JPH0623549A - Consumable electrode arc welding power unit - Google Patents

Abstract

PURPOSE:To improve working efficiency by reducing the number of interruptions of welding work due to welding abnormality. CONSTITUTION:A control circuit part 14 classifies the cause of welding start failure at the welding start of the consumable electrode arc welding power unit into the case caused by clogging of a welding wire 6 due to fusion, etc., of a tip 4, the case caused by sticking of insulating material such as slag to the tip part of the welding wire 6 and further, the case caused by sticking of insulating material such as slag to the surface of base metals 5 according to detected values of a welding current value detection part 12, a welding voltage value detection part 13 and a motor current value detection part 10. A command of countermeasure according to abnormal contents is outputted to an external device 15 such as a welding robot controller. Consequently, the number of interruptions of welding work due to the welding start failure can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable electrode type arc welding machine for performing welding by generating an arc between a welding wire which is a consumable electrode and a base material which is a workpiece. The present invention relates to an electrode type arc welding power supply device.

[0002]

2. Description of the Related Art Conventionally, a consumable electrode type arc welding power supply device, when receiving a welding start command, causes a welding wire, which is a consumable electrode, to approach a base material, which is an object to be welded, at a constant speed. An arc is generated between the base metal and the base metal to start the welding work. With the start of this welding, when the welding wire, which is a consumable electrode, is fused and clogged with the tip, which is the current-carrying part of the welding output, or when the tip of the welding wire, which is a consumable electrode, has insulation such as slag. When they adhere, or when an insulator such as slag adheres to the surface of the base material that is the work piece, an arc is generated between the welding wire that is the consumable electrode and the base material that is the work piece. In some cases it was impossible to let them do it.

[0003]

Therefore, in the above-mentioned conventional consumable electrode type arc welding power supply device, the welding current is generated between the welding wire, which is a consumable electrode, and the base material, which is the object to be welded, at the start of welding. Determine whether or not is flowing,
When the welding current is not flowing, it is judged that the welding is abnormal, and the welding work is stopped, which causes a problem that the work efficiency of the welding work is reduced.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a consumable electrode type arc welding power supply device capable of improving the work efficiency by reducing the number of interruptions of the welding work due to abnormal welding. And

[0005]

In order to solve the above-mentioned problems, a consumable electrode type arc welding power supply device of the present invention includes an output control element section for supplying a welding output and a welding current detected by the welding output. A welding current value detection unit that outputs a current value signal, a welding voltage value detection unit that detects the welding voltage of the welding output and outputs a welding voltage value signal, and a welding wire that is a consumable electrode is automatically fed. A motor current value detection unit that detects the motor current of the wire feeding motor and outputs a motor current value signal; a forward rotation / reverse rotation switching unit that switches the rotation direction of the wire feeding motor between forward rotation and reverse rotation; A current value signal, a welding voltage value signal and a motor current value signal are input, and a forward rotation command signal or a reverse rotation command signal is output to the forward rotation / reverse rotation switching section, and the welding robot used for welding is controlled. And a control circuit unit for outputting various welding abnormality coping commands to an external device such as a device, the control circuit unit, after a predetermined time has elapsed after receiving a welding start command signal from the external device, the welding current value When the output signal of the detection unit is 0, the output signal of the welding voltage value detection unit is a high voltage in an unloaded state, and the output signal of the motor current value detection unit is excessive, the forward rotation / reverse rotation switching unit is activated. A reverse rotation command signal is given to feed the welding wire in the reverse rotation direction, and if the output signal of the motor current value detection unit at this time is excessive, the supply of welding output from the output control element unit is stopped. At the same time, the content of the welding abnormality countermeasure command is output to the external device as a welding wire clogging abnormality.

In addition to the above configuration, the consumable electrode type arc welding power supply device of the present invention is such that the control circuit section of the welding current value detecting section operates a predetermined time after receiving a welding start command signal from an external device. If the output signal is 0, the output signal of the welding voltage value detection unit is a high voltage in the no-load state, and the output signal of the motor current value detection unit is too large, give a reverse rotation command signal to the forward rotation / reverse rotation switching unit. When the welding wire is fed in the reverse direction and the output signal of the motor current value detection section at this time is within the normal range, a forward rotation command signal is given to the forward rotation / reverse rotation switching section and welding is started again. It is configured to start operation.

Further, in the consumable electrode type arc welding power source device of the present invention, in addition to the structure of claim 1, the control circuit portion has a welding current value after a predetermined time has elapsed after receiving a welding start command signal from an external device. When the output signal of the detection unit is 0, the output signal of the welding voltage value detection unit is a high voltage in the no-load state, and the output signal of the motor current value detection unit is excessive, a reverse rotation command signal is sent to the forward / reverse rotation switching unit. Is supplied to feed the welding wire in the reverse direction, and when the output signal of the motor current value detection unit at this time is within the normal range, the supply of welding output from the output control element unit is stopped. The contents of the welding abnormality countermeasure command are output to the external device as welding wire tip slag adhesion abnormality.

