JP2007237247A - Welding torch assembly, and method for using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding torch assembly which can be adequately used as a torch for the MIG welding or the TIG welding without changing a torch body. <P>SOLUTION: In the welding torch assembly A1, a welding torch 2 is stored in an outer cylindrical nozzle 1 for ejecting a shield gas. The welding torch 2 comprises a torch body 21 having a wire feed passage 21a inside, a chip body 24 which is mounted on a front end of the torch body 21 while a wire feed hole 24a connected to the wire feed passage 21a is longitudinally penetrated through the torch body, and a power supply chip 26 which is attachably/detachably mounted on a front end of the chip body 24. A power supply chip 26B for the TIG welding having a tungsten electrode 27 on its front end is mounted as the power supply chip 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a welding torch assembly including a plurality of welding torches and a method of using the same.

  Conventionally, MIG (Metal Inert Gas) welding and TIG (Tungsten Inert Gas) welding are known as arc welding techniques performed in an inert gas atmosphere such as argon or helium. MIG welding is a welding technique in which a consumable welding wire is continuously fed into a power feed tip, and an arc generated between the wire and a base material proceeds and proceeds. MIG welding has the advantage that the welding efficiency of the wire with respect to heat input is high and the welding speed is high, and is suitable, for example, for welding thick plates that require a certain welding strength. TIG welding is a welding technique in which an arc is generated between a non-consumable tungsten electrode and a base material, and the filler material and the base material are melted and joined by the arc heat. TIG welding has the advantage that it is easy to adjust the amount of welding because the base metal melting operation and the melt material melting operation can be performed independently by arc, and is suitable for, for example, tack welding of thin plates .

On the other hand, a hybrid type welding torch assembly including a TIG welding torch and a MIG welding torch is known (see, for example, Patent Document 1). In the welding torch assembly disclosed in Patent Document 1, a TIG welding torch and a MIG welding torch are arranged inside one outer cylinder nozzle with an insulator interposed therebetween, and a welding power source is alternately provided to both torches. By being supplied to, it is possible to perform welding having both characteristics of TIG welding and MIG welding.

  However, with the configuration described in Patent Document 1, it is difficult to cope with the case where it is desired to increase the thickness of the weld bead in order to improve the welding strength. For example, in a series of welding operations performed on a workpiece, first, temporary attachment is performed on a thin plate, and then, when a thick weld bead is formed on the thick plate, Patent Document This can be dealt with by mainly performing TIG welding using the welding torch assembly described in 1. However, with regard to thick plate welding, since the number of wires to be supplied is one in the welding torch assembly of the same document, the supply amount of wires is insufficient, and it is difficult to increase the thickness of the weld bead. For this reason, for example, it is necessary to prepare a tandem MIG welding apparatus equipped with two MIG welding torches and perform the welding operation after switching to the welding apparatus. Therefore, in such a case, working efficiency is reduced and the welding equipment is enlarged.

JP 63-101082 A

  The present invention has been conceived under such circumstances, and provides a welding torch assembly that can be appropriately used as a torch for MIG welding or TIG welding without replacing the main body of the torch. The main task is to do. Another object of the present invention is to provide a welding torch assembly that can be used as appropriate for tandem MIG welding, TIG-MIG hybrid welding, or tandem TIG welding without replacing the torch body.

  In order to solve the above problems, the present invention employs the following technical means.

  A welding torch assembly provided by the first aspect of the present invention is a welding torch assembly in which a welding torch is accommodated in an outer cylinder nozzle for injecting a shielding gas, and the welding torch includes a wire feeding path. A torch body, a tip body that is attached to the tip of the torch body and that has a wire feed hole extending through the wire feed path, and a power supply that is detachably attached to the tip of the tip body And a TIG welding power supply tip having a tungsten electrode at the tip is attached as the power supply tip.

  The welding torch assembly provided by the second aspect of the present invention is a welding torch assembly in which a plurality of welding torches are accommodated in an outer cylinder nozzle for injecting a shielding gas, and each welding torch has a wire feed A torch body having a feeding path inside, a tip body attached to the tip of the torch body and having a wire feed hole extending through the wire feeding path, and a tip body detachably attached to the tip of the tip body The at least one of the plurality of welding torches is characterized in that a TIG welding power supply tip having a tungsten electrode at the tip is attached as the power supply tip.

  A welding torch assembly provided by the third aspect of the present invention is a welding torch assembly in which a plurality of welding torches are accommodated in an outer cylinder nozzle for injecting a shielding gas. A torch body having a feeding path inside, a tip body attached to the tip of the torch body and having a wire feed hole extending through the wire feeding path, and a tip body detachably attached to the tip of the tip body And at least one of the plurality of welding torches has a TIG welding power supply tip having a tungsten electrode at the tip as the power supply tip, and the plurality of welding torches. At least one other of the above has a wire feed hole connected to the wire feed hole as the power feed tip. Is characterized by transmural feeding chip MIG welding is attached.

