Tungsten electrode inert gas protected welding gun in double-layered airflow structure

Abstract

The invention belongs to the technical field of welding, in particular to a tungsten electrode insert gas protected welding gun in a double-layered airflow structure, which is suitable for a TIG (Tungsten Inert Gas) welding process and solves the problems of shallow weld penetration and easy tungsten electrode oxidation and burning under the protection of mixed gases of common TIG welding. A gun body of the welding gun is internally provided with a gas splitter which is internally provided with an inner layer gas passage, and an outer layer of the gun body is provided with an outer layer gas passage. The double-layered airflow structure of the welding gun is characterized in that a traditional TIG welding gun with a single gas passage is changed and designed into double layer air passages, a pure inert gas is adopted as the inner layer gas to protect the electrode, a mixed gas of the inert gas and an active gas is adopted as the outer layer gas, active components are transited to a melting bath to change a heat transfer convection mode of the melting bath and deepen the depth of the melting bath. The welding gun can increases the depth of the TIG welding melting bath by 2-3 times compared with the common arc welding, simultaneously avoid the tungsten electrode from being oxidized and burnt and improve the welding efficiency.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a tungsten inert gas shielded welding torch with a double-layer gas flow structure, which is a novel welding torch for improving the depth of TIG welding molten pool and preventing electrode oxidation. Background technique [0002] Tungsten inert gas welding (TIG) has the advantages of stable welding process and good protective effect, and has been widely used, especially suitable for welding stainless steel, titanium alloys and non-ferrous metals. Its disadvantages are that the current carrying capacity of the tungsten electrode is limited, and the depth of the molten pool (depth of penetration) is shallow. Usually, the ratio of the depth to width of the molten pool (depth-to-width ratio) is only about 0.2, and the weldable thickness of a single pass is only about 3mm. Even if the welding specification (high current, low speed) is increased, the increase in the width of the mol...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a tungsten inert gas shielded welding torch with a double-layer gas flow structure, which solves the problems of shallow penetration of ordinary TIG welding and easy oxidation and burning of tungsten under the protection of mixed gas.

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