DSAW, ERW, SSAW, LSAW, EFW Steel Pipe

Welded pipe can be pided into ERW, SSAW, LSAW, EFW: ERW: Electric resistance welding pipe   EFW: Electric fusion welding pipe   SSAW: Spiral submerged arc welding pipe  LSAW: Longitudinal submerged arc welding pipe Among them, SSAW and LSAW are both called DSAW: Double side submerged arc welding pipe