Hi,
Code restrict the minimum temperature and time only. According to QW-407.2, if your PQR meets the 80% and or more than the actual PWHT time and temperature, you can use for production weld and PWHT.
In your case it meets the Code requirement i.e more than the 80%(32 minutes) of production PWHT condition , so you can use this PQR.
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
German-Thai Boiler Engineering Cooperation Limited.
Rayong Factory ;
379 Moo.6 Soi 8, Tambol Pananikom,
Nikompattana, Rayong 21180 THAILAND
Tel : +66 38 897 035-9 Ext. 137
Fax : +66 38 897 034
Hand Phone: 0066 892512282
From: JASPAL SINGH <jaspaldhesi@gmail.com>
To: materials-welding@googlegroups.com
Sent: Thursday, October 18, 2012 2:26 PM
Subject: [MW:15682] Re: Interpretation of Clause QW 407.2 of ASME SEC. IX
Dear Satish,
From the data it seems that the material is either P4 or P5. Impact testing may be there either at -18 or -29.
The understanding of the clause is little logical.
" Procedure qualification test shall be subjected to PWHT essentially equivalent to that encountered in the fabrication of production welds"
or including at least 80% of the aggregate times at temperature(s).
So in your case PQR is qualified with 95minutes PWHT.
But as per this clause lower limit is 32 minutes in the PQR. So your PQR is meeting the minimum requirement. But upper limit is essentially equivalant to the production which is 40minute but you have 95 minute.
So in my openion you can not use this PQR, as it is not the true representation of actual weld conditions.
Regards
Jaspal Singh
On Tuesday, October 2, 2012 5:36:27 PM UTC+5:30, shah satish wrote:
Dear All,--
Hi,
I have a one PQR with PWHT,Heat treatment cycle is 660 - 665 Deg. C
Temp. and time 95 minutes, and my job Heat treatment cycle 660 - 665
Deg. C. Temp and soking time 40 minutes (min).can i use this pqr for
job.
Thanks
Satish,
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