JPH10286676A - Method for removing spatter in welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a spatter deposited in a welding torch easily and steadily. SOLUTION: At the time of removing a spatter deposited in the interior of a welding torch 1, compressed air is supplied into a compressed air supply pipe 23, the inlet of a flow direction changeover valve 24 is changed-over to supply compressed air to the welding torch 1, then compressed air is injected into a nozzle 6 from a plurality of orifices arranged at the sealed gas injection part 5 of the welding torch 1, and thus a deposited spatter is blown out of the nozzle 6 and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas shield door.
The present invention relates to a method for removing spatters generated and adhered in a welding torch for welding, and more particularly to an improvement in spatter removal efficiency.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG. 4, a welding torch 1 has a hollow contact tip 2 and a contact tip 2 attached thereto. Has a shield gas injection part 5 connected to the shield gas conduit 4 and a nozzle 6 made of copper alloy which covers the contact tip 2 and the shield gas injection part 5. And
The shield gas 7 supplied from the shield gas injection section 5 is injected from the nozzle 6 to the joint section 8 to discharge the arc 9 and the molten metal 1.
The welding wire 11 is slid through the inside of the contact tip 2 at a constant speed and welded while shielding 0 from the air.

When a welding operation is performed by a robot using this welding torch 1, for example, an arc is generated for a long time, so that the amount of spatter attached to the nozzle 6 of the welding torch 1 increases. In particular, as shown in the perspective view of the welding state in FIG. 5, when performing the welding operation in the upward position, the spatter 12 enters the inside of the nozzle 6 and adheres to the inner surface of the nozzle 6 and the surface of the contact tip 2. It accumulates and blocks the orifice 3 of the shield gas injection part 5, which causes welding defects. In order to prevent the occurrence of this welding defect, it is necessary to frequently remove the spatter 12 deposited and deposited between the nozzle 6 and the contact tip 2.

In order to remove the spatter 12 deposited between the nozzle 6 and the contact tip 2, a cutting tool 61 having a cutting blade 62 at the tip is inserted into the nozzle 6 as shown in a perspective view of FIG. Then, while rotating the cutting tool 61, the spatter 12 in the nozzle 6 is crushed and removed by the cutting blade 62, or a compressed air supply pipe 71 is attached to an intermediate portion of the nozzle 6 as shown in a perspective view of FIG. Compressed air having a pressure of about 5 kgf / cm ² is supplied from a middle portion of the nozzle 6 to a space where the sputter 12 is deposited, that is, a space formed by the shield gas injection portion 5 having the contact tip 2 and the orifice 3 and the inner surface of the nozzle 6. The spatter 12 thus deposited is blown out of the welding torch 1.

[0005]

In the method for crushing and removing the spatter 12 deposited between the nozzle 6 and the contact tip 2 by the cutting tool 61 as described above, the spatter 12 itself is also rotated by the rotation of the cutting tool 61. And the outer periphery of the tip having the orifice 3 of the shield gas injection section 5 and the nozzle 6
Risk of damage. Further, there is a disadvantage that the crushed spatter 12 blocks the orifice 3, which causes a defective supply of a shield gas during welding, and that a welding defect is easily generated.

Further, in the method of blowing compressed air from the intermediate portion of the nozzle 6 to blow out the sputter 12 deposited between the nozzle 6 and the contact tip 2, it is not possible to blow out the sputter that has largely deposited, and the shield gas It has been difficult to blow out the sputter deposited on the deepest part of the nozzle 6 near the orifice 3 of the injection part 5. Further, there is a risk that the sputter deposited near the orifice 3 may block the orifice 3 with the pressure of the compressed air. If spatters that have accumulated so much or spatters remaining near the orifice 3 remain, or if the orifice 3 is blocked by spatter, poor supply of shield gas will occur during welding, and welding quality will be significantly deteriorated. Furthermore, in order to attach a compressed air supply pipe to the middle part of the nozzle 6,
There is also a disadvantage that the welding torch itself has a large volume and is difficult to handle.

An object of the present invention is to provide a method for removing spatter which can easily and surely remove spatter deposited in a welding torch. SUMMARY OF THE INVENTION Is what you do.

[0008]

SUMMARY OF THE INVENTION A welding tongue according to the present invention is provided.
A method of removing spatter from a tip includes a shield gas injection unit having a plurality of orifices on the outer periphery of a tip where a hollow contact tip is attached and a rear end connected to a shield gas conduit, and a contact tip and a shield gas injection. A shield gas supply pipe and a compressed air supply pipe are connected via a flow direction switching valve to a shield gas pipe of a welding torch having a nozzle for covering the part, and when the spatter is removed, the shield gas supply pipe is connected to the compressed air supply pipe. Compressed air is supplied into the nozzle from a plurality of orifices provided in a shield gas injection section of the welding torch to blow out spatter deposited in the nozzle.

