Method and equipment for precise micro-welding of nonferrous metals through composite dual wavelengths

Abstract

The invention discloses a method and equipment for precise micro-welding of nonferrous metals through composite dual wavelengths. After being collimated, a first laser beam produced by a first laser device is collimated with a second laser beam which is formed by outputting a laser beam produced by a second laser device through a second laser galvanometer, then combined laser is output through a first laser galvanometer, and the combined laser acts on a welded body through focusing; and a focused second laser spot moves in a first laser spot. According to the method, in a welding process, a high-power long-wavelength focused laser spot is fused into a low-power short-wavelength focused laser spot, and moves in the low-power focused laser spot, so that when a welding point of the welded body absorbs low-power laser energy, high-power laser energy is absorbed by the absorption power of the welding point, therefore, the size of the welding point is determined through the high-power laser spot, so that the size of the welding point is further reduced to the maximum extent, the size of the welding point can be made to be very small, and the requirement for the precise micro-welding of difficult-to-weld metal and anisotropic metal is met.

Description

technical field [0001] The invention belongs to the laser welding technology, and in particular relates to a welding technology using dual-wavelength lasers. Background technique [0002] For metal fusion welding, domestic and foreign countries are at the same level, and the size of solder joints is above 300 microns. In terms of metal precision fusion welding, the mainstream laser welding equipment for conventional ferrous metals is the QCW fiber laser in the infrared band, and its safe weldable minimum thickness is about 0.15mm. In terms of non-ferrous metal sheets, due to the jump of the melting phase transition of the absorption coefficient, infrared laser welding often leads to welding quality problems such as splashes, jets, and voids. [0003] Infrared dual-laser welding technology has been used in ferrous metal welding, which can eliminate defects such as incomplete fusion and pores while ensuring welding penetration. For example, CN106862757A discloses a dual-laser...

AI Technical Summary

Problems solved by technology

Because the device combines the two laser beams with simple focus, the size of the two laser spots cannot be adjusted, so the size of the welding spot depends on the size of the green laser, resulting in a large welding spot; it cannot be used for precision micro-welding, and also Welding with small solder joints and large penetration depth cannot be realized

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