Re: [MW:18566] PWHT range for WPS

Dear Mr Ram Patel

Given my opinion below

Regards

Hegde

 

From: Ram Patel <rampatelindia2013@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 2 September 2013 11:29 AM
Subject: [MW:18561] PWHT range for WPS

Dear Experts

Can anybody explain me following about WPS & PQR as per ASME sex IX.

If my PQR qualifed with soaking temperature 630 deg. C to 650 deg. C and soaking time 2 hrs 30 minutes maximum, so my question is can WPS qualify for temperature range 600-620 deg.c or above 650 deg.c and soaking time 3 hrs or 2hrs

It depends upon  Impact requirement i) If your PQR is qualified for Non Impact requirement in this case You have to satis fy QW407 .1   where The PWHT temp below crirical tempi.e. 720C   is acceptable and you can use PWHT temp between 600-720C However () Please bear in mind that CS grade  UTS deteoriates with Higher temp PWHT with higher soaking time even say above 650C-720C  .PWHT hence generaly the UTS0f  CS component being PWHT between 600-630C ( some time even at 650C PWHT deteriotes)

ii) In case of Impact requirement -You require to satisfy QW407.1 and 2  where time and temp of PWHT is suplimentary Essential

Generaly some of the licensor do not allow PWHT temp above 630C  for CS and they will agree only when you qualify PQR separately at that higher temp say above 650C but below 700C

My question for which temperature range or soaking time range I can use for WPS if my PQR qualified as per above mentioned PQR range ?.

Thanks in advance

Thanks

Ram

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