Using air plasma cutting machine will cut a single tube. After spiral into a single pipe, each batch of steel should be carried out strict inspection system, inspection of weld mechanical properties, chemical composition, fusion status, spiral surface quality and after NDT inspection to ensure that qualified pipe technology before they can formally put into production. Continuous acoustic testing marks the site of the weld, after manual ultrasonic and X-ray review, spiral if there are defects, after repair, again through non-destructive testing, until confirmed defect has been eliminated. 

After each pipe hydrostatic test pressure radial seal. Test pressure pipe pressure and time by computer testing device strictly controlled. Test parameters are automatically printed record. Pipe end machining, so that the end vertical, blunt edge bevel and accurate control. Spiral weld length of 30 to 100%, and lower production rate spiral. Therefore, most of the smaller diameter pipe straight seam welded, large diameter spiral welded pipe for the most. Steel butt weld pipe and where the spiral weld intersects with D-type connector, and all through the X-ray television or film examination.