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Up Topic American Welding Society Services / Technical Standards & Publications / Time for NDT
- - By stkn2l Date 09-17-2018 13:21
Hello all,

If I have to weld S460G2+M with S355G8+M PJP, according to AWS D1.1 6.11 Nondestructive Testing (NDT) - "the testing may begin immediately after the completed weld have cooled to ambient temperature".

So I don't have to wait 24 or 48 hours, am I correct ?
Parent - By 803056 (*****) Date 09-17-2018 20:10
I am not familiar with the particular steels you listed because they are not prequalified per AWS D1.1. However, it is the high strength quench and tempered steels that should not be examined right away since they are more susceptible to delayed cold cracking due to hydrogen.

Al
Parent - - By Lawrence (*****) Date 09-17-2018 20:21
Since the base metals you note here appear to be "unlisted" in D1.1,  I think the decision on when to perform the NDT should be determined by the Engineer.

Also since the base metals require Procedure Qualification, this is something the engineer should determine prior to performing the procedure qualifying weld tests.

The S460G2 sometimes requires PWHT so that's something to think about.

D1.1 Table 6.1  (5)  Time of inspection does list some circumstances that require a hold point of 48 hours.   If your unlisted material is similar to those base metals, your engineer should be able to evaluate and direct you.
Parent - - By stkn2l Date 09-18-2018 06:09
They are not quenched and tempered but termomechanical rolled steel
Parent - - By Tyrone (***) Date 09-18-2018 11:18
This steel has extremely fine grain microstructure formed by rolling and rapid cooling.  This high strength steel is probably highly sensitive to hydrogen (my opinion).  Yes, I would wait before NDE.  Have you checked the steel supplier's data sheets?

Tyrone
Parent - - By stkn2l Date 09-20-2018 05:58
Yes I checked. Of course we will use low hydrogen process but can I use explanation which is in AWS d1.1 to set the time for NDE ?
Parent - By Tyrone (***) Date 09-20-2018 11:42
Different industries and governing bodies have different wait times.  What's the risk if the weldment fails?  Weigh the severity of missing hydrogen cracks vs Production.

AWS D1.1 – A514: 48 hrs
DNV-OS-C401 (Norway Ship Building) - NV36: 48 hrs
SQD-0205 (BAE MRAP) - Armox: 72 hrs
ABS Hull Welds (American Ship) – HYS: 72 hrs
API (Gas and Petroleum) – 72 hrs

Tyrone
Up Topic American Welding Society Services / Technical Standards & Publications / Time for NDT

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