Further, the control circuit portion of the consumable electrode type arc welding power supply device of the present invention is configured to perform the operation of claim 3 after repeating the operation of claim 2 a plurality of times.
Further, in the consumable electrode type arc welding power supply device of the present invention, in addition to the configuration of claim 1, the control circuit section again performs a welding start command signal from an external device after performing the operation of claim 3 or claim 4. After a lapse of a predetermined time after receiving, the output signal of the welding current value detection unit is 0, the output signal of the welding voltage value detection unit is a high voltage in an unloaded state, and the output signal of the motor current value detection unit is excessive. In this case, a reverse rotation command signal is given to the forward rotation / reverse rotation switching portion to feed the welding wire in the reverse rotation direction, and if the output signal of the motor current value detection portion at this time is within the normal range, the output control element The supply of the welding output from the section is stopped, and the content of the welding abnormality countermeasure command is output to the external device as the abnormality of the adhesion of the base material surface slag.

[0009]

With the above configuration, the control circuit section starts welding at the start of welding of the consumable electrode type arc welding power supply device according to the detected values of the welding current value detecting section, the welding voltage value detecting section and the motor current value detecting section. The cause of failure is clogging of the welding wire, which is a consumable electrode due to tip fusion, etc., adhesion of an insulator such as slag to the tip of the welding wire, which is a consumable electrode. Stops welding work due to failure to start welding by classifying cases where there is insulation such as slag on the surface of a certain base material and outputting a coping command according to the abnormality content to an external device such as the controller of the welding robot. The number of times can be reduced and the welding work efficiency can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a consumable electrode type arc welding power supply device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is an input terminal of a consumable electrode type arc welding power supply device. The output control element section 2 to which these input terminals 1 are connected is connected to the output terminal 3, and supplies the welding output of the consumable electrode type arc welding power supply device to the output terminal 3. One of the output terminals 3 is connected to the tip 4 which energizes the welding output, and the other is connected to the base material 5 which is the workpiece. A welding wire 6, which is a consumable electrode, is fed to the tip 4 by a wire feeding motor 7. A forward / reverse rotation switching unit 8 is connected to the wire feeding motor 7, and the forward / reverse rotation switching unit 8 causes the wire feeding motor 7 to rotate.
Change the rotation direction of to forward or reverse. Further, a shunt 9 as a motor current detector is interposed between the wire feeding motor 7 and the forward / reverse rotation switching unit 8, and a motor current value detector 10 connected to the shunt 9 is provided.
Detects the motor current of the wire feeding motor 7 that automatically feeds the welding wire 4 that is a consumable electrode, and outputs a motor current value signal. Further, a shunt 11 as a welding current detector is interposed between the other of the output control element unit 2 and the output terminal 3, and the welding current value detection unit 12 connected to this shunt 11 has an output control element. The welding current sent from the unit 2 is detected and a welding current value signal is output. Furthermore, the welding voltage value detection unit 13 connected between both output terminals 3 detects the welding voltage between both output terminals 3 and outputs a welding voltage value signal. These motor current value detector 10, welding current value detector
Control circuit unit 14 to which 12 and welding voltage value detection unit 13 are connected
Is connected to the output control element unit 2, the forward / reverse rotation switching unit 8, and an external device 15 such as a welding robot control device, and receives a welding current value signal, a welding voltage value signal, and a motor current value signal, Outputs a forward rotation command signal or a reverse rotation command signal to the forward rotation / reverse rotation switching unit 8 and controls the driving / stopping command of the output control element unit 2 and also controls the welding robot used for welding. It is configured to output various welding abnormality coping commands to the device 15.

The operation of the above arrangement will be described below. 2 to 6 are flow charts showing the operation of the consumable electrode type arc welding power supply device of FIG. As shown in FIG. 2, first,
In step S1, it is determined whether or not there is a welding start command until there is a welding start command. When a welding start command is input from the external device 15 with the start of normal welding, step S
In 2 the control circuit section 14 of the welding power supply device outputs a command signal to the forward / reverse rotation switching section 8 so that the feeding direction of the wire feeding motor 7 is in the forward direction, and at the same time the output voltage is welded in step S3. A drive command is issued to the output control element unit 2 so as to supply it to the work wire 6.

