Re: [MW:25698] PWHT T-T Cycle Range for WPS with Impact Requirement

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 <bhaveshpatil18@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 Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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