JP2811932B2 - TIG arc welding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a TIG arc welding method in which a single TIG welding machine can perform welding using a plurality of torches.

[Prior Art] Conventionally, when performing TIG arc welding using a plurality of torches, as shown in FIG. 4, a plurality of TIG welding machines 1 are provided, and a torch 2 is connected to each of the welding machines 1. Welding was done.

[Problems to be Solved by the Invention] By the way, when welding is performed by the above-mentioned conventional method,
The current used for welding was in a current band considerably lower than the current capacity of the TIG welding machine 1, and the function of the welding machine 1 was not fully utilized.

Further, even if an attempt is made to connect two torches 2 to one welding machine 1 in order to make full use of the functions of the welding machine 1, if one of the torches 2 is ignited, the other torch 2 will be ignited. could not.

The present invention has been made in order to solve the above problems, and an object of the present invention is to connect a plurality of torches to one TIG welding machine to perform welding, and to sufficiently improve the function of the welding machine. It is to provide a TIG welding method that can be utilized.

[Means for Solving the Problems] In order to solve the above object, the present invention relates to connecting a plurality of torches to one TIG welding machine and performing welding independently with each torch. The tip of the electrode is brought into contact with the member to be welded to generate an arm column, the tip of the electrode of one torch is tilted, and then the tip of the electrode of the other torch is tilted toward the tip of one electrode, and the tip of the electrode of the other torch is tilted. Is brought into contact with the above-mentioned arc column atmosphere and fired, and then each of the torches thus fired is moved to each welded portion while being held by the arc column to perform welding.

[Operation] According to the above configuration, after firing one torch, the electrode tip of one torch and the electrode tip of another torch are each tilted, and the electrode tip of each torch is approached,
By bringing the tip of the electrode of the other torch into contact with the atmosphere of the arc column of the torch and igniting it, arc columns can be generated from both torches at the same time, and each torch is welded while maintaining its state. By moving to the part and welding, a plurality of torches can be connected and used by one TIG welding machine.

As a result, the function of the welding machine can be fully utilized, and the operation rate of the TIG welding machine can be significantly improved as compared with the conventional welding method.

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

FIG. 2 shows a TIG welding equipment for carrying out the method of the present invention.

In the drawing, reference numeral 1 denotes a TIG welding machine, and a plurality of torches (two in the illustrated example) are provided on the (-) side of the welding machine 1.
2 are connected via a cable 3, and these torches 2 are provided with electrodes 4 for generating an arc. Each of these torches 2 is connected to a gas supply pipe 7 for supplying inert gas for sealing the welded portion 6 of the member 5 to be welded and a cooling water supply pipe 8 for cooling the torch 2, and supplies power to the torch 2. Power cable 9
Are connected.

On the other hand, to the (+) side of the TIG welding machine 1, a member 5 to be welded is connected via a cable 10. The welding machine 1 is grounded via an earth cable 11.

In the figure, reference numeral 12 denotes a remote control for remotely adjusting and controlling the welding current of the torch 2, which is connected to the welding machine 1 via a cable 13.

Next, an embodiment of the method of the present invention will be described based on the operation diagrams of FIGS. 1A, 1B, 1C, and 1D using the TIG welding equipment of FIG.

When performing TIG welding, as shown in FIG.
A plurality of torches 2, for example, two torches 2a and 2b are connected to the (-) side of the welding machine 1, and a workpiece 5 is connected to the (+) side. Next, when welding is performed, one of the torches 2 is ignited. For example, as shown in FIG.
The electrode 4a of the torch 2a is fired by bringing the tip of the electrode 4a into contact with the member 5 to be welded, and then, as shown in FIG.
Of the torch 2b and the tip of the electrode 4b of the torch 2b.
Tilt to the tip side of 4a, and torch 2b on arc column 15a of torch 2a
The torch 2b is fired by bringing the tip of the electrode 4b into contact.

Each of the torches 2a and 2b thus ignited is shown in FIG.
As shown in the figure, after the arc columns 15a and 15b are held and moved to the respective welded portions 6 of the member 5 to be welded, welding may be performed while melting the molten material with the torches 2a and 2b.

During this welding, the welded portion 6 is sealed with inert gas ejected from each torch 2a, 2b, and each torch 2a, 2b is cooled with cooling water.

