JP6600812B2 - Arc welding apparatus and arc welding method - Google Patents

Description

  The present disclosure relates to an arc welding apparatus and an arc welding method, and more particularly to supply control of shield gas used in gas shielded arc welding.

  In gas shielded arc welding, welding is performed by generating an arc in a shielding gas atmosphere to prevent oxidation and nitridation of the weld metal. At the start of welding, a preflow for supplying a shielding gas is performed before the arc is generated in order to reliably shield the welded portion. At the end of welding, since the shield is shielded until the molten pool is solidified, a post flow is performed to maintain the supply of shielding gas even after the arc is extinguished.

  A conventional gas metal arc welder described in Patent Document 1 will be described with reference to FIG. FIG. 5 is a diagram illustrating a state of a torch switch, a gas solenoid valve, and a welding output in a conventional gas metal arc welder.

  First, a conventional gas metal arc welding start method will be described. As shown in FIG. 5, when the torch switch is turned on and off, the welding output is turned off and the gas solenoid valve is turned on. As shown in FIG. 5, if the torch switch is not turned on before the preflow time T11 elapses after the gas solenoid valve is turned on, the gas solenoid valve is automatically turned off. Then, the pre-flow is performed by turning the torch switch on and off, and if the torch switch is turned on before the preflow time T11 elapses, the welding output is turned on.

  Next, a continuous welding method in conventional gas metal arc welding will be described. As shown in FIG. 5, even if the welding output is turned off, the gas solenoid valve is turned on during the postflow time T12. If the torch switch is turned on again before the postflow time T12 (for example, 10 seconds) elapses, the welding output is turned on without preflow. If the torch switch is not turned on after the welding output is turned off and the postflow time T12 elapses, the gas solenoid valve is automatically turned off.

JP-A-8-206837

  In a conventional gas metal arc welder, when a preflow time T11 and a postflow time T12 set in advance have elapsed, the gas solenoid valve is automatically turned off and the supply of shield gas is stopped. However, depending on the welding environment, it is necessary to extend the preflow time T11 or the postflow time T12 in order to prepare or maintain the shielding gas atmosphere. In the conventional gas metal arc welding machine, the torch is operated again and the supply of the shield gas can be resumed. However, since the supply of the shield gas is temporarily stopped, the shield gas atmosphere has temporarily deteriorated. Further, in the conventional gas metal arc welder, in order to extend the preflow time T11 or the postflow time T12, it is necessary for the operator to change the setting of the gas metal arc welder itself, and it is necessary to temporarily suspend the work. there were.

  The present disclosure provides an arc welding apparatus and an arc welding method capable of extending the preflow time and the afterflow time without interruption by operating a torch switch by an operator.

In order to solve the above problems, an arc welding apparatus of the present disclosure includes an arc welding torch, a shield gas supply device, and an arc welding power supply device. The arc welding torch has a torch switch. The shield gas supply device supplies shield gas to the arc welding torch. The arc welding power supply device is connected to an arc welding torch and a shield gas supply device. In the arc welding apparatus according to the present disclosure, the first operation is performed on the torch switch at the first time point while the shield gas is being supplied, so that the stop time for stopping the supply of the shield gas from the first time point. The supply of the shield gas is continued at the second time point when the first period has elapsed. Further, by performing a second operation different from the first operation on the torch switch while the shield gas is being supplied, the stop time is eliminated and the supply of the shield gas is continued, thereby generating an arc. Is done. Furthermore, the control for generating the arc is started at a third time point when the second period has elapsed since the start of the second operation.

  Another arc welding apparatus of the present disclosure includes an arc welding torch, a shield gas supply apparatus, and an arc welding power supply apparatus. The arc welding torch has a torch switch. The shield gas supply device supplies shield gas to the arc welding torch. The arc welding power supply device is connected to an arc welding torch and a shield gas supply device. In another arc welding apparatus according to the present disclosure, the first operation is performed on the torch switch at the first time point while the shield gas is being supplied, so that the stop time for stopping the supply of the shield gas is the first time. The supply of the shield gas is continued at the second time point when the first period has elapsed from the time point. Further, by performing a second operation different from the first operation on the torch switch while the shield gas is being supplied, the stop time is eliminated and the supply of the shield gas is continued, thereby generating an arc. Is done. Further, at the fourth time point when the second operation is finished, the control for generating the arc is finished, and the stop time is set to the fifth time point when the third period has elapsed from the fourth time point, so that the shielding gas is discharged. Supply continues.

