JPH0323076A - Tig welding torch - Google Patents

Abstract

PURPOSE:To easily change an electrode by providing an electrode holder and a box body to hold each of a nozzle and a torch main body freely attachably and detachably at the specified position. CONSTITUTION:Welding conditions are changed during welding work and a tungsten electrode 150 is changed for a tungsten electrode 150 with the different diameter. In this case, the nozzle 130 is twisted and separated from the torch main body 120 and an union joint 181 is then separated from a gas pipe and then, the torch main body is twisted and separated from the box body 110. After this, the torch main body 120 fitted with the tungsten electrode 150 prepared separately is screwed in the box body 110 and further, the nozzle 130 is fitted to the torch main body 120. Further, the union joint 181 is connected to the gas pipe. By this method, the tungsten electrode 150 can be easily changed for the tungsten electrode 150 with the different diameter in a short time by simple operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a welding process using TIG welding (TUN) in which electrodes can be easily replaced.
gsten InertGas Arc Weldin
g) Relates to torches.

(Prior Art) FIG. 2 is a schematic diagram of a conventional TIG welding machine according to the present invention.

In the figure, 1 is a TIG Arc IL1 control device, 2 is a gas cylinder storing shielding gas made of argon gas, 3 is a TIG welding torch, 4 is a base material to be welded, 5
is the melting salary.

The TIG arc control device 1 includes a welding power source (not shown) having a drooping current-voltage characteristic, and a high-frequency power source necessary for generating an arc between the TIG welding torch 3 and the base metal 4 at the start of welding. A high frequency generator that generates high voltage (
(not shown), the ground side of the welding power source is connected to the base metal 4 via the base metal connection cable 6, and the non-ground side of the welding power source and the output end of the high frequency generator are connected to the welding cable 7. It is connected to the TIG welding torch 3 via.

The pressure of the shielding gas is adjusted by a gas regulator 8 attached to the gas cylinder 2, and the shielding gas is supplied to the TIG welding torch 3 via a gas vibrator 9.

The TIG welding torch 3 is provided with a torch switch 10, and the switch 10 is connected to the TIG arc control device 1 via a switch cable 11.

The TIG arc control device 1 supplies shielding gas to the TIG welding torch 3 according to the operation of the torch switch 10, applies a high frequency voltage to generate an arc, and supplies welding current.

FIG. 3 is an exploded sectional view showing the structure of a conventional TIG welding torch 3. In the figure, reference numeral 12 denotes a torch body made of a conductive material, which forms a collet body 13 and also forms a gas passage indicated by an arrow branching from the side of the collet body 13.

] 4 is a frame made of electrically insulating material, and the torch body 1
It covers the outer periphery of 2 and is insulated from the outside. Reference numeral 15 denotes a torch cap made of an electrically insulating material, which has a threaded portion 16 made of a conductive material inserted into one longitudinal end thereof, and a collet 17 serving as an electrode holder is press-connected to the tip of the threaded portion 16.

The collet 17 has a tungsten electrode 18 that can be attached and detached, and when the torch cap 15 is screwed in, the threaded part 16 of the torch cap 15 is screwed into the threaded part 19 formed in the collet body 13, and one end of the collet 17 is pressed, and the other end is pressed. By pressing the tapered portion 20 at the end against the tapered surface 21 of the collet body 13, the tungsten electrode 18
Tighten and secure.

22 is a nozzle that directs the shielding gas to the tungsten electrode 18.
Squirt toward the tip of the. The tungsten electrode 18 protrudes from the tip of the nozzle 22, and since its protrusion dimension is a factor in determining the arc length, the tungsten electrode 18 is always controlled within a predetermined size range to cope with wear and the like.

A flare nut 2 is attached to the end of the branched portion of the torch body 12.
3 is formed. Reference numeral 24 denotes a conductor vibrator made of a conductive material, and has a flare pipe joint 25 formed at one end thereof, and the flare pipe joint 25 is screwed into the flare nut 23 and connected thereto. A flexible welding cable 7 and a gas vibrator 9 are connected to the other end (not shown) of the conductor pipe 24, and supply welding current and shielding gas to the torch body 12. A rubber holder 26 with a non-slip handle is attached to a portion of the outer periphery of the conductive pipe 24.

(Problem to be Solved by the Invention) When performing welding work using the conventional TIG welding torch having the above-described structure, welding conditions such as the material of the welding base material 4 and the dimensions of the welding location may change. be. In this case, in order to perform efficient and clean welding, it is necessary to replace the electrode with a tungsten electrode having a diameter suitable for the welding conditions.

