Laser welding method for high-reflecting material

Abstract

The invention belongs to the technical field of high-reflecting material welding, and discloses a laser welding method for a high-reflecting material. The laser welding method comprises the following steps that laser texturing is carried out on the material to be welded through a laser so that a textured area with the surface provided with a tiny concave-convex structure can be formed in the material to be welded; laser welding is carried out on the textured area. According to the laser welding method for the high-reflecting material, due to the fact that the surface of the material on which laser texturing is carried out is uneven, the reflecting energy becomes small after laser radiation, two times of absorption or three times of absorption or more times of absorption become possible, the absorbing consistency in the material welding process is greatly improved, the keyhole effect can be more easily achieved by the material on which laser texturing is carried out in the welding process, and the welding effect is good.

Description

technical field [0001] The invention belongs to the technical field of high-reflection material welding, and in particular relates to a laser welding method for high-reflection materials. Background technique [0002] Highly reflective materials (lower laser absorption rate, such as copper) have always been a very difficult problem for laser welding. Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. In the 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process is heat conduction, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse and other parameters to melt the workpiece and form a spec...

AI Technical Summary

Problems solved by technology

Regardless of the connection method of the material, the key to laser welding is to form a "melt pool". To form a molten pool, there must be: "energy injection and absorption"; injection is improved step by step through the design of the laser and the external optical path. But if the absorption problem cannot be solved

Especially in the field of laser welding of highly reflective materials, it will cause problems such as increased thermal influence, damage to the laser itself due to high reflectivity, etc., and the welding effect is poor.

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