Effects of Ni on microstructure and properties of aluminum- stainless steel TIG welding-brazing joint with AI-Si filler  

作　　者：何欢 林三宝 杨春利 范成磊 陈哲 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining, HarbinInstitute of Technology, Harbin, 150001.

出　　处：《China Welding》2012年第4期1-7,共7页中国焊接（英文版）

基　　金：Acknowledgement The authors would like to appreciate the financial support from the National Natural Science Foundation of China （Grant No. 50874033）.

摘　　要：Effects of Ni on microstructure and properties of aluminum-stainless steel TIG welding-brazing joint with Al-Si filler were studied. Different mass percentage of Ni powder was added in the flux separately. Results of tensile tests show that a significant improvement on mechanical properties of the butt joint is obtained using the modified flux. Moreover, obvious differences on microstructures of the interfaces were observed with Ni addition, that two intermetallic compound （IMC） layers at the interface change to one layer and the IMC thickness also decreases. Finally, effect mechanism of Ni was analyzed and discussed. Ni addition leads to an enrichment of element Si at the brazing interface, and furthermore suppresses the formation of intermetaUic compound. The reduction of IMC thickness is the main reason for the improvement of joint properties.Effects of Ni on microstructure and properties of aluminum-stainless steel TIG welding-brazing joint with Al-Si filler were studied. Different mass percentage of Ni powder was added in the flux separately. Results of tensile tests show that a significant improvement on mechanical properties of the butt joint is obtained using the modified flux. Moreover, obvious differences on microstructures of the interfaces were observed with Ni addition, that two intermetallic compound （IMC） layers at the interface change to one layer and the IMC thickness also decreases. Finally, effect mechanism of Ni was analyzed and discussed. Ni addition leads to an enrichment of element Si at the brazing interface, and furthermore suppresses the formation of intermetaUic compound. The reduction of IMC thickness is the main reason for the improvement of joint properties.

关 键 词：aluminum alloy stainless steel WELDING-BRAZING Nocolok NI INTERMETALLIC 

分 类 号：TG161.8[金属学及工艺—热处理] TG454[金属学及工艺—金属学]