JPS63295071A - Torch for welding fine bore pipe inside - Google Patents

Abstract

PURPOSE:To continuously perform the welding work by inserting a torch body into a gas supply pipe and a cooling water supply pipe and fixing its one end on a body main body having a cooling water passage and circulating cooling water in the torch body via a hole of the body main body to cool the torch body. CONSTITUTION:The cooling water supply pipe 16 whose one end is communicated with the cooling water passage 4 through an external ring 3 is fixed on the external ring 3 of the body main body 2. The gas supply pipe 17 is arranged in parallel with said cooling water supply pipe 16 and the torch body 18 where its one end is communicated with a shaft hole 2a of the body main body 2 through the external ring 3 and the body main body 2 is formed cylindrically and inserted into the outsides of the cooling water supply pipe 16 and the gas supply pipe 17. One end of said torch body 18 is fixed on the outside peripheral surface of the external ring 3 and moreover, a drainpipe 19 is fitted to its rear end face. Then, the cooling water supplied from the cooling water supply pipe 16 to the cooling water passage 4 flows in the torch body 18 with respect to the external ring 3. A communication hole 3a is opened. Accordingly, the body main body 2 and the torch body 18 can be cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a welding torch for an inert gas tungsten arc welder.

2. Description of the Related Art Conventionally, a water-cooled torch for inert gas tungsten arc welding (TIG welding), especially used for welding or overlaying the inner surface of thin pipes, is manufactured by the American company WELDCRAFT, as shown in Figure 7. There is a type welding torch.

In this figure, a welding torch 51 has a main body 52 of a predetermined length, and one end of this main body 52 is a lens body attachment part 53 inclined at an obtuse angle with respect to its axis. This lens body mounting portion 53 has a shaft hole 53a into which a gas lens body 55, which will be described later, is fitted, and the upper surface of this shaft hole 53a is closed.

The lens body mounting portion 53 has a double wall structure extending a predetermined length from the upper surface thereof, and the space between the walls forms a flow path (not shown) for cooling water. The lower part of the lens body attachment part 53 is the cylindrical part 5
4, a gas lens body 55 fitted with a collet 56 is fitted to an internal threaded part 54a formed on the inner peripheral surface of the cylindrical part 54, and a seal part 58 is mounted to an external threaded part 54b of the cylindrical part 54. A nozzle 57 is screwed in through.

Further, a cooling water supply pipe 59 and a cooling water discharge pipe 60 protruding from the other end of the body main body 52 are connected to the cooling water flow path of the lens body attachment portion 53, respectively. A gas supply pipe 61 for supplying inert gas is arranged in the main body 52 in parallel with the cooling water supply pipe 59. The distal end of the gas supply pipe 61 penetrates the cooling water flow path of the lens body attachment part 53 in a watertight manner and communicates with the upper part of the shaft hole 53a.

The torch 51 has a main body 52 covered almost entirely with heat-resistant rubber 62, and the main body 52 is covered with heat-resistant rubber 62.
A cylindrical torch body 63 is fitted onto the outside of the cooling water supply pipe 59, etc., as shown by a two-dot chain line.

Problems to be Solved by the Invention In the conventional torch 51 described above, the lens body mounting portion 53
Since the upper surface was closed, when gripping the electrode rod 64 inserted into the shaft hole of the collet 56 by screwing the gas lens body 55 into the cylindrical portion 54, the electrode rod 64
It is not easy to finely adjust the amount of protrusion from the tip of the gas lens body 55 to make it most suitable for overlaying, etc., and the tip of the electrode rod 64 has worn out, so the amount of protrusion cannot be adjusted. It wasn't easy either. Also, a cooling water supply pipe 59 and a cooling water discharge pipe 60 are provided for cooling the body main body 52 during welding or overlaying with the torch 51.
were provided separately, and the torch body 63 was not cooled by cooling water. For this reason,
The worker holds the torch body 63 and welds etc. for several minutes (
5 to 6 minutes), even if the worker is wearing heat-resistant gloves, the torch body 6 is heated by the welding heat.
There was a problem in that the user could no longer hold the item 3 and could not continue working.