To do this, first pinch the torch cap 15, and then
6 to remove the tungsten electrode 18, and insert a tungsten electrode suitable for the welding conditions into the collet 17.

After this, the tungsten electrode 18 from the tip of the nozzle 22
The protrusion dimension must be adjusted to the specified dimension using a jig or the like. For this reason, it was very time-consuming and inefficient.

Particularly when welding work is automated, there is a problem in that if the welding work is interrupted for a long time due to replacement or adjustment of the tungsten electrode 18, the automatic work process will be hindered.

In view of the above-mentioned problems, an object of the present invention is to provide a TIG welding torch in which a tungsten electrode of a diameter suitable for welding conditions can be easily attached and detached, and the protrusion dimension of the tungsten electrode can be adjusted in a process separate from the welding operation. It is about providing.

(Means for Solving the Problems) In order to achieve the above objects, the present invention includes: an electrode holder made of a conductive material and capable of detachably holding a tungsten electrode; a nozzle for ejecting shielding gas for welding; a torch body made of a conductive material, having a gas passage, detachably holding the electrode holder in a predetermined position, applying a welding current to the tungsten electrode of the electrode holder, and guiding shielding gas to the nozzle; A TIG welding torch is proposed that includes a holder and a housing that removably holds the nozzle and the torch body in predetermined positions.

(Function) According to the present invention, the tungsten electrode is detachably held by the electrode holder. Further, the electrode holder is detachably held at a predetermined position on the torch body, and a welding current is applied to the tungsten electrode from the torch body. Further, shielding gas for welding is guided to a nozzle by the torch body and is ejected from the nozzle.

The electrode holder, the nozzle, and the torch body are each held at a predetermined position in the housing and integrated. At this time, since the torch body is detachably held in the housing, by removing the torch body from the housing, the tungsten electrode is also removed together with the torch body.

Therefore, by separately preparing a torch body to which tungsten electrodes of different diameters are attached, the tungsten electrodes can be easily replaced. At this time, the dimensions of the tungsten electrode protruding from the tip of the nozzle are set to predetermined dimensions by setting the dimensions of the tungsten electrode protruding from the torch body to predetermined dimensions using a jig or the like in advance.

(Embodiment) FIG. 1 is an exploded perspective view showing essential parts of an embodiment of the present invention, and FIG. 4 is a sectional view of the embodiment. These Figures 1 and 4
The TIG welding torch shown in the figure is used in place of the TIG welding torch 3 in the configuration shown in FIG.

This embodiment will be explained below based on FIGS. 1 and 4. In the figure, HO is a casing, which has a cylindrical shape and is composed of an outer wall 111 made of an electrically insulating material and an inner wall 112 made of a conductive material that is in close contact with the inner surface of this outer wall.

Further, a threaded portion 113 is provided on the inner circumferential surface of the housing 110 at one end in the longitudinal direction. Further, an opening 114 is provided on the side surface of the housing 110 near the threaded portion 113, and the opening 114 on the threaded portion 113 side. There is a recess {15} on one side of 4,
A groove H6 of a predetermined length is provided at the center of one side of the opening 114 facing the recess 115.

Reference numeral 120 denotes a torch body made of a conductive material, which includes a cylindrical first guide part 121 having a threaded part L21a screwed into the threaded part 113 on the outer peripheral wall, and an outer diameter smaller than this first guide part 12r. a second guide part 122 adjacent to the first guide part 121 with its axis aligned with the second guide part 1;
A cylindrical electrode guide part 1 adjacent to 22 with its axis aligned with
It consists of 23.

A predetermined threaded portion 122a is provided on the outer peripheral wall of the second guide portion 122.
is provided. In addition, the first and second guide portions 121
, 122 and the electrode guide part 123 are provided with an electrode setting hole 124 of a predetermined diameter.
The diameter of 4 gradually narrows, and an electrode guide hole 125 is formed having a diameter corresponding to the outer diameter of the tungsten electrode used. Further, a plurality of gas flow ports 12B are provided on the side wall of the tip end of the electrode guide section 123. Further, the torch body 120 is provided with a gas passage 127, one end of the gas passage 127 is formed near the electrode setting hole 124 of the first guide part 121, and the other end is formed in the longitudinal direction of the electrode setting hole 124. Connecting to the central part of the direction. Further, a sealing O-ring 128 having a circular cross section is provided near the entrance of the electrode set hole 124 of the first guide portion 121.

