Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser

Abstract

The invention relates to a hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser, comprising the following steps: firstly fixing a variable-polarity square-wave tungsten electrode argon arc welding gun and a laser beam transmitting gun, providing a workpiece moving at a constant speed, forming a mode of preposing the variable-polarity square-wave tungsten electrode argon arc welding gun, utilizing the electric arc of variable-polarity square-wave tungsten electrode argon arc welding to remove impurities such as oxide films and the like at the surface zone of the welding workpiece, and leading the workpiece to be in a high-temperature melting state; and then leading laser beams to radiate a welded part, thus deepening the depth of fusion in variable-polarity square-wave tungsten electrode argon arc welding and finishing the welding. By utilizing the welding method adopted by the invention, the reflectivity of metal to the laser can be reduced, and the absorptivity of the metal to the laser energy is improved, so that the effective heating depth of the laser is improved, the depth of fusion of welding seams is enlarged, and the width of the welding seams and the width of heat affected zones are effectively reduced, thus finally a welding piece with deeper depth of fusion, very small heat affected zones and attractive appearance can be obtained.

Description

technical field [0001] The invention relates to a method for butt welding of metal plates or profiles such as aluminum alloys, specifically a method for butt welding of metal plates or profiles such as aluminum alloys by using two heat sources of variable polarity square wave tungsten argon arc and laser at the same time A welding method belongs to the technical field of metal welding. Background technique [0002] Aluminum alloy has many advantages such as low density, good plasticity, easy processing and forming, no low-temperature brittle transition and atmospheric corrosion resistance. It is widely used in aviation, aerospace, high-speed rail trains or other vehicles. Its physical and chemical properties determine its unique weldability. [0003] The TIG welding of aluminum alloy requires not only to play the role of cathode cleaning to remove the dense oxide film on the surface, but also to reduce the burning loss of the tungsten electrode and maintain the shape of the...

AI Technical Summary

Problems solved by technology

However, when using laser beams to weld aluminum alloys, due to the high reflectivity of aluminum to lasers and fast heat conduction, it is often necessary to use relatively high-power lasers for welding, resulting in high welding costs, and when laser welding aluminum alloy thick plates, It is also prone to welding defects such as poor stability, pores, cracks, and collapse

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