With the development of lightweight launch vehicle structure,part of the traditional steel structure has been gradually replaced by aluminum alloy and other lightweight materials,which involves Al/Steel dissimilar joint technology.To obtain high-quality Al/Steel dissimilar joints,the self-developed laser-inductive heating composite welding platform was used to carry out the Al/steel laser braze-welding process experiment.With the help of a scanning electron microscope(SEM),energy spectrum analyzer(EDS),and other analytical means,the macroscopic morphology,microstructure,and mechanical properties of the aluminum/steel joints were comparatively studied with and without induction heating.The results show that induction heating can improve the wetting and spreading of Zn-Al brazing material on the surface of stainless steel which improved the brazing width and promote the growth of intermetallic compounds at the interface in the process of laser brazing welding;moreover,induction heating improves the mechanical properties of the joint,which are increased from 189.8 N/mm to 267.2 N/mm,and the form of fracture of the joint is changed from the brittle fracture near the interface to the ductile fracture near the fusion line.
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