JPH10263824A - Electrode installing structure in tig welding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly exchange a tungsten electrode in correspondence to such a situation as necessitating to exchange or regulate the electrode during working because of receiving oxidation and damage to the electrode by using in a TIG welding machine using non-consumable tungsten electrodes. SOLUTION: The electrode cartridge 1 provided with a cylindrical cartridge main body 3 is installed to a torch main body 2 so as to be freely attachable and detachable. The torch main body 2 is connected to a welding power source and an inert gas feeding passage is formed. The fixing means freely attaching and detaching the tungsten electrode 4 making the projecting dimension from the tip end a constant is provided in the electrode cartridge 1, the tungsten electrode is connected to the welding power source by installing to the torch main body 2, moreover the inert gas feeding passage of the torch main body 2 is communicated into the cylindrical cartridge main body 3, and the inert gas is made to jet toward the tip end part of the tungsten electrode 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to one type of inert gas arc welding and relates to a TIG welding machine using a non-consumable tungsten electrode, and particularly to a TIG welding machine which can be quickly replaced in response to wear of the electrode. The present invention relates to an electrode mounting structure.

[0002]

2. Description of the Related Art Tungsten electrodes in a TIG welding machine are fixed in a welding torch so that the tip protrudes by a certain size.
An arc is generated between the base material and the base material under a state of a gas shield for injecting an inert gas, and the base material or the base material and the filler material are melted and welded. However, as the tungsten electrode is used, the tungsten electrode is oxidized, short-circuited with the base material, or damaged by a filler material attached. For this reason, in the past, for example, the work was sometimes interrupted during automatic welding, the electrode was removed and polished, or replaced with a new electrode, and the mounting state, especially the gap between the workpiece and the electrode, was adjusted and used one by one. .

In order to cope with oxidation and damage of these electrodes, a method of stably generating an arc by polishing the tip during standby of a welding torch or the like (Utility Model Registration No. 250639) or The idea that the electrodes are sandwiched by a collet chuck type clamp so that the electrodes can be quickly replaced (Japanese Patent Application Laid-Open No. 7-290248).
No.) has been proposed.

[0004]

In the conventional method of removing and re-attaching the tungsten electrode, the work has to be interrupted for a long time, and the electrode can be clamped and fastened by a clamp, for example. Even so,
It is necessary to accurately adjust the protruding dimension of the electrode, that is, the gap between the electrode and the work, and the replacement is troublesome. In addition, in the method of frequently polishing the electrode, a delicate gap between the electrode and the base material is deviated.

In view of the above-mentioned disadvantages of the prior art, the present invention can replace a tungsten electrode more quickly and, when applied to a torch of an automatic welding machine, adjusts the protrusion size of the electrode one by one for each replacement. No need,
An object of the present invention is to provide an electrode mounting structure capable of performing an efficient welding operation with a short interruption time of the operation.

[0006]

The tungsten electrode according to the present invention is detachable from the torch body 1 as a cartridge type. The torch main body 1 is formed at least in part with a good electrical conductor, is connected to a welding power source, and forms an inert gas supply passage 10. The electrode cartridge 1 which is detachable from the torch body 2 is a cylindrical cartridge body 3.
The cartridge main body 3 is provided with fixing means for making the protrusion size from the tip constant and making the tungsten electrode 4 detachable. On the other hand, the inert gas supplied to the inert gas supply passage of the torch main body 2 is guided into the cartridge main body 3 at the mounting position, and ejects the inert gas toward the tip of the tungsten electrode 4.

Specifically, both the torch main body 2 and the electrode cartridge 1 are made of an electrically good conductor, that is, made of metal.
It is preferable that the tungsten electrode 4 be connected to the welding power source and electrically connected only by being mounted. The electrode cartridge 1 has the tungsten electrode 4 loosely penetrated on the center line of the cylindrical cartridge body 3 having the diaphragm wall 5 formed therein, and communicates the space on the base end side of the diaphragm wall 5 with the inert gas supply passage of the torch body 2. Then, inert gas is ejected from the gas passage 6 formed in the throttle wall 5 toward the tip of the tungsten electrode 4. The means for fixing the tungsten electrode 4 is arbitrary. For example, a collet cylinder 7 having a tapered base end wall surface of the throttle wall 5 and a plurality of cuts 8 provided from the tip end.
Is mounted on the tungsten electrode 4, and the base end of the collet cylinder 7 is pressed forward by a pressing screw 9 provided at the base end of the cartridge body 3, so that the tapered stop wall 5 has a tapered base wall 5. Collet cylinder 7 guided and bent inward
To fix the tungsten electrode 4.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an electrode mounting structure in a TIG welding machine according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 of the accompanying drawings is an exploded perspective view of a cartridge type tungsten electrode mounting portion, FIG. 2 is a longitudinal sectional view of only the electrode cartridge 1, and FIG. 3 is a longitudinal sectional view of a state where the electrode cartridge 1 is mounted on the torch main body 2. It is.

