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Micro-zone performance of laser-MIG hybrid welded A7N01P-T4Al alloy joints
Pages: 114-118+134
Year: Issue:  8
Journal: Transactions of the China Welding Institution

Keyword:  laser-MIG hybrid weldA7N01 Al alloymicro-zone tensilefracture toughness;
Abstract: Laser-MIG hybrid welded joint of 14 mm A7N01P-T4 Al alloy for high speed train was investigated,the properties of WM( weldmetal),HAZ( heat affect zone) of joints and BM( base metal) were tested respectively,such as microzone tensile property,fracture toughness and so on,and the differences of micro-zone properties were analyzed by OM and SEM. BM has the best micro-zone tensile strength,while that of WM is the lowest. HAZ has the highest fracture toughness Jm( 14),which can reach up to 119. 580 kJ /mm2 and indicatesan outstanding ability to resist crack growth in hybrid welded joints.Shapiro-Wilk normality test showed that fracture toughness of laser-MIG hybrid welded A7N01P-T4 Al alloy joints is extremely reliable.
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