标题：Influence of Welding Heat Input on Microstructure of Ti/Al Joint During Pulsed Gas Metal Arc Welding
作者：Wei, Shouzheng; Li, Yajiang; Wang, Juan; Liu, Kun
作者机构：[Wei, Shouzheng; Li, Yajiang; Wang, Juan; Liu, Kun] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R 更多
通讯作者地址：[Li, YJ]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China.
来源：MATERIALS AND MANUFACTURING PROCESSES
关键词：Al 1060; Microstructure; Pulsed gas metal arc welding; Ti-2Al-Mn;; Welding heat input
摘要：Pulsed gas metal arc welding of titanium alloy Ti-2Al-Mn to aluminum 1060 using AlSi5 filler metal was conducted. Microstructures of Ti/Al joints with different welding heat input were investigated. Chemical composition and phase constituent near Ti/Al interface were analyzed. Microhardness distribution of the weld zone was tested. Binary intermetallic TiAl3 precipitations were formed in the weld metal, and it was concluded that morphology of TiAl3 precipitation varies with variation of welding heat input. Welding heat input also has a great influence on microstructure of Ti/Al interface. With a low welding heat input, the intermetallics TiAl3 were formed as a serrate reaction layer near the Ti/Al interface. With a higher welding heat input, multilayered interfacial reaction layers that consist of TiAl3, Ti7Al5Si12, and -Ti layers were formed near the Ti/Al interface. Joints without defects were obtained when welding heat input was 1.85-2.10kJ/cm.