In view of the above, this invention makes it possible to adjust the protruding length of the tip of the electrode rod from the tip of the gas lens body extremely easily and in a short time even when the electrode rod to be inserted into a small diameter tube is very short. It is an object of the present invention to provide a welding torch for use in small-diameter pipes, which can be used in small-diameter pipes and which can prevent the operator's hand gripping the torch body from becoming hot during welding or the like.

Means for Solving the Problems Means for solving the above problems will be explained using FIGS. 1 to 4, which correspond to embodiments.

A torch for welding in small-diameter pipes according to the first invention has a body having a threaded shaft hole 2a on the inner circumferential surface and a cooling water passage 4 between the outer ring 3 and the outer ring 3 fitted on the outer circumference.・One body 2, a collet cap 13 that loosely fits a collet 14 for gripping the electrode rod 11 into the shaft hole 2a and is airtightly screwed onto the threaded portion 2b of the body body 2 from above, and a collet cap 13 on the outer peripheral surface. Threaded mounting 7. It has a nozzle mounting part 8 and a lens part 9 having an appropriate number of gas blowing holes 10. When the mounting part 7 is screwed into the threaded part 2b of the body main body 2 from below, the lower inner surface of the lens part 9 is connected to the collet 14. collet 1 in contact with the lower end
a gas lens body 6 in which the electrode rod 11 is held by the gas lens body 4;
a nozzle 12 screwed onto the nozzle mounting portion 8 of the gas lens body 6; a cooling water supply pipe 16 penetrating the outer ring 3 from the outside in a watertight manner and communicating with the cooling water passage 4 of the body main body 2; An inert gas supply pipe 17 is arranged in parallel with the cooling water supply pipe 16 and penetrates the outer ring 3 and the main body 2 in a watertight manner to communicate with the inside of the gas lens body 6.
In a welding torch equipped with a welding torch, the torch is fitted on the outside of the inert gas supply pipe 17 and the cooling water supply pipe 16, and one end is fixed to the outer ring 3 in a watertight manner, and a hole 3a made in the outer ring 3 is fixed to the outside of the inert gas supply pipe 17 and the cooling water supply pipe 16. A torch body 18 is provided which communicates with the cooling water passage 4 of the body body 2 via the torch body 18, and a drain pipe 19 is attached to the torch body 18 and discharges the cooling water inside the torch body 18. The top surface of 2 is approximately the same as that of 2.

Further, the torch for welding inside a small diameter pipe according to the second invention is provided with a bracket 22 at the lower part of the torch body 18 of the torch for welding inside a small diameter pipe according to the first invention, and this bracket 22 includes:
A wire supply section 21 is provided below the electrode rod 11, which is formed by attaching a tip 25 for supplying the wire W through a tip guide 24.

Function: The torch for welding in small diameter pipes of the first invention has the upper surface of its collet cap substantially flush with the upper surface of the main body, so it can be inserted into narrow diameter pipes. When inserting into the torch body and applying current to the electrode rod from the cooling water supply tube to weld the butt part with another thin diameter tube, the cooling water that cooled the body flows into the torch body and the torch Since the body is cooled, the torch body does not get hot like conventional torches. Therefore, the worker can work continuously.

In addition, if the tip of the electrode rod is worn out due to welding and its position becomes inappropriate, loosen the threading of the collet cap onto the body and adjust the gripping position of the electrode rod by the collet. This allows the torch to be used in optimal condition at all times.

In addition, the torch for welding inside small diameter pipes according to the second invention has a wire supply section compared to the torch according to the first invention, so that it is possible to perform not only butt welding of small diameter pipes but also overlaying on the inner surface of the pipe. It is possible.

Embodiments Next, the present invention will be explained based on drawings showing embodiments.

1 to 4, a welding torch 1 has a main body 2. As shown in FIGS. This main body 2 has a cylindrical shape, and its shaft hole 2a is threaded to form a threaded portion 2b. The main body 2 has a groove 2C of a predetermined depth cut in the outer peripheral surface of the main body 2, leaving both ends thereof (see Fig. 2), and an outer ring 3 is fixed to the outer periphery of the main body 2 in a watertight manner. There is.

