the case where the remote control device directly performs wireless communication with the welding power source device, communication is less likely to occur and communication can be performed accurately.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a figure for demonstrating the whole structure of the welding system which concerns on 1st Embodiment. It is an example of the internal structure of the power supply part for welding and the power supply part for feeders. It is an example of the external view of a remote control device. It is a flowchart for demonstrating the determination process which the control part of a remote control device performs. It is a figure for demonstrating the whole structure of the welding system which concerns on 2nd Embodiment. It is a flowchart for demonstrating the comparison process which the control part of a welding power supply device performs. It is a flowchart for demonstrating the other Example of a comparison process. It is a figure for demonstrating the whole structure of the welding system which concerns on 3rd Embodiment. It is a figure for demonstrating the welding system which concerns on 4th Embodiment. It is a figure for demonstrating the other Example of the welding system which concerns on 4th Embodiment. It is a figure which shows the state which is performing wireless communication between the remote control apparatus of the conventional welding system, and the welding power supply device.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a diagram for explaining the overall configuration of a welding system A1 according to the first embodiment, and FIG. 2 shows an example of the internal configuration of a welding power source 10 and a feeder power source 11. It is.

  As shown in FIG. 1, the welding system A <b> 1 includes a welding power supply device 1, a wire feeding device 2, a remote control device 3, power cables 41 and 42, power transmission lines 51 and 52, and a welding torch 6. . One output terminal a for welding power of the welding power source device 1 is connected to the wire feeding device 2 via a power cable 41. The wire feeding device 2 sends the wire electrode to the welding torch 6 so that the tip of the wire electrode protrudes from the tip of the welding torch 6. In the contact tip disposed at the tip of the welding torch 6, the power cable 41 and the wire electrode are electrically connected. The other output terminal b for welding power of the welding power source apparatus 1 is connected to the workpiece W via the power cable 42. The welding power source device 1 generates an arc between the tip of the wire electrode protruding from the tip of the welding torch 6 and the workpiece W, and supplies electric power to the arc. The welding system A1 welds the workpiece W with the heat of the arc.

  Electric power for driving a feeding motor 24 (described later) for feeding the wire electrode is supplied from the welding power supply device 1 to the wire feeding device 2 via power transmission lines 51 and 52. As the power transmission lines 51 and 52, durable cables (for example, two-core cabtire cables) with two parallel wires and a thick coating are used. In order to improve noise resistance, a shielded cable may be used. Further, the power transmission lines 51 and 52 may be coaxial cables or the like. The welding system A1 actually includes a wire reel around which a wire electrode is wound, a gas cylinder of a shielding gas for discharging from the welding torch 6, and the like and illustration are omitted. .

  The welding power source device 1 supplies DC power for arc welding to the welding torch 6. The welding power supply device 1 includes a welding power supply unit 10, a feeding device power supply unit 11, a storage unit 12, a control unit 13, and a communication unit 14.

  The welding power supply unit 10 converts three-phase AC power input from the power system into DC power suitable for arc welding and outputs the DC power. As shown in FIG. 2A, the three-phase AC power input to the welding power supply unit 10 is converted into DC power by the rectifier circuit 101 and converted into AC power by the inverter circuit 102. Then, the voltage is stepped down (or stepped up) by the transformer 103, converted into DC power by the rectifier circuit 104, and output. In addition, the structure of the power supply part 10 for welding is not limited to what was mentioned above.

  The power supply unit 11 for the feeding device outputs power for driving the feeding motor 24 of the wire feeding device 2 and the like. The power supply unit 11 for the feeding device converts single-phase AC power input from the power system into DC power suitable for use in the wire feeding device 2 and outputs it. The power supply unit 11 for the feeding device is a so-called switching regulator, and as shown in FIG. 2A, the AC power input to the power supply unit 11 for the feeding device is converted into DC power by the rectifier circuit 111, The voltage is stepped down (or boosted) by the DC / DC converter circuit 112 and output. The power supply unit 11 for a feeding device supplies DC power whose voltage is controlled to 48 V, for example, to the wire feeding device 2 via the power transmission lines 51 and 52. In addition, the structure of the power supply part 11 for feeders is not limited to what was mentioned above. For example, the configuration may be the same as the welding power supply unit 10, and AC power input from the power system is stepped down (or boosted) by a transformer, and then converted to DC power by the rectifier circuit 111 and output. You may do it.

  The storage unit 12 stores a welding condition parameter Wp such as a setting voltage for setting a welding voltage output from the welding power supply device 1 and a setting current for setting a welding current output from the welding power supply device 1. Is.

  The control unit 13 controls the welding power source device 1 and is realized by, for example, a microcomputer. The control unit 13 controls the inverter circuit 102 of the welding power source unit 10 so that the welding voltage and welding current output from the welding power source device 1 become the set voltage and set current stored in the storage unit 12. Further, the DC / DC converter circuit 112 of the feeding device power supply unit 11 is controlled so that the voltage output from the feeding device power supply unit 11 becomes a predetermined voltage. Further, control such as changing the welding condition parameter Wp stored in the storage unit 12 in response to an operation of a setting button (not shown) or starting the welding power supply unit 10 in response to an operation of an activation button (not shown). I do. Moreover, the control part 13 displays the detection value of the welding voltage and welding current detected by the sensor which is not illustrated on a display part which is not illustrated, or when an abnormality occurs, the control part 13 notifies the notification part which is not illustrated.

  Also, the control unit 13 changes the welding condition parameter Wp and starts the welding power source unit 10 based on the signal input from the communication unit 14, and detects the detected value of the detected welding voltage or welding current, A signal indicating the occurrence of an abnormality and a signal for a wire feed command to the wire feeder 2 are output to the communication unit 14. In addition, the control unit 13 reads out the welding condition parameter Wp stored in the storage unit 12 and outputs the welding condition parameter Wp to the communication unit 14 for each preset transmission cycle. In the present embodiment, the transmission cycle is set in a range of about 10 to 500 ms.

