Gas nozzle for arc welding

Abstract

A simple and inexpensive gas nozzle for arc welding capable of reducing adhesion of sputter and enhancing welding quality and welding workability. A gas nozzle (5) so fixed removably to the torch head (2) of a welding torch (1) as to surround a contact chip (4) for feeding a welding wire (W) is formed of a material, e.g., a pasteboard a part of which is carbonized through adhesion of sputter (S) and comes off together with the sputter (S). When the sputter (S) adheres to the gas nozzle (5) during welding, the adhering part is carbonized because of the heat of the sputter (S) and comes off together with the sputter (S). Consequently, adhesion and deposition of the sputter (S) onto the gas nozzle (5) can be reduced infallibly.

Description

Technical field [0001] The present invention relates to a gas nozzle for arc welding which is mounted on, 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, a welding torch 21 as shown in a schematic cross-sectional view in FIG. 6 is used. The welding torch 21 is configured such that a metal contact tip 24 is detachably screwed and fastened to the tip portion 22a of the insulating torch head 22, and the contact tip 24 is used to supply welding wire 23 as a consumable electrode. At the same time, the base end portion 25a of the metal gas nozzle 25 is detachably fastened and screwed so as to surround the contact tip 24. Thus, the welding wire 23 is used as the electrode on the positive electrode side, and the workpiece W, which is the material to be welded, is used as the electrode on the negative electrode side. While inert gas such as argon is fed into...

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.

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