JPS605988Y2 - Plasma welding torch electrode - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrode for a plasma welding torch.

A conventional welding torch of this type is shown in FIG.

That is, in the figure, an electrode 1 is attached to an electrode holder 2, and a pipe 3 is inserted into the holder 2 to cool the electrode 1 with water, and cooling water 4 is flowed therethrough for direct cooling.

The electrode holder 2 has a structure that allows it to be moved up and down by rotating the insulating ring 5, and the distance between the tip 6 and the tip of the electrode 1 is A.
1, that is, to adjust the setback A.

A centering bush 7 made of an insulator is inserted into the chip 6 to prevent short circuit between the electrode 1 and the chip 6, and is tightened to the chip body 8, and a shield nozzle 9 is inserted into the chip 6.
is attached to chip body 8.

In the electrode 1, in which the tungsten 10 and the hollow copper rod 11 are brazed in the middle, the tip of the tungsten 10 becomes rounded as it wears out.

When using this electrode 1 again, tungsten 10
As shown in Figure 2, the distance from the tip of the tungsten 10 to the clamping part of the electrode 1 is shortened by the dimension of the polished tungsten 10. When tightened to the holder 2, the setback A becomes longer.

Therefore, by rotating the insulating ring 5, the setback A
must be adjusted to its original length.

However, since this type of plasma welding torch is generally built into an automatic welding device, it is difficult to adjust it online, and there is also a drawback that variations in the adjustment of setback A occur, resulting in variations in welding results. .

In this invention, the electrode tightening part is a double nut type, and the distance from the tip of the electrode to the flange surface formed by the double nut can be adjusted. After setting the distance to a constant value off-line, the plasma welding torch is By assembling, it is possible to eliminate online setback adjustment and thereby stabilize welding quality. An example of this will be explained with reference to Figs. 3 and 4. do.

Electrode 1 is made of tungsten 10 and hollow copper rod 1 as described above.
As shown in Fig. 4, a double nut 12 is attached to the attachment part of the electrode 1.
are screwed together in an adjustable manner to form a flange surface on the mounting portion with this double nut 12.

That is, the length L of the electrode 1 is the end face of the two nuts 12 (
flange surface) to the electrode tip, and is therefore determined by the tightening position of the nut 12.

This electrode 1 is attached to an electrode holder 2 as shown in FIG.
A pipe 3 installed inside the electrode holder 2
It is directly cooled by cooling water 4 circulating through the interior of the .

Cooling water 4 is sealed by O-ring 13.

The chip 6 is attached to the chip body 8, and its cooling channel is connected to O.
Seal is provided by rings 14 and 15.

The cooling water 4 circulates inside the electrode 1, cools the chip 6, and flows out.

9 is a shield nozzle, which is attached to the outer periphery of the chip body 8.

A centering bush 7 maintains the concentricity of the electrode 1 and the tip 6 and insulates them.

Note that the electrode holder 2 is fixed to the torch body 16 and does not move up and down.

The electrode 1 configured as shown in FIGS. 3 and 4 is
First, when the electrode 1 is worn out by welding, the electrode 1 is removed from the torch and the tungsten 10 portion at the tip is polished.

After polishing, use a jig etc. to remove the nut 1 from the tip of the electrode 1.
Set the distance to the end face of 2 to a predetermined length.

In this way, when replacing the electrode, there is no need to adjust the electrode holder 2 by the dimension of the polished electrode, as is the case with the conventional method, so that the setback A is always kept constant.
No welding defects occur due to adjustment errors.

As mentioned above, in the electrode of the plasma welding torch of the present invention, a double nut is adjustably screwed into the attachment part to the electrode holder to form the flange surface of the attachment part. As mentioned above, when the electrode is worn out, remove it from the torch, polish the tungsten part at the tip, use a waist jig, etc. to make the distance from the electrode tip to the end face of the nut a specified length, and attach it to the electrode holder. Once installed, the polished dimensions have already been adjusted and will have a predetermined setback. Therefore, the setback will always be kept constant and no welding defects will occur due to adjustment errors.

Further, since the adjustment is done using a nut, fine adjustment is possible, and since the nut is a double nut, once it is adjusted and set, it will not come loose inadvertently.

[Brief explanation of drawings]

Figure 1 is a front sectional view of a conventional plasma welding torch, Figure 2 is a front sectional view of a conventional plasma welding torch.
The figure is a front view of the electrode shown in FIG. 1, FIG. 3 is a front sectional view showing an embodiment of the present invention, and FIG. 4 is a front view of the electrode shown in FIG. 1... Electrode, 2... Electrode holder, 6...
...Tip, 7...Centering bush, 8...Chip body, 9...Shield nozzle, 10...Tungsten, 11...
...Hollow copper rod, 12...Double nut.

Claims (1)

[Scope of utility model registration request] A hollow copper rod and a tungsten electrode are brazed to each other, and the double nut is adjustably screwed to the attachment part of the electrode holder to form a flange surface of the attachment part, and the double nut extends from the tip of the electrode. An electrode for a plasma welding torch, characterized in that the electrode is fastened to the electrode while maintaining a constant distance to the flange surface formed by a double nut.