  The communication unit 14 is for performing communication with the wire feeding device 2 via the power transmission lines 51 and 52. The communication unit 14 demodulates the signal received from the wire feeding device 2 and outputs the demodulated signal to the control unit 13. The signal received from the wire feeder 2 includes, for example, a welding condition setting signal for changing the welding condition parameter Wp stored in the storage unit 12, an activation signal for instructing activation of the welding power source unit 10, and the like. is there. Moreover, the communication part 14 modulates the signal input from the control part 13, and transmits to the wire feeder 2 as a communication signal. In order to transmit, for example, a detected value of the detected welding voltage or welding current, a signal indicating the occurrence of abnormality, or a welding condition parameter Wp stored in the storage unit 12 to the communication signal transmitted to the wire feeding device 2. There is a welding condition parameter signal, a signal for a wire feed command, and the like. In addition, the communication signal transmitted / received between the wire feeding apparatuses 2 is not limited to the above.

  The communication unit 14 performs communication using a direct sequence spread spectrum (DSSS) communication method. In the direct spread spectrum communication method, the transmission side performs an operation using a spread code on a signal to be transmitted, and spreads the spectrum of the original signal in a wider band and transmits the signal. The receiving side restores the original signal by despreading the received signal using a common spreading code. Even when noise is superimposed on the communication signal, the noise spectrum is spread by despreading, so that the original communication signal can be extracted by filtering. Moreover, if a different spreading code is used for each welding system A1, even if a communication signal transmitted / received in another welding system A1 is erroneously received, the communication signal is despread with a different spreading code, and as noise Removed. Therefore, communication can be performed with high communication quality.

  The communication unit 14 includes a coupling circuit. The coupling circuit includes a high-frequency transformer in which a coil connected to the input / output terminal of the communication unit 14 and a coil connected in parallel to the power transmission lines 51 and 52 are magnetically coupled, and the communication unit 14 outputs. The communication signal is superimposed on the power transmission lines 51 and 52, and the communication signal superimposed on the power transmission lines 51 and 52 is detected. The communication unit 14 performs BPSK (Binary Phase Shift Keying) modulation on the carrier signal in accordance with the signal input from the control unit 13, performs spectrum spread on the modulated signal, converts the signal into an analog signal, and transmits the analog signal. Note that the modulation method is not limited to BPSK modulation, and ASK modulation or FSK modulation may be performed. Further, the spread spectrum is not limited to the direct spreading method, and a frequency hopping method may be used. In this embodiment, the spectrum spread is performed. However, the present invention is not limited to this, and the spectrum spread may not be performed. In addition, the communication unit 14 detects communication signals superimposed on the power transmission lines 51 and 52, converts the communication signals into digital signals, performs despreading and filtering, performs demodulation, and outputs the signals to the control unit 13. The communication signal transmitted from the welding power supply device 1 to the wire feeding device 2 and the communication signal transmitted from the wire feeding device 2 to the welding power supply device 1 are transmitted and received at different times. Different frequency bands may be used.

  The wire feeding device 2 feeds the wire electrode to the welding torch 6. The wire feeding device 2 also has a function of relaying communication between the welding power source device 1 and the remote control device 3. The wire feeding device 2 includes a power supply unit 21, a control unit 22, a relay unit 23, and a feeding motor 24. The wire feeding device 2 includes a gas electromagnetic valve for supplying the shielding gas from the gas cylinder to the welding torch 6 and the like, but illustration and explanation are omitted.

  The power supply unit 21 supplies power to the control unit 22 and the feed motor 24. The power supply unit 21 is supplied with electric power from the welding power supply device 1 through the power transmission lines 51 and 52, converts the voltage into a voltage suitable for each of the control unit 22 and the feeding motor 24, and outputs the converted voltage. The power supply unit 21 outputs a capacitor for accumulating power supplied from the welding power supply device 1, a diode for preventing a current from flowing backward from the capacitor to the power transmission lines 51 and 52, the control unit 22, and the feed motor 24. A DC / DC converter for adjusting the voltage is provided. Note that the configuration of the power supply unit 21 is not limited to that described above.

  The control unit 22 controls the wire feeding device 2 and is realized by, for example, a microcomputer. The control unit 22 relays an activation signal for activating the welding power source unit 10 of the welding power source device 1 in response to an activation operation signal input from a torch switch (not shown) provided in the welding torch 6. To the unit 23. The control unit 22 rotates the feed motor 24 and rotates a feed roller (not shown) while the wire feed command is input from the relay unit 23 to feed the wire electrode.

  The relay unit 23 is for performing wired communication with the welding power supply device 1 via the power transmission lines 51 and 52. In addition, the relay unit 23 performs wireless communication with the remote control device 3. The relay unit 23 also has a function of relaying communication between the welding power supply device 1 and the remote control device 3.

  The relay unit 23 demodulates the communication signal received from the welding power supply device 1. When the demodulated signal is a signal for a wire feed command or the like, the signal is output to the control unit 22. On the other hand, if the demodulated signal is a detected value of welding voltage or welding current, a signal indicating the occurrence of abnormality, a welding condition parameter signal, or the like, it is modulated again and transmitted to the remote control device 3 as an electromagnetic wave by the antenna 23a.

  Further, the relay unit 23 receives the electromagnetic wave output from the remote operation device 3 by the antenna 23 a, amplifies the received signal, and transmits the amplified signal to the welding power source device 1. Note that the received signal may be transmitted as it is without being amplified, or the received signal may be demodulated once, subjected to predetermined processing, and then modulated and transmitted again. Moreover, the relay part 23 modulates the starting signal etc. which are input from the control part 22, and transmits to the welding power supply device 1. FIG. In addition, the communication signal transmitted / received between the relay part 23, the welding power supply device 1, and the remote control device 3 is not limited to what was mentioned above. Similar to the communication unit 14, the relay unit 23 also performs communication using the direct spread spectrum communication method.

