There are some common defects of seamless pipe for sharing.
Abscission. ...
Straight within the fold. ...
Wall contraction. ...
Within the rolling scars. ...
Rolling fold. ...
Double seam fold.
Some examples of pipeline cracks and features that may appear crack-like in ILI data are given below.
Near Neutral pH SCC. Near Neutral pH Stress Corrosion Cracking. ...
High pH SCC. ...
FATIGUE CRACKS. ...
SOUR CRACKING. ...
LAMINATION. ...
HOOK CRACKS. ...
LACK OF FUSION. ...
ERW AND HFI SEAM-WELDED PIPE PLANAR FEATURES.
What are 5 welding defects?
Most defects encountered in welding are due to an improper welding procedure. Once the causes are determined, the operator can easily correct the problem. Defects usually encountered include incomplete penetration, incomplete fusion, undercutting, porosity, and longitudinal cracking.
What does underfill mean in welding?
UNDERFILL. Definition. The amount of weld that is below a straight line drawn from the edges of the joint preparation of a groove weld, with the exception of allowable undercut.