The Key Technology and Future Tendency of Laser Welding of Steel-Aluminum

Two different types of materials like steel and aluminum,cast iron and aluminum,magnesium and aluminum are joined each other to meet the requirement of multi-materials vehicle body.Compared with other welding means,laser welding is more suitable to weld steel to aluminum due to its characteristic of concentrated power,accuracy of controling heat source,low strain and stress.Based on analyzing the difficulties of welding steel and aluminum,some common current defect,forms of joint,surface treating and filler of welding steel and aluminum are summarized and the influence of laser welding parameters is emphasized.As a developing trend,to design and develop a flexible jacket,to reinforce the optimization of laser welding parameters,to control welding defects,to select proper filler,to do research on the mechanism of integrating Fe-Al interface and the condition of forming brittle and ductile intermetallic FeAl compound are also pointed out in order to provide reference for welding multi-materials vehicle body.