[0009]

DETAILED DESCRIPTION OF THE INVENTION A welding torch according to the present invention has a hollow contact tip, a contact tip attached thereto, a plurality of orifices on the outer periphery of the front end, and a seal at the rear end.
A shield gas injection unit connected to the shield gas conduit; and a nozzle covering the contact tip and the shield gas injection unit. The shield gas conduit is connected to the shield gas supply pipe and the compressed air supply pipe via a flow direction switching valve composed of, for example, a shuttle valve.

In order to remove spatter deposited in the welding torch, compressed air is supplied to the compressed air supply pipe to switch the inlet of the flow direction switching valve to supply compressed air to the welding torch. Compressed air is injected into the nozzle from a plurality of orifices provided in the shield gas injection section of the torch, and spatter deposited in the nozzle is blown out of the nozzle to be removed.

[0011]

FIG. 1 is a block diagram of a welding torch and a piping system according to an embodiment of the present invention. The welding torch 1 shown in the figure has exactly the same configuration as the conventional example shown in FIG. 4, and has a hollow contact tip 2 and a plurality of orifices 3 attached to the contact tip 2 at the outer periphery of the front end. It has a shield gas injection unit 5 whose part is connected to the shield gas conduit 4, and a nozzle 6 that covers the contact tip 2 and the shield gas injection unit 5. The shield gas conduit 4 is connected to a shield gas supply pipe 21 having an electromagnetic valve 20 and a compressed air supply pipe 23 having an electromagnetic valve 22 via a flow direction switching valve 24. The flow direction switching valve 24 is composed of, for example, a shuttle valve, and is controlled by the pressure at the inlet to which the shield gas supply pipe 21 is connected and the pressure at the inlet to which the compressed air supply pipe 23 is connected.
A valve for automatically connecting one of them to the outlet to which the shield gas conduit 4 is connected, which closes the low pressure side inlet and connects the high pressure side inlet to the outlet. The solenoid valves 20 and 22 are opened and closed by a control signal from the control device 25. The shield gas supply pipe 21 has a flow rate of, for example, 10 to 25 liters / minute.
Compressed air is supplied to the compressed air supply pipe 23 at a pressure higher than the pressure of the shield gas, for example, a pressure of about 10 kgf / cm ² .

When a welding operation is performed with the welding torch 1 configured as described above, the control device 25 controls the compressed air supply pipe 2.
The electromagnetic valve 20 of the shield gas supply pipe 21 is opened with the electromagnetic valve 22 of No. 3 closed. When the solenoid valve 20 is opened, the shield gas is sent to the flow direction switching valve 24, and the compressed air supply pipe 23 is connected by opening the inlet of the flow direction switching valve 24 to which the shield gas supply pipe 21 is connected. The inlet is closed and the shield gas is supplied to the welding torch 1.
The shield gas supplied to the welding torch 1 is injected from a shield gas injection unit 5 and slides inside the contact tip 2 so that the arc of the welding wire 11 sent out at a constant speed and the molten metal are converted into air. Shield from

When removing the spatter 12 deposited in the welding torch 1 by performing the welding operation for a long time or repeatedly,
The controller 25 opens the electromagnetic valve 22 of the compressed air supply pipe 23 and sends compressed air having a pressure of about 10 kgf / cm ² to the flow direction switching valve 24. When compressed air having a pressure of about 10 kgf / cm ² is sent to the inlet to which the compressed air supply pipe 23 is connected, the flow direction switching valve 24 opens the inlet to which the compressed air supply pipe 23 is connected to supply the shield gas. The inlet to which the pipe 21 is connected is closed. As described above, since the flow direction switching valve 24 automatically closes the inlet connected to the shield gas supply pipe 21 when the compressed air is sent, mixing of the shield gas and the compressed air can be prevented. The spatter removing operation can be easily performed during the idling time of the welding operation.

The compressed air sent to the flow direction switching valve 24 is sent to the welding torch 1, and the space in which the sputter 12 is deposited from the orifice 3 of the shield gas injection unit 5, that is, the contact tip 2 and the orifice 3. The gas is injected into the space formed by the gas injection part 5 and the inner surface of the nozzle 6.
The sputter 12 deposited by the injection of the compressed air is blown out of the nozzle 6 and removed. As described above, since the compressed air is injected from the orifice 3 of the shield gas injection unit 5, the spatter 12 deposited near the orifice 3 can be reliably removed and clogging of the orifice 3 can be prevented. In addition, since compressed air having a pressure of about 10 kgf / cm ² is jetted, spatter 12
Can be easily blown out in a short time.

