The repair requirements for the shortcomings of
spiral steel pipe welds are as follows:
The minimum length of the repair weld is 50mm. If the defect direction on the base metal of the steel pipe is allowed, the repair welding seam should be along the circumferential direction.
Repair welds should be ground to make the transition to the original appearance of the steel pipe steeper. The height of the base metal after repair welding and grinding shall not exceed 1.5mm.
Defects should be removed and cleaned before repairing. The repair welding place should be completely arranged to make it meet the welding requirements.
The repaired steel pipe shall be subjected to the hydrostatic pressure test by 5.5.1 of the SY/T5037 specification.
