Checklist : Weld Inspection

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It is critical to ensure high quality welds in a piping system to avoid leakages of dangerous chemicals during operation as well as protect against explosions. Weld quality must be ensured as per international codes applicable to current project. Weld inspection is a critical activity to ensure quality of a weld. Here is a typical list for weld inspection for a piping system.

SrCheck ItemDone
1There are no Longitudinal or Transverse cracks in weld.
2There are no Crater Cracks in weld.
3No uncosumed weld wire sticking out of weld metal.
4There is no failure of the weld metal to fuse completely at some portion of the weld zone or adjacent base metal. This includes incomplete fusion of consumable inserts
5There is no incomplete joint penetration i.e. a joint root condition in a groove weld in which weld metal does not extend through the joint thickness.
6There is no Irregular bead profile i.e. Underfill, valleys, sharp notches at root face, undercuts and surface ripples.
7There is no Overlap (Roll Over/Cold Roll) i.e. The protrusion of weld metal beyond the weld toe or weld root.
8There is no A discontinuity consisting of slag entrapped in weld metal or at the weld interface
9There are no Gas bubbles frozen in the solidified weld metal.
10There is no undercut i.e. a groove melted into the base metal adjacent to the weld toe or weld root and left unfilled by weld metals.
11There is no underfill condition in which the weld face or root surface of a groove weld extends below the adjacent surface of the base metal.
12There is no splatter i.e. globular drops of weld metal that are deposited on the weld or base material during welding, which do not form part of the weld.
13There is no excessive weld reinforcement which is a weld metal in excess of the quantity required to fill a joint in groove welds.
14Fillet weld leg is not undersized i.e. Weld leg is not the correct height or width , not in complaince with drawing, or weld legs are unequal.
15Check if convex fillet weld does not have overfill or excessive weld appearance.
16Check if fillet welds are not too concave i.e. they have sunken in or have underfill appearance.