Investigation on TIG welding of mixed gas for SiCp-reinforced aluminum matrix composite
Taking the He-Ar mixed gas as protected atmosphere, the weldability of TIG welding for SiCp/6061 Al composites were investigated without and with Al-Si filler. The tensile test of weld joint with filler was conducted. The microstructure and fracture morphology of the bead were observed. The results show that adding 50％ helium (vol. ％) in shielding gas improves arc stability and provides the seams with high quality appearance. Compared with the weld formability of composites with and without Al-Si filler having 12％ Si, the high quality appearance welded seam is obtained when the Al-Si filler added. In addition, the interface reaction between SiC and matrix is greatly depressed. The microstructure of the welding joint has evident non-uniformity and there are a lot of reinforcement phases in the weld center. The average tensile strength of weld joints with Al-Si filler is above 70％ of the matrix composites as annealed condition.
He-Ar mixed gas SiCp reinforcement Al matrix composite TIG welding
LIU Sheng-xin CHEN Yong WANG Xi-he NIU Ji-tai GUAN Shao-kang WANG Le-jun CHENG Dong-feng
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）