Therefore, the space formed by the groove 2C of the body main body 2 and the outer ring 3 serves as a cooling water flow path 4. Body main body 2
Further, a stepped portion 2d into which the seal 5 is fitted is formed at the upper end of the threaded portion 2b.

The gas lens body 6 has a cylindrical shape with a bottom and has a shaft hole (not shown) into which a collet 14 of a collet cap 13, which will be described later, is loosely fitted. This gas lens body 6 has a threaded mounting part 7 on its upper outer peripheral surface, which is screwed into the threaded part 2b of the body main body 2 from below.
Below this mounting part 7, there is a nozzle mounting part 8 which has a larger diameter than the mounting part 7 and into which a cylindrical nozzle 12 is screwed into a threaded part cut on the outer periphery. Below 8 is a lens section 9. The lens portion 9 has a tapered tip and a center hole 9a through which the electrode rod 11 is inserted. Further, the lens portion 9 is provided with gas blowing holes of 1° at locations close to the nozzle mounting portion 8.

The collet camp 13 includes a head 13a having an outer diameter that is approximately the same as the outer diameter of the seal 5, a threaded portion 13b that is screwed into the threaded portion 2b of the body body 2 from above, and a collet 1.
4, and the collet 14 includes a shaft hole 14a and a vertical groove 14b communicating with the shaft hole 14a. A cross groove 15 is cut on the upper surface of the head 13a of the collet cap 13.

A cooling water supply pipe 16 is fixed to the outer ring 3 of the main body 2, and one end of the cooling water supply pipe 16 passes through the outer ring 3 in a watertight manner from a direction perpendicular to its axis and communicates with the cooling water passage 4. A gas supply pipe 17 is arranged parallel to the water supply pipe 16. This gas supply pipe 17 has one end that penetrates the outer ring 3 and the main body 2 in a watertight manner, and extends through the shaft hole 2 of the main body 2.
It is connected to a.

The torch body 18 has a cylindrical shape and is fitted on the outside of the cooling water supply pipe 16 and the gas supply pipe 17. The tip of the torch body 18 is fixed to the outer peripheral surface of the outer ring 3 in a watertight manner, and a drain pipe 19 is attached to the rear end.

A sealing member 20 through which the cooling water supply pipe 16 and the gas supply pipe 17 penetrate in a watertight manner is fitted to the outer end of the torch body 18 in a watertight manner. The outer ring 3 has communication holes 3 so that the cooling water supplied from the cooling water supply pipe 16 to the cooling water passage 4 can flow into the torch body 18.
a is opened.

The welding torch l formed as described above is not provided with a separate drain pipe for discharging cooling water from the body body 2 as in the conventional case, and the torch body 18 is connected to the body body 2.
It also serves as a drain pipe for cooling water from the pipe. Therefore, the body main body 2. The length including the nozzle 12 and the electrode rod 11 can be set to a size that can be inserted into a pipe with a diameter of 25 to 30 mm.

In the above configuration, the body main body 2 of the welding torch 1
is inserted into the butt welding position in, for example, two small-diameter pipes P and P1 (see Fig. 4), cooling water is supplied from the cooling water supply pipe 16, and welding current is supplied to the electrode rod 11, and An inert gas is supplied from the gas supply pipe 17 and is ejected from the gas blowing hole 10 of the gas lens body 6 into the nozzle 12 to weld the abutting portions of the two pipes P and P1.

The cooling water supplied from the cooling water supply pipe 16 flows into the cooling water flow path 4 to cool the main body 2, and then flows into the torch body 18 from the communication hole 3a of the outer ring 3 to cool the torch body 18. It is cooled and then discharged from the drain pipe 19 to the outside. Since the entire torch body 18 is cooled by the cooling water in this way, the operator's hand that grips the torch body 18 during welding does not get hot, and the welding operation can be performed continuously for a long time.

