As per the requirements of ASME B31.3 Addenda-2001, Table341.3.2-
Category D & Normal Fluid Service where fillet welds include socket and seal welds, and attachment welds for slip-on flanges, branch reinforcement, and supports:
Depth of undercut- ¡Â 1 mm (1/32in.) and ¡Â ¨ù of the wall thickness
Severe Cyclic Service:
Depth of undercut- Zero (no evident imperfections)
For B31.1 Power piping, review Chapter VI, "Inspection, Examination and Testing"....... See Section 136.4.2 "Visual Examination of Welds"
In this Section, undercut that is deeper than 1/32" is cause to reject.
Addtionally, vertified inspection people must perform the examination.
