Welding torch for milling head sleeve and tungsten-pole inert gas protection welding

Abstract

To provide a TIG (inert gas shielded tungsten arc) welding torch in which the seizure in the contact faces between a collet and a collet body is prevented to facilitate the exchange of an electrode, the phenomenon that arc heat conducts from the electrode to a torch body via the collet body is suppressed and large welding current can be made to flow, and whose using rate can be increased. The TIG welding torch is provided with a torch body, a collet supporting an electrode located at the center of the torch body, and a collet body supported by a metallic member in contact with the inside thereof and supporting the collet in contact therewith. The collet body is composed of a cylindrical insert member fitted to the tip part of the collet body and having a receiving hole of the electrode at an axial core part, and the balance collet body shell having an inserting hole of the collet. The insert member is formed of an electrically conductive metal having high electrical conductivity and having impact resistance and wear resistance. The collet body shell is formed of an electrically conductive metal having low thermal conductivity.

Description

technical field [0001] The present invention relates to a collet body for improving tungsten inert gas shielded welding and a tungsten inert gas shielded welding torch using it. Background technique [0002] [Prior Art 1] [0003] Referring to FIG. 2 , the tungsten inert gas shielded welding torch of prior art 1 will be described. Fig. 2 is a partial sectional view of a tungsten inert gas shielded welding torch in the prior art. In this figure, a torch body 1 is formed of a substantially cylindrical metal member 1a and a substantially cylindrical insulating member 1b surrounding the metal member 1a. The handle part 2 is a part held by the operator, and is attached to the side surface of the torch body 1, and the periphery of the handle part 2 is formed of an insulating member. [0004] The electrode collet (collet) 3 is provided with an electrode through insertion hole 3a for passing through the non-consumable electrode 4 (tungsten electrode) at the shaft core, and a poin...

AI Technical Summary

Problems solved by technology

The resistance value of steel components is higher than that of copper alloys. Therefore, if the welding current exceeds 100A, the electrode rolling head, rolling head sleeve and electrode 4 will break down at the power supply contact part and the arc will be unstable.

In addition, sintering occurs during this period, making electrode replacement difficult

Therefore, the allowable current and usage rate of the torch body 1 are limited

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