... steel, alloy steel structure of the comprehensive set welding 1.2 mm wire are widely used in steel structure, ... inverter arc welding machine, dc inverter arc welding machine, dc argon arc welding machine, dc inverter and argon arc combination machine, mig gas shielded welding, ac arc ... steel, alloy steel structure of the comprehensive set welding 1.2 mm wire are widely used in steel structure, ...