  The relay unit 23 includes a coupling circuit. The coupling circuit includes a high-frequency transformer in which a coil connected in parallel to the power transmission lines 51 and 52 and a coil connected to the input / output terminal of the relay unit 23 are magnetically coupled, and communication output from the relay unit 23. The signal is superimposed on the power transmission lines 51 and 52, and the communication signal superimposed on the power transmission lines 51 and 52 is detected.

  The feed motor 24 feeds the wire electrode to the welding torch 6. The feed motor 24 rotates based on a wire feed command from the control unit 22, rotates the feed roller, and sends the wire electrode to the welding torch 6.

  The remote control device 3 is for operating the welding power source device 1 from a remote position. The remote control device 3 changes the welding condition parameter Wp of the welding power source device 1. Further, the detected value of the welding voltage or welding current detected by the welding power supply device 1 is displayed, or an abnormality occurring in the welding power supply device 1 is notified. The remote operation device 3 includes an operation unit 31, a storage unit 32, a display unit 33, a notification unit 34, a control unit 35, and a communication unit 36.

  The operation unit 31 outputs an operation button operation by a welding operator to the control unit 35 as an operation signal.

  FIG. 3 is an example of an external view of the remote control device 3. As shown in the figure, a welding current setting button 31a, a welding voltage setting button 31b, and a switching button 31c are arranged as operation buttons in the operation unit 31 of the remote control device 3. The welding current setting button 31a is for changing the setting current of the welding current output from the welding power source device 1. The welding voltage setting button 31b is for changing the setting voltage of the welding voltage output from the welding power source device 1. When the welding current setting button 31 a or the welding voltage setting button 31 b is operated, the operation unit 31 outputs an operation signal for changing welding conditions to the control unit 35. The switch button 31 c is for switching the display mode of the display unit 33. Each time the switching button 31 c is pressed, the operation unit 31 outputs an operation signal for switching the display mode to the control unit 35. Although other operation buttons are also arranged on the operation unit 31, they are omitted in the figure. Details of the operation of each operation button will be described later.

  Returning to FIG. 1, the storage unit 32 stores the welding condition Wr set by operating the operation button of the operation unit 31. The storage unit 32 also stores a welding condition parameter Wp received as a welding condition parameter signal from the welding power supply device 1. The storage unit 32 stores the welding condition Wr and the welding condition parameter Wp in respective determined storage areas.

  The display unit 33 performs various displays and is realized by, for example, a liquid crystal display device (see FIG. 3). The display unit 33 is controlled by the control unit 35, displays the welding condition Wr stored in the storage unit 32, and also displays the result of determination processing described later. Moreover, the display of the detected value of the welding voltage detected by the welding power supply device 1 or welding current is also performed. The display unit 33 may be a simple display device such as a 7-segment display.

  The notification unit 34 performs predetermined notification, and is realized by, for example, a speaker (see FIG. 3). The notification unit 34 is controlled by the control unit 35 and notifies the abnormality of the welding power source device 1 with a warning sound. In addition, the result of determination processing described later is also notified. In addition, the alerting | reporting part 34 is not limited to what alert | reports with a sound. For example, the notification may be performed by vibration, or the display unit 33 may be notified by characters or images.

  The control unit 35 controls the remote operation device 3 and is realized by, for example, a microcomputer. In accordance with an operation signal for switching the display mode input from the operation unit 31, the control unit 35 displays a display content of the display unit 33, a mode for displaying the welding condition Wr stored in the storage unit 32, and welding. It switches with the mode which displays the detected value of the welding voltage detected with the power supply device 1, and a welding current. Further, the welding condition Wr stored in the storage unit 32 is changed according to an operation signal for changing the welding condition Wr input from the operation unit 31.

  Further, the control unit 35 reads out the welding condition Wr stored in the storage unit 32 and outputs it to the communication unit 36 and the display unit 33 for each preset transmission cycle. In the present embodiment, the transmission cycle is set in a range of about 10 to 500 ms. The transmission cycle set in the control unit 35 may be the same as or different from the transmission cycle set in the control unit 13 of the welding power source device 1. Further, regardless of the transmission cycle, when the welding condition Wr stored in the storage unit 32 is changed, the changed welding condition Wr may be output. Alternatively, the welding condition Wr may be output when the welding power supply unit 10 of the welding power supply device 1 is activated.

  Further, the control unit 35 outputs the detected value of the welding voltage or welding current input from the communication unit 36 to the display unit 33 or based on a signal indicating the occurrence of an abnormality input from the communication unit 36. 34 is notified of abnormality.

  Further, the control unit 35 performs a determination process for determining whether or not the welding condition Wr set by the remote operation device 3 is correctly communicated to the welding power source device 1.

  FIG. 4 is a flowchart for explaining the determination process performed by the control unit 35. The determination process is executed at every predetermined timing.

  As described above, the welding power source device 1 transmits the welding condition parameter signal to the remote control device 3 for each transmission cycle, and the storage unit 32 stores the welding condition parameter signal as the welding condition parameter Wp. First, the welding condition parameter Wp memorize | stored in the memory | storage part 32 is acquired (S1). The storage unit 32 also stores a welding condition Wr set by the remote operation device 3. The welding condition Wr stored in the storage unit 32 is acquired (S2).

