Microstructure and mechanical properties of laser welding and laser-argon arc welding of 3A21 aluminum alloy

In this experiment,the effect of different bonding technology on welding point microstructure,flaw distribution and hardness distribution of 2 mm 3A21 aluminum alloy which were welded by laser welding and laser-argon arc welding was studied.The results showed that laser-argon arc welding microstructure was better than laser welding microstructure,and the air hole volume of laser-argon arc welding was obviously reduced.The micro-hardness of laser welding point was higher than laser-argon arc welding point,and the values were 52 HV and 51.3 HV respectively,they were all higher than the micro-hardness of matrix hardness which was 43 HV.