Welding gun for coupling active TIG welding of gas weld pool

Abstract

The invention provides a welding gun for coupling active tungsten inert gas (TIG) welding of a gas weld pool. A contact tube (4) is arranged in a contact tube accommodating cavity (a); a tungsten electrode chuck (3) is arranged in the contact tube (4); a boss (beta) is arranged outside the contact tube (4); the outer wall of a threaded sleeve (1) is connected with the inner wall of the contact tube (4) and pre-fastened with a tungsten electrode; the upper part of the threaded sleeve (1) is connected with an inner-layer gas inlet tube; a gasket (2) is sleeved on the lower part of the threaded sleeve (1); the tungsten electrode chuck (3) is arranged inside the contact tube (4); the tungsten electrode is fixed in the tungsten electrode chuck (3); an inner nozzle (7) is connected with the lower end of the contact tube (4); an outer nozzle (8) is connected with the outer part of a gun body (5) through a screw thread; an outer-layer gas inlet tube (11) is arranged on the side wall of the gun body (5) and introduced into a gas chamber through a channel formed on the side wall; and a first gas sieve (9) and a second gas sieve (10) are fixed between the boss (beta) and a boss (c) inside the gun body (5) respectively.

Description

technical field [0001] The present invention relates to welding devices. Background technique [0002] Tungsten argon arc welding, or TIG welding (Tungsten Inert Gas welding), is a welding method widely used in modern industrial manufacturing. It has excellent welding quality, but this method also has obvious limitations, that is, the welding penetration is shallow, The single-pass welding penetration is generally below 3mm, which restricts its application to a certain extent. The proposal of the active welding method represented by A-TIG welding (Activating flux TIG welding) not only fully retains the advantages of argon tungsten arc welding, but also doubles the penetration depth by introducing active elements into the conventional TIG welding process , has aroused widespread attention at home and abroad. In active welding, there are two main mechanisms for active elements to increase penetration, namely arc shrinkage and temperature coefficient change of molten pool met...

AI Technical Summary

Problems solved by technology

Although these three methods can significantly increase the depth of penetration, in practical applications, the first method needs to develop different active agents for different base metals, and the active agent is usually applied manually in production, which increases the Reduce the cost and reduce the production efficiency and process stability

In the second type of method, if the active mixed gas is used to directly protect the molten pool, the content of the active component carbon dioxide or oxygen in the mixed gas needs to be controlled within a very low range of 0.1%--0.3%, which requires very high precision. High gas proportioner, and there is tungsten oxidation phenomenon, and the service life is shortened; if two layers of gas are used for welding, the outer layer is an active mixed gas, the active element O is introduced to increase the penetration depth, and the inner layer is helium to protect welding Melt pool to prevent oxidation of tungsten

Although this method no longer needs to control the carbon dioxide or oxygen in the active mixed gas to a very low content, does not require a high-precision gas proportioner, and prevents the oxidation of the tungsten electrode, but because helium is used for the protection of the molten pool, welding High cost

The third type of method requires two arcs, resulting in poor energy saving effect, and may increase equipment investment or lower production efficiency than the second active element introduction method

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