5A06 aluminum alloy sheet welding with traditional TIG and MIG welding technology is usually inefficient and results in poor mechanical performance as well as cannot meet requirements. For this critical problem

the DC double pulse MIG welding experiments of 5A06 aluminum alloy sheets were carried out. The effects of DC double pulse MIG welding technology on the microstructure and mechanical properties of the welded joints were investigated by optical microscopy

scanning electron microscopy and tensile testing machine. The results show that when the wire feed speed is 5 m/min

welding speed is 50 cm/min

pulse frequency is 3 Hz

wire extension is 12 mm

and protective gas is high purity Ar gas with a flow rate of 25 L/min

the beautiful weld surface with fish scale figure are obtained

there is a large amount of the fine equiaxed grain in weld zone and the gas pores in the weld cross section reduce.The welded joint has good tensile property

and tensile strength of the welded joint is above 90% of the base metal.