In addition, the arc welding method of the present disclosure includes a first step, a second step, and a third step . In the first step, the shielding gas is supplied by operating the torch switch of the arc welding torch. In the second step, the stop time for stopping the supply of the shield gas by performing the first operation on the torch switch at the first time point during the supply of the shield gas in the first step, The supply of the shielding gas is continued at the second time when the first period has elapsed from the first time. In the third step, the second operation different from the first operation is performed on the torch switch while the shield gas is being supplied, so that the stop time is eliminated and the supply of the shield gas is continued. Control to generate is performed. Furthermore, the control for generating the arc is started at a third time point when the second period has elapsed since the start of the second operation.

  In addition, another arc welding method of the present disclosure includes a first step, a second step, and a third step. In the first step, the shielding gas is supplied by operating the torch switch of the arc welding torch. In the second step, the stop time for stopping the supply of the shield gas by performing the first operation on the torch switch at the first time point during the supply of the shield gas in the first step, The supply of the shielding gas is continued at the second time when the first period has elapsed from the first time. In the third step, the second operation different from the first operation is performed on the torch switch while the shield gas is being supplied, so that the stop time is eliminated and the supply of the shield gas is continued. Control to generate is performed. Further, at the fourth time point when the second operation is finished, the control for generating the arc is finished, and the stop time is set to the fifth time point when the third period has elapsed from the fourth time point, so that the shielding gas is discharged. Supply continues.

  As described above, according to the present disclosure, the supply time of the shield gas can be arbitrarily adjusted by the operator operating the torch switch.

FIG. 1 is a diagram illustrating a schematic configuration of an arc welding apparatus according to an embodiment of the present disclosure. FIG. 2 is a timing chart showing the relationship between the torch switch, shield gas supply, and welding output in the arc welding method according to the embodiment of the present disclosure. FIG. 3 is a timing chart showing the relationship between the torch switch, shield gas supply, and welding output in the arc welding method according to the embodiment of the present disclosure. FIG. 4 is a timing chart showing the relationship between the torch switch, shield gas supply, and welding output in the arc welding method according to the embodiment of the present disclosure. FIG. 5 is a diagram illustrating a state of a torch switch, a gas solenoid valve, and a welding output in a conventional gas metal arc welder.

(Embodiment)
The arc welding apparatus 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of an arc welding apparatus 1 according to the present embodiment. 2 to 4 are time charts showing the relationship between the torch switch, shield gas supply, and welding output in the arc welding method of the present embodiment.

  As shown in FIG. 1, the arc welding apparatus 1 includes an arc welding power supply device 2, an arc welding torch 3, a shield gas supply device 4, and a wire feeding device 5. The arc welding power supply device 2 includes a welding output control unit 21, a gas supply control unit 22, a main control unit 23, a wire feed control unit 24, and an output terminal 25. The arc welding torch 3 has a torch switch 31. The shield gas supply device 4 includes a gas cylinder 41 and a gas supply valve 42.

  The main control unit 23 is connected to the welding output control unit 21, the gas supply control unit 22, and the wire feed control unit 24. The main control unit 23 discriminates the operation of the torch switch 31 by the operator, and controls the welding output control unit 21, the gas supply control unit 22, and the wire feed control unit 24 by outputting signals. The main control unit 23 also has a function for measuring time (time keeping function). The main control unit 23 also stores a gas supply set time T1 (first period), an afterflow time T2 (third period), and a second operation determination time T3 (second period). Have

  The gas supply control unit 22 is connected to the gas supply valve 42 of the shield gas supply device 4, and controls opening and closing of the gas supply valve 42 based on a signal from the main control unit 23. Thereby, the shielding gas supplied from the gas cylinder 41 to the arc welding torch 3 is controlled.

  The wire feeding control unit 24 is connected to the wire feeding device 5 and controls the wire feeding device 5 based on a signal from the main control unit 23. Thereby, feeding of the wire 51 which is a consumable electrode supplied from the wire feeder 5 to the arc welding torch 3 is controlled.

  The welding output control unit 21 is connected to the output terminal 25 and controls the welding output via the output terminal 25 based on a signal from the main control unit 23. The output terminal 25 consists of two terminals, one terminal is connected to the wire 51 via the arc welding torch 3, and the other terminal is connected to the base material 6 that is an object to be welded. Thereby, the welding output between the base material 6 and the wire 51 is controlled. The welding output is a welding voltage and a welding current, and the control of the welding output is to control one or both of the welding voltage and the welding current. The arc 7 is generated between the wire 51 and the base material 6 by the welding output from the welding output control unit 21, and welding is performed on the base material.

