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Monday, April 8, 2013

Re: [MW:17313] PWHT for P15E to P3

This is generally unusual combination due to PWHT issues
 Step 1-- is to weld puff piece of P5A matl with P15E and carryout PWHT and then weld P3 and carry out PWHT
 step-2    Butter P15E with B3 filler and carry out PWHT and join P3 matl
 Step-3, If use Cr content wire less than 3%, then minimum PWHT temp for P15 E is around 705 degree celsious

Pandithan
Welding Consultant
             




On Mon, Apr 8, 2013 at 4:42 PM, Binoy Soman <binoy.spp@daelim.co.kr> wrote:

Thanks Hedge,

 

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

 

Dear Mr Binoy

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

 

Regards

Hegde

 


 C
--- On Mon, 8/4/13, Binoy Soman <binoy.spp@DAELIM.CO.KR> wrote:


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

Dear experts,

 

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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