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minimum amount of time before NDE
3

minimum amount of time before NDE

minimum amount of time before NDE

(OP)
Do any of the North American codes state the minimum amount of time that a weld should sit for before NDE is performed? I believe it is either 24 or 48 hours. Please reference the applicable code.

RE: minimum amount of time before NDE

As a practical matter, as soon as it cools to ambient temperature.

RE: minimum amount of time before NDE

From AWS D1.1: Acceptance criteria for ASTM A 514, A
517, and A 709 Grade 100 and 100W steels shall be
based on NDT performed not less than 48 hours after
completion of the welds.

RE: minimum amount of time before NDE

...and the reason for delayed NDT for these higher strength steels is because of delayed cracking from hydrogen absorbed during the welding process.

RE: minimum amount of time before NDE

(OP)
That's exactly what I was looking for GRoberts.

Thank you

RE: minimum amount of time before NDE

Downhand...that's only for specific high strength steels. If you are working with mild steel, it would not apply.

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