ASME PQR temperature

[hhssbb2206]

I have question about the PQR of P-No.4, FCAW process without impact test ans with PWHT below lower transition temparature.
A PQ test was conducted 8 year ago using ASEM 2001 Edtion. At that time, PWHT temperature required for VIII-div.1 was 1100 F minumum, but It had been changed from 2004 Edition to minimum 1200 F.
May that PQR be used for new WPS to be revised even though it does not meet the temperature requirement UCS-56 current edition?

 

[stanweld]

Yes

 

[weldtek]

I seem to recall that temperature being a typographical error which was corrected in the subsequent addendum.
Reviewing QW407.1 & .2 may help you reach a conclusion.
My take is as follows;
407.2 - Certainly if impacts apply you will need to requalify assuming the work will be PWHT'd at 1200 F min.
407.1 - Technically you meet this requirement, but, if it were me deciding, I'd re qualify at the higher temperature. I say this because it would be good practice, and offer some protection to you as the fabricator in that your test more closely represents the actual conditions to be seen.

 

[DVWE]

I agree with both posts above. Technically, both temperatures would be considered below the lower transformation temperature, and would not require requalification by code, but as mentioned the actual conditions should be tested as good practice. Can you say with confidence that per your WPS, an increase of 100 F for the PWHT will not affect the mechanical properties? It's up to you.

 

[metengr]

Yes, this was a typo in the 2001 Edition and was subsequently corrected. Agree with stanweld.

Keep in mind that subcritical PWHT for ASME application deals with minimum temperature to ensure adequate ductility, and minimum strength and lower residual stress is achieved. If anything, PWHT using 1100 deg F would result in lower ductility and higher strength (which you cannot take credit for this) and higher residual stresses. If the PQR was certified at 1100 deg F, increasing the PWHT to 1200 deg F will only serve to increase ductility, lower strength and lower residual stresses. In my mind, no requal is required because the PWHT was performed under less conservative conditions for the weld and BM HAZ.

 

[hhssbb2206]

Thanks great help!!