suitable timing for post weld NDE

[mariolucas75]

Where is a reference / guidance for suitable timing for post weld nde - depending on various factors: thickness, low/high Hydrogen electrode, preheat / interpass temperatures etc etc ?

 

[ShabsRBI]

As far I know API-510 ( Pressure vessel Inspection code) in its para 8.3.4 Repairs to Stainless Steel Weld Overlay and Cladding refer the following point.

For vessels constructed with P-3, P-4, or P-5 base materials, the base metal in the area of repair should
also be examined for cracking by the UT in accordance with ASME Code, Section V, Article 4, Paragraph T-473.
This inspection is most appropriately accomplished following a delay of at least 24 hours after completed repairs
for alloys that could be affected by delayed cracking.