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Effects of Ni on microstructure and properties of aluminum- stainless steel TIG welding-brazing joint with AI-Si filler 被引量:3

Effects of Ni on microstructure and properties of aluminum- stainless steel TIG welding-brazing joint with AI-Si filler
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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.
出处 《China Welding》 EI CAS 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).
关键词 aluminum alloy stainless steel WELDING-BRAZING Nocolok NI INTERMETALLIC aluminum alloy, stainless steel, welding-brazing, Nocolok, Ni, intermetallic
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