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PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Microstructures and Properties of Pulsed Mig Joint of A6n01 Al Alloy
J. Ye1, P. Li1, S. Yang2, X. Deng1 and B. Gao1
1CSR Qingdao Sifang Co., Ltd. Qingdao, PR China
J. Ye, P. Li, S. Yang, X. Deng, B. Gao, "Microstructures and Properties of Pulsed Mig Joint of A6n01 Al Alloy", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 120, 2014. doi:10.4203/ccp.104.120
Keywords: high-speed vehicle, hollow sectional material, Al alloy, pulsed MIG welding, microstructure, mechanical property.
The A6N01 Al alloy was welded using pulsed MIG welding (P-MIG) in a test and the microstructure and mechanical properties of the joints were investigated. The results of the experimentation show that the microstructure of the welding metal is as-cast microstructure, and the microstructure of the base metal is isometric crystal. There is a narrow fusion zone near the edge of the weld seam, which consists of fine columnar grains. The micro-hardness at the centre of the welded metal is lowest in the joint. The tensile strength of the welded joint is 198MPa and the percentage elongation after fracture is 7%. The zone of fracture is located in the welding metal.
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