Performance inspection and defect cause analysis of girth weld of high steel grade pipeline

Abstract The suspected circumferential weld defects found in the pipeline inspection process were tested and studied. It was that there slag inclusion girth at 9 o’clock, which had not been early stage or laboratory nondestructive testing process. are most likely due to incomplete removal between layers low welding wire energy. There a root crack 6 o’clock position of weld, length 10 mm, close original film detection result excavation. misjudgment field rebeat test results may be caused by pits cover bottom weld. is crystal formed along middle columnar during solidification backing increase residual stress reduction group steel tube.