Abstract
This study aims to investigate Nd:YAG laser welding of dissimilar Mg/Al joints using Cu interlayer. Welding processing, microstructure and the corrosion properties of laser-welded Mg/Al joints with Cu interlayer were discussed. According to the results, the pulse width is the most important influence on weld formation of dissimilar Mg/Al joints, followed by laser power and welding speed. Selected optimization process parameters of 1 mm AZ31B/6061 lap welding are: laser power is 6 KW, laser pulse width is 7.5 ms, velocity is 1.2 mm s−1. There is no obvious pore and cracks in the Mg/Al joint with Cu interlayer. The Mg-Al-Cu compounds are introduced to the Mg-Al binary system and then the microstructure of the fusion zone is optimized and improved. The IMCs are mainly consisted of Mg17Al12, Al3Mg2 and Al6CuMg4. The plastic of (Al6Cu)Mg4 is better than that of Mg17Al12, Al3Mg2 according to the calculation. Model of mechanism of interfacial reaction layer is established. Because of the existence of Cu, the reaction of Mg, Al was depressed and the generation of MgAl compounds was decreased. The corrosion resistance of alloys in different conditions decreased in the following order: 6061 Al> the weld beam >AZ31B Mg.
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