Reference numeral 130 denotes a nozzle made of cylindrical porcelain and tapered at one end. The inner diameter of this nozzle 130 is formed so that the torch body 120 can be inserted from the other end side having a large outer diameter, and is provided with a threaded portion 131 that screws into the threaded portion 122a of the second guide portion 122 of the torch body 120. It is being Further, the inner wall at one end side (tip part) of the nozzle 130 is formed so that the shielding gas flowing out from the gas flow port 12B of the electrode guide part 123 of the torch body 120 can be ejected to the outside.

Reference numeral 140 denotes an electrode holder made of a conductive material, which includes a cylindrical first,
It consists of second guide parts 141, 142 and a boss part 143, with the second guide part 142 placed in the center and the respective axes aligned and closely attached.

The outer diameter of the second guide part 142 is larger than the outer diameter of the first guide part 141, and the outer diameter of the boss part 143 is larger than the outer diameter of the second guide part 142. Second
The guide part 142 is connected to the electrode setting hole 12 of the torch body 120.
It is now possible to inhabit 4.

Further, the inner diameter of the electrode holder 140 is slightly larger than the outer diameter of the cylindrical tungsten electrode 150, and the tungsten electrode 150 is fixed with a screw 144 screwed into the boss portion 143. It has become.

A cover 160 is shaped to fit into the opening 114 of the housing 110, and is composed of an outer wall 161 made of an electrically insulating material and an inner wall 1B2 made of a conductive material closely attached to this outer wall. Furthermore, a protrusion 1133 made of a conductive material is provided on one end in the longitudinal direction of the inner surface of the inner wall 1B2. moreover,
A horizontal piece 171 of a presser spring 170 made of an L-shaped member is fixed to a predetermined position on the inner surface of the inner wall 182. The presser spring 170 is made of an elastic conductive material, and its vertical piece 17
2 has a groove 172b of a predetermined length formed in its tip 172a, and the tip 172a of the vertical piece 172 is slightly bent toward the horizontal piece 171.

180 is a gas pipe having a predetermined diameter, one end of which is connected to the gas passage 127 of the torch body 120, and a union joint 181 is provided at the other end.

According to this embodiment having the above-described configuration, the threaded portion 113 of the casing 110 is connected to the threaded portion of the torch body {20! 21a is screwed together, and the nozzle 13 is attached to the threaded portion 122a of the torch body 120.
The threaded portion i31 of No. 0 is screwed together, and the housing 110, the torch main body 120, and the nozzle 130 are integrated. At this time, the inner wall 112 of the housing 110 and the torch main body 120 are electrically connected. Further, the gas pipe 180 is located on the opposite side from the opening 114.

The operator attaches the electrode holder 140 to a predetermined position of the tungsten electrode 150 in advance. This tungsten electrode 150 is inserted into the electrode set hole 124 of the torch body 120 through the opening 114 of the housing 110.

At this time, since the outer diameter of the first guide part 141 of the electrode holder 140 is smaller than the inner diameter of the electrode setting hole 124, the second
The guide portion 142 can be easily fitted into the electrode setting hole 124. Furthermore, a groove 116 is provided through which the tungsten electrode 150 can pass, so that the tungsten electrode {50 can be easily inserted into the housing 110 through the opening 114.

With the second guide part 142 of the electrode holder 140 fitted into the electrode set hole 124, insert the tungsten electrode 150.
The tip of the nozzle 130 is supported by the electrode guide hole 125 and protrudes from the tip of the nozzle 130 by a predetermined distance. This protrusion dimension is determined by the following:
It is determined by the mounting position of 40.

Further, in this state, the cover 160 is fitted to the housing 110 so that the protrusion 163 of the cover 160 comes into contact with the inner surface of the housing 110 having the groove 116. At this time, the tungsten electrode 150 is inserted into the groove 172b of the presser spring 170, and the boss portion 143 of the electrode holder 140 is pressed against the torch body 120 by the vertical piece 172 of the presser spring 170 and fixed. cover 160 and housing 110
Since the tip of the vertical piece 172 of the presser spring 170 is slightly bent, the tip of the vertical piece 172 will not get caught on the boss portion 143. In this way, the tungsten electrode 150 can be easily attached.

Furthermore, when using the TIG welding torch described above, a cable (not shown) is connected to the inner wall 112 of the housing 110 to supply welding current. Furthermore, this current is supplied to the tungsten electrode 150 via the torch body 120, the m-pole holder 140, the inner wall {82 of the cover 160, and the presser spring 170. Further, a gas vibrator (not shown) is connected to the union joint 181 to supply shielding gas. This shielding gas is supplied to the gas pipe l80 and the gas passage 127.
The gas is ejected from the tip of the nozzle 130 through the electrode set hole 124 and the gas flow port 12B so as to surround the tungsten electrode 150.

