Laser welding method

Abstract

The invention provides a laser welding method which comprises the steps that to-be-welded first metal and to-be-welded second metal are arranged, so that the to-be-welded surface of the first metal and the to-be-welded surface of the second metal are oppositely arranged; the first metal and the second metal are irradiated with blue laser to enable the first metal and the second metal to form a liquid molten pool; two beams of infrared laser act on the liquid molten pool on the first metal and the liquid molten pool on the second metal correspondingly, so that a first welding keyhole is formed in the first metal, and a second welding keyhole is formed in the second metal; and the first welding key hole and the second welding key hole are expanded and fused. According to the laser welding method, the blue laser and two red laser beams are adopted for welding, so that the overall laser utilization rate is high, laser welding can be completed with low total power, the cold joint problem is not likely to occur, no splashing is generated in welding, the overcurrent capacity of a weld joint is guaranteed, and efficient and splashing-free welding of the first metal and the second metal is completed.

Description

【Technical field】 [0001] The invention relates to the field of laser welding, in particular to a laser welding method for copper materials and dissimilar materials containing copper materials. 【Background technique】 [0002] In recent years, as a method of reducing spatter, pores, etc. during laser welding, it has become an important research direction. Conventional near-infrared dual-core fiber lasers are more and more widely used. Dual-core fiber lasers contain high-brightness central beams And low-brightness ring beam, the center beam can quickly create a keyhole, and the ring beam can heat the area around the keyhole, so it is possible to perform hybrid welding of keyhole welding and heat conduction welding at the same time. This hybrid welding process, the area around the keyhole is also heated, so the surface tension of the keyhole opening increases, it can spread out like a bell mouth, and the metal vapor can be discharged smoothly, so it can greatly reduce spatter, e...

AI Technical Summary

Problems solved by technology

[0003] However, the reflectivity of copper to near-infrared light is as high as 95%. Therefore, the heating area around the keyhole of a dual-core fiber laser based on near-infrared light is almost completely reflected by the surface of copper due to the low power density, resulting in Insufficient heating does not achieve the purpose of reducing splash and air holes well

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