JP2022147974A - Torch for heat processing and heat processing system - Google Patents

Abstract

To provide a torch for heat processing which is small, light-weight, and inexpensive and enables operations other than turing on/off electric power supply, and to provide a heat processing system.SOLUTION: A welding torch 3 includes: a torch main body (a torch body 37 and a handle 38); and a torch switch 31 which is attached to the handle 38 and pressed by a worker to be operated. The torch switch 31 includes a switch 32 which may output three and more types of operation signals according to a pressing force.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a thermal processing torch used for thermal processing and a thermal processing system.

There is a thermal processing system for performing thermal processing such as welding and cutting using heat such as arc. The thermal processing system includes a torch and a power supply that powers the torch. The torch has a torch switch operated by the operator. For example, in a welding system, when the torch switch is depressed by an operator, the power supply supplies power to the torch. As a result, an arc is generated between the tip of the torch and the workpiece, and welding is performed. Further, when the pressing of the torch switch is released, the power supply stops supplying power. This stops welding. Patent Literature 1 discloses an example of a welding torch.

Japanese Patent Application Laid-Open No. 2020-6409

There is a demand for a torch that is small, lightweight, and inexpensive, and that does not have extra functions. Since such a torch is provided with no operation means other than a torch switch, when performing inching or gas check, the operator must use the operation means provided in the power supply or the remote controller connected to the power supply. It is necessary to operate the operating means of Therefore, the operator must either move to the power supply or prepare a remote controller.

The present invention has been conceived under the circumstances described above, and provides a thermal processing torch and a thermal processing system which are small, lightweight, inexpensive, and capable of performing operations other than ON/OFF of welding work. is its purpose.

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

A thermal processing torch provided by the first aspect of the present invention comprises a tote body and a torch switch attached to the torch body and pressed by an operator. Accordingly, a multistage switch capable of outputting three or more types of operation signals is provided.

In a preferred embodiment of the present invention, the multistage switch outputs a first operation signal when pressed to the first stage, and is pressed to the second stage, which requires a greater pressing force than the first stage. A second operation signal is output when the

A thermal processing system provided by the second aspect of the present invention comprises a thermal processing torch provided by the first aspect of the present invention, and a power supply unit to which the operation signal output by the thermal processing torch is input. and the power supply device supplies power to the thermal processing torch when the second operation signal is input from the thermal processing torch.

In a preferred embodiment of the present invention, when the first operation signal is input from the thermal processing torch, the power supply device performs work based on any operation performed in thermal processing. .

A preferred embodiment of the present invention further comprises a feed motor for feeding welding wire to the thermal processing torch, and an electromagnetic valve for discharging shielding gas from a gas cylinder to the thermal processing torch. , the power supply device includes a switching unit for switching between performing inching and performing a gas check, and when the first operation signal is input from the thermal processing torch, according to the state of the switching unit, the The feed motor is caused to feed the welding wire for inching, or the solenoid valve is caused to release the shielding gas for the gas check.

According to the present invention, since the torch switch is provided with a multi-step switch, the thermal processing torch can output three or more kinds of operation signals without providing other operation means. Therefore, the thermal processing torch according to the present invention is compact, lightweight, and inexpensive, and is capable of performing operations other than turning on and off the welding work.

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 block diagram showing the whole welding system composition provided with the welding torch concerning a 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the welding torch which concerns on 1st Embodiment, (a) is an external view, (b) is sectional drawing for demonstrating a torch switch. (a) is a schematic diagram for explaining the principle of operation of the switch, and (b) is a schematic diagram for explaining the principle of operation of a modification of the switch. It is the schematic for demonstrating the principle of operation of the modification of a switch.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings, taking as an example the case where the present invention is applied to a welding torch (welding system).

[First embodiment]
FIG. 1 is a diagram for explaining a welding system A1 provided with a welding torch according to the first embodiment, and is a block diagram showing the overall configuration of the welding system A1.

