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Effects of electron beam welding parameters on the microstructure of titanium to aluminum alloy joints
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Electron beam welding of titanium alloy to aluminum alloy was carried out by melting and melt-brazing to investigate the effects of welding parameters on microstructure of the joint.The results indicated that the joint of the specimen welded by melting was well-formed but contained a large amount of intermetallic compounds.These intermetallic compounds were mainly composed of brittle phases such as TiAl and TiAl3 that decreased the ductility of the joints and resulted in a tensile strength 50 ％ lower than that of the base metal.In the melt-brazing experiment,direct heat was applied to the aluminum alloy to melt the aluminum rather than the titanium alloy,creating a well-formed joint.The weld was mainly composed of Al element and only a 3 μm thickness of intermetallic compounds formed near the fusion line at the Ti side.The ductility and the performance of the joint were significantly improved compared with those of the melting-only joint.In addition,the tensile strength of the joint reached 80 ％ of that of the aluminum base metal.
titanium alloyaluminum alloyelectron beam weldingmicrostructure of the joint
Chen Guoqing、Zhang Binggang、Ye Hongsen、Feng Jicai
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State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001
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