  The gas cylinder 41 is connected to the arc welding torch 3 via the gas supply valve 42 and supplies the internal shielding gas to the arc welding torch 3.

  Next, an arc welding method using the arc welding apparatus 1 in the present embodiment will be described with reference to FIGS. 2 and 3.

  A method for extending and stopping the supply of shield gas without generating a welding output will be described with reference to FIG. In FIGS. 2 and 3, in the time charts of the torch switch, gas supply, and welding output, the lower part indicates OFF and the upper part indicates ON. Further, the state where the torch switch 31 is pressed is turned on, and the state where the torch switch 31 is not pressed is turned off. The state where the shield gas is supplied is turned on, and the state where the shield gas is not supplied is turned off. The state where the welding output is output is turned on, and the state where the welding output is not output is turned off. Here, ON of the welding output is a state in which a welding voltage including a no-load voltage output and a welding current are output from the two output terminals 25 of the arc welding power supply device 2.

  As shown on the left side of FIG. 2, when the operator performs a first operation (for example, single click) on the torch switch 31 without supplying shield gas or welding output, the shield gas is supplied. Be started. Specifically, when the first operation is performed on the torch switch 31, the main control unit 23 outputs a signal indicating that the first operation has been performed to the gas supply control unit 22. The gas supply control unit 22 controls the gas supply valve 42 based on the signal from the main control unit 23, and starts supplying shield gas for the gas supply set time T1. The gas supply set time T1 is controlled by setting a stop time for stopping the supply of the shield gas by the time measuring function of the main control unit 23. Then, when the operation of the torch switch 31 is not performed during the gas supply set time T1, the main control unit 23 performs the gas supply control unit when the gas supply set time T1 has passed (when the set stop time is reached). A signal for stopping the supply of the shielding gas is output to 22. The gas supply control unit 22 controls the gas supply valve 42 based on the signal from the main control unit 23 and stops the supply of the shield gas.

  Next, the extension of the supply of shield gas will be described. As shown in the center of FIG. 2, when the operator performs the first operation on the torch switch 31 at the time A during the gas supply set time T1, the supply of the shield gas is extended. Specifically, the main control unit 23 sets the gas supply set time T1 from the time point A to a stop time for stopping the supply of the shield gas by performing the first operation during the gas supply set time T1. It changes to the time B which passed. Then, when the operation of the torch switch 31 is not performed by the time point B, the main control unit 23 outputs a signal for stopping the supply of the shield gas to the gas supply control unit 22 at the time point B. The gas supply control unit 22 controls the gas supply valve 42 based on the signal from the main control unit 23 to stop the supply of the shield gas. Thereby, the operator can extend the time for supplying the shield gas without interrupting the supply of the shield gas by operating the torch switch 31. The control for extending the supply of shielding gas (changing the stop time) can be performed not only once but also a plurality of times.

Next, stop of the supply of shield gas will be described. As shown on the right side of FIG. 2, when the operator performs a third operation (for example, double click) on the torch switch 31 at time C during the gas supply set time T1, the supply of shield gas is stopped. . Specifically, the main control unit 23 changes the stop time for stopping the supply of the shield gas to be the time point C by the third operation being performed during the gas supply set time T1. Specifically, the main control unit 23 changes the stop time so as to be the time point D when the third operation ends. Then, the main control unit 23 outputs a signal for stopping the supply of the shield gas to the gas supply control unit 22 at the time C (specifically, the time D when the third operation is finished). The main control unit 23 may delete the stop time without changing the stop time and may output a signal for stopping the supply of the shield gas to the gas supply control unit 22. The gas supply control unit 22 controls the gas supply valve 42 based on the signal from the main control unit 23 to stop the supply of the shield gas. That is, the supply of shield gas can be stopped regardless of the remaining time of the gas supply set time T1. Thereby, the operator can determine the timing to stop the supply of the shield gas by operating the torch switch 31.

  As the first operation, for example, a single click is set. As the definition of single click, for example, the torch switch 31 is turned on and off within 0.3 seconds. That is, the on-state time of the torch switch 31 is 0.3 seconds or less. As the third operation, for example, a double click is set. As the definition of the double click, for example, the single click described above is performed twice at intervals of 0.3 seconds or less.

