Comparison of the properties of aluminum alloy welding joint between DPMIG and TPMIG

With the DPMIG and TPMIG welding methods, the effect of different parameters on the welding performance of AA6061 aluminum alloy is studied in this paper. The stability of the welding process is verified with a wavelet analyzer, the microscopic structure and tensile property of the welding joint of the DPMIG and TPMIG methods is studied using a optical microscope and a electrical tensile test machine. The test results show that the welding processes of the TPMIG and DPMIG methods are both stable, and the voltage and current waves are both periodic and repeatable. But the variations of the dynamic resistance and intake energy of the TPMIG method are more ordered. The ripple weld seam of the TPMIG method is better than that of the DPMIG method, as well as less defect such as stoma and crack and better tensile property under different welding speed, showing that the TPMIG is a better welding method than the DPMIG method.