Next, in step S4, it is determined whether or not a predetermined time has elapsed after receiving the welding start command. If the predetermined time has not elapsed, the process returns to step S2 to repeat the above operation. When the predetermined time has elapsed, the output signal of the welding current value detection unit 12 becomes 0 in step S5.
If the current output signal is not 0, the process returns to step S2 to repeat the above operation. If the output signal of the welding current value detector 12 is 0, the output signal of the welding voltage value detector 13 is 0 in step S6.
If the output signal is 0, the process returns to step S1 to repeat the above operation. Also,
If the output signal of the welding voltage value detection unit 13 is not 0, it is determined in step S7 whether the output signal of the motor current value detection unit 10 is within the normal range, and if it is within the normal range, the step is performed. Returning to S1, the above operation is repeated. If the output signal of the motor current value detection unit 10 is out of the normal range, such as when the wire is clogged or when the welding wire 6 reaches the welding base metal 5, the forward / reverse rotation is switched in step S8. A command signal is output to the portion 8 so that the feeding direction of the wire feeding motor 7 is reversed, and the welding wire 6 is fed in the reverse direction.

At this time, in step S9, it is determined whether or not the output signal of the motor current value detector 10 is within a predetermined range. If the output signal of the motor current value detection unit 10 is not within the predetermined range, it is determined that the wire is clogged,
In step S10, the control circuit unit 14 stops the driving of the wire feeding motor 7, and in step S11, stops the output of the output control element unit 2. Further, in step S12, the welding abnormality content is a wire clogging abnormality, and an abnormality countermeasure command is issued. Is output to the external device 15 and the pilot lamp is turned on to notify the wire clogging abnormality.

Further, in step S9, the motor current value detector
When the output signal of 10 is within the predetermined range, the first embodiment shown in FIG. 3, the second embodiment shown in FIG. 4, the third embodiment shown in FIG. 4 is a flow chart of each of the fourth embodiment shown in FIG.

FIG. 3 is a flow chart showing the operation of the first embodiment when the motor current value is within the predetermined range in step S9 of FIG. As shown in FIG. 3, in step S13, the control circuit unit 14 outputs a command signal to the forward / reverse rotation switching unit 8 to change the feeding direction of the wire feeding motor 7 to the forward rotation direction, and starts welding again. The operation is started and the process returns to step S1.

FIG. 4 is a flow chart showing the operation of the second embodiment when the motor current value is within the predetermined range in step S9 of FIG. As shown in FIG. 4, the control circuit unit 14 outputs a feed stop command of the welding wire 6 to the forward / reverse rotation switching unit 8 in step S14, and then in step S15.
Then, the supply of the welding output of the output control element unit 2 is stopped. Further, in step S16, the content of the welding abnormality is notified to the external device 15 as the welding wire tip slag adhesion abnormality and an abnormality countermeasure command is output to the external device 15 to notify the abnormality of the wire tip slag by lighting the pilot lamp. Instructing the external device 15 to perform the cutting operation of the tip portion of the welding wire.

FIG. 5 is a flow chart showing the operation of the fourth embodiment when the motor current value is within the predetermined range in step S9 of FIG. As shown in FIG. 5, in step S17, it is determined whether or not this welding abnormality is the first time,
If the welding abnormality this time is the first time, the forward wire feed command processing of step S18 is performed, and the welding start operation is started again. If the welding abnormality this time is not the first time, the wire feeding stop process of step S19 is performed, and then step S20 is performed.
In step S21, the abnormality handling command is output to the external device 15 as a welding wire tip slug adhesion abnormality indicating that the welding wire tip slug is attached, and the pilot lamp is turned on to attach the wire tip slug. The abnormality is notified, and the external device 15 is instructed to perform the cutting operation of the tip portion of the welding wire.

FIG. 6 is a flow chart showing the operation of the fifth embodiment when the motor current value is within the predetermined range in step S9 of FIG. As shown in FIG. 6, the control circuit unit 14 outputs a feed stop command of the welding wire 6 to the forward / reverse rotation switching unit 8 in step S22, and then in step S23.
In step S24, the supply of welding output from the output control element section 2 is stopped, and it is further determined in step S24 whether or not the welding wire tip slag adhesion abnormality has occurred in the previous time as well. In the external device 15, the content of the welding abnormality is regarded as the base material surface slag adhesion abnormality, an abnormality countermeasure command is output to the external device 15, and the pilot lamp is lit to notify the abnormality of the base material surface slag adhesion, and the external device 15 is welded. Instruct to change the start position. If the welding wire tip slag adhesion abnormality is not the previous time, in step S26, the content of the welding abnormality is output to the external device 15 as a welding wire tip slag adhesion abnormality, an abnormality handling command is output to the external device 15, and the pilot lamp is turned on. The slag adhesion abnormality of the wire tip portion is notified by, for example, and the cutting operation of the welding wire tip portion is instructed to the external device 15.