As shown in FIG. 1, a welding system A1 includes a welding power source 1, a wire feeder 2, a welding torch 3, a torch cable 39, power cables 41 and 42, a signal line 5, a gas cylinder 6, and a gas pipe 7. ing. In this embodiment, the welding system A1 corresponds to the "thermal processing system" of the present invention, and the welding torch 3 corresponds to the "thermal processing torch" of the present invention. Also, the welding power supply 1 corresponds to the "power supply" of the present invention.

One output terminal a of the welding power supply 1 is connected to the welding torch 3 via a power cable 41 . The wire feeder 2 feeds the welding wire to the welding torch 3 to project the tip of the welding wire from the tip of the welding torch 3 . The power cable 41 and the welding wire are electrically connected at the contact tip arranged at the tip of the welding torch 3 . The other output terminal b of welding power supply 1 is connected to workpiece W via power cable 42 . The welding power supply 1 generates an arc between the tip of the welding wire protruding from the tip of the welding torch 3 and the workpiece W, and supplies power to the arc. The welding system A1 welds the workpiece W with the heat of the arc. Welding system A1 uses a shielding gas during welding. The shielding gas from the gas cylinder 6 is supplied to the tip of the welding torch 3 through a gas pipe 7 provided so as to pass through the welding power supply 1 and the wire feeder 2 .

The welding power supply 1 supplies electric power for arc welding to the welding torch 3 . The welding power supply 1 also controls the wire feeder 2 . The welding power supply 1 includes a power supply section 11, a feed motor control section 12, an electromagnetic valve control section 13, a signal input section 14, an operation section 15, and a control section 16 as functional configurations.

The power supply unit 11 converts three-phase AC power input from the power system P into power suitable for arc welding and outputs the power. The feeding motor control section 12 controls a feeding motor 21 (described later) of the wire feeding device 2 according to a command from the control section 16 . The solenoid valve control section 13 controls a gas solenoid valve 24 (described later) of the wire feeding device 2 according to a command from the control section 16 .

The signal input section 14 outputs an operation signal input from the welding torch 3 via the signal line 5 to the control section 16 . In this embodiment, the signal input unit 14 applies a predetermined voltage to the signal line 5 and detects current flowing through the signal line 5 . The signal input section 14 outputs the detected current signal to the control section 16 . In this embodiment, the signal input unit 14 detects a state in which no current is flowing and a state in which there are two levels of current. That is, three types of operation signals are input to the signal input unit 14 from the welding torch 3 via the signal line 5 . Hereinafter, an operation signal that is a low-level current will be referred to as a "first operation signal", and an operation signal that is a high-level current will be referred to as a "second operation signal".

The operation unit 15 includes operation means (not shown), and outputs an operation signal to the control unit 16 according to the operation of the operation means. The control unit 16 outputs commands to the power supply unit 11 , the feed motor control unit 12 , and the electromagnetic valve control unit 13 in response to operation signals input from the operation unit 15 and the signal input unit 14 . The control unit 16 performs different control depending on whether the first operation signal is input from the signal input unit 14 or the second operation signal is input.

The wire feeding device 2 feeds welding wire to the welding torch 3 . The welding wire is guided to the tip of the welding torch 3 through the torch cable 39 and the inside of the liner provided inside the welding torch 3 . The wire feeder 2 includes a feed motor 21 , a feed roller 22 , a wire reel 23 and a gas electromagnetic valve 24 . The feed motor 21 is controlled by the feed motor controller 12 to rotate the feed roller 22 . The feeding roller 22 feeds the welding wire wound around the wire reel 23 by rotating. The gas solenoid valve 24 is provided in the gas pipe 7 inside the wire feeder 2 . The gas solenoid valve 24 is controlled to open and close by the solenoid valve control unit 13 , and releases shielding gas from the gas cylinder 6 to the welding torch 3 when opened. Note that the gas solenoid valve 24 may be provided in a device other than the wire feeding device 2 (for example, the welding power source device 1).

