Mechanical Properties and Microstructure of Dissimilar Laser-induction Heating Hybrid Braze-welding of Al Alloy to Steel
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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