JP2570553Y2 - Arc welding torch - Google Patents

Description

The present invention relates to an arc welding torch used for a welding operation.

2. Prior Art FIGS. 3a and 3b show examples of a conventional torch for arc welding.
In FIG. 3a, reference numeral 1 denotes a tubular torch main body, and 2 denotes a wire guide for guiding a welding wire 3 to a contact tip 4, which is configured to be freely inserted from one end of the torch main body 1. Reference numeral 5 denotes an annular space provided between the torch main body 1 and the wire guide 2, and serves as a shield gas passage.
Reference numeral 6 denotes a screw formed inside the other end of the torch main body for screwing and fixing the contact tip 4 to the torch main body 1.

FIG. 3B shows another conventional example. Reference numeral 1 denotes a tubular torch main body, which comprises a torch head 1a and a tip body 1b, which are integrally formed by screwing or brazing. 2 is a wire guide, 3 is a welding wire,
Reference numeral 4 denotes a contact tip, and reference numeral 5 denotes a shield gas passage.
Reference numeral 6 denotes a screw formed inside the other end of the torch main body for screwing and fixing the contact tip 4 to the torch main body 1, and reference numeral 7 denotes a small diameter portion for substantially fixing the end of the wire guide body in the radial direction.

Problems to be Solved by the Invention Such a conventional torch has the following problems.

In the conventional example shown in FIG. 3A, the torch main body 1 is processed from an integral tubular member, so that the processing cost is low. However, the inner diameter of the female screw 6 for screwing the contact tip formed on the inside of the other end of the torch body is equal to or larger than the inner diameter of the tubular member. Therefore, the annular space 5 also exists near the outer periphery of the distal end of the wire guide 2. , Wire guide 2
Is in a state where it can move in the radial direction. Therefore, when the wire is fed while the contact tip 4 is screwed, the tip of the wire guide 2 moves in the radial direction, so that the tip of the wire stops at the contact tip entrance end face, or at the contact tip entrance. A defect that the wire 3 is scraped occurs. Furthermore, since the tip of the wire guide 2 is not fixed in the radial direction,
The wire guide body 2 vibrates, so that the wire 3 also vibrates at the contact tip entrance, and the stable contact power supply to the wire 3 at the contact tip 4, which is the most important factor in terms of weldability, is obstructed, resulting in welding defects. .

In the conventional example shown in FIG. 3B, the torch main body 1 is divided into a torch head 1a and a tip body 1b, and the torch head 1a
Is formed from a tubular member, and the tip body 1b is formed from a solid rod or the like, and provided with a female screw 6 for screwing a contact tip and a small diameter portion 7 having an inner diameter smaller than the inner diameter of the torch main body in a portion where the shield gas passage 5 exists. The problem of the prior art shown in FIG. 3a, namely the wire stop at the contact tip entrance,
Problems such as scraping of the wire 3 at the entrance and inhibition of stable contact power supply to the wire 3 due to wire vibration at the entrance are solved. However, the torch body 1 is connected to the torch head 1a,
Since the chip body 1b is divided, these joints may have problems such as heat generation and insufficient strength, and the chip body 1b may be processed from a solid rod. Very high costs due to the need.

Means for Solving the Problems In order to solve the above problems, the arc welding torch of the present invention has a torch main body formed of an integral tubular member of copper or copper alloy, To process a female screw for screwing a contact tip having an inner diameter smaller than the inner diameter, to substantially fix the end of the wire guide in the radial direction by at least the female screw and to screw the end of the wire guide to the female screw. It is designed to be substantially fixed also in the wire feeding direction.

In the above configuration, the distal end of the wire guide is substantially fixed in the radial direction by the female screw or the female screw and the small-diameter portion, and the distal end of the wire guide is moved in the wire feeding direction by the thread of the female screw. Almost fixed.

Embodiment FIG. 1 shows an embodiment according to the present invention.

