TIG welding gun for water cooling of inner part of tungsten electrode based on negative electrode compression influence

Abstract

The invention relates to a tungsten electrode argon arc welding gun, and discloses a TIG welding gun for water cooling of the inner part of a tungsten electrode based on negative electrode compression influence. The TIG welding gun comprises a central column, wherein the upper part of the central column is connected with a tail cover and the lower part of the central column is connected with a base of the tungsten electrode; the lower part of the base of the tungsten electrode is connected with a tungsten electrode head with a hole, wherein the tungsten electrode head with the hole is provided with a tungsten electrode head inner hole chamber; a sleeve is arranged at the outer part of the central column; a gap gas channel is formed between the sleeve and the central column; a protective gas cover is connected to the lower part of the sleeve; a water outlet pipe, a water inlet pipe and a gas inlet pipe are assembled on the tail cover, a water returning hole corresponding to the water outlet pipe, a water inlet hole corresponding to the water inlet pipe, and a ventilation hole corresponding to the gas inlet pipe are formed in a gun body, and a gas stilling chamber which communicates with the gap gas channel is arranged in the gun body; a water guiding pipe is connected to the bottom of the central column; a water spray nozzle which communicates with the water inlet hole is arranged on the water guiding pipe; a cooling water channel and a protective gas channel are isolated through an upper sealing ring and a lower sealing ring. According to the TIG welding gun disclosed by the invention, cooling fluid is directly injected in the tungsten electrode, and the tungsten electrode is strongly cooled, so that the area of a negative electrode region can be compressed, strong compression of an arc column is realized, the penetrating capacity of an electric arc is improved, and a welding electric arc has a good penetrability.

Description

technical field [0001] The invention relates to a tungsten argon arc welding torch, in particular to a TIG welding torch which improves the arc performance based on the cathode compression effect and directly water-cools the tungsten electrode head, which can improve the welding efficiency. Background technique [0002] Tungsten argon arc welding (TIG) is a high-quality welding process widely used in industrial production, but due to the use of free arc as a heat source, the penetration depth is shallow, the welding speed is small, and the welding efficiency is very low. There is an urgent need to improve and optimize TIG welding, restrict the arc diameter, increase the arc energy density and arc pressure, thereby significantly increasing the penetration depth, and finally greatly improving the welding efficiency. [0003] In plasma arc welding, the direct cooling of the arc column through the water-cooled copper nozzle is an effective measure to compress the arc diameter. ...

AI Technical Summary

Problems solved by technology

However, the manufacturing cost of the plasma arc welding torch is relatively high; the current carrying capacity of the copper nozzle is limited, and it is easy to form double arcs; and the arc blowing force is too large due to direct compression of the arc column, and the stability of the small hole in the process of welding workpieces with a thickness exceeding 6mm is poor.

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