Plasma-arc welding device implemented by aid of TIG (tungsten inert gas) welding method

Abstract

The invention relates to a plasma-arc welding device implemented by the aid of a TIG (tungsten inert gas) welding method. The plasma-arc welding device comprises an upper gun and a lower gun. An upper spray nozzle is connected with the lower end of the upper gun and is mechanically coaxially connected with the lower gun. A water cooling groove is formed in the wall of the upper gun, an upper water inlet pipe, an upper water outlet pipe and an upper gas inlet pipe are arranged in the wall of the upper gun, a flow guide component, a tungsten electrode clamp and a tungsten electrode are coaxially arranged in the upper gun, and the tungsten electrode penetrates the tungsten electrode clamp and extends into the lower gun. A water cooling groove is formed in the wall of the lower gun, a lower water inlet pipe, a lower water outlet pipe and a lower gas inlet pipe are arranged in the wall of the lower gun, a lower spray nozzle is connected with the inner wall of the lower end of the lower gun, pore passages are arranged in the center of the lower spray nozzle, the tail end of the tungsten electrode is separated from each center pore passage of the lower spray nozzle by a certain distance, and a protective cover is connected to the outer wall of the lower end of the lower gun. The plasma-arc welding device has the advantages that plasma-arc welding can be implemented, the TIG welding efficiency and the quality of weld joints can be obviously improved, and the plasma-arc welding device is low in welding cost as compared with the traditional plasma-arc welding.

Description

technical field [0001] The invention relates to a device for realizing plasma arc welding by using a TIG welding method. Background technique [0002] Tungsten argon arc welding (TIG) has the advantages of low welding cost, stable welding process, beautiful weld shape and good protection effect. It has been widely used in production, especially for high-quality non-ferrous metals, stainless steel and titanium alloys. Welding is the most advantageous. However, due to the limited current-carrying capacity of the tungsten electrode, the arc power is restricted, resulting in a shallow molten pool and low welding efficiency. The compression arc welding process born on the basis of TIG welding - plasma arc welding technology (PAW) can significantly improve the low production efficiency of TIG welding. The tungsten electrode of the plasma arc welding torch is retracted into the nozzle, and the aperture of the nozzle is relatively small. When the arc passes through the nozzle hole...

AI Technical Summary

Problems solved by technology

However, because the equipment cost of the plasma welding machine is much higher than that of the TIG welding machine with the same electric power, the one-time investment of the equipment is large; because the structure of the traditional plasma welding torch is complex and heavy, it is not conducive to manual operation

The above two reasons limit the industrial application of plasma arc welding technology

[0004] To sum up, the existing TIG welding technology has low welding efficiency, while the traditional plasma arc welding technology improves the welding productivity, but the welding cost is high, and the welding device is relatively heavy. If the existing TIG welding torch can be modified to realize plasma Arc welding can not only improve the welding efficiency of TIG welding, but also significantly reduce the production cost of plasma arc welding method, and can also enhance the flexibility of plasma arc welding, so it has great application value

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