  By performing the above control, the operator can arbitrarily change the supply amount of the shield gas before the welding output by operating the torch switch 31. That is, according to the first operation, the shield gas can be supplied without interruption (shield gas supply can be extended), the working time can be shortened, and the amount of shield gas consumed can also be reduced. Further, the third operation can reduce the amount of shield gas consumed without excessively supplying shield gas. And since it can control only by operation of the torch switch 31 by an operator, work efficiency improves. Note that the extension of the supply of the shield gas by the first operation is performed at a point A when the first operation is started, as shown in FIG. Thereby, work start can be accelerated. Further, the supply of the shielding gas by the first operation may be performed at the time when the first operation is completed. The shield gas is stopped by the third operation at the time point D when the third operation is completed, as shown in FIG. Since the third operation is to stop the shielding gas, it is not executed until the operation is confirmed. Thereby, insufficient supply of shield gas can be avoided.

  Next, with reference to FIG. 3, a description will be given of a shield gas supply method involving generation of welding output. Since the supply extension and stop of the shield gas when no welding output is generated have been described above, the description thereof will be omitted.

  As shown on the left side of FIG. 3, when the operator performs a second operation (for example, long press) on the torch switch 31 in a state where the shielding gas is supplied, a welding output is generated. Specifically, when the second operation is performed on the torch switch 31 and it is determined that the second operation is being performed, the main control unit 23 confirms that the second operation is being performed. The signal shown is output to the welding output control unit 21. The welding output control unit 21 generates a welding output at the output terminal 25 based on a signal from the main control unit 23. Since the supply of the shield gas is continued when the welding output is generated, the main control unit 23 deletes the set stop time at the time point E. Further, in the present embodiment, the wire 51 that is a consumable electrode is fed to the arc welding torch 3 using the wire feeding device 5, so that at the time point E, the main control unit 23 performs the second operation. A signal indicating that the wire has been disconnected is output to the wire feed control unit 24. The wire feeding control unit 24 controls the feeding of the wire 51 by the wire feeding device 5 based on the signal from the main control unit 23. In addition, if it is arc welding by the non-consumable electrode which does not have the wire feeding apparatus 5, such as TIG (Tungsten Inert Gas) welding, control of the wire feed control part 24 is unnecessary.

  Next, stop of the welding output after the occurrence of the arc will be described. As shown on the left side of FIG. 3, when the operator finishes the second operation on the torch switch 31 at time F while the welding output is being generated, the welding output is stopped. Specifically, the main control unit 23 outputs a signal for stopping the welding output to the welding output control unit 21 at the time point F when the second operation is completed while the welding output is being generated. The welding output control unit 21 stops the welding output to the output terminal 25 based on the signal from the main control unit 23. Further, at time F, the main control unit 23 outputs a signal for stopping the feeding of the wire 51 to the wire feeding control unit 24. The wire feeding control unit 24 stops feeding the wire 51 by the wire feeding device 5 based on the signal from the main control unit 23. Since the welding output has occurred, at time F, the main control unit 23 newly sets a stop time for stopping the supply of the shield gas to time G when the afterflow time T2 has elapsed from time F. As described with reference to FIG. 2, the control for extending or stopping the supply of the shielding gas is performed if the first operation or the third operation is performed on the torch switch 31. If the operator does not operate the torch switch 31, the main control unit 23 outputs a signal for stopping the supply of the shield gas to the gas supply control unit 22 at the time point G and stops the supply of the shield gas.

  Next, the control of the arc welding method to which the present embodiment is applied will be described using the right side of FIG. As shown on the right side of FIG. 3, even when it is desired to temporarily interrupt the welding output, by performing the first operation at time H, the shield gas atmosphere once formed can be maintained, and the welding output can be resumed. Can be done quickly. In addition, although the shield gas atmosphere once formed for temporarily interrupting the welding output is maintained, the third operation is performed at the time point I at which it is desired to stop the restart of the welding output, thereby reducing the consumption of the shielding gas. it can.

  For example, long press is set as the second operation. As a definition of long press, for example, the torch switch 31 is turned on and off so as to maintain the on state of the torch switch 31 for more than 0.3 seconds. In this case, it is determined that the second operation is being performed when 0.3 seconds have passed since the torch switch 31 was turned on. The time required until the second operation is confirmed is the determination time T3.

  As described above, according to the arc welding apparatus of the present embodiment, the supply time of the shield gas until the welding output is started, the timing for starting the welding output, the timing for stopping the welding output, and the welding output stop The operator can arbitrarily control the later supply time of the shield gas by operating the torch switch 31.

  Further, regarding the control described with reference to FIGS. 2 and 3, the set values of the gas supply set time T <b> 1 and the afterflow time T <b> 2 can be arbitrarily changed with respect to the main control unit 23 of the arc welding power supply device 2. . In the present embodiment, the main control unit 23 has a time measuring function to measure time. However, the main control unit 23 performs only the operation of the input torch switch 31 with the welding output control unit 21 and the gas supply. You may output to the control part 22 or the wire feed control part 24. FIG. And the welding output control part 21, the gas supply control part 22, and the wire feed control part 24 may have a time measuring function, and may control themselves.