In FIG. 1, reference numeral 1 denotes a torch main body made of an integral tubular member, which is detachably attached to a connector 9 provided in a holder 8. Here, the torch body 1 is made of copper or a copper alloy material in consideration of electric conductivity and heat conductivity. One end of the torch body 1 (connector mounting side)
Sealing member on the outer circumference to prevent leakage of shielding gas
On the inside of the other end of the torch main body, a female screw 6 for screwing a contact tip having an inner diameter smaller than the inner diameter of the tubular member is machined. Here, the female screw 6 is screwed with the contact tip 4 and, at the same time, the distal end of the wire guide 2 incorporated so as to be freely inserted from one end of the torch body 1 in the radial direction by the inner diameter of the female screw 6. It is fixed. The distal end of the wire guide 2 is substantially fixed in the feeding direction of the wire 3 by the thread of the female screw 6 (as shown in FIG. The wire guide 2 is vibrated at the time of feeding and welding of the wire 3, and the wire guide 2 is moved from the base of the contact tip 4. It is possible to prevent the paper from being pulled out to the opposite side of the feeding direction. As a result, the wire 3 is stably fed to the contact tip 4, and the wire 3 does not vibrate at the entrance of the contact tip 4, so that the contact with the wire 3 at the contact tip 4, which is the most important factor in weldability, is achieved. Since power supply can be performed stably, stable weldability can be obtained. Reference numeral 3 denotes a welding wire which is fed from a wire feeding device (not shown), and is guided to a welding portion via a wire guide 2 and a contact tip 4. Reference numeral 5 denotes an annular space provided between the torch main body 1 and the wire guide 2, and serves as a shield gas passage. Here, the shielding gas is guided from the annular space 5 to a welding portion through a gas ejection hole 11 and a nozzle 12 perforated near the other end of the torch main body. The electric energy required for generating the welding arc is supplied from the torch cable (not shown) and the torch body 1 to the contact tip 4 and is supplied to the welding wire 3 by contact. 13 is an insulating coating for electrically insulating the outside of the torch main body 1, 14
Is an insulating cylinder for electrically insulating the torch body 1 from the nozzle 12.

The processing of the torch body 1 is performed in the steps shown in FIGS. 2a, 2b and 2c. That is, an integral tubular member (FIG. 2a)
First, the inner diameter of the end portion is reduced to a desired diameter by plastic working such as pressing, caulking, or drawing (FIG. 2b), and then, the reduced inner diameter portion has an inner diameter smaller than the inner diameter of the tubular member. 6 and the small-diameter portion 7 are processed, and the outer shape is further processed (FIG. 2c). Thus, the torch main body 1 can be obtained.

Effect of the invention As described above, the torch for arc welding of the present invention is a torch body structure that is inexpensive and has excellent mechanical strength, and also stabilizes the wire feed, and stabilizes the contact power supply to the wire with the contact tip. As a result, stable weldability can be obtained, and industrial benefits are great.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an essential part of a welding torch according to an embodiment of the present invention, and FIGS. 2a, 2b and 2c are front views of an essential part showing a processing step of a tip of a torch body of the welding torch. FIGS. 3a and 3b are cross-sectional views of main parts of a conventional welding torch. DESCRIPTION OF SYMBOLS 1 ... Torch main body, 2 ... Wire guide, 3 ... Welding wire, 4 ... Contact tip, 5 ... Annular space, 6
... female thread, 7 ... small diameter part.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiaki Ueda 1006 Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-61-74784 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A connector provided in a holder, a tubular torch body detachably attached to the connector,
A wire guide body configured to be freely inserted from one end of the torch main body, wherein the torch main body is formed by an integral tubular member of copper or copper alloy, and inside the other end of the torch main body. Arc welding in which a female screw for screwing a contact tip having an inner diameter smaller than the inner diameter of the tubular member is machined, and at least the end of the wire guide is substantially fixed in the radial direction and the wire feeding direction by at least the female screw. For torch.