However, at the time of this welding, since two torches 2 are connected to one TIG welding machine 1, the maximum output current to each torch 2 is a current obtained by dividing the current capacity of the welding machine 1 by two. It is possible to perform sufficient welding with such a current, and the welding machine 1
Can be fully utilized.

As described above, since a plurality of torches 2 can be connected to one TIG welding machine 1 to perform welding, the functions of the welding machine 1 can be fully utilized, and the operating efficiency of the welding machine 1 can be improved. Can be improved.

FIG. 1 (D) shows a state in which the torches 2 are separated from each other. If the length of the arc column 15 of each torch 2 does not change even if the distance between the torches 2 is increased or decreased, the current is reduced. The welding can be performed in a state where the voltage is stable.

However, if the distance l between the torches 2 is less than 5 mm, the arc columns 15 of each torch 2 will converge, so it is not preferable to make the distance l too short. Therefore, the minimum clearance l during welding is preferably about 10 mm.

The distance between the torches 2a and 2b can be set to an appropriate distance (l = 10 to 20 m) on the maximum side within a range that does not hinder the device control.

Next, FIG. 3 shows an example in which the present method is applied to welding of pipes.

By the way, conventionally, when performing butt welding of pipes,
There is also a method in which one torch is positioned at the welded part of the pipe and welding is performed while rotating the pipe. However, if there is no such equipment, one torch is divided into two parts at 180 ° to the pipe. Welding method is adopted. In addition, 1
Welding is performed while moving the torch on the tube 360 ゜ 1 rotation, but the welding posture is upward or downward, so the welding current and movement of the torch are There is a problem that it is difficult to control the speed and the like, and cables such as a cable connected to the torch, a cooling water supply pipe, and a gas supply pipe are entangled to hinder the movement of the torch. In order to avoid these problems, in order to reduce the change in posture of the torch, it is common to move the torch upward from below and perform welding by 180 °.

In this embodiment, such butt welding of pipes is performed with high efficiency by employing the above-described method of the present invention. As shown in FIG. −)
Side, two torches 2 are connected via cables 17 such as a cable, a cooling water supply pipe, and a gas supply pipe, and a pipe 16 as the member to be welded 5 is connected to the (+) side, and then described above. In the method, each torch 2 is ignited and the ignited torch 2 is
16 while moving each torch 2 upward or downward in the direction indicated by the arrow at the same time or with a certain time lag,
What is necessary is just to melt and weld 18.

If the butt welding of the pipe 16 is performed in this manner, 2
The same welding efficiency as when welding with two torches 2 using two TIG welding machines 1 is obtained, and welding using two torches 2 with two welding machines 1 This means that the number of cables 17 connected to the torch 2 is reduced, the size can be reduced, and the cables 17 are not entangled.

Further, since welding is performed while moving two torches 2 in the same welding posture by one welding machine 1, the control of the current, the moving speed and the like of each torch 2 becomes the same, and the control is simplified.

[Effects of the Invention] According to the present invention, two torches can be used by one TIG welding machine, so that the functions of the welding machine can be fully utilized and the operating efficiency of the welding machine can be improved. Excellent effects such as improvement of

[Brief description of the drawings]

1 (A), 1 (B), 1 (C) and 1 (D) are action diagrams showing an embodiment of the method of the present invention, FIG. 2 is a schematic diagram showing one embodiment of a TIG welding equipment to which the present invention is applied, FIG. FIG. 3 is a view showing an embodiment in which pipes are welded by the method of the present invention, and FIG. 4 is a schematic view showing an example of a conventional method. In the figure, 1 is a TIG welding machine, 2 is a torch, 4 is an electrode, 5 is a member to be welded, 6 is a welded portion, and 15 is an arc column.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 9/00 109 B23K 9/095 B23K 9/167 B23K 9/067 B23K 9/12

Claims (1)

(57) [Claims] 1. A plurality of torches are connected to one TIG welding machine, and when welding is performed independently with each torch, an electrode tip of one torch is brought into contact with a member to be welded to generate an arc column. At the same time, the tip of the current of the torch is tilted, then the tip of the electrode of the other torch is tilted toward the tip of the one electrode, and the tip of the electrode of the other torch is brought into contact with the atmosphere of the arc column and fired. A TIG arc welding method, characterized in that each of the ignited torches is moved to each welded part while holding the arc column to perform welding.