Dear Sir,
If we have PQR with PWHT for T-T 610°C & 3 Hrs. for Thickness 40mm as per ASME Sec. IX. for SMAW. Consequently we have WPS for Range of 5 to 200mm Thickness (PQR is tested for Impact at -27°C).
Now the Confusion is can we use same PQR to Prepare WPS for 25mm thick Production weld with T-T 610°C & 1Hrs if supplementary essentials are applicable? Now as per Table QW253 & QW 407.2 the production weld PWHT T-T cycle essentially Equivalent or at least 80%.
QW-407.2 A change in the postweld heat treatment
(see QW-407.1) temperature and time range
The procedure qualification test shall be subjected to
PWHT essentially equivalent to that encountered in the
fabrication of production welds, including at least 80%
of the aggregate times at temperature(s). The PWHT total
time(s) at temperature(s) may be applied in one heating
cycle.
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your range in case impact test is a requirement starts from 16 mm and not from 5mm (since your test coupon is 40 mm)Assuming the test coupon was Pno1 then the mandatory holding time was 1,6 hours and not 3 hours. Since you have used much more time than required you have to requalify your WPS
2016-11-14 11:40 GMT+02:00 Bhavesh Patil <bhavesh...@gmail.com>:
Dear Sir,
If we have PQR with PWHT for T-T 610°C & 3 Hrs. for Thickness 40mm as per ASME Sec. IX. for SMAW. Consequently we have WPS for Range of 5 to 200mm Thickness (PQR is tested for Impact at -27°C).
Now the Confusion is can we use same PQR to Prepare WPS for 25mm thick Production weld with T-T 610°C & 1Hrs if supplementary essentials are applicable? Now as per Table QW253 & QW 407.2 the production weld PWHT T-T cycle essentially Equivalent or at least 80%.
QW-407.2 A change in the postweld heat treatment
(see QW-407.1) temperature and time range
The procedure qualification test shall be subjected to
PWHT essentially equivalent to that encountered in the
fabrication of production welds, including at least 80%
of the aggregate times at temperature(s). The PWHT total
time(s) at temperature(s) may be applied in one heating
cycle.Thanks & Regards,
Bhavesh
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On Tue, 15 Nov, 2016 at 16:09, Vivek Pandey<vivek....@gmail.com> wrote:
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It is not a maximum but is a minimum. As the DBTT increases with increased time at temperature, the concern is that the procedure qualification coupon must see at least 80% of the time at temperature to be used in actual fabrication. If your qualification was performed with greater time than the minimum, it is assumed that this a worse case scenario than will be experienced in fabrication. Often, therefore, PQR test plates will be held for extended periods of time to allow for fabrication and a repair cycle or two, greatly exceeding the anticipated fabrication PWHT time.
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