  According to the welding torch assembly having such a configuration, it is possible to easily switch between different welding methods (MIG welding and TIG welding) by replacing only the power feed tip in each welding torch. Therefore, in a series of welding operations performed on the workpiece, it is possible to suppress a decrease in work efficiency even when the welding technique is switched halfway. Further, when switching the welding technique, the configuration other than the power feed tip can be shared, so that space saving and cost reduction of the welding equipment can be achieved.

  In a preferred embodiment of the present invention, the TIG welding power feed tip is slightly smaller than the outer diameter of the tungsten electrode on the tip side of the MIG welding power feed tip through which the wire feed hole connected to the wire feed hole passes. An inner diameter is drilled and a tungsten electrode is fitted into the hole.

  According to such a configuration, a TIG welding power supply tip having a tungsten electrode can be obtained by performing a simple modification on the front end side of the MIG welding power supply tip.

  A method for using a welding torch assembly provided by the fourth aspect of the present invention is a method for using a welding torch assembly in which one or a plurality of welding torches are accommodated in an outer nozzle for ejecting a shielding gas. Each welding torch includes a torch body having a wire feeding path therein, and a tip body that is attached to the tip of the torch body and through which a wire feeding hole connected to the wire feeding path passes vertically, As the power supply tip attached to the tip of the tip body, two types are prepared: a power supply tip for MIG welding in which a wire delivery hole connected to the wire feed hole passes vertically, and a power supply tip for TIG welding having a tungsten electrode at the tip, If necessary, the MIG welding power supply tip or the TIG welding power supply tip is attached to each welding torch. It is characterized by mounting selects either the.

  Such a method of use is suitable for efficiently performing different welding techniques using the welding torch assembly according to the first and second aspects of the present invention.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

  A preferred embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 shows an example of a welding torch assembly according to the present invention. The welding torch assembly A1 is a component part of a tandem MIG welding apparatus including a welding power supply device, a current / voltage controller, a wire feeding device, a shield gas cylinder, and the like. A welding torch 2 and a fastening fitting 3 are provided.

  The outer cylinder nozzle 1 is made of, for example, a copper-based metal material such as brass, and is configured to interpolate two welding torches 2. The outer cylinder nozzle 1 is configured such that an inert gas such as argon or helium as a shielding gas is supplied from a shielding gas cylinder (not shown). When the shielding gas is supplied to the outer cylinder nozzle 1, the shielding gas is ejected from the tip of the outer cylinder nozzle 1 through the gap between the outer cylinder nozzle 1 and each welding torch 2.

  Each welding torch 2 includes a torch body 21, a joint 22, a cap nut 23, a tip body 24, a coil liner 25, and a power feed tip 26, and the upper end of the torch body 21 and the fastening bracket 3 are connected to each other. It is fixed to the fastening bracket 3 with

  The torch body 21 has a wire feed path 21a extending vertically. A cylindrical joint 22 is fitted and fixed to the lower end of the torch body 21. A male screw (not shown) is formed on the outer periphery of the joint 22, and a plurality of notches 22 a along the axial direction are formed at the lower end of the joint 22. The joint 22 is provided with an insulating property so that the two welding torches 2 are insulated from each other.

  The chip body 24 has a wire feed hole 24a extending vertically. A plurality of projecting portions 24 b projecting outward are formed on the upper portion of the chip body 24. The tip body 24 is mounted on the torch body 21 by screwing the cap nut 23 onto the male screw on the outer periphery of the joint 22 in a state where the protruding portion 24 b is engaged with the notch portion 22 a of the joint 22. In this mounted state, the wire feeding path 21a of the torch body 21 and the wire feeding hole 24a of the tip body 24 are in communication. A female screw 24 c is formed at the lower end of the wire feed hole 24 a of the chip body 24.

  The coil liner 25 is for guiding the wire fed to the welding torch 2 to the power feed tip 26, and is a flexible cylinder. The coil liner 25 is inserted across the wire feed path 21 a of the torch body 21 and the wire feed hole 24 a of the tip body 24, and the tip thereof extends to the vicinity of the upper end of the power feed tip 26. That is, when a wire is fed into the coil liner 25, the wire appropriately reaches the power supply chip 26.

  The power feed tip 26 is a member to which a current voltage (welding power source) is supplied independently from a power supply device (not shown), and a male screw 26c is formed at the upper end thereof. The power supply chip 26 is detachably attached to the chip body 24 by the male screw 26c being screwed onto the female screw 24c of the chip body 24. In the present embodiment, as the power supply tip 26, either one of the MIG welding power supply tip 26A for performing MIG welding or the TIG welding power supply tip 26B for performing TIG welding is selectively used.

