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Gas nozzle for arc welding

A gas nozzle, arc welding technology, applied in arc welding equipment, welding equipment, welding accessories, etc., can solve the problems of obstructing the flow of shielding gas, reducing welding quality, burning torch 21, etc., to improve welding quality and welding operation. performance, ensure protection, and achieve the effect of welding quality

Inactive Publication Date: 2009-07-29
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spatter S deposited on the gas nozzle 25 may hinder the flow of the shielding gas, deteriorating the protection during welding, causing voids such as pores or pits to be generated at the welding position, and reducing the welding quality.
[0004] In addition, the spatter S will also adhere and accumulate on the surface of the contact tip 24, and connect with the spatter S attached to the gas nozzle 25, so that the contact tip 24 and the gas nozzle 25 are electrically connected through the spatter S, which may cause When the nozzle tip portion 25b of the gas nozzle 25 comes into contact with the workpiece W, a short circuit occurs, sparks are generated, and the welding torch 21 is burned or the workpiece W is damaged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0033] figure 1 It is a schematic cross-sectional view of a welding torch equipped with a gas nozzle according to the first embodiment of the present invention.

[0034] In this welding torch 1, on the front end 2a of the welding torch head 2, a metal contact tip 4 is detachably screwed and fastened, which is used to supply the welding wire 3 as a consumable electrode, and at the same time, the base of the gas nozzle 5 The end portion 5a is screwed and fastened to the front end portion 2a of the torch head 2, and a gas nozzle 5 is detachably installed in a manner surrounding the contact tip 4. The nozzle tip portion 5b on the outlet side is formed in a cylindrical shape.

[0035] And, with the welding wire 3 as the electrode on the positive side and the workpiece W as the electrode on the negative side, argon gas, CO 2 Using an inert gas as a shielding gas, an arc is generated between the welding wire 3 and the workpiece W, and the welding wire 3 is melted by the heat to we...

no. 2 Embodiment approach

[0042] figure 2 It is a schematic cross-sectional view of a welding torch equipped with a gas nozzle according to a second embodiment of the present invention.

[0043] In this embodiment, on the basis of the first embodiment, the gas nozzle 5 is composed of a cylindrical metal base end side nozzle 6 whose base end 6a is detachably screwed and fastened to the welding torch. On the front end portion 2a of head 2; And front end side nozzle 7, its base end portion 7a is bonded on the end surface 6c of the front end portion 6b of this base end side nozzle 6 freely, and this front end side nozzle 7 is made of cardboard Composition, the cardboard is carbonized due to the attachment of spatter S, and the carbonized part will fall off together with the spatter S, the front end side nozzle 7 is from the base end part 7a side to the nozzle front end part as the gas ejection side 7b is formed in a cylindrical shape, because other structures of the welding torch 1 and figure 1 Since t...

no. 3 Embodiment approach

[0046] image 3 It is a schematic cross-sectional view of a welding torch equipped with a gas nozzle according to a third embodiment of the present invention.

[0047] In this embodiment, on the basis of the second embodiment, the base end portion 7a of the front end side nozzle 7 is adhered to the inner peripheral surface 6d of the front end portion 6b of the base end side nozzle 6 in an insertable / detachable manner, and the welding torch 1 other structures with figure 2 same, by pairing with figure 2 Corresponding parts are denoted by the same reference numerals, and a detailed description of the parts is omitted.

[0048] According to this embodiment, in addition to obtaining the same effect as the second embodiment, compared with the case where the distal end side nozzle 7 is bonded to the distal end surface 6c of the proximal end side nozzle 6 as in the second embodiment, it is possible to use Insertion of the tip nozzle 7 becomes easier, and this replacement work ca...

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Abstract

The present invention provides a gas nozzle for arc welding, which is simple and inexpensive, can reduce the adhesion of spatter, and can improve welding quality and welding workability. A gas nozzle (5) detachably mounted on the welding torch head (2) of the welding torch (1) in a manner surrounding the contact tip (4) for feeding the welding wire (W), formed of a paper-like material , the paper-like material will be carbonized due to the attachment of the spatter (S), and the carbonized part will fall off together with the spatter (S). As the paper-like material, for example, cardboard can be used. Since during welding, if spatter (S) adheres to the gas nozzle (5), the adhered part is carbonized by the heat of the spatter (S), and the carbonized part falls off together with the spatter (S), so reliable Minimize the adhesion and accumulation of spatter (S) to the gas nozzle (5).

Description

technical field [0001] The present invention relates to a gas nozzle for arc welding that is attached to, for example, a welding torch of a consumable electrode type arc welding machine. Background technique [0002] For example, in consumable electrode arc welding such as MIG welding, using such as Image 6 The welding torch 21 shown in schematic cross-section. The welding torch 21 is configured such that a metal contact tip 24 for supplying a welding wire 23 serving as a consumable electrode is detachably screwed and fastened to a front end portion 22 a of an insulating torch head 22 . At the same time, the base end portion 25 a of the gas nozzle 25 made of metal is detachably screwed and fastened so as to surround the contact tip 24 . Thus, with the welding wire 23 as the electrode on the positive electrode side and the workpiece W as the electrode to be welded as the electrode on the negative electrode side, while sending an inert gas such as argon gas into the gas nozz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/29
CPCB23K9/293B23K9/325B23K9/295B23K9/29
Inventor 千吉良美利
Owner SUBARU CORP
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