Joining vacuum high pressure die cast aluminum alloy a356 subjected to heat treatment to wrought alloy 6061.

摘要

The objective of the present work was to investigate the feasibility of joining high pressure die cast aluminum alloy A356 for automotive applications. Joining of vacuum high pressure die cast aluminum alloy A356 subjected to different heat treatments with wrought 6061 was carried out by using the Gas Metal Arc Welding (GMAW) process. The results of tensile testing showed that the order of the welded samples with the overall engineering performance combining the strengths and ductility from the highest to the lowest were T5-A356 alloy, as-cast A356 alloy, T6-A356 alloy and T4-A356 alloy. The SEM microstructure analysis indicated the high level of porosity present in heat treated alloys should be responsible for the failure of the filler alloy. The fractographic analyses revealed that the 6061 samples exhibited the highest ductility among the tested alloys, which were consistent with the results of tensile testing.