A rotary tungsten electrode tig welding system for inner wall welding of extremely small diameter pipe fittings

Abstract

The invention provides a rotary tungsten electrode TIG welding system for welding the inner wall of an extremely small diameter pipe, which is characterized in that it comprises a rotary tungsten electrode TIG welding torch, a high-frequency inverter welding power source, a water cooling device and a protective gas supply device; The variable welding power source includes the main circuit of the power source and the welding control device; the rotating tungsten electrode TIG welding torch includes a conductive rod with a tungsten electrode and a rotary device; the conductive rod is connected with the main circuit of the power source; the main circuit of the power source and the rotary device are respectively connected with the welding control device; The welding control device is connected with the conductive rod through the high-frequency arc striking module; the shielding gas supply device and the water cooling device are respectively connected with the conductive rod. The system can realize the welding of the inner wall of extremely small-diameter pipe fittings, and can solve the problem of water cooling and air supply in narrow spaces. The structure is ingenious and flexible, and has good adaptability to wide working conditions.

Description

technical field [0001] The invention relates to the technical field of welding systems, and more particularly, to a rotary tungsten electrode TIG welding system for welding the inner wall of an extremely small diameter pipe. Background technique [0002] Tungsten Inert Gas Arc Welding (TIG) has stable arc, excellent visibility, no droplet spatter, excellent welding quality, reliable welding process, stable welding effect, and is widely used in various industries, such as aerospace, large ships manufacturing, automotive and nuclear industries. Among them, in the current industrial production, there is a wide range of pipeline welding requirements: for example, in nuclear power plants, there are a large number of pipelines to be repaired in power station condensers and heat exchangers. It is relatively easy to achieve the purpose of welding on the outer wall of the pipe fitting or the inner wall of the pipe fitting with a larger diameter (greater than 50mm), while in nuclear ...

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Problems solved by technology

[0003] When performing welding repair work in narrow spaces such as heat exchangers and condensers with extremely small diameters such as nuclear power plants and super (super) critical power plants, the traditional rotary tungsten electrode TIG welding, its rotary drive device is closely connected with the tungsten electrode, The overall structure is too large, and it is impossible to enter the inside of the ultra-thin pipe for welding

In addition, cooling liquid and shielding gas need to be input during welding. After the welding torch is added with cooling and shielding gas transmission functions, the structural volume will be further increased, and it will be more difficult to enter extremely small diameter pipe fittings for welding

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