JPS6016459Y2 - Arc welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for controlling the feed speed of filler wire in a TiG welding device.

A conventional device of this type is shown in FIG.

In the figure, 1 is a TIG welding power source with a wire feeding function, 2 is a trigger switch that is the first operation switch,
3 is a wire inching switch which is a second operation switch; 4 is a start relay that is excited and driven when trigger switch 2 is turned on; 5 is an inching relay that is excited and driven when wire inching switch 3 is turned on; 6 is a welding control circuit. ,
If you create a welding sequence such as a crater function, it will cause gaps.
Generates a phase control signal according to the output setting value.

7 is a normally open starting contact of the starting relay 4, and 8 is a normally open inching contact of the inching relay 5, each of which is input to the welding control circuit 6.

Reference numeral 9 denotes a main circuit, which includes a power pressure regulator, a phase controller, a high frequency generator, etc., and receives the above-mentioned phase control signal, etc. as input, and generates an output corresponding to the input signal.

10 is a wire feeding speed setting device which is a first speed setting device for setting the feeding speed of the wire; 11 is a wire feeding circuit;
It is driven upon receiving a command to start feeding from the welding control circuit 6, and generates an output according to the setting value of the speed setting device 10.

12 is a wire feeding device which receives the output of the wire feeding circuit 11, rotates a built-in motor, and uses its driving force to
Feed the wire.

A welding torch 13 is connected to one end of the output of the main circuit 9, and fixes the trigger switch 2 and wire inching switch 3.

Reference numeral 14 denotes an object to be welded, to which the other end of the output of the main circuit 9 is connected.

Reference numeral 15 denotes a 'twear guide, which is fixed to the welding torch 13.
This is for determining the aim so that the wire sent from the wire feeding device 12 through the conded cable 16 is inserted between the welding torch 13 and the workpiece 14.

Next, the operation will be explained.

A welding sequence with a crater function will be described below.

When the trigger switch 2 is pressed, the start relay 4 is energized and the normally open start contact 7 is closed.Then, the welding control circuit 6 starts its function.By sending commands and phase control signals to the upper circuit 9, the welding torch 13 and the target are connected. A high frequency current flows between the workpiece 14 and the workpiece 14, and as a result an arc is generated.

After the arc occurs, when the normally open start contact 7 is opened by releasing the trigger switch 2 and stopping the excitation of the start relay 4, a command is issued from the welding control circuit 6 to the wire feeding circuit 11 to start wire feeding. A drive output corresponding to the set value of the speed setting device 10 is generated in the wire feeding circuit 11 and drives the motor of the wire feeding device 12, thereby passing the welding torch 13 through the conded cable 16 and wire guide 15.
A wire is supplied into the arc generated between the welding object 14 and the welding object 14, and the wire is melted into the welding object 14 to perform welding.

Next, when the trigger switch 2 is pressed again, the normally open start contact 7 is closed in the same way, a command is issued from the welding control circuit 6, the output of the main circuit S is switched to the crater condition 1, and the wire feed is resumed. The output of circuit 11 is stopped.

As a result, the wire supply is stopped and the welded object can be cratered.

Next, when the trigger switch 2 is released again, an output stop command is issued from the welding control circuit 6, the output of the main circuit 9 is stopped, and the arc is extinguished.

In this way, a series of TIC welding is completed.

Also, when replacing the wires and ears of the wire feeding device 12, when the wire is filled with new wire and the wire inching switch 3 is pressed, the inching wire L/-5 is excited and driven.
As a result, the inching normally open contact 8 closes, and the welding control circuit 6
According to the command from the wire feeding circuit 11 or drive 17, a drive output according to the setting value of the wire feeding speed setting device 10 is generated to drive the motor of the wire feeding device 12. The wire can be fed out through the wire guide 15 and ready for the next weld.

Since the conventional arc welding apparatus is constructed as described above and has a tail, the wire feeding speed during welding and during wire inching is the same.

Generally, in order to complete wire filling as quickly as possible during inching, the wire feeding speed setting is set only during inching and then returned to the optimum feeding speed during waist welding.

This has the disadvantage that it is a redundant process and at the same time, the optimal feed rate value must be found again.

Another drawback is that even if there is, for example, a large gap in the workpiece during welding and it is desired to temporarily feed a large amount of wire, this is not possible unless the wire feeding speed is changed.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing an inching speed setting device separately from the wire feeding speed setting device described above, the wire inching switch can be operated during welding or non-welding. When pressed, the wire is fed according to the setting value of the inching speed setting device, so it is possible to set a wire inching speed faster than the wire feeding speed during welding, and at the same time, it is possible to temporarily feed a large amount of wire during welding. The purpose is to provide an arc welding device that can feed

An embodiment of the present invention will be described below with reference to the drawings.

21 is an inching speed setting device which is a second speed setting device, and 22 is an inching normally closed contact of the inching relay 5, which connects the wire feeding circuit 11 and the setting terminal of the wire feeding speed setting device 10. .

Reference numeral 23 denotes an inching normally open contact of the inching relay 5, which connects the wire feeding circuit 11 and the setting terminal of the inching speed setting device 21.

Other same symbols are the same as in Fig. 1.

The case of a welding sequence having a crater function will be described below.

When the trigger switch 2 is pressed, the start relay 4 is excited and driven, and the normally open start contact 7 is closed.

Then, the welding control circuit 6 starts functioning, sends commands and phase control signals to the main circuit 9, and controls the welding torch 13 and workpiece 14.
A high frequency current flows between the two, resulting in an arc.