When the tip of the electrode rod 11 is worn out due to welding of the small diameter pipes P and Pi, the collet camp 13 is loosened from the body 2, and the grip of the electrode rod 11 by the collet 14 is loosened. Next, gas lens body 6
The tip of the electrode rod 11 is positioned with respect to the tip of the lens portion 9, and the collet cap 13 is again tightened to the body 2, so that the collet 14 grips the electrode rod 11.

Once the positioning of the electrode rod 11 with respect to the gas lens body 6 is completed in this manner, welding can be performed again as described above.

FIG. 5 shows a second embodiment. In this figure, the welding torch IA differs from the welding torch 1 of the first embodiment in that a wire supply section 21 is formed on the lower surface of the torch body 18.

That is, the lower surface of the torch body 18 has a small hole 22a,
Front and rear brackets 22, 23 each having 23a
are fixed at predetermined intervals.

Then, the chip adapter 24 has its mounting portion 24a inserted into the small hole 22a of the front bracket 22. This tip adapter 24 has a threaded portion 2 in the shaft hole.
4b, and the length of the mounting portion 24a is approximately equal to the thickness of the bracket 22. The chip adapter 24 continues from the mounting part 24a, and the chip adapter 24 is connected to the mounting part 24a.
There is a flange 24C having a diameter larger than that of the flange 4a, and the rear part of the flange 24c is longer than the attachment part 24a.

The tip 25 is attached to the threaded portion 24 of the shaft hole of the tip adapter 24.
It has a cylindrical portion 25a that is screwed onto the cylindrical portion 25a, a flange portion 25b having a larger diameter than the cylindrical portion 25a, and a tip portion 25c tapered from the flange portion 25b. A shaft hole 25d is formed through which a welding wire W is inserted. The wire guide 26 is a rod of a predetermined length having a shaft hole 26a into which the wire W is inserted, and a tip adapter 2 is provided on the outer peripheral surface of the front end.
A threaded portion 26b that is screwed into the threaded portion 24b of No. 4 is provided.

When assembling the wire supply section 21, the mounting section 24a of the tip adapter 24 is inserted into the small hole 22a of the front bracket 22 from the rear bracket 23 side. Next, the cylindrical part 25a of the tip 25 is screwed into the threaded part 24b of the tip adapter 24, and the flange part 2 of the tip adapter 24 is attached.
4c and the flange 25b of the chip 25, the bracket 2
Tighten 2 from both sides. Thereby, the chip 25 is fixed to the bracket 22 via the chip adapter 24.

Next, insert the wire guide 26 into the small hole 23 of the rear bracket 23.
a, and after screwing the nut 27 into the threaded portion 26b at the tip thereof, the threaded portion 26b is screwed into the threaded portion 24b of the tip adapter 24.

Next, by tightening the nut 27 to the tip adapter 24, the wire guide 26 is attached to the tip adapter 24.
It is securely fixed against the

This welding torch IA is used when performing welding or overlay work.
A wire rod W (shown by a two-dot chain line in FIG. 6) is supplied to the wire rod guide 26 of the wire rod supply section 21 from a commercially available wire rod feeder (not shown). When this wire rod W is welded, etc., the tip thereof is connected to the wire guide 26. Chip adapter 24
The electrode rod 1 in the nozzle 12 protrudes from the tip 25 through the
It is always located at the bottom of 1.

This welding torch IA also includes two wire supply parts and has an inner diameter of 2.
The dimensions are such that it can be inserted into the pipe of 5 Seiho.

Above 1st. Torch of second embodiment 1. By lengthening the torch body 18 and connecting extension pipes (not shown) to the cooling water supply pipe 16 and gas supply pipe 17, IA can perform welding deep into small diameter pipes. .

