Coaxial hollow tungsten electrode TIG device and welding gun thereof, using method and application

Abstract

The invention discloses a coaxial hollow tungsten electrode TIG device and a welding gun thereof, a using method and application and belongs to the technical field of electric arc additive manufacturing. The welding gun of the TIG device comprises a gun body and a hollow tungsten electrode, wherein the front end of the gun body is provided with a ceramic nozzle. The gun body is internally provided with a protective air cavity, and an air inlet hole communicated with the protective air cavity is formed in the gun body and used for being connected with an air source. The hollow tungsten electrode is arranged in the gun body, the front end of the hollow tungsten electrode extends out of the ceramic nozzle, and the middle of the hollow tungsten electrode is provided with a hollow wire feeding cavity. The side wall of the hollow tungsten electrode is provided with an air hole, and the air hole enables the wire feeding cavity of the hollow tungsten electrode to be communicated with the protective air cavity of the gun body. The welding gun is good in welding wire preheating effect, an additive manufacturing cracking phenomenon is avoided, the deposition efficiency is high, the welding speed is quick, weld defects are fewer, and the welding quality is high. According to the device, superspeed and high-quality electric arc additive manufacturing can be performed, and the device is particularly suitable for additive manufacturing of active metals such as copper and aluminum as well as alloy thereof. According to the using method, high quality weld joints can be obtained, and the welding quality is improved.

Description

technical field [0001] The invention belongs to the technical field of arc additive manufacturing, and relates to a coaxial hollow tungsten electrode TIG welding device suitable for arc additive manufacturing. The application of the device can realize the high-quality and efficient additive manufacturing process of large-sized components based on TIG arc, and more Specifically, it relates to a coaxial hollow tungsten electrode TIG welding device and its welding torch, usage method and application. Background technique [0002] Due to the use of inert gas protection, TIG is a welding method with stable arc combustion and excellent weld quality. It is the preferred welding method for welding parts and precision parts in high-end industrial sectors. However, due to the limited current-carrying capacity of the electrodes in traditional TIG welding, the arc power is limited to a certain extent, and the side-axis wire feeding is used, the weld penetration is shallow, and the weldi...

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Problems solved by technology

[0007] Aiming at the problems of traditional TIG welding such as long residence time, low deposition efficiency, excessive stress and cracking of the deposition site during arc additive manufacturing, the present invention provides a coaxial hollow tungsten electrode TIG welding device and its welding torch. The welding torch adopts The arc cladding process of coaxial hot wire has the advantages of uniform heating and jet transition, which can realize ultra-high-speed and high-quality arc additive manufacturing, especially suitable for additive manufacturing of active metals such as copper, aluminum and their alloys

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