Microstructure and mechanical properties of weld joint of marine 6082 aluminum alloy By TIG welding

Marine 6082 aluminum alloy of 12 mm thick plate was welded by TIG welding with ER4043 and ER4047 as consumables,and the microstructure of the joints and the tensile strength of weld joints were studied. Results indicate that with the recommended welding parameters,the weld joints possessed high tensile strength with Al-Si welding wires,and the microstructure of the weld was as cast microstructure of dendrite, which was different with the cellular crystal of the fusion zone. The crystalline grain in the HAZ was slightly coarsened by the influence of the welding thermal cycles. The tensile strength and the tendency of forming large pores of the ER4043 weld joint was relatively lower than the ER4047 joint,but the ductility of joint welded with ER4043 was better.