Non-contact arc ignition welding gun for vacuum electric arc welding of hollow cathode

Abstract

The invention belongs to welding technology and relates to a non-contact arc ignition welding gun capable of realizing stable arc ignition and used for vacuum electric arc welding of a hollow cathode. A hollow cathode of the welding gun is directly inserted into central holes of an outer barrel support and an inner barrel support; an outer barrel component of the welding gun comprises an outer barrel water inlet pipe, an outer barrel water outlet pipe, an outer barrel connecting terminal, a hollow barrel wall and an outer base plate; an inner barrel component of the welding gun comprises an air inlet pipe, an inner barrel connecting terminal, an inner barrel water inlet pipe, an inner barrel water outlet pipe, a barrel wall and an inner base plate; the outer barrel component and the innerbarrel component of the welding gun are separated through an insulating bush; and an arc ignition auxiliary circuit is accessed between the outer barrel connecting terminal and the inner barrel connecting terminal. The hollow cathode is arranged in a closed system between the outer barrel and the inner barrel of the welding gun, thereby preventing the hollow cathode from being polluted by metal vapor due to exposing in electric arc; and the welding gun adopts a bi-channel water cooling system, therefore, the cooling effect is good, the working reliability of the electric arc is high, the service life of the welding gun and the hollow cathode is long, and the stable work of the welding control system is ensured.

Description

technical field [0001] The invention belongs to welding technology, and relates to a non-contact arc-starting torch for hollow cathode vacuum arc welding which can realize stable arc-starting. Background technique [0002] Hollow Cathode Vacuum Arc Welding (HCVAW) is a novel welding process. Vacuum arc is a heat source for local heating. Under the condition of small current, the arc diverges in a "conical" shape. It can be used as a local heat source for small-area vacuum brazing. It has a wide range of applications in the manufacture and repair of aero-engine hot end components. Application prospect: Under high current conditions, the arc is "columnar" and has good energy accumulation. It can be used as a welding heat source for high-quality welding of various refractory and easily oxidized metals under vacuum conditions. [0003] The hollow cathode torch is the core component of the hollow cathode vacuum arc welding method. Its performance is directly related to the stabi...

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Problems solved by technology

However, in the structure of the welding torch involved in this patent, the element for heating the hollow cathode cannot be removed after the arc is struck, and the high temperature radiation of the hollow cathode in the arc operation is likely to cause damage to the heating element; at the same time, the hollow cathode is exposed to arc steam, which is easy Contaminated by the vapor of the metal material to be welded, the performance of the hollow cathode torch is reduced and the life of the hollow cathode is shortened

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