The wire feeder 2 and welding torch 3 are connected by a torch cable 39 . The torch cable 39 is a cable connected to the proximal end of the welding torch 3, and has a power cable 41, a signal line 5, a gas pipe 7, and a liner inside the cable.

The welding torch 3 is held by an operator to perform welding. The welding torch 3 welds the workpiece W with the welding power supplied from the welding power supply 1 .

FIG. 2 is a diagram showing an example of the welding torch 3. As shown in FIG. 1(a) is an external view of the welding torch 3. FIG. FIG. 1(b) is a sectional view for explaining the torch switch. The welding torch 3 includes a torch body 37, a nozzle 371, a handle 38, and a torch switch 31, as shown in FIG. 2(a).

The torch body 37 is a cylindrical member made of metal, and has a liner through which a welding wire is inserted, a power cable 41, a signal line 5, and a gas pipe 7. A nozzle 371 is attached to the tip of the torch body 37 . The torch body 37 has a curved portion so that the operator can easily direct the nozzle 371 toward the workpiece W. As shown in FIG. The handle 38 is a part to be gripped by an operator, and is provided to hold the base end of the torch body 37 . A worker grips this handle 38 and performs welding work. A torch switch 31 is arranged on the handle 38 . A combination of the torch body 37 and the handle 38 corresponds to the "torch body" of the present invention.

The torch switch 31 is an operation means for receiving a welding start/stop operation, and is arranged at a position where the worker holding the handle 38 can easily press it with his or her index finger. An operation signal (second operation signal) is output to welding power supply 1 by turning on (pressing) torch switch 31 . Welding power supply 1 outputs welding power when an operation signal (second operation signal) is input by an ON operation. When the ON operation of torch switch 31 is released, welding power supply 1 no longer receives the operation signal (second operation signal) and stops outputting welding power. In other words, the welding power supply 1 supplies welding power to the welding torch 3 only while the torch switch 31 is being turned on. The welding torch 3 can perform welding only while welding power is being supplied. In this embodiment, the torch switch 31 can output a first operation signal for performing other functions, in addition to the second operation signal for outputting welding power.

The torch switch 31 includes a switch 32, a switch cover 33, a spring 34, and a mounting portion 35, as shown in FIG. 2(b).

The attachment portion 35 is a member for attaching the torch switch 31 to the handle 38 . The mounting portion 35 is fixed to the handle 38 .

The switch cover 33 covers the switch 32 between itself and the handle 38 and transmits the pressing operation by the operator to the switch 32 . One end (the left end in FIG. 2B) of the switch cover 33 is rotatably mounted around a fixed shaft 351 of the mounting portion 35, and the other end (the left end in FIG. The right end in FIG. 2(b) is always biased downward in FIG. As a result, when there is no pressing operation by the operator, the other end of the switch cover 33 is moved downward by the spring 34, and the transmission of the pressing operation to the switch 32 is cancelled. A projecting portion 331 is arranged inside the switch cover 33 . The projecting portion 331 is in contact with an operation lever 321 (described later) of the switch 32 . When the operator presses the other end of the switch cover 33 upward, the protrusion 331 presses the tip of the operating lever 321 upward.

The switch 32 is fixed to the mounting portion 35 and has an operating lever 321 , a plunger 322 and a fixed shaft 323 . The operation lever 321 is rotatably attached around a fixed shaft 323 at its proximal end. The operating lever 321 pushes the plunger 322 by moving the tip upward by the projecting portion 331 of the switch cover 33 . When the operator presses the switch cover 33, the plunger 322 of the switch 32 is pressed. Switch 32 outputs an operation signal corresponding to the pressing force of the pressing operation to welding power supply 1 via signal line 5 . In this embodiment, the switch 32 is a two-stage push-in switch, and includes an operation signal indicating a non-operated state (hereinafter sometimes referred to as a "non-operation signal") and two other types of signals. output the operation signal of In this embodiment, switch 32 comprises a variable resistor with two contacts. In the variable resistor, the contact point is switched according to the moving distance of the plunger 322 according to the pressing force, and the resistance value is switched. Since a predetermined voltage is applied from the signal line 5, the switch 32 outputs a current corresponding to the resistance value of the variable resistor.

