TIG Welding Heat Efficiency for AZ31B Magnesium Alloy
CHU Ya-jie1,2, CHEN Jian1, LI Xiao-quan2, WU Shen-qing1, YANG Zong-hui2
1. School of Materials Science and Engineering,Southeast University, Nanjing 211189,China; 2. School of Materials Engineering, Nanjing Institute of Technology,Nanjing 211167,China
Abstract：The AZ31B magnesium alloy welded joint were carried out on tungsten inert gas(TIG) welding with filler, and arc heat efficiency and melting efficiency were studied in terms of process parameters (welding current in the range of 120-200A, welding voltage in the range of 11-15V and welding speed in the range of 3-11mm/s), and the effects of welding process parameters, arc heat efficiency and melting efficiency on the microstructure of welding joint were analyzed. The results showed that the arc efficiency values ranged from 0.56-0.82 in terms of welding process parameters. Melting efficiency increased with both increasing welding current and speed. The analyses revealed a strong influence of the TIG welding process on cross-section shape of the fusion zone (the depth B and width H) and also on the microstructure of the welding zone.
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2012, Vol. 0 
