The invention discloses a welding gun device for welding metal. The welding gun device comprises a connecting thread, small holes, a core bar, a center hole and thin grooves. The welding gun device for welding metal is characterized in that an outer sleeve passes through the connecting thread on an inner core; the inner core is provided with the five small holes, and the core bar is provided with the eight thin grooves; and a welding nozzle is connected with a welding gun used for connecting propane gas and oxygen. The welding gun device is reliable in working performance and low in failure rate, the problem of welding quality is solved, and as for nonferrous metal, the welding quality of oxygen-acetylene gas is surpassed.