JP2911271B2 - TIG welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torch for TIG welding such as a pencil type used in a welding operation.

[0002]

2. Description of the Related Art An example of a conventional pencil-type TIG welding torch will be described with reference to FIG. In FIG. 5, reference numeral 1 denotes a torch main body, which includes a substantially cylindrical metal member 2 and a substantially cylindrical insulating member 3 formed of an insulating material and surrounding the metal member 2. An electrode 4 is inserted into the torch main body 1, and the electrode 4 is fixed and held by a collet 5 provided at the tip of the torch main body 1. The collet 5 is held in contact with the collet body 6, and a gas through hole 10 is formed at the tip of the collet body 6. Reference numeral 7 denotes a nozzle for supplying a shield gas to the welded portion, 8 denotes a shield gas passage hole formed in the metal member 2, 9 denotes an orifice provided at the tip end of the metal member 2, and the orifice 9 is a collet 5 Of the base side of FIG.
As shown in (a) and (b), a plurality of cutouts 11 are formed to connect the central portion and the outer peripheral portion of the orifice 9.

The path of the shield gas from the torch body 1 to the nozzle 7 is as follows. First, after passing through the shield gas passage hole 8 inside the metal member 2, it passes through the notch 11 of the orifice 9 between the outer surface at the base side of the collet 5 and the inner surface at the tip of the metal member 2. Next, the gas passes between the inner surface of the collet body 6 and the outer surface of the collet 5, and is supplied into the nozzle 7 through a gas through hole 10 provided on the tip side of the collet body 6.

[0004]

However, the pencil type TIG welding torch having the above-mentioned conventional structure has the following problems.

The orifice 9 provided on the tip side of the torch main body 1 is press-fitted and fixed in the hole on the tip side of the metal member 2. There is a problem that the orifice 9 falls off from the tip of the torch main body 1.

As one method for improving the gas shielding property of the welded portion, the number of the notches 11 in the orifice 9 and the number of the gas holes 10 in the collet body 6 may be increased.
When increasing the number of the notches 11 of the orifice 9, the outer and inner surfaces of the orifice 9 are processed by a lathe, whereas the notches 11 are processed by a milling machine.
Processing becomes complicated and processing cost increases. Further, the orifice 9 itself has a complicated shape, so that the manufacturing cost is increased, and there is a problem that an assembling operation of press-fitting the orifice 9 into the torch main body 1 is required.

Further, since the base side of the collet 5 is held only by the end face of the orifice 9 at the tip end, when the collet 5 and the electrode 4 are mounted eccentrically at the tip of the orifice 9, the gas from the orifice 9 is removed. There is also a problem that the flow of the shielding gas up to the through hole 10 is disturbed, and the gas shielding property of the welded portion is deteriorated.

The present invention solves the above-mentioned conventional problems. The gas shielding property can be easily improved, and by eliminating the orifice, the cost can be reduced and the assembly workability can be improved. It is an object of the present invention to provide an excellent TIG welding torch capable of improving quality by preventing the occurrence of gas and improving the gas shielding property of a welded portion by making the flow of shielding gas uniform.

[0009]

In order to solve the above-mentioned problems, a torch for TIG welding according to the present invention is provided with a first concave portion for receiving a base of the collet in a fitted state at a tip of a metal member of a torch body. Is formed at a part of the outer periphery of the first recess so as to be deeper than the bottom surface of the first recess and partially larger than the outer diameter of the first recess. This is provided with a second concave portion communicating with the second concave portion.

[0010]

According to the torch for TIG welding of the present invention, the orifice can be removed from the torch main body, so that the cost of parts can be reduced, the workability of assembling can be improved by eliminating the work of assembling the orifice, and the orifice can be prevented from falling off. Quality can be improved. Further, since the number of the second concave portions, which are the gas through holes around the collet base side receiving portion at the tip of the torch main body, can be increased at a low cost, the gas shielding property can be easily improved. Further, since the collet is fixed in the radial direction at the first concave portion at the tip of the torch main body, the flow of the shielding gas from the torch main body to the gas through hole of the collet body can be made uniform, so that the gas shielding property of the welded portion can be further improved. .

[0011]

An embodiment of the present invention will be described below with reference to the drawings. The conventional TIG shown in FIG.
The only difference from the welding torch is the tip of the torch main body. Therefore, the other parts are denoted by the same reference numerals and their description is omitted.

The torch body 12 includes a substantially cylindrical metal member 13.
And a substantially cylindrical insulating member 3 surrounding the metal member 13. Copper or copper alloy material is used for the metal member 13 in consideration of electric conductivity and heat conductivity. In consideration of insulation, moldability and heat resistance,
For example, a plastic material such as phenol resin or a heat-resistant rubber material such as silicon rubber is used. Metal parts
A cylindrical hole for receiving the base side of the collet 5 in a fitted state and a collet receiving concave portion (first concave portion) 14 are formed at the tip end of the collet 5, and the collet 5 is fixed in the radial direction by the collet receiving concave portion 14.

As shown in FIG. 2, a part of the outer periphery of the collet receiving recess 14 extends in a direction parallel to the axis of the collet receiving recess 14 and is deeper than the bottom surface of the collet receiving recess 14 and is provided with the collet receiving recess 14. A gas passage recess 15 is formed as a second recess which is formed into a cylindrical shape so as to be partially larger than the outer diameter of 14.
The inside of the shield gas passage hole 8 in the inside and the outer peripheral space 5a on the base side of the collet 5 communicate with each other. Gas hole recess 15
Is equivalent to a notch 11 provided in the orifice 9 of the conventional pencil-type TIG welding torch. The shield gas passes through the shield gas passage hole 8 and then the gas through hole recess 15.
Through the collet body 6.

