Exchangeable wearing part for an arc welding torch, holder for an exchangeable wearing part, and an arc welding torch having such a corresponding wearing part and holder

Abstract

The invention relates to an exchangeable wearing part of an arc welding torch, said wearing part being intended to be arranged in the region of an end, provided for carrying out a welding process, ofthe arc welding torch, wherein the wearing part is provided with a thread on an outer lateral surface and / or on a boundary wall of a recess, an improvement in heat transfer properties and, when such components are conducting, also improved power transmission properties are intended to be achievable. To this end, the invention proposes that, in the direction of a longitudinal axis of the wearing part, a first conical portion, having the thread provided for fastening the wearing part, of the lateral surface or of the boundary wall is followed, on the same lateral surface or boundary wall, by a thread-free second conical portion of the lateral surface or of the boundary wall.

Description

technical field [0001] The invention relates to a replaceable wear part of an arc welding torch, which is particularly suitable for being arranged in the region of the arc welding torch close to the end of the welding process, wherein the wear part has a preferably centrally located Recess for arranging a further replaceable wear part and / or for accommodating a welding electrode and / or for conveying shielding gas, and the outer envelope surface or boundary wall of the recess of the wear part A conical section is provided which has a thread. Background technique [0002] There are a large number of different welding processes. The invention has particular significance for arc welding. Arc welding is based on the heating of the arc between the electrode and the workpiece to be welded. The workpieces to be welded can be locally melted by heating. In almost all arc welding processes, a shielding gas is supplied to the area of ​​the arc in order to achieve, on the one hand, a...

AI Technical Summary

Problems solved by technology

[0010] All previously known gas nozzles which are held in the arc welding torch, for example contact nozzles held on the nozzle holder, as well as gas nozzles which are usually fixed exchangeably by means of threads, have the disadvantage that even when they are set for current transmission However, the heat transfer and current transfer to the arc welding torch on other components in contact with it still cannot be satisfied

High current transfer resistance and unfavorable heat transfer lead to temperature rises in components often used as replaceable wear parts

The high temperatures during the welding process are in turn responsible for excessive temperature variations between when the arc torch is in use and when it is not in use, which in turn can often lead to unintentional separation of the aforementioned components

This in turn can be the cause of poor quality of the welded connections produced and failures of the welding equipment

High temperatures can likewise lead to increased wear of these components, with the result that the service life is disadvantageously shortened

In addition to the increased cost of the wear parts themselves, additional increased costs arise from increased downtime and more frequent maintenance operations for the arc torches and, where appropriate, the automated manufacturing equipment that the arc torches operate on

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