  Also, as shown in FIG. 4, if the second operation is performed in the absence of shield gas supply, even if it is determined that the second operation is performed from the determination time T3, the welding is immediately performed. It is preferable to provide a preflow period T4 without output.

  Further, in the present embodiment, an example is shown in which a single click of the torch switch 31 is performed as the first operation, a long press of the torch switch 31 is performed as the second operation, and a double click of the torch switch 31 is performed as the third operation. . However, the time during which the torch switch 31 is kept on may be the first operation. Alternatively, the first operation may be performed by clicking a predetermined number of times after the on-state of the torch switch 31 is continued for a predetermined time, or the first operation may be performed by variously combining the duration of the on-state of the torch switch 31 and the number of clicks. Good. Also, the number of clicks in the second operation may be set. For example, welding output is started when the torch switch 31 is double-clicked, and then the welding output is output when the torch switch 31 is double-clicked again. You may make it stop. Alternatively, the second operation may be performed by variously combining the on-time duration of the torch switch 31 and the number of clicks. Moreover, it is good also as continuing 3rd operation to the ON state of the torch switch 31 (it pushes long). Alternatively, the third operation may be performed by variously combining the duration of the ON state of the torch switch 31 and the number of clicks.

  According to the present disclosure, the supply time of the shield gas can be arbitrarily adjusted by the operation of the torch switch by the operator, and this is industrially useful as an arc welding apparatus and an arc welding method using the shield gas.

DESCRIPTION OF SYMBOLS 1 Arc welding apparatus 2 Arc welding power supply apparatus 3 Arc welding torch 4 Shielding gas supply apparatus 5 Wire feeding apparatus 6 Base material 7 Arc A time point B time point C time point D time point E time point F time point G time point H time point I time point 21 welding output Control unit 22 Gas supply control unit 23 Main control unit 24 Wire feed control unit 25 Output terminal 31 Torch switch 41 Gas cylinder 42 Gas supply valve 51 Wire T1 Gas supply set time T2 Afterflow time T3 Determination time T11 Preflow time T12 Postflow time

Claims (8)

An arc welding torch having a torch switch;
A shield gas supply device for supplying a shield gas to the arc welding torch;
An arc welding power supply device connected to the arc welding torch and the shield gas supply device;
By performing a first operation on the torch switch at a first time point while the shield gas is being supplied, a stop time for stopping the supply of the shield gas is a first period from the first time point. Is set at a second time point when the time elapses and the supply of the shielding gas is continued,
While the shield gas is being supplied, by performing a second operation different from the first operation on the torch switch, the stop time is deleted and the supply of the shield gas is continued, and the arc is turned on. Control is generated,
The control for generating the arc is an arc welding apparatus that is started at a third time point when a second period has elapsed since the start of the second operation.   At a fourth time point when the second operation is finished, the control for generating the arc is finished, and the stop time is set to a fifth time point when a third period has elapsed from the fourth time point. The arc welding apparatus according to claim 1, wherein the supply of the shielding gas is continued. By performing a third operation different from the first operation and the second operation on the torch switch at a sixth time point while the shield gas is being supplied, the stop time is the sixth time. The arc welding apparatus according to any one of claims 1 to 2 , wherein the supply of the shielding gas is stopped at the point of time. The arc welding apparatus according to claim 3 , wherein the third operation is double-clicking on the torch switch. The arc welding apparatus according to claim 1 , wherein the second operation is to continue the on state of the torch switch. The first operation, the arc welding apparatus according to claim 1 is to single click on the torch switch. A first step of supplying a shielding gas by operating a torch switch of an arc welding torch;
In the first step, by performing a first operation on the torch switch at a first time point while the shield gas is being supplied, a stop time for stopping the supply of the shield gas is A second step in which the supply of the shielding gas is continued at the second time point when the first period has elapsed from the time point 1;
While the shield gas is being supplied, by performing a second operation different from the first operation on the torch switch, the stop time is deleted and the supply of the shield gas is continued, and the arc is turned on. A third step in which the control to be generated is performed,
An arc welding method in which control for generating the arc is started at a third time point when a second period has elapsed since the start of the second operation. At a fourth time point when the second operation is finished, the control for generating the arc is finished, and the stop time is set to a fifth time point when a third period has elapsed from the fourth time point. The arc welding method according to claim 7, wherein the supply of the shielding gas is continued.

Images