1. The minimum length of the repair weld is 50mm. If the defect direction on the base metal of the spiral steel pipe is allowed, the repair welding seam should be along the circumferential direction.
2. The repair welding seam 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.
3. The defects should be removed and cleaned before repair. The repair welding place should be completely arranged to make it meet the welding requirements.
4. The repaired steel pipe shall be subjected to a hydrostatic pressure test according to 5.5.1 of the SY/T5037 specification.
Post time: Oct-26-2022