  Next, it is determined whether or not the welding condition parameter Wp matches the welding condition Wr (S3). When the elements (set voltage, set current, etc.) of the welding condition parameter Wp all match the corresponding elements of the welding condition Wr, it is determined that the welding condition parameter Wp matches the welding condition Wr. The welding condition parameter Wp is set in the welding power source device 1 based on the welding condition Wr set by the remote operation device 3. If communication is correctly performed between the remote control device 3 and the welding power source device 1, the welding condition parameter Wp and the welding condition Wr match. When the welding condition parameter Wp and the welding condition Wr match (S3: YES), communication is correctly performed, and the welding condition Wr set by the remote operation device 3 is correctly applied to the welding power source device 1 as the welding condition parameter Wp. It is determined that it is set, a coincidence signal (for example, a low level signal) is output to the notification unit 34 (S4), and the determination process ends.

  On the other hand, when the welding condition parameter Wp and the welding condition Wr do not match (S3: NO), communication is not correctly performed, and the welding condition Wr set by the remote operation device 3 is correctly set in the welding power source device 1. It is determined that it is not, a mismatch signal (for example, a high level signal) is output to the notification unit 34 (S5), and the determination process ends.

  The notification unit 34 does not notify when a coincidence signal (low level signal) is input, but when a disagreement signal (high level signal) is input, the notification unit 34 notifies, for example, by a sound of “pea”. I do. Thereby, the welding worker can notice that communication is not performed correctly. In this case, since welding may become unstable and welding quality may deteriorate, the welding operator waits for the communication state to improve without starting the welding operation. In the present embodiment, the result of the determination process is also output to the display unit 33. The display unit 33 displays “x” in the communication status column when a mismatch signal (high level signal) is input, and displays in the communication status column when a match signal (eg, low level signal) is input. “◯” is displayed (see FIG. 3).

  Note that the flowchart of the determination process is not limited to that shown in FIG. For example, the process proceeds to step S5 only when the determination of NO in step S3 continues for a predetermined number of times (for example, 10 times) or more, and proceeds to step S4 if the determination of NO does not continue for a predetermined number of times or more. Also good. Further, only when the determination of NO in step S3 continues for a predetermined time (for example, 1 second) or longer, the process proceeds to step S5, and when the determination of NO does not continue for a predetermined time or longer, the process proceeds to step S4. Also good. In the middle of setting the welding conditions by the welding operator, there may be a moment when Wp and Wr do not match due to a time delay due to communication. Even in the case of this momentary disagreement, it is confusing if the notification is made, so the determination is made by determining NO continuously for a predetermined number of times (or a predetermined time).

  The communication unit 36 is for performing wireless communication with the wire feeding device 2. The communication unit 36 demodulates the signal received from the wire feeding device 2 and outputs the demodulated signal to the control unit 35. The signal received from the wire feeding device 2 includes, for example, a detected value of the welding voltage or welding current detected by a sensor in the welding power supply device 1, a signal indicating the occurrence of an abnormality, and the welding conditions stored in the storage unit 12. There is a welding condition parameter signal transmitted based on the parameter Wp. The communication unit 36 modulates a signal input from the control unit 35 and transmits the modulated signal to the wire feeding device 2. The signal transmitted to the wire feeding device 2 includes, for example, a welding condition setting signal for transmitting the welding condition Wr stored in the storage unit 32. In addition, the signal transmitted / received between the welding power supply apparatuses 1 is not limited to what was mentioned above.

  The communication unit 36 transmits and receives communication signals via the antenna 36a. The communication unit 36 performs BPSK (Binary Phase Shift Keying) modulation on the carrier signal in accordance with the signal input from the control unit 35, performs spectrum spread on the modulated signal, converts it to an analog signal, and transmits it as an electromagnetic wave. Note that the modulation method is not limited to BPSK modulation, and ASK modulation or FSK modulation may be performed. Further, the spread spectrum is not limited to the direct spreading method, and a frequency hopping method may be used. In this embodiment, the spectrum spread is performed. However, the present invention is not limited to this, and the spectrum spread may not be performed. The communication unit 36 converts the electromagnetic wave received by the antenna 36 a into a digital signal, performs despreading and filtering, performs demodulation, and outputs the demodulated signal to the control unit 35. Note that a signal transmitted from the remote operation device 3 to the wire feeding device 2 and a signal transmitted from the wire feeding device 2 to the remote operation device 3 are transmitted and received at different times. Different frequency bands may be used.

  Next, the operation of the welding system A1 will be described by taking as an example a case where the welding operator operates the remote control device 3 to set the welding condition parameter Wp of the welding power source device 1.

  The welding operator operates the operation unit 31 of the remote control device 3 to set the welding condition Wr. As shown in FIG. 3, the welding current setting button 31 a is labeled “Current”, and each time the upper part of the button is pressed, the value of the setting current increases by 1 A, and the lower part of the button is 1 Each time it is pressed, the set current value decreases by 1A. The welding voltage setting button 31b is labeled “Voltage”, and the set voltage increases by 0.1V each time the upper part of the button is pressed, and every time the lower part of the button is pressed once. The set voltage value decreases by 0.1V. The welding condition Wr stored in the storage unit 32 is changed by the operation of the operation unit 31. The welding condition Wr stored in the storage unit 32 is displayed on the display unit 33. In FIG. 3, “set current: 150 A” and “set voltage: 18.5 V”, which are part of the current welding condition Wr, are displayed. The welding operator looks at the display on the display unit 33 and operates the operation unit 31 so as to obtain a desired value. In the figure, the display of other welding conditions Wr is omitted.

  The remote control device 3 transmits the welding condition Wr stored in the storage unit 32 to the wire feeding device 2 by wireless communication as a welding condition setting signal for each transmission cycle. The wire feeding device 2 amplifies the received welding condition setting signal and transmits it to the welding power source device 1 by wired communication via the power transmission lines 51 and 52.

  The welding power supply device 1 changes the welding condition parameter Wp stored in the storage unit 12 based on the welding condition setting signal received from the wire feeding device 2. The welding power source device 1 is controlled based on the welding condition parameter Wp stored in the storage unit 12.

