铝合金DPMIG与TPMIG焊接头组织和性能的对比

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

采用DPMIG焊和TPMIG焊焊接工艺,对比研究了不同参数对AA6061铝合金焊接性能的影响.运用小波分析仪检验焊接过程的稳定性.利用光学显微镜和电子拉伸试验机,研究了DPMIG焊和TPMIG焊焊接接头的显微组织和拉伸性能.结果表明,TPMIG焊和DPMIG焊焊接过程稳定,电流电压波形周期性变化,重复性好.TPMIG焊的动态电阻和输入能量的高低变化更为有序,得到了比DPMIG焊更为美观的鱼鳞纹焊缝.不同焊接速度下,与DPMIG焊相比,TPMIG焊熔合区的气孔和裂纹等缺陷均较少,拉伸强度均有所增加,说明TPMIG焊是一种较DPMIG焊更为优良的焊接方法.

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.