Longitudinal submerged arc welded (LSAW) tubes manufacture process is bending and welding wide steel plates to tubes from leveled hot rolled coils by both the JCOE and UOE (the forming process in which the plate like the letter “J”, “C”, “O” or “U” shape, then expansion) forming processes. Submerged Arc Welding, Types Of Saws, Steel Plate, Bending