Iso-plus nails allow fastening of insulating materials such as air ducts to the metal sheet in a single operation. The welding machine provides high quality welds up to several centimeters thick. Because of the long cables and light weight, this machine is useful for construction sites. This machine uses the evacuation technique of the capacitors and allows the clips to be welded on the opposite side of the metal plate without overheating. Nails with ISO-plus flats consist of a steel pin tightly mounted on the galvanized steel washer. With the use of this insulated handle and capped nail ball, it is possible to fix the insulation with aluminum surface.