  In addition, the welding power source device 1 uses the welding condition parameter Wp stored in the storage unit 12 as a welding condition parameter signal for each transmission cycle to the wire feeding device 2 by wire communication via the power transmission lines 51 and 52. Send. The wire feeding device 2 transmits the received welding condition parameter signal to the remote control device 3 by wireless communication.

  The remote control device 3 changes the welding condition parameter Wp stored in the storage unit 32 based on the welding condition parameter signal received from the wire feeding device 2. Further, the remote operation device 3 performs a determination process at every predetermined timing. That is, it is determined whether or not the communication is correctly performed by determining whether or not the welding condition parameter Wp stored in the storage unit 32 matches the welding condition Wr. The remote control device 3 performs a predetermined display on the display unit 33 according to the determination result, and causes the notification unit 34 to perform a predetermined notification. In the case of FIG. 3, it is determined that communication is correctly performed, “communication state: ○” is displayed on the display unit 33, and the notification by the notification unit 34 is not performed. The welding operator can confirm that the welding condition Wr displayed on the display unit 33 is correctly set as the welding condition parameter Wp of the welding power source device 1 by displaying “communication state: ○”. If “communication state: ×” is displayed, it is determined that the welding condition parameter Wp of the welding power source apparatus 1 is set with a content different from the welding condition Wr displayed on the display unit 33. The worker can recognize.

  According to the present embodiment, the remote operation device 3 and the wire feeding device 2 perform wireless communication, and the wire feeding device 2 and the welding power source device 1 perform wired communication via the power transmission lines 51 and 52. Since the remote control device 3 is located near the wire feeding device 2, there is little possibility that a partition wall or other welding system exists between them, and it is difficult for a failure to occur in wireless communication. In addition, even if the wire feeding device 2 and the welding power source device 1 are separated from each other, since they are wired communication, it is difficult for a communication failure to occur. Therefore, as compared with the case where the remote control device 3 directly performs wireless communication with the welding power source device 1, communication is less likely to occur and communication can be performed accurately.

  In addition, the remote operation device 3 performs a determination process, and if the communication with the welding power source device 1 cannot be performed correctly, the remote operation device 3 notifies the welding operator to that effect. Therefore, when a failure occurs in communication, the welding operation can be started as it is, and it can be suppressed that welding becomes unstable and the welding quality is deteriorated.

  In addition, in this embodiment, although the case where welding conditions included the setting voltage and the setting current was demonstrated, it is not restricted to this. The welding conditions may not include any one of the set voltage and the set current. Further, the welding condition may be such that neither the set voltage nor the set current is included. For example, the welding conditions are stored in the storage unit 12 of the welding power source device 1 as a pattern in which the set voltage, the set current, and other conditions are combined, and the remote control device 3 transmits and receives only the pattern number as the welding condition. You may do it.

  In the present embodiment, using the magnetic coupling by the coil, the communication unit 14 and the relay unit 23 superimpose the communication signal on the power transmission lines 51 and 52 and detect the communication signal superimposed on the power transmission lines 51 and 52. However, the present invention is not limited to this. For example, electric field coupling by a capacitor may be used. Instead of inputting communication signals in parallel to the power transmission lines 51 and 52, communication signals may be input in series to the power transmission lines 51 or 52.

  In the present embodiment, the case where the power supply unit 11 for the feeding device supplies DC power to the power supply unit 21 has been described, but AC power may be supplied. In this case, the power supply unit 11 for the feeding device is provided with a transformer in place of the rectifier circuit 111 and the DC / DC converter circuit 112 so that the AC power input from the power system is stepped down and output by the transformer. That's fine. On the other hand, the power supply unit 21 needs to be provided with a rectifier circuit for converting AC power into DC power. Moreover, you may make it supply the alternating current power from an electric power system directly to the power supply part 21 via the power transmission lines 51 and 52, without providing the power supply part 11 for feeders in the welding power supply apparatus 1. FIG.

  In the present embodiment, the case has been described in which the welding power source unit 10 and the power supply unit 11 for the feeding device convert AC power input from the power system into DC power, respectively, and output the DC power. Absent. A part of the configuration may be shared between the welding power supply unit 10 and the power supply device power supply unit 11. For example, as shown in FIG. 2B, the output of the rectifier circuit 101 of the welding power supply unit 10 is input to the DC / DC converter circuit 112 without providing the rectifier circuit 111 in the power supply unit 11 for the feeding device. It may be. Further, a winding may be added to the secondary side of the transformer 103 of the welding power supply unit 10 to extract electric power, and the electric power may be rectified and output. A part of the output of the power supply unit 10 may be supplied to the wire feeder 2 through the power transmission lines 51 and 52.

  In the present embodiment, the case where the welding power source apparatus 1 is a DC power source that supplies DC power to the arc has been described, but the present invention is not limited thereto. For example, in order to perform welding of aluminum or the like, the welding power source device 1 may be an AC power source that supplies AC power. In this case, an inverter circuit may be added to the welding power supply unit 10 so that the DC power output from the rectifier circuit 104 is converted into AC power and output.

  In the present embodiment, the case where the welding system A1 is a consumable electrode type welding system has been described. In the case of a non-consumable electrode type welding system, a wire feeding device for feeding a wire electrode is not necessary, but a wire feeding device for automatically feeding a filler wire may be used. In this case, it becomes the structure similar to welding system A1, and this invention can be applied.

  In the said 1st Embodiment, although the welding power supply device 1 and the remote control apparatus 3 demonstrated the case where only the communication which the wire feeding apparatus 2 relays was demonstrated, it is not restricted to this. For example, the welding power supply device 1 and the remote control device 3 may directly communicate with each other. A case where direct communication is also performed will be described below as a second embodiment.

