Rotary TIG (Tungsten Inert Gas) welding gun for welding and repairing inner wall of pipe with extremely small diameter

Abstract

The invention provides a rotary TIG (Tungsten Inert Gas) welding gun for welding and repairing the inner wall of a pipe with an extremely small diameter. The rotary TIG welding gun comprises a tungsten electrode conducting rod, a long straight conducting shaft and a rotary driving device; the long straight conducting shaft is provided with a gas channel I and a water cooling channel; the tungsten electrode conducting rod is provided with a gas channel II and a gas exhaust hole; the long straight conducting shaft is connected with the tungsten electrode conducting rod, and the first gas channel is communicated with a gas channel II; the long straight conducting shaft is connected with an external power supply; the end, away from the tungsten electrode conducting rod, of the long straight conducting shaft is provided with a gas-water distribution structure used for being connected with an external gas supply device and an external water cooling device; a tungsten electrode is arranged on the tungsten electrode conducting rod; and the long straight conducting shaft is connected with a rotary driving device to realize rotation of the long straight conducting shaft so as to drive the tungsten electrode on the tungsten electrode conducting rod to rotate. According to the welding gun, the diameter of a welding operation part can be effectively reduced, so that the welding gun can enter the pipe with an extremely small diameter for welding operation, the welding requirement under the condition that a welding space is extremely severe is met, and high-quality welding seam forming can be achieved.

Description

technical field [0001] The invention relates to the technical field of TIG welding, and more specifically relates to a rotary TIG welding torch used for welding and repairing the inner wall of a pipe with a very small diameter. Background technique [0002] In the field of welding, TIG welding can achieve high-quality and high-reliability welding, especially in important components in nuclear power, aviation and aerospace industries, such as pressure vessels, turbine rotors, heat exchanger condenser tubes, etc., can Achieve welding quality that cannot be achieved by other welding methods. [0003] At present, in nuclear power projects and petrochemical projects, there are various equipment that need to be welded and repaired on the inner wall of pipe fittings. It is easier to achieve welding on the outer wall of pipe fittings or the inner wall of a pipe with a larger diameter, but when the corresponding equipment space does not allow welding on the outer wall of pipe fittin...

AI Technical Summary

Problems solved by technology

In the traditional rotary tungsten electrode TIG welding, its rotary driving device is closely connected with the tungsten electrode. Although the tungsten electrode can achieve stable rotational movement, the overall structure is too large to enter the inside of the ultra-fine pipe for welding; when TIG welding , requires water-cooled gas supply protection, and due to space limitations inside the small-diameter pipe fittings, it is impossible to directly place the water-cooled gas supply device. Among them, the Chinese utility model patent "A TIG Welding Torch for Deep Hole Welding of Pipe Fittings" (Notice No.: CN211360992U) In the patent, only the ventilation pipe is installed under the welding torch through the tightening bolts, which not only occupies a small internal space of the pipe fittings, but also does not provide a water cooling solution

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