Nihonweld N-AL4 description: N – Al 4 is a manual metal arc electrode for the fabrication and repair of aluminum alloys both wrought and cast form including pipe, plate, forgings and castings which use silicon additions of up to 7% as the main alloying element. Other alloys can be welded except those were magnesium, copper or zinc are the major additions. The special flux coating provides good arc stability and slag fluidity and ensures the removal of surface oxides during the welding operation. The electrode is suitable for use with DC+ only.