  FIG. 5 is a diagram for explaining an overall configuration of a welding system A2 according to the second embodiment. In the same figure, the same code | symbol is attached | subjected to the same or similar element as welding system A1 (refer FIG. 1) which concerns on 1st Embodiment.

  The welding system A2 shown in FIG. 5 is the first embodiment in that the welding power supply apparatus 1 ′ includes the wireless communication unit 15, and the wireless communication unit 15 directly performs wireless communication with the communication unit 36 of the remote control device 3. It differs from welding system A1 concerning.

  The wireless communication unit 15 is for performing wireless communication with the remote control device 3, and transmits and receives signals via an antenna. The communication method of the wireless communication unit 15 is common to the communication method of the communication unit 14 except that the communication method is wireless communication. The welding power supply device 1 ′ has two communication paths in communication with the remote control device 3. The wireless communication unit 15 directly transmits the same signal as the signal transmitted from the communication unit 14 to the remote operation device 3 via the relay unit 23 to the remote operation device 3 by wireless communication. The signal transmitted by the remote control device 3 is received by the communication unit 14 via the relay unit 23 and also received by the wireless communication unit 15. If the signal received by the communication unit 14 matches the signal received by the wireless communication unit 15, it can be considered that no communication failure has occurred in any communication path.

  The control unit 13 ′ compares the signal received by the communication unit 14 with the signal received by the wireless communication unit 15, and receives and processes the signal only when the two match. If they do not match, request retransmission of the signal.

  FIG. 6 is a flowchart for explaining the comparison process performed by the control unit 13 ′ of the welding power source apparatus 1 ′. The comparison process is started when the welding power supply apparatus 1 'is activated.

First, it is determined whether or not the communication unit 14 and the wireless communication unit 15 have received a signal (S11). Determination of step S11 until a signal is received is repeated, if the signal is received: the (S11 YES), signals S ₁ to the communication unit 14 has received is acquired (S12), the wireless communication unit 15 has received signal S ₂ is obtained (S13).

Next, whether or not the signals S ₁ and the signal S ₂ match is determined (S14). If they match (S14: YES), in either of the two communication paths may not communication failure occurs, the signal S ₁ and the signal S ₂ received is considered to be communicated correctly, the signal Processing according to S ₁ (or signal S ₂ ) is performed (S15), and the process returns to step S11. For example, when the signals S ₁ and S ₂ are welding condition setting signals, the welding condition parameter Wp in the storage unit 12 is changed. On the other hand, if they do not match (S14: NO), it is considered that a communication failure has occurred in one or both of the two communication paths, so that the remote control device 3 is requested to retransmit the signal ( S16), the process returns to step S11.

If the signal is received: the (S11 YES), if the match is the signals S ₁ and the signal S ₂ (S14: YES), the processing is performed (S15), the reception waiting state of the next signal (S11) become. If the signals S ₁ and the signal S ₂ match (S14: NO), and retransmission is requested (S16), it waits for a signal to be retransmitted (S11).

  According to the second embodiment, since the welding power source apparatus 1 ′ performs processing only when the signals received through the two communication paths match, the signal received when the communication failure has occurred and communication has not been performed correctly. It is possible to prevent the processing based on this.

In the case of the flowchart shown in FIG. 6, since retransmission is requested until the signal S ₁ and the signal S ₂ match, it may take time until the processing is performed. Even when the signal S ₁ and the signal S ₂ do not match, there is a case where no communication failure has occurred in any one of the communication paths. Therefore, when the comparison between the signal S ₁ and the signal S ₂ does not coincide even after a predetermined number of times, the processing is performed based on the signal of the communication path that is highly likely not to cause a communication failure. Good.

FIG. 7 is a flowchart for explaining another embodiment of the comparison process performed by the control unit 13 ′ of the welding power source apparatus 1 ′. In the flowchart shown in FIG. 7, steps S21 to S24 are added to the flowchart shown in FIG. 6, and step S15 is changed to S15 ′. Specifically, by counting the number of comparisons N (step S23), it is determined whether or not exceeded the predetermined number N ₀ (S22), if it exceeds (S22: YES), and depending on the signals S ₁ Processing is performed (S15 '). Steps S21 and S24 are steps for initializing the number N of comparisons to “1”.

If the received signals S ₁ and the signal S ₂ match (S14: NO), step S22, S16, S23, S11 to S14 is repeated, comparing number N is counted. If the comparison number N has exceeded the predetermined number N ₀ (S22: YES), the processing corresponding to the signal S ₁ is performed (S15 '), comparing the number N is initialized to "1" (S24), the following (S11).

The wireless communication unit 15 performs wireless communication with the remote operation device 3, whereas the communication unit 14 performs wired communication with the wire feeding device 2, and the wire feeding device 2 and the remote operation device 3. Wireless communication is performed at a location close to. Therefore, the signal S ₁ received by the communication unit 14 is more reliable than the signal S ₂ received by the wireless communication unit 15. Therefore, in step S15 ', and to perform the processing according to the signal S _1.

In the case of this embodiment, the reliability is lower than the case where the retransmission request is made until the signal S ₁ and the signal S ₂ match, but the time until the process is performed can be shortened. When the comparison number N exceeds the predetermined number N ₀ (S22: YES), a signal for alerting the remote control device 3 may be transmitted. If the remote control device 3 that has received the signal notifies the attention, it is possible to alert the welding operator that there is a possibility of communication failure.

As yet another embodiment, when the signal S ₁ and the signal S ₂ do not match, the process according to the signal S ₁ may be performed without requesting retransmission. The flowchart in this case is obtained by replacing step S16 with step S15 ′ in the flowchart shown in FIG. In this embodiment, the reliability is further lowered, but the time until the processing is performed can be further shortened.

