... steel, galvanized iron and other metal materials, also used in welding copper alloy, gold, silv DNY-10, DNY-16, DNY-25 ... : Supply two kinds of cooling model spot welder: self-cooled and air cooled.Widely used in welding carbon steel, stainless steel, galvanized ... iron and other metal materials, also used in welding copper alloy, gold, silver, ferrous metals, non-ferrous metals and ...