FIG. 3A is a schematic diagram for explaining the principle of operation of the switch 32. FIG. When the plunger 322 of the switch 32 is not pressed, the contact 51 provided at the tip of the signal line 5 is not connected to any contact of the variable resistor. In this case, since no current flows through the signal line 5 , a no-operation signal is output to the welding power supply 1 . When the plunger 322 is pushed to the first stage, the contact 51 connects to the contact P1 of the variable resistance, as indicated by the dashed line in FIG. 3(a). In this case, the resistance value of the variable resistor becomes a high resistance value (R1+R2) and a low level current flows through the signal line 5, so that the welding power supply 1 outputs the first operation signal. When the plunger 322 is pressed to the second stage, which requires a greater pressing force than the first stage, the contact 51 is connected to the contact P2 of the variable resistance as indicated by the dashed line in FIG. 3(a). In this case, the resistance value of the variable resistor becomes a low resistance value (R1) and a high level current flows through the signal line 5, so that the welding power supply 1 outputs the second operation signal.

Note that the configuration of the switch 32 is not limited to that described above. Also, the appearance of the welding torch 3 is not limited to that described above. For example, the shape of the torch body 37 or handle 38 is not limited. Also, the location and shape of the torch switch 31 are not limited.

Next, the control of welding power supply 1 with respect to the operation of torch switch 31 will be described.

A worker strongly presses the torch switch 31 when performing a welding operation. As a result, plunger 322 of switch 32 is pressed to the second stage, and switch 32 outputs a second operation signal to welding power supply 1 . Control unit 16 of welding power supply 1 performs control for welding when the second operation signal is input. Specifically, first, the controller 16 outputs an open command to the solenoid valve controller 13 . The solenoid valve control unit 13 that receives the open command opens the gas solenoid valve 24 to release the shielding gas from the gas cylinder 6 to the welding torch 3 . Next, the control unit 16 outputs a feed command to the feed motor control unit 12 and outputs an output command to the power supply unit 11 . The feed motor controller 12 that receives the feed command rotates the feed motor 21 to feed the welding wire from the wire reel 23 to the welding torch 3 . The power supply unit 11 that receives the output command supplies welding power to the welding torch 3 . As a result, an arc is generated between the welding torch 3 and the workpiece W, and arc welding is started.

When the operator releases the pressure on the torch switch 31, the pressure on the plunger 322 of the switch 32 is released, and the switch 32 stops outputting the second operation signal to the welding power supply 1 (the no operation signal is output). state). As a result, control unit 16 of welding power supply 1 stops welding. Specifically, first, the control unit 16 outputs a feed stop command to the feed motor control unit 12 and a stop command to the power supply unit 11 . The feed motor control unit 12 that receives the feed stop command stops the rotation of the feed motor 21 to stop feeding the welding wire. Upon receiving the stop command, the power supply unit 11 stops supplying welding power. This stops arc welding. Also, the control unit 16 outputs an opening stop command to the solenoid valve control unit 13 . The solenoid valve control unit 13 that receives the open stop command closes the gas solenoid valve 24 to stop the release of the shielding gas. Thus, welding is performed only while the torch switch 31 is strongly pressed (while the plunger 322 of the switch 32 is pressed to the second stage). The order and timing of outputting each command by the control unit 16 are not limited.

