Method of laser-welding metal materials by double lasers

Abstract

A method of laser-welding metal materials by double lasers includes the steps: 1, cleaning welding material and fixing the welding material; 2, generating two laser beams by two lasers and allowing the two laser beams to focus on the surface of the welding material; 3, laterally blowing protective gas to the surface of the welding material; 4, generating the first laser beam by the quasi-continuous laser, and melting the surface of the welding material into a bath; 5, focusing the second laser beam to the area of melted welding material; 6, allowing the laser beams to synchronously move at a given scanning speed to form a weld seam on the surface of the welding material, and finishing welding. The method has the advantages that surface microstructure of aluminum alloy can be changed, the surface of the aluminum alloy is melt into the bath to increase the rate of the aluminum alloy absorbing continuous wave laser beams, and welding quality is improved.

Description

technical field [0001] The invention belongs to the technical field of laser processing, in particular to a method for implementing laser welding on metal materials by using dual lasers. Background technique [0002] Metal materials, especially aluminum alloys, are widely used in modern industry, and the demand for welding aluminum alloys is increasing. Compared with the traditional welding method, the laser welding method has the advantages of energy concentration, small thermal deformation, and good controllability. Due to its high reflectivity and high thermal conductivity, aluminum alloy laser welding makes it difficult to weld aluminum alloy with a single laser heat source, and usually requires a power density greater than 5×10 6 W / cm 2 . At present, some people propose to use laser-MIG hybrid welding technology to weld aluminum alloy (ZL201010280596.7), and the process is relatively complicated. Literature (Research on the welding characteristics of aluminum alloy ...

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Problems solved by technology

At present, some people propose to use laser-MIG hybrid welding technology to weld aluminum alloy (ZL201010280596.7), the process is relatively complicated

Literature (Research on the welding characteristics of aluminum alloy double beams, China Laser, 2007, 35 (11): 1783-1788) discloses a method of using split beams, the laser beam is divided into two beams of laser beams through a beam splitter, and the aluminum alloy Welding is carried out, and the quality of the weld seam has improved, but the energy ratio of the two laser beams obtained through the beam splitter cannot be adjusted, and the general line difference

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