Sorry Buttering should be of P3 material i.e. 80SD2 on P91 say thk of 6mm However PQR to be qualified accordingly i.e If Carried on Pipe then On P91 pipe at the weld edge butter by P3 material ii) This buttered pipe to be PWHT at 730 same as on the job iii) Weld a same PQR coupon i.e One pipe of P91 with buttered and PWHT at 730 and second pipe of P3 material and Joint the same with P3 Filler This coupon of PQR to be tested w/o PWHT This will satisfy your all condition Regards Hegde Hegde
--- On Mon, 8/4/13, Binoy Soman <binoy.spp@DAELIM.CO.KR> wrote:
From: Binoy Soman <binoy.spp@DAELIM.CO.KR>
Subject: RE: [MW:17312] PWHT for P15E to P3
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Monday, 8 April, 2013, 4:42 PM
Buttering shall be with P91 filler? If so, kindly explain the basic technical reason. S.Binoy From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Prakash Hegde
Sent: Monday, April 08, 2013 12:55 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:17311] PWHT for P15E to P3 i) As per ASME code P3 Gr 1,2 does not require PWHT if its thk is less than 16mm and For Gr3 It is manadatory for any thk and temp is min 593 C ii) For P15E (P91) the PWHt is mandatory at 730C Now if the weld joint P15E to P3 undergoesPWHT at 730C temp It will be afftecting the mechanical properties of P3 ( C% 0.5 Mo) Therefore My openion is Better butter the weld edge of P15E with suitable P91 filler and conduct the PWHT of P15E (P91)as per code at 730C and later on weld that edge with P3 (C % 0.5Mo) consumable and that joint need not be PWHT if it is P3 Gr1 or 2 In this case re is no deteoriation of P3 properties However PQR require to be qualified with above condition
From: Binoy Soman <binoy.spp@DAELIM.CO.KR>
Subject: [MW:17309] PWHT for P15E to P3
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Monday, 8 April, 2013, 1:44 PM
Kindly explain about PWHT requirement while welding two materials among which one require PWHT by code and other does not (Eg; P15E to P3 materials). What should be the cycle that must be followed, Is it the same that of P 15E to P 15E?. Considering the lower critical temperature of P3 material , I select 700-730°C temperature range for PWHT of P15E to P3 (correct me if I am wrong). P15E to P15E PWHT cycle that we are following is attached. S.Binoy --
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