The torch may be hand-held, but FIG. 3 shows a torch for an automatic welding machine mounted on a welding head 11 which is controlled to move along the shape of the welded part of the workpiece. Is shown. The torch main body 2 is made of a good electrical conductor, that is, made of metal. The welding current cable 12 is connected to the base end of the torch main body 2, and a circular mounting hole is formed from the distal end side.
The electrode cartridge 1 of a tungsten electrode is mounted in the mounting hole 13. Also, in the torch body 2,
An inert gas supply passage 10 is formed from above toward the mounting hole 13 so that an inert gas such as argon is supplied.

As shown in FIGS. 1 and 2, the electrode cartridge 1 is provided with a tungsten electrode 4 which can move freely along the center line at the center of a substantially cylindrical cartridge body 3 made of metal. The tungsten electrode 4 can be fixed at an arbitrary floating position. A diaphragm wall 5 is provided inside the cylindrical cartridge body 3, a through hole 14 is provided at the center of the diaphragm wall 5 so that the tungsten electrode 4 is loosely fitted, and the base side wall surface of the diaphragm wall 5 is tapered. Hole 14
Then, a cylindrical tungsten electrode having a sharpened tip is made to pass through.

A cylindrical collet tube 7 provided with a plurality of cuts 8 in the axial direction from the distal end toward the proximal end is attached to the tungsten electrode 4. The proximal end of the collet tube 7 is Is pushed forward by a pressing screw 9 screwed to the base end of the. When the collet cylinder 7 is mounted on the tungsten electrode 4 and the pressing screw 9 is tightened in a state where the tip of the tungsten electrode 4 protrudes from the tip of the cartridge body by a predetermined dimension, the tip of the collet cylinder 7 is tapered on the diaphragm wall 5. To bend inward, and the tungsten electrode 4 is firmly fixed at that position. However, the fixing means of the tungsten electrode 4 is not limited to the above method. For example, another chucking mechanism may be provided at the base end of the cartridge body, or the base end of the tungsten electrode 4 may be set as a male screw, and the pressing screw 9 may be used. Screw it into the center or the base end wall of the cartridge body that has been made into a blind cylinder,
It is also possible to adjust the protrusion dimension of the tip by the screwing depth.

On the outer peripheral surface of the cartridge body 3, a concave circumferential groove 15 having a constant width is provided at a position facing the inert gas supply passage 10 provided in the torch body when the cartridge body 3 is mounted on the torch body 2. The gas passage 16 is formed as one or a plurality of through holes formed in the peripheral wall surface in the concave peripheral groove 15 portion. Further, a plurality of gas passages 6, 6 penetrating from the base end side to the front side are provided at equal intervals in the throttle wall 5 in the cartridge body 3. As a result, the inert gas supplied to the inert gas passage 10 provided in the torch body 2
The inert gas introduced from 16 into the cartridge body 3 and introduced into the cartridge body 3 is ejected from the gas passages 6, 6 toward the tip of the tungsten electrode 4.

In the illustrated example, a wire mesh 17 is attached to the front end of the cartridge body 3 and fixed with a retaining ring 18 such as a snap ring. This wire mesh 17 is shown in FIG.
Are described as a single sheet, but in FIG. 2, they are described as a double sheet. The wire mesh 17 avoids bias and turbulence of the flow of the inert gas ejected from the gas passage 6, and completely inactivates the atmosphere at the tip of the tungsten electrode 4, that is, at the molten portion of the work or the filler material. It is effective in making gas.

In order to mount the above-described electrode cartridge 1 on the torch main body 2, the electrode cartridge 1 is inserted into the mounting hole 13 of the torch main body 2, and a cap 19 is screwed onto an opening end of the mounting hole 13. The tip of the electrode cartridge 1 is pressed and fixed. A cap 19 for pressing and fixing the electrode cartridge 1 to the opening end of the mounting hole 13 by screwing or other fixing means is formed of a heat-resistant insulator such as ceramic so that the electrode cartridge 1 and the torch main body 2 come close to or come into contact with the work. It also functions as a guard to prevent the situation.

