Spiral welded pipe: It is made by rolling low-carbon carbon structural steel or low alloy structural steel strips into pipe billets at a certain helix angle (called forming angle), and then welding the pipe seams. It can produce large-diameter steel pipes using narrower strip steel. The specifications are represented by outer diameter * wall thickness, and the welded pipe should ensure that the hydraulic test, tensile strength of the weld seam, and cold bending performance meet the regulations.

Industrial television internal inspection equipment: inspect the appearance quality of internal welding seams.

Magnetic particle flaw detector: used to detect near surface defects in large-diameter steel pipes.

Ultrasonic automatic continuous flaw detector: used to detect transverse and longitudinal defects in the full length weld of spiral steel pipes.

Ultrasonic manual flaw detector: for re inspection of defects in large diameter steel pipes, inspection of repair welds, and quality of welds after water pressure.

X-ray automatic flaw detection machine and industrial television imaging equipment: inspect the internal quality of the full length weld of spiral steel pipes, with a sensitivity of not less than 4%.

X-ray imaging equipment: Inspect the original and repaired welds with a sensitivity of no less than 2%.

2200 ton hydraulic press and microcomputer automatic recording system: inspect the pressure bearing quality of each large diameter steel pipe.