Laser induced variable polarity square wave tungsten argon arc welding method for small-hole-diameter thin-walled tube

Abstract

The invention belongs to the technical field of metal welding, and particularly relates to a laser induced variable polarity square wave tungsten argon arc welding method for a small-hole-diameter thin-walled tube. The method comprises the following steps that (1) a laser beam emitting gun and a variable polarity square wave tungsten argon arc welding torch are fixed, wherein the laser beam emitting gun is arranged on the front portion, the variable polarity square wave tungsten argon arc welding torch is arranged on the rear portion, and the part needing to be subjected to butting of the to-be-welded thin-walled tube is formed and butted, wherein the variable polarity square wave tungsten argon arc welding torch is located over a to-be-welded part, and the focus of laser beams is aimed atthe middle of the welded part of the to-be-welded workpiece; (2) the to-be-welded thin-walled tube is continuously formed and moved, the laser beams are emitted at first, then variable polarity square wave tungsten argon arc welding torch is ignited, and the to-be-welded part of the to-be-welded thin-walled tube is subjected to cathode cleaning and initial melting through arc spots, so that the surface of the welded part is in a high temperature molten state; and (3) then the laser beams are continuously irradiated to the welded part, and arcs of variable polarity square wave tungsten argon arc welding are continuously induced for completing continuous welding of the thin-walled tube.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a laser-induced polarity-variable square-wave tungsten argon arc welding method for small-aperture thin-walled pipes. Background technique [0002] Stainless steel thin-walled tubes are not easy to rust, and are widely used in electronics, chemicals, food, medicine and other industries; aluminum alloys have the advantages of low density, good plasticity, easy processing, no low-temperature brittle transformation, and atmospheric corrosion resistance, and are widely used in aviation, Structural materials for aerospace, high-speed rail trains or other vehicles. However, because stainless steel is easily polluted by the environment and requires high cleaning before welding; there is a dense oxide film on the surface of aluminum alloy materials, which has unique physical and chemical properties. Unique weldability of non-ferrous metals such as aluminum alloys. [0...

AI Technical Summary

Problems solved by technology

Although this method can increase the penetration depth, improve the welding quality and welding efficiency, the pollutants and oxide films on the surface of the workpiece to be welded will interfere with the arc spots, which will lead to the ionization of the arc in variable polarity square wave argon tungsten arc welding. , poor welding precision

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