In this embodiment, the operator can perform an operation other than starting welding by pressing the torch switch 31 weakly. When the operator presses the torch switch 31 weakly, the plunger 322 of the switch 32 is pressed to the first stage, and the switch 32 outputs the first operation signal to the welding power supply 1 . When the first operation signal is input, the control unit 16 of the welding power supply 1 performs control for preset work different from control for welding. For example, inching and gas check are set as work to be performed when the first operation signal is input. The control unit 16 has a switching unit 161 . The switching unit 161 sets the work to be performed when the first operation signal is input to either inching or gas check according to the operation signal input from the operation unit 15 . The operator can switch the work when the first operation signal is input by operating the operation means (for example, a changeover switch) of the operation unit 15 .

When inching is set by the switching unit 161, the control unit 16 performs control for inching when the first operation signal is input. Specifically, the controller 16 outputs a feed command to the feed motor controller 12 . The feed motor controller 12 that receives the feed command rotates the feed motor 21 to feed the welding wire from the wire reel 23 to the welding torch 3 . When the operator releases the torch switch 31 from being pressed, the switch 32 stops outputting the first operation signal to the welding power supply 1 (a state in which the no-operation signal is output). As a result, the controller 16 of the welding power supply 1 outputs a feed stop command to the feed motor controller 12 . The feed motor control unit 12 that receives the feed stop command stops the rotation of the feed motor 21 to stop feeding the welding wire. Thus, the welding wire is fed only while the torch switch 31 is pressed weakly (while the plunger 322 of the switch 32 is pressed to the first stage), and the operator can perform inching. .

When the gas check is set by the switching unit 161, the control unit 16 performs control for the gas check when the first operation signal is input. Specifically, the controller 16 outputs an open command to the solenoid valve controller 13 . The solenoid valve control unit 13 that receives the open command opens the gas solenoid valve 24 to release the shielding gas from the gas cylinder 6 to the welding torch 3 . When the operator releases the torch switch 31 from being pressed, the switch 32 stops outputting the first operation signal to the welding power supply 1 (a state in which the no-operation signal is output). As a result, control unit 16 of welding power supply 1 outputs an open stop command to solenoid valve control unit 13 . The solenoid valve control unit 13 that receives the open stop command closes the gas solenoid valve 24 to stop the release of the shielding gas. Thus, shielding gas is released from the welding torch 3 only while the torch switch 31 is pressed weakly (while the plunger 322 of the switch 32 is pressed to the first stage), and the operator can perform a gas check. It can be performed.

Only one of inching and gas check may be set as the work to be performed when the first operation signal is input. In this case, the control unit 16 does not have to include the switching unit 161 . Further, the work performed when the first operation signal is input is not limited to inching and gas check, and may be work based on any operation performed in the welding process. If the welding torch 3 is a water-cooled torch, the welding system A1 further comprises a chiller for circulating cooling water. The chiller operates during the welding process to circulate cooling water to the welding torch 3. In this case, activation of the chiller may be set as the work to be performed when the first operation signal is input. That is, the control part 16 may output a start command to a chiller, and may start a chiller, when a 1st operation signal is input. Further, a chiller start-up check may be set as the work to be performed when the first operation signal is input.

Next, the effects of the welding torch 3 and the welding system A1 will be described.

According to this embodiment, the torch switch 31 of the welding torch 3 comprises a switch 32 . The switch 32 is a two-step push-in switch, and can output two types of operation signals according to the pressing force of the pressing operation, in addition to the no-operation signal. Therefore, the welding torch 3 can output three kinds of operation signals (no-operation signal, first operation signal, and second operation signal) without having any operating means other than the torch switch 31 . The welding torch 3 can be reduced in size and weight as compared with a welding torch further provided with operation means other than the torch switch 31, and can also reduce manufacturing costs. In addition, since the welding torch 3 can output two kinds of operation signals in addition to the non-operation signal only by the torch switch 31, operations other than ON/OFF of the welding operation are also possible. Therefore, there is no need to operate the operation means of the welding power supply 1 for operations other than turning on and off the welding work, and there is no need to prepare a remote controller.

Further, according to this embodiment, the control unit 16 includes a switching unit 161 . The switching unit 161 sets the work to be performed when the first operation signal is input to either inching or gas check. Therefore, the operator can select the work to be performed when the torch switch 31 is operated to output the first operation signal.

