JPS633747Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a TIG welding torch used for welding materials having a narrow gap angle.

When welding thick plates as thick as 100 mm, if the groove angle of the material to be welded is large, the amount of wire consumed will increase and the welding time will be longer. It is desirable to form the gap first and perform narrow gap welding.

However, when the plate is thick like the one mentioned above and the groove angle is narrow at 10° to 15°, the continuous flow of inert gas that is ejected into the groove is disturbed and air tends to get mixed into the welding area. Become. As a result, weld defects such as blowholes and poor fusion occur at welded locations, resulting in poor welding.

Therefore, the inventor developed a TIG system that completely shuts off the atmosphere even in narrow gaps and protects the welding area, making essential welding possible.
We have already proposed a welding device (Patent Application No. 53-155285).

However, although the above method is effective for welding materials that have a narrow groove with a groove angle of about 10° to 15° in thick plates of 100 mm or more, When used for welding materials to be welded, there is a problem that welding becomes impossible because the torch main body cannot be inserted into the groove.

This idea was made to solve the above problem, and by making the effective part of the torch body that is inserted into the narrow gap thin, the bevel angle can be reduced to an extremely narrow gap of 5 degrees or less. It is an object of the present invention to provide a TIG welding torch that can easily perform proper welding even on formed thick plates.

Hereinafter, embodiments of this invention will be described based on the drawings.

In Fig. 1, 1 is the TIG welding torch body;
Reference numerals 2 and 2 denote side shield nozzles, which are disposed close to the front and rear of the torch body 1 and are integrally fixed to the torch body 1 by a tightening member 3.

As is clear from FIG. 2, the side shield nozzles 2, 2 have an effective portion _2a inserted into a narrow gap extending in the front-rear direction with a thin wall t2, and an inert gas passage 4 inside the body. A cooling water circulation path 5 is formed.

The gas passage 4 includes a plurality of gas ejection holes 6 that open toward the torch body 1 at the tip of the effective portion 2a, a plurality of gas ejection holes 7 that open toward both sides, and a plurality of gas ejection holes that open toward the bottom. It communicates with the jet hole 8.

Reference numeral 9 denotes an annular gas cylinder, which is slidably fitted onto the side shield nozzles 2, 2 in the axial direction;
An opening 10 is provided at the bottom, and a gas diffusion net 11 is stretched over this opening 10.

Reference numeral 12 denotes a skirt, which is made of a flexible metal thin plate such as stainless steel, and is connected to the annular gas cylinder 9.
It is connected to a hanging cylinder 13 provided in the side shield nozzles 2, and is adapted to enclose a gas flow ejected from the opening 10 toward the outer periphery of the side shield nozzles 2, 2.

As is clear from FIG. 3, the TIG welding torch main body 1 has a maximum wall thickness (hereinafter simply referred to as wall thickness) _t1 of the effective portion 1a inserted into the narrow gap between the side shield nozzles 2, 2. The wall thickness t ₂ of the effective part 2a of
It is formed to a thickness equal to or less than that.
Then, an electrode 1 fixed to the tip of the effective portion 1a
By surrounding the outer periphery of 4, as shown in Fig. 4,
Multiple gas ejection holes 1 that eject inert gas downward
5 are concentrically formed at least once around the torch body 1, and these gas ejection holes 15 communicate with an inert gas passage 16 formed inside the torch body 1.

In the figure, reference numeral 17 denotes a cooling water circulation path formed in the torch body 1, which is arranged adjacent to the inert gas passage 16 in the front-rear direction and extends to the vicinity of the electrode 14, that is, the vicinity of the tip of the torch body 1. There is. 18 is a wire.

In the above configuration, the effective portion 1 of the torch body 1
a, that is, the wall thickness t ₁ of the portion inserted into the narrow gap described later, is the wall thickness t _{2 of the side shield nozzles 2, 2.}
As it is clear from Figure 5, the extremely narrow groove B of 5° or less formed in the welded materials A and A with a thickness of 100 mm or more On the other hand, the effective parts 1a, 2a of the torch body 1 and the side shield nozzles 2, 2 can be easily inserted. What is important here is that the inert gas passage 16 and the cooling water circulation passage 17 are arranged adjacent to each other in the front and back. As a result, the torch main body 1 could be made thin.

Therefore, the torch body 1 and the inside of the extremely narrow groove B,
After inserting the side shield nozzles 2, 2 and setting the welding equipment so that the inner surface of the skirt 12 comes into contact with the upper surface of the materials to be welded A, the extremely narrow groove B is
While moving the device along the torch body 1
An inert gas flow is ejected from the gas ejection holes 15 of the side shield nozzles 2, 2 so as to cover the welding area to expel and block the atmosphere, and is also ejected from the gas ejection holes 6, 7, and 8 of the side shield nozzles 2, 2. The gas flow forms an inert gas curtain around the outer periphery of the torch body 1, expels the atmosphere, replaces the inside of the extremely narrow groove B with a complete inert gas atmosphere, and further closes the skirt 12.
By coating the outside of the side shield nozzles 2, 2, and by flowing the inert gas ejected from the opening 10 downward from the inside of the skirt 12, the outer periphery of the side shield nozzles 2, 2 is also covered. Since an active gas curtain is formed, proper welding without missing any welding is possible. In addition, since the torch body 1 is cooled by the cooling water in the circulation path 17, consumption of the electrode 14 is suppressed, and stable TIG welding within a narrow gap of a thick plate is realized.

As explained above, this idea is to set the thickness of the effective part of the TIG welding torch body to be equal to or less than the thickness of the side shield nozzle, and to surround the outer periphery of the electrode to form the gas nozzle. At the same time, a cooling water circulation path was installed in the torch body adjacent to the inert gas passage that communicates with the gas ejection hole, allowing for proper welding of thick plates with extremely narrow grooves. There are advantages to being able to do so.

[Brief explanation of the drawing]

Figure 1 is an overall front view of the TIG welding device to which this invention is applied, Figure 2 is a side view of the side shield nozzle, Figure 3 is a side view of the torch body according to this invention, and Figure 4 is an enlarged bottom view of the same. FIG. 5 is an explanatory diagram of the state of use. 1... TIG welding torch body, 1a... Effective part, 2, 2... Side shield nozzle, 2a...
Effective part, 6, 7, 8...Gas outlet, 9...Annular gas cylinder, 14...Electrode, 15...Multiple gas outlet holes, 16...Inert gas passage, 17...Cooling water circulation path.

Claims (1)

[Claim for Utility Model Registration] A TIG welding torch body that holds an electrode at the tip, a pair of front and rear side shield nozzles disposed close to the front and rear of this torch body, and these side shield nozzles. The side shield nozzle is equipped with an annular gas cylinder fitted externally so as to be slidable in the upper and lower axial directions. In a TIG welding torch, the tip of the effective part is provided with a gas nozzle opening toward the torch body, a gas nozzle opening toward both sides, and a gas nozzle opening downward. , A plurality of gas ejection holes are concentrically formed at least once around the tip of the torch body to blow out inert gas downward by surrounding the outer periphery of the electrode held at the tip, and , An inert gas passage supplying inert gas to the plurality of gas ejection holes and a cooling water circulation path extending to the vicinity of the tip of the torch body are adjacent to each other in the front and back inside the body of the torch body. A TIG welding torch, wherein a maximum wall thickness of at least an effective portion of the torch body is set to be equal to or less than a maximum wall thickness of an effective portion of the side shield nozzle.