Variable polarity tungsten inert gas arc welding (VPTIG) is widely used in the welding of aluminum and aluminum alloys

due to its low cost and high weld quality. In order to enhance the arc energy density and its penetration ability

a novel ultrasonic double-pulsed deep penetration VPTIG (DP-VPTIG) process was proposed in this paper. Al-Cu and Al-Mg series aluminum alloy plates were employed as base materials. The preliminary experimental results show that the stable process and good welding quality can be obtained when DP-VPTIG is employed to weld aluminum alloy plates

and also the precise control of weld penetration can be achieved by adjusting the pulsed current characteristic parameters. It is very significant and valuable to carry out the applicability and related theoretical study for the novel DP-VPTIG process

which can be employed in the welding fabrication of aluminum alloy plates and show a good application prospect.