Twin-wire indirect arc gas shielded welding is a novelty welding technology, which work-piece is not linked to power source, arc is ignited and burns between the two wires, heat energy from arc column and droplets are used to melt work-piece. The advantages of this technology are large regulating range of heat input, minimum penetration ratio, high deposition rate, high usage of electric energy and low welding deformation and stress. It is a kind of welding method with high quality, high efficiency and ener...