Further, according to the present embodiment, the switch 32 has a variable resistor, and upon application of a predetermined voltage from the signal input section 14, outputs a current corresponding to the resistance value of the variable resistor. The signal input section 14 outputs an operation signal to the control section 16 according to the current input from the switch 32 . Thereby, the torch switch 31 can output an operation signal corresponding to the pressing force to the welding power supply 1 .

Further, according to the present embodiment, the switch 32 outputs the first operation signal when the plunger 322 is pushed to the first stage, and is pushed to the second stage, which requires more pressing force than the first stage. A second operation signal is output when the Thereby, the torch switch 31 can output two types of operation signals according to the pressing force.

Further, according to the present embodiment, the welding power supply 1 performs welding by outputting welding power when the second operation signal is input from the torch switch 31, and performs welding when the first operation signal is input from the welding torch 3. work other than welding when necessary. Therefore, the operator can perform welding by operating the torch switch 31, and can also perform work other than welding.

In this embodiment, the case where the control unit 16 of the welding power supply 1 performs control according to the operation signal from the switch 32 has been described, but the present invention is not limited to this. For example, the wire feeding device 2 may be provided with a control section and control may be performed according to the operation signal from the switch 32 . Welding system A1 may further include a control device, and the control device may perform control according to an operation signal from switch 32 .

Also, in the present embodiment, the switch 32 has been described as having a variable resistor with two contacts, but the present invention is not limited to this. The switch 32 may include a variable resistor whose resistance value changes continuously according to the movement distance of the plunger 322 (see FIG. 3(b)). In this case, since the resistance value changes continuously according to the pressing force, the current flowing through the signal line 5 also changes continuously. The signal input unit 14 may determine two types of operation signals depending on whether the detected current is equal to or greater than the threshold or less than the threshold.

Also, the variable resistance provided in the switch 32 is not limited. For example, as shown in FIG. 4, a plate-shaped resistor 91 and a conductor 92 made of an elastically deformable conductive material (eg, conductive silicon rubber) are provided, and the contact between the conductor 92 and the resistor 91 is It may be a variable resistor whose resistance value changes according to its area. When the plunger 322 of the switch 32 is not pressed, the conductor 92 is separated from the resistor 91 as shown in FIG. 4(a). In this case, the resistance value of the variable resistor remains the same as the resistance value of the resistor 91 and a relatively low level current flows through the signal line 5 . When the plunger 322 is pushed to the first stage, part of the conductor 92 contacts the resistor 91 as shown in FIG. 4(b). In this case, since part of the current flows around the conductor 92, the resistance value of the variable resistor becomes smaller than the resistance value of the resistor 91, and the signal line 5 has a higher level than in the case of FIG. 4(a). current flows. When the plunger 322 is pushed to the second stage, as shown in FIG. 4C, the contact area between the conductor 92 and the resistor 91 becomes larger than in the case of FIG. 4B. In this case, more current flows around the conductor 92, so that the resistance of the variable resistor becomes even smaller than in the case of FIG. level current flows. Thus, the variable resistor shown in FIG. 4 can also output a current corresponding to the pressing force. The variable resistor included in the switch 32 may be one whose resistance value changes depending on the pressing force.

In this embodiment, the switch 32 has a variable resistor, and the signal input unit 14 applies a predetermined voltage to the variable resistor of the switch 32 via the signal line 5 to detect the current flowing through the signal line 5. Although the case in which the operation signal is detected by . The switch 32 only needs to be able to output different operation signals depending on the pressed state.

Further, in the present embodiment, the case where the switch 32 outputs three types of operation signals (the no-operation signal, the first operation signal, and the second operation signal) has been described, but the present invention is not limited to this. The switch 32 may output four or more types of operation signals. In this case, welding power supply 1 can set a different work for each input operation signal. For example, when the switch 32 can output four types of operation signals, the welding power supply 1 performs inching when the first operation signal is input, performs gas check when the second operation signal is input, It can be set to perform welding when the third operation signal is input. In this case, the operator can perform three types of work, inching, gas check, and welding, simply by operating the torch switch 31 .