When the operation of removing the spatter 12 is completed, the controller 25 closes the electromagnetic valve 22 of the compressed air supply pipe 23 to shut off the compressed air supplied to the flow direction switching valve 24. When the supply of compressed air is cut off, the flow direction switching valve 24 closes the inlet connected to the compressed air supply pipe 23 and opens the inlet connected to the shield gas supply pipe 21 to the welding torch 1. Supply shield gas.

For example, FIG. 2 shows the result of examining the amount of spatter remaining in the welding torch 1 when the spatter generated by performing welding for a predetermined time at a welding current of 130 A is removed with compressed air injected from the orifice 3. Show. Also, as shown in FIG. 7, when the spatter remaining on the welding torch 1 by welding under the same conditions is removed by supplying compressed air having a pressure of about 5 kgf / cm ² from the middle of the nozzle 6, The amount of spatter remaining on the welding torch 1 is shown in FIG. 3 as a comparative example. As shown in FIG. 3, when compressed air at a pressure of about 5 kgf / cm ² was supplied and removed from the middle part of the nozzle 6, about 30% of the generated spatter remained, but the pressure was reduced to about 10 kgf / cm ^2. When the compressed air was sprayed from the orifice 3 for about 2 seconds to perform the spatter removal operation, all the spatter deposited on the welding torch 1 could be removed as shown in FIG.

In the above embodiment, the case where the spatter removing operation is performed by supplying the compressed air is described. However, an inert gas such as a nitrogen gas may be used instead of the compressed air. Also, the case where compressed air having a pressure of about 10 kgf / cm ² is used has been described, but the effect is obtained even if the pressure of the compressed air is 8 kgf / cm ² or more.

In the above embodiment, the flow direction switching valve 24 is used.
The case where a shuttle valve was used was described as
An electromagnetic valve may be used as the flow direction switching valve 24.

[0019]

As described above, according to the present invention, when removing the spatter deposited in the welding torch, the welding torch is removed.
Compressed air is injected into the nozzle from a plurality of orifices provided in the shield gas injection part of the switch to blow out the sputter deposited in the nozzle to the outside of the nozzle to remove spatter deposited near the orifice. It is possible to reliably remove and prevent clogging of the orifice.

Further, since compressed air is injected into the nozzle from the plurality of orifices provided in the shield gas injection section, large deposited spatter can be easily blown out, and the action of removing spatter can be reliably performed in a short time. It can be carried out. Therefore, spatter can be removed during the idling time of the welding operation, and there is no need to interrupt the welding operation for removing the spatter, thereby improving the efficiency of the welding operation and performing high-quality welding.

Further, since compressed air is injected into the nozzle from a plurality of orifices provided in the shield gas injection section, the nozzle and the contact tip are cooled together with the nozzle and the contact tip by the injected compressed air. Can also be reduced from adhering spatter to the surroundings.

Further, since compressed air is supplied using the shield gas conduit of the welding torch, it is not necessary to process the welding torch itself, and it is possible to reliably remove spatter at low equipment cost. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a welding torch and a piping system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a sputter generation amount and a residual amount according to the embodiment.

FIG. 3 is an explanatory diagram showing a sputter generation amount and a residual amount according to a conventional example.

FIG. 4 is a sectional view showing a welding torch.

FIG. 5 is a perspective view showing a welding construction state in an upward posture.

FIG. 6 is a cross-sectional view showing a conventional method for removing spatter.

FIG. 7 is a cross-sectional view showing another conventional sputter removal method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding torch 2 Contact tip 3 Orifice 4 Shield gas conduit 5 Shield gas injection part 6 Nozzle 20 Solenoid valve 21 Shield gas supply pipe 22 Solenoid valve 23 Compressed air supply pipe 24 Flow direction switching valve

Claims (1)

[Claims] 1. A shield gas injection section having a plurality of orifices at the outer periphery of a tip to which a hollow contact tip is attached and a rear end connected to a shield gas conduit, and a contact tip and a shield gas injection section. A shielded gas supply pipe and a compressed air supply pipe are connected to a shielded gas pipe of a welding torch having a covering nozzle via a flow direction switching valve, and compressed air is supplied to the compressed air supply pipe when spatter is removed. And supplying compressed air into the nozzle from a plurality of orifices provided in a shield gas injection portion of the welding torch to blow out spatter accumulated in the nozzle. Spatter removal method.