What are the processes involved in the production of spiral welded pipes?

They include raw material preparation, loading and uncoiling, leveling, shearing and butt welding, trimming, conveying, pre-forming, inner welding, outer welding, pipe cutting and initial inspection, slag removal, repair welding, chamfering, hydrostatic pressure test, X-ray inspection, ultrasonic inspection, final product inspection, inkjet printing, and warehousing.