  In the welding torch assembly A1 shown in FIG. 1, the MIG welding power supply tip 26A is mounted on the welding torch 2 on the right side of the drawing, and the TIG welding power supply tip is attached on the welding torch 2 on the left side of the drawing. 26B is installed.

  As shown in FIG. 2, the MIG welding power supply tip 26 </ b> A is formed with a wire feed hole 26 d for feeding a wire supplied from one end to the other end so as to pass through.

  The power supply tip 26B for TIG welding is produced by modifying the power supply tip 26A for MIG welding. As shown in FIG. 3, a counterbore hole with a predetermined diameter formed at the tip of the wire delivery hole 26d. 26e, a tungsten electrode 27 fitted in the counterbore 26e, and a set screw 28 screwed from the side surface of the chip. As a procedure for producing the TIG welding power supply tip 26B, for example, first, a counterbored hole is drilled to a predetermined depth using a drill having a diameter slightly smaller than the outer diameter of the tungsten electrode 27 from the distal end side of the MIG welding power supply tip 26A. Apply. Next, an internal thread 26f that penetrates from the side surface of the chip to the counterbore 26e is formed. Next, the tungsten electrode 27 is press-fitted into the counterbore 26e. Next, the set screw 28 is screwed into the female screw 26f and the tip of the set screw 28 is bitten into the tungsten electrode 27, whereby the tungsten electrode 27 is screwed. In the configuration in which the tungsten electrode 27 is screwed in this way, even if the counterbore hole 26e is expanded due to thermal expansion during welding, the tungsten electrode 27 is prevented from falling off the counterbore hole 26e. Thus, since both the MIG welding power supply tip 26A and the TIG welding power supply tip 26B have the same male screw 26c, they can be selectively attached to the tip body 24 of the welding torch 2.

  Next, an example of a method of using the welding torch assembly A1 having the above configuration will be described with reference to FIGS.

  First, prior to the start of welding work, the same number of MIG welding power supply tips 26A and TIG welding power supply tips 26B as the number of welding torches 2 are prepared. In the present embodiment, two MIG welding power supply tips 26A and two TIG welding power supply tips 26B are prepared.

  In the present embodiment, one of the two types of chips 26A and 26B is mounted on each welding torch 2 in accordance with the welding quality required for the welded portion, and the welding operation is performed.

  For example, when TIG-MIG welding is performed first, as shown in FIG. 1, a TIG welding power supply tip 26B is attached to one of the two welding torches 2, and a MIG welding power supply tip 26A is attached to the other. Installing. And the welding power supply which has a constant current characteristic is supplied with respect to the electric power feeding chip | tip 26B for TIG welding. The MIG welding power supply tip 26A is supplied with a welding power source having a constant voltage characteristic and a wire. A shield gas is ejected from the tip of the outer cylinder nozzle 1. Thereby, TIG-MIG hybrid welding in which TIG welding and MIG welding proceed simultaneously can be appropriately executed.

  Next, when performing TIG-TIG welding (tandem TIG welding), the MIG welding power supply tip 26A attached to one welding torch 2 is removed, and instead, the TIG welding power supply tip 26B is replaced with the welding torch 2. (See FIG. 4). Then, a welding power source having a constant current characteristic is supplied to both TIG welding power supply tips 26B. A shield gas is ejected from the tip of the outer cylinder nozzle 1. Thereby, tandem TIG welding can be performed appropriately.

  Next, when performing MIG-MIG welding (tandem MIG welding), the TIG welding power supply tip 26B attached to both welding torches 2 is removed, and instead, the MIG welding power supply tip 26A is attached to both welding. Attached to the torch 2 (see FIG. 5). Then, a welding power source having a constant voltage characteristic is supplied to both of the TIG welding power supply tips 26A, and a wire is fed. A shield gas is ejected from the tip of the outer cylinder nozzle 1. Thereby, tandem MIG welding can be performed appropriately.

  As can be understood from the above, according to the welding torch assembly A1 of the present embodiment, by replacing only the power supply tip 26, various types of welding (tandem MIG) can be performed while the welding apparatus including the torch body is also used. Welding, TIG-MIG hybrid welding and tandem TIG welding) can be performed. Therefore, in a series of welding operations performed on the workpiece, the welding method can be easily switched in the middle, and a reduction in work efficiency can be suppressed. In addition, when performing tandem MIG welding, TIG-MIG hybrid welding, and tandem TIG welding, it is not necessary to prepare a welding apparatus for each welding method, so that space saving and cost reduction of welding equipment should be achieved. Can do.