  The control unit 35 of the remote operation device 3 may have the same function. That is, the control unit 35 compares the signal directly received by the communication unit 36 from the wireless communication unit 15 and the signal received by the communication unit 36 after being relayed by the relay unit 23. A signal may be received and processed, and if they do not match, a retransmission of the signal may be requested.

  In the first and second embodiments, the case where the wire feeding device 2 relays communication between the welding power source device 1 (1 ') and the remote control device 3 has been described. However, the present invention is not limited to this. For example, a relay device including a relay unit may be provided separately. A case where a relay device is provided in the middle of the power transmission lines 51 and 52 will be described below as a third embodiment.

  FIG. 8 is a diagram for explaining the overall configuration of a welding system A3 according to the third embodiment. In the same figure, the same code | symbol is attached | subjected to the same or similar element as welding system A1 (refer FIG. 1) which concerns on 1st Embodiment.

  In the welding system A3 shown in FIG. 8, the wire feeding device 2 ′ does not have a relay function for communication between the welding power source device 1 and the remote control device 3, and the relay device 7 having the relay function is configured by the power transmission line 51. , 52 is different from the welding system A1 according to the first embodiment in that it is provided in the middle.

  The wire feeding device 2 ′ includes a communication unit 23 ′ that performs only communication with the welding power source device 1 instead of the relay unit 23. The relay unit 71 of the relay device 7 relays communication between the welding power source device 1 and the remote control device 3.

  The relay unit 71 has a relay function performed by the relay unit 23 of the wire feeding device 2 according to the first embodiment. That is, like the relay unit 23 according to the first embodiment, the relay unit 71 includes a coupling circuit, and the communication signal is superimposed on the power transmission lines 51 and 52 and is superimposed on the power transmission lines 51 and 52. By detecting the communication signal, wired communication is performed with the welding power source device 1 through the power transmission lines 51 and 52. In addition, the relay unit 71 performs wireless communication with the remote control device 3 by transmitting and receiving a communication signal as an electromagnetic wave by the antenna 71a. The relay unit 71 amplifies the received signal and transmits it. Note that the received signal may be transmitted as it is without being amplified, or the received signal may be demodulated once, subjected to predetermined processing, and then modulated and transmitted again.

  The relay device 7 performs wired communication with the welding power source device 1 via the power transmission lines 51 and 52, and performs wireless communication with the remote operation device 3. Further, the relay device 7 has a relay function. The relay device 7 can be provided at any position of the power transmission lines 51 and 52, but it is preferable to provide the relay device 7 as close to the remote operation device 3 as possible so that wireless communication with the remote operation device 3 can be easily performed. Good. Note that the relay device 7 may be arranged so as to be movable on the power transmission lines 51 and 52. In the third embodiment, the same effect as that of the first embodiment can be obtained.

  In the first to third embodiments, the case where the dedicated remote control device 3 is used has been described, but the present invention is not limited to this. For example, instead of the remote operation device 3, a portable terminal such as a tablet terminal or a smartphone may be used. An application for causing the portable terminal to have the functions of the remote control device 3 is installed. The portable terminal originally has functions corresponding to the operation unit 31, the storage unit 32, the display unit 33, the notification unit 34, and the communication unit 36 of the remote operation device 3. By installing the application and causing the control unit of the portable terminal to function as the control unit 35 of the remote operation device 3, the portable terminal can be used instead of the remote operation device 3. In this case, it is not necessary to prepare the remote control device 3 separately.

  Generally, a portable terminal is provided with a plurality of communication methods (for example, WiFi (registered trademark), Bluetooth (registered trademark), LTE (Long Term Evolution), 3G, infrared communication, etc.). The relay unit 23 of the wire feeding device 2 (the relay unit 71 of the relay device 7) may also have a plurality of communication methods, and the communication method may be switched to the communication method with the best communication state. In this case, communication can be performed by an optimum method without worrying about the type of communication method.

  Although not shown in FIG. 1 and the like, the welding system A1 is provided with a gas pipe for supplying shield gas from the gas cylinder to the welding torch 6. The power transmission lines 51 and 52 may be arranged inside the gas pipe, or may be bundled with the gas pipe. A case where the power transmission lines 51 and 52 are arranged inside the gas pipe will be described below as a fourth embodiment.

  FIG. 9 is a view for explaining a welding system A4 according to the fourth embodiment. FIG. 9A shows the overall configuration of the welding system according to the fourth embodiment. In the same figure, the same code | symbol is attached | subjected to the same or similar element as welding system A1 (refer FIG. 1) which concerns on 1st Embodiment. In FIG. 9A, a part of the internal configuration of the welding power supply device 1 and the wire feeding device 2 is omitted. Further, the description of the remote control device 3 is also omitted. FIG. 9B shows a cross-sectional view of the gas pipe 9.

  A welding system A4 shown in FIG. 9 is different from the welding system A1 according to the first embodiment in that the power transmission lines 51 and 52 are arranged inside the gas pipe 9.

  The gas pipe 9 connects the gas cylinder 8 and the welding torch 6 via the welding power supply device 1 and the wire feeding device 2, and supplies the shielding gas of the gas cylinder 8 to the tip of the welding torch 6. The power transmission lines 51 and 52 are disposed inside the gas pipe 9 between the welding power supply device 1 and the wire feeding device 2. The power transmission lines 51 and 52 are drawn into the gas pipe 9 from the through holes provided in the gas pipe 9. In order to prevent gas leakage and moisture intrusion, it is necessary to seal the through hole after passing through the power transmission lines 51 and 52.