Conventionally, the number of the notches 11 may be increased as one of the methods for improving the gas shielding property of the welded portion. However, in order to increase the number of the notches 11, the outer or inner surface of the orifice 9 or the like is required. In contrast to machining with a lathe, the notch 11 is machined with a milling machine or the like, which complicates machining and increases machining costs. However, in this embodiment, the processing method of the gas through-hole recess 15 is based on the shield gas passage hole 8.
And the same processing method as the collet receiving recess 14,
The number of the gas passage recesses 15 can be easily increased, and the gas shielding property can be easily improved.

FIG. 2 is a sectional view taken along the line AA of the metal member 13 of this embodiment. Although the number of the gas passage recesses 15 is two, the number may be increased in order to improve the gas shielding property.
According to the above configuration, since the orifice 9 can be omitted from the torch main body 1, the cost of parts can be reduced and the orifice 9
Since the assembling work is not required, the assembling work can be improved, and the orifice 9 can be prevented from falling off, so that the quality can be improved. Further, since the number of gas through-hole recesses 15 which are gas through holes at the tip of the torch main body 1 can be increased at low cost, the gas shielding property can be easily improved.
Furthermore, since the collet 5 is fixed in the radial direction by the collet receiving recess 14 at the tip of the torch main body 1, the flow of the shielding gas from the torch main body 1 to the gas through hole 10 of the collet body 6 can be made uniform, and the gas shield at the welded portion can be made. The performance is further improved.

Next, a second embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 3, only the torch main body 16 is different from the structure shown in FIG. 1, and is otherwise the same as FIG.

This embodiment is a flexible type TIG torch. A gas pipe, a water supply pipe, and a drain pipe made of a metal pipe are provided at the center of the metal member 17, around which a flexible, insulating, In consideration of heat resistance, the insulating member 3 made of heat-resistant rubber such as silicon rubber is formed. Also in this embodiment, at the tip of the metal member 17,
A collet receiving recess 18 for receiving the base side of the collet 5 in the fitted state is formed, and a part of the outer periphery of the collet receiving recess 18 is parallel to the axis of the collet receiving recess 18 as shown in FIG. A gas passage hole recess 15 is formed as a second recess which extends in the second direction and is formed into a cylindrical shape so as to be deeper than the bottom surface of the collet receiving recess 18 and partially larger than the outer diameter of the collet receiving recess 18. The recess 15 communicates the shield gas passage hole 8 inside the metal member 17 with the outer peripheral space 5 a on the base side of the collet 5. The torch main body 16 differs from the above embodiment in that the shield gas passage hole 8 does not communicate with the collet receiving recess 18 coaxially, so that the electrode 4 can be inserted only up to the bottom of the collet receiving recess 18.

FIG. 4 is a sectional view taken along line BB of the metal member 17 of this embodiment, and the number of the gas through-hole recesses 15 is four. According to this embodiment, the same operation and effect as those of the above embodiment can be obtained.

[0019]

As is apparent from the above description, according to the torch for TIG welding of the present invention, the first side which receives the base side of the collet in the state of being fitted to the tip of the metal member of the torch body.
And the second recess which is a gas passage around the first recess, the orifice can be eliminated from the torch main body, thereby reducing the cost of parts and improving the assembling workability by eliminating the work of assembling the orifice. Quality can be improved because the orifice can be prevented from falling off. Further, the number of the second concave portions, which are the gas through holes around the collet base side receiving portion at the tip of the torch main body, can be increased at low cost, so that the gas shielding property can be easily improved. Furthermore, since the collet is fixed in the radial direction at the first concave portion at the tip of the torch main body, the flow of the shielding gas from the torch main body to the gas through hole of the collet body can be made uniform, thereby improving the excellent gas shielding property of the welded portion. Can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a torch for TIG welding according to a first embodiment of the present invention.

FIG. 2 is an AA cross-sectional view of the metal member in FIG.

FIG. 3 is a sectional view of a torch for TIG welding according to a second embodiment of the present invention.

FIG. 4 is a sectional view of the metal member taken along line BB in FIG. 3;

FIG. 5 is a cross-sectional view of a conventional TIG welding torch.

FIG. 6 is a partially cutaway side view and front view of a conventional orifice for TIG welding.

[Explanation of symbols]

 Reference Signs List 3 Insulating member 4 Electrode 5 Collet 12, 16 Torch body 13, 17 Metal member 14, 18 Collet receiving concave portion (first concave portion) 15 Gas through-hole concave portion (second concave portion)

Claims (1)

(57) [Claims] 1. A torch main body having a substantially cylindrical metal member provided with a shield gas passage hole therein and a substantially cylindrical insulating member surrounding the metal member, and an electrode located at the center of the torch main body. A collet for holding the collet at the tip of the metal member of the torch main body in a state in which the base side of the collet is fitted. The first concave portion is provided on a part of the outer periphery of the first concave portion. Deeper than the bottom of the recess and the first
A TIG welding torch provided with a second concave portion formed to be partially larger than the outer diameter of the concave portion and communicating with the shield gas passage hole.