At this time, the O-ring 128 prevents gas leakage from the gap between the second guide part 142 of the electrode holder 140 and the first guide part 12k of the torch body 120.

Further, a tungsten electrode 150, an electrode holder 140, and a torch main body 120 are prepared in accordance with welding conditions such as the material of the welding base material and the dimensions of the welding location.

That is, the tungsten electrode 150 corresponds to the welding conditions.
The diameters are 0.5, 1.0, 1. B, 2
．． 4. 3.2, 4.0, 4.8, 8.4
(mm) class 81 is prepared. Furthermore, a torch body 120 having an electrode guide hole 125 with a diameter corresponding to the diameter of the tungsten electrode 150 and an electrode holder 140 with an inner diameter corresponding to the diameter of the tungsten electrode 150 are prepared. Further, the protrusion size of the tungsten electrode 150 from the tip of the nozzle 130 is determined by the attachment position of the electrode holder 140 to the tungsten electrode 150, as described above, so it can be adjusted in a process separate from the welding work. can. Therefore, when the welding conditions change during the welding operation and the tungsten electrode {50 is replaced with a tungsten electrode {50 of a different diameter, the nozzle 130 is first twisted to separate it from the torch body 120. Next, after separating the union joint 181 from the gas vibrator (not shown), the torch body is twisted to separate it from the housing 11O. Thereafter, the torch body 120, to which a separately prepared tungsten electrode 150 is attached, is screwed into the housing 110, and the nozzle 130 is further attached to the torch body 12. Furthermore, a union joint 181 is connected to the gas pipe. With such simple operations, the tungsten electrode 150 can be easily replaced with a different diameter tungsten electrode 150 in a short time.

In addition, since the tip of the tungsten electrode 150 was worn out,
When replacing the tungsten electrode 150 with the same diameter,
Hook a nail or the like into the recess 115 of the casing 110 and remove the cover 180.
If you remove the tungsten electrode 1 along with the electrode holder,
50 can be easily removed. Thereafter, by attaching the tungsten electrode 150 mounted on the electrode holder 140 prepared in advance to the torch body 120 in the above-described procedure, the tungsten electrode 150 can be replaced in an extremely short time. This eliminates the problem of welding work.

(Effects of the Invention) As described above, according to the present invention, the electrode holder holding the tungsten electrode is detachably held in the torch body. Furthermore, since the electrode holder, nozzle, and torch body are each detachably held at predetermined positions in the housing, the torch body with the tungsten electrode attached thereto can be easily removed from the housing. Therefore, by separately preparing a torch body in which tungsten electrodes of a plurality of different diameters are attached, it is possible to easily and quickly replace the torch body with a tungsten electrode having a diameter suitable for the welding conditions. Further, by setting the dimensions of the tungsten electrode protruding from the torch body to a predetermined size using a jig or the like in advance, the dimensions of the tungsten electrode protruding from the tip of the nozzle can be set to a predetermined size. This provides an excellent effect in that the replacement of the tungsten electrode does not interfere with the welding operation. Furthermore, the protrusion dimension of the tungsten electrode has the advantage that it can be done in a process separate from the welding operation.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing essential parts of an embodiment of the present invention, Fig. 2 is a schematic configuration diagram of a conventional TIG welding machine, Fig. 3 is an exploded sectional view of a conventional TIG welding torch, and Fig. 4 is a sectional view of one embodiment. 110... Housing, 111... Outer wall, 112... Inner wall, 113... Threaded portion, 114... Opening, 120
...Torch body, 121...First guide part, 121
a...Threaded part, 122...Second guide part,! 22a
...Threaded part, 123... Electrode guide part, 124...
・Electrode set hole, 125... Electrode guide hole, 130・
... Nozzle, 13l... Threaded part, [40... Electrode holder, 150... Tungsten electrode, l60... Cover, 180... Gas pipe, 181... Union joint.

Claims (1)

[Scope of Claims] An electrode holder made of a conductive material and detachably holding a tungsten electrode; a nozzle for spouting a shielding gas for welding; and a nozzle made of a conductive material and having a gas passage, the electrode holder being held at a predetermined position. a torch body that removably holds the tungsten electrode of the electrode holder, conducts welding current to the tungsten electrode of the electrode holder, and guides shielding gas to the nozzle, and attaches and detaches each of the electrode holder, the nozzle, and the torch body to predetermined positions. A TIG welding torch characterized by comprising a casing for freely holding the torch.