Double-laser beam compound welding device and use method thereof

Abstract

The invention relates to a double-laser beam compound welding device and a use method. The device comprises a YAG (Yttrium Aluminum Garnet) laser emitter, a green laser emitter and an achromatism welding joint, wherein the achromatism welding joint is capable of inputting double-flexible optical fiber and coaxially outputting double-light beam; a welding joint light path comprises a YAG laser anti-reflection collimating lens, a green laser anti-reflection collimating lens, a YAG laser total-reflection lens, a green laser total-reflection and YAG laser anti-reflection lens and a green laser and YAG laser anti-reflection focus lens; and a divergence angle of a YAG laser beam between the YAG laser anti-reflection collimating lens and the green laser and YAG laser anti-reflection focus lens is changed by changing a distance between an optical fiber head of a YAG laser transmission optical fiber and a front focus of the YAG laser anti-reflection collimating lens, so as to change the focusing faculae position of the YAG laser and realize the superposition of the focusing faculae of the YAG laser beam and the green laser beam at the welding joint of a to-be-welded workpiece. According to the double-laser beam compound welding device, the green laser beam is adopted for preheating the to-be-welded workpiece, and then the YAG laser beam is adopted for welding, so that the welding problem caused by the high reflection coefficient of the surface of copper is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to a double laser beam composite welding device and its application method, which is mainly used for the connection of copper and its alloys with high surface reflection coefficient, especially for spot welding or splicing of copper and its alloys. weld. Background technique [0002] Laser welding has the advantages of high precision, high processing rate, narrow heat-affected zone, and more convenient realization of flexible processing and automation, so it is increasingly widely used. Current laser welding systems typically use a 10.6μm beam produced by a carbon dioxide laser, or a 1.064μm beam produced by a Nd:YAG laser, but beams of these wavelengths are significantly reflected by copper and its alloys at room temperature. Due to the existence of high surface reflectivity, the welding process requires extremely high peak energy to overcome the initial resistan...

AI Technical Summary

Problems solved by technology

However, once a portion of the laser energy is coupled to the metal and causes an increase in temperature, the reflectivity decreases

Absorption increases dramatically when the metal reaches its melting point, and the high power initially required, at this point far exceeds that required for welding, causing material to spatter or cause unnecessary evaporation, leaving larger holes in the workpiece or holes, affecting the welding quality, so it is necessary to improve

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