After the arc occurs, the trigger switch 2 is released 7 to stop the excitation of the start relay 4, and the normally open start contact 7 is opened (and a command is issued from the welding control circuit 6 to the wire feed circuit 11, A driving output corresponding to the set value of the wire feeding speed setting device 10 is generated in the wire feeding circuit 11 and drives the motor of the wire feeding device 12, thereby welding is carried out through the conded cable 16 and the wire guide 15. torch 13
Welding is performed by feeding a wire into the arc generated between the wire and the workpiece 14 and melting it into the workpiece 14.

Next, when the trigger switch 2 is pressed again, the normally open start contact 7 closes and a command is issued from the welding control circuit 6.
The output of the main circuit 9 is switched to the crater condition, and the output of the wire feeding circuit 11 is stopped.

As a result, the supply of wire is stopped and the workpiece 14 to be welded can be cratered.

Next, when the trigger switch 2 is released again, the welding control circuit 6
An output stop command is issued from the main circuit 9, and the output of the main circuit 9 is stopped and the arc disappears.

In this way, a series of TIG welding is completed. Also, regardless of whether welding or non-welding, when the wire inching switch 3 is pressed, the inching relay 5 is excited and driven, and as a result, the inching normally open contact 8 is closed, and the command from the welding control circuit 6 is The wire feeding circuit 11 is driven (already driven during welding), but since the inching normally open contact 23 is closed and the inching normally closed contact 22 is open, the drive output at this time is the same as that of the inching speed setting device. 21
The value corresponds to the setting value.

- If the setting value of the inching speed setting device 21 is appropriately larger than the setting value of the wire feeding speed setting device 10, when replacing the wire of the wire feeding device 12, etc., insert a new wire and press the wire inching switch. When you press 3, the wire is fed quickly and ready for the next welding, and there is no need to change the wire feeding speed during welding.

Also, if there is a large gear or the like on the workpiece 14 during welding and you want to temporarily increase the wire feed amount, press the wire inching switch 3 to quickly feed the wire and do the above. It can fill in large gaps.

FIG. 3 is drawn to make these sequences easier to understand.

31 indicates the operation of the trigger switch 2.

32 indicates the operation of the wire inching switch 3.

33 indicates the output of the main circuit 9, 33a indicates the output during main welding, and 331) indicates the output during crater welding.

34 indicates the wire feeding speed.

Reference numeral 34a indicates a feeding speed corresponding to the setting value of the wire feeding speed setting device 10, and 34b indicates a feeding speed corresponding to the setting value of the inching speed setting device 21.

In this embodiment, the wire feeding circuit 11 is described as being built into the TIG welding power source 1, but even if it is not built into the TIG welding power source 1, the effect will not change in any way.

In addition, as shown in FIG. 4, if the setting terminal of the inching speed setting device 21 and the other end are connected with the normally closed contact 41 for current detection, if the wire inching switch 3 is pressed during non-welding, the wire inching switch 3 is pressed at the maximum feeding speed. The wire can be fed, and if you press the wire inching switch 3 during welding, the inching speed setting device 21
Wire can be fed at any feeding speed set in
Suitable for feeding at maximum speed only when replacing wires.

As described above, according to the present invention, the inching speed setting device 21 is provided separately from the wire feeding speed setting device 10, and the wire inching switch 3 is provided regardless of whether welding or non-welding.
By pressing , the wire is fed according to the setting value of the inching speed setting device 21, and the wire feeding amount can be changed temporarily not only when replacing the wire but also during welding, thereby preventing welding defects. This has the effect of preventing the occurrence of such occurrences.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional arc welding device, Fig. 2 is a block diagram showing an arc welding device according to an embodiment of the present invention, and Fig. 3 is an operation sequence showing an operation sequence according to an embodiment of the present invention. The explanatory diagram, FIG. 4, is a configuration diagram showing another example of application of this invention. In the drawings, the same reference numerals indicate the same or equivalent parts, 2 is the first operation switch, 3 is the second operation switch, 10 is the first operation switch, and 10 is the first operation switch. 21 indicates a second speed setter.

Claims (3)

[Scope of utility model registration request] (1) A welding torch equipped with a non-consumable electrode that generates an arc between it and the workpiece, a wire feeding device that supplies filler wire to this welding torch, and a first operation that operates arc starting etc. a switch, a second operation switch for operating filler wire inching, etc., a main circuit for supplying electric power to generate an arc between the workpiece and the welding torch, and a wire feeding device for controlling the wire feeding device. outputting a signal for controlling the main circuit and the wire feeding circuit in accordance with the operation of the feed circuit and the first operation switch, and the second operation switch regardless of the operation of the first operation switch; and a welding control circuit that outputs a signal for controlling the wire feeding circuit in response to an operation of the wire feeding circuit, wherein a first speed setting sets a filler wire feeding speed of the wire feeding device during normal welding. a second speed setting means for setting the filler wire feeding speed of the wire feeding device at times other than normal welding such as during filler wire inching; means for switching the operation of the second speed setting means, and during normal welding based on the operation of the first operation switch, the wire feeding circuit feeds the wire set by the first speed setting means. The wire feeding device is controlled based on the speed, and at times other than normal welding such as during wire inching based on the operation of the second operation switch, the wire feeding circuit is set by the second speed setting means. An arc welding device characterized in that a wire feeding device is controlled based on a wire feeding speed determined by the wire feeding speed. (2) The arc welding apparatus according to claim 1, wherein the first operation switch is a welding torch or a built-in trigger switch. (3) The arc welding device according to claim 1 or 2, wherein the second operation switch is fixed to or built into the welding torch.