In the present embodiment, the welding system A1 is supplied with a shielding gas during welding and the welding wire is fed by the wire feeding device 2, for example, MIG (MAG) welding. is not limited to For example, the welding system A1 may perform TIG welding or the like in which no welding wire is used. In this case, the welding system A1 does not have the wire feeder 2. On the other hand, the welding system A1 includes a high frequency power supply that applies a high frequency voltage to start the main welding. In this case, a start-up check of the high-frequency power supply may be set as the work to be performed when the first operation signal is input. That is, the control section 16 may output a start command to the high-frequency power supply when the first operation signal is input. This allows the operator to check whether the high-frequency power source can be properly activated and the high-frequency voltage can be applied. Welding system A1 may also perform plasma welding. In this case, welding system A1 supplies plasma gas and center gas in addition to shield gas. In this case, any gas check may be set as the work to be performed when the first operation signal is input. Also, the switching unit 161 may switch which gas is to be checked.

Moreover, in this embodiment, the case where the present invention is applied to a welding torch (welding system) has been described, but the present invention is not limited to this. For example, the present invention can be applied to an arc cutting torch (arc cutting system) that cuts the workpiece W with an arc generated at the tip, an arc gouging torch (arc gouging system) that performs grooving on the workpiece W, and the like. can be applied. The present invention is also applicable to a thermal processing torch (thermal processing system) that performs thermal processing such as gas welding and resistance welding without being limited to thermal processing using an arc. For example, a resistance welding system includes a clamping device that clamps and clamps the work piece W during the welding process. The fixing device clamps and fixes the workpiece W by pressurization by hydraulic pressure before the welding current is applied. In this case, activation check of the hydraulic solenoid valve may be set as the work to be performed when the first operation signal is input. That is, the controller 16 may open the electromagnetic valve of the fixing device when the first operation signal is input. This allows the operator to check if the fixation device is working correctly.

The thermal processing torch and thermal processing system according to the present invention are not limited to the embodiments described above. The specific configuration of each part of the thermal processing torch and the thermal processing system according to the present invention can be modified in various ways.

A1: Welding system (thermal processing system), 1: Welding power supply device, 161: Switching unit, 2: Wire feeding device, 21: Feeding motor, 24: Gas solenoid valve, 3: Welding torch (torch for thermal processing) , 31: torch switch, 32: switch (multi-stage switch), 37: torch body (torch body), 38: handle (torch body), 6: gas cylinder

Claims (5)

a tote body,
a torch switch attached to the torch body and pressed by an operator;
with
The torch switch comprises a multistage switch capable of outputting three or more types of operation signals according to the pressing force.
Torch for thermal processing. The multistage switch outputs a first operation signal when pressed to the first stage, and outputs a second operation signal when pressed to a second stage that requires more pressing force than the first stage. ,
The torch for thermal processing according to claim 1. A thermal processing torch according to claim 2;
a power supply device to which the operation signal output by the thermal processing torch is input;
with
The power supply device supplies power to the thermal processing torch when the second operation signal is input from the thermal processing torch.
Thermal processing system. When the first operation signal is input from the thermal processing torch, the power supply device performs work based on any operation performed in thermal processing,
4. The thermal processing system of claim 3. a feed motor for feeding welding wire to the thermal processing torch;
a solenoid valve for releasing shielding gas from a gas cylinder to the thermal processing torch;
further comprising
The power supply device
Equipped with a switching unit that switches between performing inching and performing a gas check,
When the first operation signal is input from the thermal processing torch, depending on the state of the switching unit, the feed motor is caused to feed the welding wire for the inching, or the gas is fed. causing the solenoid valve to release the shielding gas for checking;
5. The thermal processing system of claim 4.

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