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27. Hver eru ferlarnir við framleiðslu á spíralsoðnum rörum?

Including raw material preparation, feeding and uncoiling, leveling, shear butt welding, edge cutting, delivery, pre-forming, internal welding, external welding, pipe cutting, preliminary inspection, slag cleaning, repair welding, chamfering, hydrostatic pressure test, X-ray inspection, ultrasonic inspection, finished product inspection, Kóðun, vörugeymsla.