Dear Manoj,
Please also refer as mentioned in ASME SEC IX for your query.............
| QW-406.3 | PREHEAT | An increase of more than 55Deg C in the maximum interpass temperature recorded on the PQR. This variable does not apply when a WPS is qualified with a PWHT above the upper transformation temperature or when an austentic or P No. 10H material is solution annealed after welding. |
On Sat, May 22, 2021 at 9:19 AM Manoj Mumbai <manojacgnr@gmail.com> wrote:
Dear Experts,--The preheat temperature shall not be less than 55 deg. C as per QW-406.1 but not specified a maximum how much it can be from the temperature noted in PQR as preheat temperature is minimum temperature and interpass temperature is the maximum temperature.My question , Is there any limitation to increase preheat temperature than mentioned in PQR. suppose PQR temperature is Ambient, say 38 deg. C, can we increase preheat temperature to 204 deg. C. I have a qualified procedure of P6 material at ambient temperature 38 deg.C now I have to include preheat temperature.Thanks in advance for your expert opinion.Manoj.
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