  According to the fourth embodiment, since the power transmission lines 51 and 52 are disposed inside the gas pipe 9 connecting the welding power supply device 1 and the wire feeding device 2, the power transmission lines 51 and 52 are Compared to a case where the wire feeding device 2 is moved separately from the gas pipe 9, the wire feeding device 2 is not obstructed. Moreover, since the power transmission lines 51 and 52 are surrounded by the gas pipe 9, it is difficult to receive an impact from the outside, and the power transmission lines 51 and 52 can be prevented from being disconnected.

  Note that, as in the welding system A <b> 4 ′ illustrated in FIG. 10, the power transmission line 52 may be connected to the power cable 41 so that the power cable 41 is also used as the power transmission line 52. In this case, only the power transmission line 51 needs to be disposed inside the gas pipe 9. If there is only one power transmission line arranged inside the gas pipe 9, as shown in FIG. 10 (b), the gas pipe connection fitting 1a (wire feeding device) provided in the welding power source apparatus 1 is provided. By using the gas pipe connection fitting 2a) provided in 2 as a connector, the arrangement of the power transmission line 51 can be facilitated.

  The welding system, the welding system communication method, and the relay device according to the present invention are not limited to the above-described embodiments. The specific configuration of each part of the welding system, the welding system communication method, and the relay device according to the present invention can be varied in design in various ways.

A1, A2, A3, A4 Welding system 1, 1 'Welding power supply 10 Welding power supply 11 Power supply device power supply 12 Storage unit (first storage means)
13 Control unit (first storage control means, output control means)
13 'control unit (comparison means, processing means, retransmission request means, count means, first storage control means, output control means)
14 Communication unit (first communication means)
15 Wireless communication unit 1a Gas pipe connection fitting 2, 2 'Wire feeder 21 Power supply unit 22 Control unit 23 Relay unit (relay device)
23a Antenna 23 'Communication unit 24 Feeding motor 2a Gas pipe fitting 3 Remote control device 31 Operation unit 31a Welding current setting button 31b Welding voltage setting button 31c Start button 32 Storage unit (second storage means, third storage unit) Storage means)
33 Display section (display means, notification means)
34 Notification part (notification means)
35 Control unit (second storage control means, determination means)
36 Communication unit (second communication means)
36a Antenna 41, 42 Power cable 51, 52 Power transmission line 6 Welding torch 7 Relay device 71 Relay unit 71a Antenna 8 Gas cylinder 9 Gas piping W Workpiece

Claims (11)

A welding power source,
A wire feeding device;
Welding torch,
A power cable for supplying electric power for welding from the welding power source device to the welding torch;
A power transmission line for supplying power for driving a feeding motor of the wire feeding device from the welding power source device to the wire feeding device;
A relay device provided on the power transmission line;
A remote control device for performing wireless communication with the relay device;
With
The welding power supply device and the relay device communicate via the power transmission line.
A welding system characterized by that. The relay device is included in the wire feeding device,
The welding system according to claim 1. The welding power source is
Wireless communication is performed with the remote control device,
Comparison means for comparing a signal directly received from the remote control device by wireless communication with a signal received via the relay device and a power transmission line;
Processing means for performing processing based on the signal only when the comparison means determines that the two signals are the same;
With
The welding system according to claim 1 or 2. The welding power supply device further includes a retransmission request unit that requests the remote control device to retransmit a signal when the comparison unit determines that the two signals are different.
The welding system according to claim 3. The welding power supply device further includes a counting unit that counts the number of times the comparison unit performs comparison,
The processing means performs processing based on a signal received via the relay device and a power transmission line when the number counted by the counting means exceeds a predetermined number.
The welding system according to claim 4. The processing means performs processing based on a signal received via the relay device and a power transmission line when the comparison means determines that the two signals are different.
The welding system according to claim 3. The welding power source is
First communication means for receiving a welding condition setting signal for setting a welding condition;
First storage control means for changing a welding condition parameter stored in the first storage means based on the welding condition setting signal received by the first communication means;
Output control means for controlling the output of the welding power source device based on the welding condition parameters stored in the first storage means,
The first communication means transmits a welding condition parameter stored in the first storage means as a welding condition parameter signal,
The remote control device is:
Second storage control means for changing the welding conditions stored in the second storage means based on the operation by the welding operator;
Display means for displaying based on welding conditions stored in the second storage means;
A second communication means for transmitting the welding condition stored in the second storage means as a welding condition signal, and receiving the welding condition parameter signal transmitted by the first communication means;
Third storage means for storing a welding condition parameter based on the welding condition parameter signal received by the second communication means;
A determination unit that compares the welding condition stored in the second storage unit with the welding condition parameter stored in the third storage unit and determines whether or not they match;
Notification means for performing notification based on the determination result by the determination means;
With
The welding system according to any one of claims 1 to 6. The remote control device is a portable terminal.
The welding system according to any one of claims 1 to 7. A gas pipe for supplying a shielding gas to the welding torch via the welding power supply device and the wire feeding device;
The power transmission line is disposed inside the gas pipe.
The welding system according to any one of claims 1 to 8. Provided on the power transmission line for supplying electric power for driving the feeding motor of the wire feeding device from the welding power supply device to the wire feeding device,
Wireless communication is performed with a remote control device for remotely controlling the welding power source device,
Communicating with the welding power source device via the power transmission line,
A relay device characterized by that. Driving a welding power supply device, a wire feeding device, a welding torch, a power cable for supplying welding power from the welding power supply device to the welding torch, and a feeding motor of the wire feeding device Wireless communication is performed between the power transmission line for supplying power for power supply from the welding power supply device to the wire feeding device, the relay device provided on the power transmission line, and the relay device. A communication method of a welding system comprising a remote control device,
A first step in which the remote control device transmits a communication signal by radio;
A second step in which the relay device receives a communication signal transmitted by the remote control device;
A third step in which the relay device transmits the received communication signal to the welding power source device via the power transmission line;
A fourth step in which the welding power source device receives a communication signal transmitted via the power transmission line;
A communication method comprising:

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