Treatment for transverse cracks of LSAW steel pipe

Treatment for transverse cracks of LSAW steel pipe

Once confirmed as the transverse crack, the LSAW steel pipe must be sent for rework processing. Transverse crack before repair should be determined the depth and width of gouging and grinding. In order to ensure a thorough rework, the confirmed depth of the ultrasonic testing should be added a few millimeters for margin. Also after gouging and grinding and before re-welding repair, the pipe must be carried out a magnetic particle testing. What should be noted is that the side wall of the groove also belong to the detection range, in order to ensure complete removal of the defect, and then welded by welding personnel, otherwise it would be difficult to ensure the complete eradication of the crack. The low hydrogen welding wire (strip) should be used when repairing, must be preheated before repair, cleaning up after gouging, grinding carbon to the exposed metallic luster, take the necessary protective measures after slow cooling repair, such as the use of asbestos-coated after welding welding sew for slow cooling. In addition, the re-examination of transverse crack repair, must be strictly enforced at 24h or 48h after welding and then check.