Research on the Process in MIG Welding of 5A02 Aluminum Alloy Plate

10mm thick aluminum alloys 5A02 plates were welded using MIG beam in this paper.The MIG weld formation and microstructure morphology were studied,the hardness in the weld were measured, the tensile test were made.The test result shows that the cooperation of welding current,speed and root gap can lead to perfect welds.There are equiaxed grain in the central welds and cloumnar grain structure near the fusion line.The maximum hardness is in the fusion zone of joints,and the minimum is in the softening zone.