... ,000 ton welded pipe production lineProduction line introduction:Large-Diameter Longitudinal Submerged-Arc Welded (LSAW) Pipe Production ... weldingG,outside weldingH,ultrasonic detectionI,X-ray testingJ,diameter expandingK,water pressure testingL,ultrasonic detectionM,X-ray ... , expanding machine, hydrotester, chamfering machine, etc. Large-Diameter Longitudinal Submerged arc welded pipe production line