Method for laser powder-filled welding of aluminum/steel dissimilar metal joint without brazing flux

Abstract

The invention discloses a method for laser powder-filled welding of an aluminum/steel dissimilar metal joint without a brazing flux, belonging to the technical field of high-power laser processing. The method comprises the following steps of: utilizing a laser powder-filled welding method and a synchronous powder feeding technique; enabling a joint arrangement form as follows: arranging an aluminum plate above a galvanized steel sheet and laying a layer of brazing material between two layers of plates; regulating the size of a laser spot and the size of a powder beam to be matched, and regulating the mutual position relationship of the powder beam and the laser spot so that a front half part is arranged in a back half part of the laser spot; and welding by optimal powder-filled welding process parameters so that an aluminum alloy and one side of the brazing material are molted and infiltrated with the galvanized steel sheet to form brazing connection on the premise of ensuring the galvanized steel sheet not to be melt. According to the method for the laser powder-filled welding of the aluminum/steel dissimilar metal joint without the brazing flux, disclosed by the invention, the brazing flux does not need to be used; added metal powders during welding can effectively increase the absorptivity of a workpiece on laser and the utilization rate of the laser; and in addition, the added powders can further effectively restrain heat cracks of the aluminum alloy during welding and improve the quality of the joint.

Description

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AI Technical Summary

Benefits of technology

This technology allows for better control over how well different materials (aluminum alloys) join together when they're being joined through lasers without requiring any solvent or other chemical agents that could harm them. It also improves upon existing methods used at high speeds due to its ability to change the shape of the molten material before it reaches the joining area. Overall, these improvements make possible faster production processes with improved efficiency while maintaining good quality connections between metals made from similar types of plates.

Problems solved by technology

This patented technical issue addressed in this patents relating to improving the joining between different types of material (lightweight iron) made from similar metals like magnesium and zinc that makes vehicles stronger without adding heavy weights compared to traditional structures. Current solutions involve fusion wires or roll bondings, while new techniques involving ultrasonics offer better results than previous ones.

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