  In the present embodiment, the TIG welding power supply tip 26 </ b> B having the tungsten electrode 27 is obtained by performing a unique modification on the tip side of the MIG welding power supply tip 26 </ b> A. And the attachment part (male screw 26c) with respect to the welding torch 2 of the electric power feeding tip 26A for MIG welding and the electric power feeding tip 26B for TIG welding is made common. Therefore, such a configuration is suitable for easily switching the welding method.

  As mentioned above, although embodiment of this invention was described, the range of this invention is not limited to above-described embodiment. The specific configuration of each part of the welding torch assembly according to the present invention can be variously modified without departing from the spirit of the invention.

  In the above embodiment, the configuration including two welding torches has been described. However, the welding torch assembly according to the present invention may be configured to include only one welding torch, or three or more weldings. The structure provided with a torch may be sufficient. In this case, as the power supply tip attached to each welding torch, either the MIG welding power supply tip or the TIG welding power supply tip can be selectively attached.

It is a longitudinal cross-sectional view which shows an example of the welding torch assembly which concerns on this invention. It is a longitudinal cross-sectional view of the power supply tip for MIG welding. It is a longitudinal cross-sectional view of the electric power feeding tip for TIG welding. It is a longitudinal cross-sectional view which shows an example of the usage method of the welding torch assembly which concerns on this invention. It is a longitudinal cross-sectional view which shows an example of the usage method of the welding torch assembly which concerns on this invention.

Explanation of symbols

A1 Welding torch assembly 1 Outer cylinder nozzle 2 Welding torch 21 Torch body 21a Wire feed path 24 Tip body 24a Wire feed hole 26 Feed tip 26A MIG welding feed tip 26B TIG welding feed tip 26d Wire feed hole 26e Counterbore 27 Tungsten electrode

Claims (6)

A welding torch assembly in which a welding torch is accommodated in an outer nozzle for ejecting a shielding gas,
The welding torch includes a torch body having a wire feeding path therein, a tip body attached to a tip of the torch body and having a wire feeding hole extending through the wire feeding path, and a tip body of the tip body. It has a power supply chip that is detachably attached to the tip,
A welding torch assembly, wherein a TIG welding power supply tip having a tungsten electrode at a tip is attached as the power supply tip. A welding torch assembly in which a plurality of welding torches are accommodated in an outer nozzle for ejecting a shielding gas,
Each welding torch includes a torch body having a wire feed path therein, a tip body attached to the tip of the torch body and having a wire feed hole connected to the wire feed path, and a tip body of the tip body. It has a power supply chip that is detachably attached to the tip,
At least one of the plurality of welding torches is provided with a TIG welding power supply tip having a tungsten electrode at a tip as the power supply tip. A welding torch assembly in which a plurality of welding torches are accommodated in an outer nozzle for ejecting a shielding gas,
Each welding torch includes a torch body having a wire feed path therein, a tip body attached to the tip of the torch body and having a wire feed hole connected to the wire feed path, and a tip body of the tip body. It has a power supply chip that is detachably attached to the tip,
At least one of the plurality of welding torches has a TIG welding power supply tip having a tungsten electrode at the tip as the power supply tip, and at least one other of the plurality of welding torches is A welding torch assembly, wherein a power feed tip for MIG welding, in which a wire feed hole connected to the wire feed hole passes vertically, is attached as the power feed tip.   In the TIG welding power feed tip, a hole having an inner diameter slightly smaller than the outer diameter of the tungsten electrode is formed on the tip side of the MIG welding power feed tip through which the wire feed hole connected to the wire feed hole passes. The welding torch assembly according to any one of claims 1 to 3, wherein the welding torch assembly is configured by fitting a tungsten electrode. A method of using a welding torch assembly in which one or a plurality of welding torches are accommodated in an outer cylinder nozzle for injecting a shielding gas,
Each welding torch includes a torch body having a wire feeding path therein, and a tip body attached to the tip of the torch body and through which a wire feeding hole connected to the wire feeding path passes vertically,
As the power supply tip attached to the tip of the tip body, two types are prepared: a power supply tip for MIG welding in which a wire delivery hole connected to the wire feed hole passes vertically, and a power supply tip for TIG welding having a tungsten electrode at the tip. A method of using a welding torch assembly, wherein if necessary, either one of the MIG welding power supply tip or the TIG welding power supply tip is selected and attached to each welding torch. .   In the TIG welding power feed tip, a hole having an inner diameter slightly smaller than the outer diameter of the tungsten electrode is formed on the tip side of the MIG welding power feed tip through which the wire feed hole connected to the wire feed hole passes. The method of using a welding torch assembly according to claim 5, wherein the welding torch assembly is constructed by fitting a tungsten electrode.

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