As described in detail, in the torch of the first invention, the collet cap is screwed onto the body without its head protruding from the upper surface of the body, so the tip portion including the body can be narrowed. The collet can be sized so that it can be inserted into the bore pipe, and the collet is pressed against the gas lens body and can grip the electrode rod when screwed.
Even if the electrode rod becomes short due to wear, the amount of protrusion from the gas lens body can be adjusted to the most suitable length for welding, etc. Furthermore, the cooling water supply pipe for cooling the main body is also used as the torch body, so that the torch body is constantly cooled during welding work, etc., so that the worker's hands are not heated by the welding heat. can be prevented and work can be continued. Furthermore, since the torch of the second invention has a welding wire supply section, it is possible to perform not only welding of small diameter pipes but also overlaying and the like.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a welding torch of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of the main body of the welding torch of Fig. 1, Fig. 3 is a plan view of Fig. 2, and Fig. 4 1 is an assembled front view of FIG. 1, FIG. 5 is an exploded perspective view of the wire supply section attached to the torch body of the welding torch of the second embodiment, and FIG. 6 is an assembled welding torch of the second embodiment. It is a front view. FIG. 7 is an exploded perspective view of a conventional welding torch. 1.1 person...Welding torch 2...Body body 2a...Shaft hole 2b...Threaded part 2C...Groove 3...Outer ring 4
...Cooling water flow path 6...Gas lens body 10...Gas blowout hole 11...Electrode rod 12...
Nozzle 13... Collet cap 14...
Collet 16...Cooling water supply pipe 17...Gas supply pipe 18...Torch body 19...Drain pipe 21...Wire supply section 25...Chip P, Pi...Small diameter pipe W ...Wire rod disease Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A cylindrical body body with a cooling water flow path between the outer circumference and a threaded shaft hole, a threaded part on the upper outer surface into which the nozzle is screwed, and a threaded part below this threaded part. A cylindrical gas lens body with a bottom is provided with an appropriate number of gas blow-off holes and a hole through which an electrode rod is inserted in the lower end shaft center, and is coaxially attached to the lower part of the body body, and a threaded portion is attached to the body body. When the threaded part of the shaft hole is screwed airtightly from above, the lower collet engages with the inner surface of the lower part of the gas lens body to grip the electrode rod, and the collet cap penetrates the body body from the outside in a watertight manner. a cooling water supply pipe that communicates with the cooling water flow path of the main body; and an inert gas that is arranged in parallel with the cooling water supply pipe and that penetrates the body main body from the outside in a watertight manner and communicates into the gas lens body. a welding torch equipped with a supply pipe, the welding torch having a hole fitted on the outside of the inert gas supply pipe and the cooling water supply pipe, one end of which is fixed to the outer surface of the main body in a watertight manner, and a hole drilled in the outer surface of the body; For welding in a small-diameter pipe, the torch body is provided with a drain pipe attached to the torch body and communicates with the cooling water flow path through the collet cap, and the upper surface of the collet cap is made substantially the same as the upper surface of the body main body. torch. (2) A cylindrical body body with a cooling water flow path between the outer circumference and the threaded shaft hole, a threaded part on the upper outer surface into which the nozzle is screwed, and a threaded part below this threaded part. A cylindrical gas lens body with a bottom is provided with an appropriate number of gas blow-off holes and a hole through which an electrode rod is inserted in the lower end shaft center, and is coaxially attached to the lower part of the body body, and a threaded portion is attached to the body body. When the threaded part of the shaft hole is screwed airtightly from above, the lower collet engages with the inner surface of the lower part of the gas lens body to grip the electrode rod, and the collet cap penetrates the body body from the outside in a watertight manner. a cooling water supply pipe that communicates with the cooling water flow path of the main body; and an inert gas supply that is arranged in parallel with the cooling water supply pipe and that penetrates the body from the outside in a watertight manner and communicates into the gas lens body. In the welding torch equipped with a pipe, the welding torch is fitted on the outside of the inert gas supply pipe and the cooling water supply pipe, and one end is fixed to the outer surface of the body main body in a watertight manner, and a hole is formed in the outer surface. A torch body is provided with a drain pipe attached thereto and communicates with the cooling water flow path through the torch body, and a wire rod supply section is provided with a tip attached to the lower part of the torch body and supplies the wire rod to the lower part of the electrode rod. A torch for welding inside a small-diameter pipe, characterized in that the upper surface of the collet cap is substantially the same as the upper surface of the body main body.