[0019]

As described above, according to the present invention, when the cause of the unsuccessful welding start at the welding start of the consumable electrode type arc welding power supply device is the clogging of the welding wire which is the consumable electrode due to tip fusion or the like. , Welding wires that are consumable electrodes can be classified into cases where insulation such as slag adheres to the tip of the welding wire, and cases where insulation such as slag adheres to the surface of the base metal that is the object to be welded. It is possible to reduce the number of interruptions of welding work due to failure of welding start and improve work efficiency by outputting a countermeasure command according to various abnormal contents to an external device such as a control device of a robot for operation. The practical effect is great.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a consumable electrode type arc welding power supply device according to an embodiment of the present invention.

FIG. 2 is a flow chart showing the operation of the consumable electrode type arc welding power supply device of FIG.

3 is a flowchart showing the operation of the first embodiment when the motor current value is within a predetermined range in step S9 of FIG.

4 is a flowchart showing the operation of the second embodiment when the motor current value is within the predetermined range in step S9 of FIG.

5 is a flowchart showing the operation of the third embodiment when the motor current value is within the predetermined range in step S9 of FIG.

FIG. 6 is a flowchart showing the operation of the fourth embodiment when the motor current value is within the predetermined range in step S9 of FIG.

[Explanation of symbols]

 2 Output control element section 4 Chip 5 Base material 6 Welding wire 7 Wire feeding motor 8 Forward / reverse rotation switching section 9, 11 Shunt 10 Motor current value detection section 12 Welding current value detection section 13 Welding voltage value detection section 14 Control Circuit part 15 External device

Claims (5)

[Claims] 1. An output control element section for supplying a welding output, a welding current value detecting section for detecting a welding current of the welding output and outputting a welding current value signal, and a welding voltage for the welding output. A welding voltage value detection unit that outputs a welding voltage value signal,
A motor current value detection unit that automatically detects the motor current of a wire feeding motor that automatically feeds a welding wire that is a consumable electrode, and outputs a motor current value signal; A forward rotation / reverse rotation switching section for switching to reverse rotation and the welding current value signal, the welding voltage value signal and the motor current value signal are input, and a forward rotation instruction signal or a reverse rotation instruction signal is output to the forward rotation / reverse rotation switching section. , A control circuit unit that outputs various welding abnormality coping commands to an external device such as a control device of a welding robot used for welding, and the control circuit unit receives a welding start command signal from the external device. After the elapse of a predetermined time, the output signal of the welding current value detection unit is 0, the output signal of the welding voltage value detection unit is a high voltage in the no-load state, and the output signal of the motor current value detection unit Is too large, a reverse rotation command signal is given to the forward rotation / reverse rotation switching portion to feed the welding wire in the reverse rotation direction, and if the output signal of the motor current value detection portion at this time is excessive, A consumable electrode type arc welding power supply device configured to stop the supply of welding output from the output control element section and output the content of the welding abnormality countermeasure command to the external device as a welding wire clogging abnormality. 2. The control circuit section, when a predetermined time has elapsed after receiving a welding start command signal from an external device, the output signal of the welding current value detecting section is 0 and the output signal of the welding voltage value detecting section is no load. When the output signal of the motor current value detector is too high at a high voltage in the state, a reverse rotation command signal is given to the forward rotation / reverse rotation switching portion to feed the welding wire in the reverse rotation direction, and the motor current at this time The consumable electrode type arc welding power source according to claim 1, wherein if the output signal of the value detection unit is within a normal range, a normal rotation command signal is given to the normal rotation / reverse rotation switching unit to restart the welding start operation. apparatus. 3. The control circuit section outputs the output signal of the welding current value detection section is 0 and the output signal of the welding voltage value detection section is unloaded after a predetermined time has elapsed after receiving the welding start command signal from the external device. When the output signal of the motor current value detector is too high at a high voltage in the state, a reverse rotation command signal is given to the forward rotation / reverse rotation switching portion to feed the welding wire in the reverse rotation direction, and the motor current at this time When the output signal of the value detection unit is within the normal range, the supply of the welding output from the output control element unit is stopped, and the content of the welding abnormality countermeasure command is the external of the welding wire tip slag adhesion abnormality as the external. The consumable electrode type arc welding power supply device according to claim 1, which is configured to output to the device. 4. A consumable electrode type arc welding power supply device configured such that the control circuit section performs the operation of claim 3 after repeating the operation of claim 2 a plurality of times. 5. The control circuit section outputs the output signal of the welding current value detection section after a predetermined time elapses after receiving the welding start command signal from the external device again after performing the operation of claim 3 or 4. Is 0, the output signal of the welding voltage value detection unit is a high voltage in the no-load state, and the output signal of the motor current value detection unit is excessive, a reverse rotation command signal is given to the forward / reverse rotation switching unit for welding. When the wire is fed in the reverse direction, and the output signal of the motor current value detection unit at this time is within the normal range, the supply of welding output from the output control element unit is stopped and the welding abnormality countermeasure command The consumable electrode type arc welding power supply device according to claim 1, wherein the content is output to the external device as an abnormal adhesion of base material surface slag.