Double-sided coaxial GTA flat-overhead welding of 5083 aluminum alloy

Aluminum alloy joint without angular deformation and imperfections was obtained by dual-power double-sided coaxial gas tungsten arc flat-overhead welding process. Irrespective of the heat input distribution on both sides of the plate, the molten pool was frequently depressed as the upward maintenance force could not generally sustain the downward destructive force, and finally achieved equilibrium with the assistance of additional force generated in curved liquid surface. There was no burning loss of the alloying elements, which were distributed homogeneously without any segregation. The tensile strength of the weld reached (similar to)90% of that of the base metal, and the softening extent of the joint was unnoticeable.