... cams, sprockets, gears, valves, ball pin and large machine tools and other hardening guides and ductile iron, many domestic manufacturers ... Grinding, drilling, cutting welding. Other hybrid welding of metallic materials. Such as brass, copper parts, valves, stainless steel ... moves components, Auto car-components, Motorcar-components, etc. machine metals parts, the Quenching for surface, of inside bore ...