... ~1,100,000 ton welded pipe production lineProduction line introduction:Large-Diameter Longitudinal Submerged-Arc Welded (LSAW) Pipe Production Line apply ... testing equipment, edge-trimming machine, forming machine, welding equipment, straightening machine, X-ray testing equipment, expanding machine, hydrotester, chamfering machine, etc. Large-Diameter Longitudinal Submerged arc ...