A method for joining dissimilar materials by laser deep penetration-brazing

Abstract

The invention relates to a method for laser deep penetration-brazing connection of a dissimilar material. The method comprises the steps that a laser welding head, a high-pressure gas column nozzle and a protective gas spray pipe can move relative to a base material, when the backside temperature of the base material reaches or exceeds the gasification temperature value of the base material, the laser welding head and the high-pressure gas column nozzle are rotated, the laser welding head is made to incline relative to the upper surface of a workpiece, the high-pressure gas column nozzle is vertically aligned with the upper surface of the workpiece, a high-pressure gas column nozzle gas supply valve is controlled, and an inert gas column sprayed by the high-pressure gas column nozzle penetrates a small welding hole. According to the method for laser deep penetration-brazing connection of the dissimilar material, the high-pressure tiny gas column is used for assisting in maintaining the small hole, uniform distribution of laser energy in the depth direction of the small welding hole is optimized, it is avoided that the laser energy overflows and is lost, and groove-free laser deep penetration-brazing connection of the dissimilar material is achieved.

Description

technical field [0001] The invention provides a laser deep penetration-brazing method for connecting dissimilar materials, which belongs to the technical field of dissimilar material connection. It is especially suitable for the connection of dissimilar materials with large difference in melting point, such as the connection of steel and aluminum alloy, titanium alloy and aluminum alloy, etc., and high-performance connection joints can be obtained. Background technique [0002] With the promulgation of energy saving and emission reduction policies around the world, lightweight design concepts and low-carbon and environmentally friendly products are increasingly favored by consumers. At the same time, with the development of new materials and new processes, the composite structure of dissimilar materials has shown great application prospects in the fields of aerospace, automobiles, locomotives and other vehicles. However, in the face of such a great application prospect, the...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the solder spreads unevenly on the surface of one side of the high-melting point plate during the butt welding of dissimilar materials, resulting in poor mechanical properties of the joint

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