3 hours soaking time is not a good practice. Although when impact is not required there is no Code violation, I would not use such a long time in production
2016-11-15 18:07 GMT+02:00 'Prakash Hegde' via Materials & Welding <materials-welding@googlegroups.com>:
Hi!If requiremnt is of non suplimentry essential then you are satisfying the requiremnt and use present pqr to prepaare wps accordingly
Yes there is a deteoriation of impact strength with increase on soaking time /temp(refer LM patameter) therefore code restrict T and T of soaking QW407.2 for suplientary.essentialRegardsHegde
if supplementary essential not required,then can we use existing 3 times PWHT cycle PQR for production weld thickness 25mm with SR cycle 1 hour.
1) What will be the effect of soaking time range higher on production weld if same existing 40mm thk PQR used on 25mm production weld with same soaking time as per PQR..
As per QW-407.2 .Soaking time and temp equivalent or at least 80% aggregate of encounter production weld.Soaking time not restricted for exceeding higher side.
please correct me if my interpretation is wrong.
Regards,
Vivek Pandey
On Tuesday, 15 November 2016 09:04:08 UTC+5:30, George Dilintas wrote: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 WPS2016-11-14 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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--Dr. Georgios Dilintas,Dipl. Ing. In Aeronautic and Space EngineeringPh.D in Mechanics of Solids - Computational MechanicsA.I.S, A.N.I, IRCA Lead AuditorWelding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
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