The cap 19 in the illustrated example has a short cylindrical portion 19a having a slightly smaller diameter at the tip end, and a wire mesh 20 different from the wire mesh 17 is mounted between the cap 19 and the electrode cartridge 1. I have. By wire mesh 20,
The function of the wire mesh 17 is promoted, the flow of the inert gas is made smoother, and the molten portion is made to have a complete inert gas atmosphere. Functions as a gas nozzle that concentrates on the tip of the workpiece, that is, the molten portion of the work and the filler material.

In the electrode mounting structure according to the present invention, the tungsten electrode 4 is
A plurality of electrode cartridges 1 having a constant protrusion size are prepared. If the welding operation is continued for a long time, wear and damage of the tip portion of the tungsten electrode 4 is inevitable, and the state of arc generation will eventually change. At this point, if the welding operation is temporarily interrupted and the separately prepared electrode cartridge 1 is mounted, the initially set optimum welding conditions are reproduced, and the welding operation can be resumed immediately.

[0017]

According to the electrode mounting structure in the TIG welding machine according to the present invention, it is possible to easily replace a difficult tungsten electrode, which has conventionally had to be interrupted for a long time during the welding operation. In addition, the operation can be performed quickly, and the operation interruption time for electrode replacement and adjustment can be extremely short, so that high-quality welding can be performed efficiently. In particular, in the case of automatic welding, it is important to accurately maintain a constant distance between the electrode tip and the work under constant conditions in performing high-quality and constant welding, but in the present invention, prior to the work, By preparing an electrode cartridge having a constant protrusion size from the tip and replacing the electrode cartridge, the optimum conditions set in this place can be reproduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electrode mounting structure according to the present invention;

FIG. 2 is a longitudinal sectional view of an electrode cartridge,

FIG. 3 is a longitudinal sectional view showing a state where the electrode cartridge of FIG. 2 is mounted on a torch main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrode cartridge, 2 ... Torch body, 3 ... Cartridge body, 4 ... Tungsten electrode, 5 ... Restricted wall, 6 ... Gas passage, 7 ... Collet cylinder, 8 ... Cut, 9 ... Press screw, 10 ... Inert gas supply passage,
11 ... welding head, 12 ... welding current cable, 13 ... mounting hole, 14 ... mounting hole, 15 ... concave peripheral groove, 16 ... gas passage,
17, 20: wire mesh, 18: retaining ring, 19: cap, 19a: short tube.

Claims (3)

[Claims] At least a portion is formed of a good electrical conductor,
An electrode comprising a torch main body 2 connected to a welding power source and having an inert gas supply passage formed therein, and a cylindrical cartridge main body 3 which is detachably attached to the torch main body 2 and is electrically connected to the torch main body by being mounted. Cartridge 1
The cartridge body 3 is provided with fixing means for making the protrusion dimension from the tip constant and detachably attaching the tungsten electrode 4, and at the mounting position, the inert gas supplied to the inert gas supply passage of the torch body 2. An electrode mounting structure in a TIG welding machine, wherein the electrode is guided into the cartridge body 3 and jetted toward the tip of the tungsten electrode 4. 2. A torch main body 2 formed of a good electrical conductor and connected to a welding power source and having an inert gas supply passage formed therein, and an electrode cartridge 1 detachably attached to the torch main body 2. The cartridge 1 has the tungsten electrode 4 loosely penetrated on the center line of the cylindrical cartridge body 3 having the diaphragm wall 5 formed therein, and the cartridge body 3 has an arbitrary floating position in which the tungsten electrode 4 partially projects from the tip. A fixing means for fixing is provided, and the tungsten electrode 4 is electrically connected to a welding power source by forming the fixing means for the cartridge body 3 and the tungsten electrode with an electrically good conductor. The space communicates with the inert gas supply passage of the torch body 2, and a tongue is formed through a gas passage 6 formed in the throttle wall 5. An electrode mounting structure in a TIG welding machine, wherein an inert gas is blown toward the tip of a stainless steel electrode 4. 3. A diaphragm wall 5 through which a tungsten electrode 4 passes freely.
The collet cylinder 7 having a tapered base end wall surface and having a plurality of cuts 8 from the tip is mounted on the tungsten electrode 4, and the collet cylinder 7 is pressed by a pressing screw 9 provided at the base end of the cartridge body 3. 3. The TIG welding machine according to claim 2, wherein the tungsten electrode 4 is fixed by a collet cylinder 7 which presses a base end portion of the base member 7 forward and is guided by a base end side wall surface of a tapered throttle wall 5 and flexes inward. Electrode mounting structure.