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Re: [MW:23249] RE: 23237] Welding P91 without PWHT

By Materials & Welding
To the best of my knowledge NBIC has not such a provision for P91

Sent from my BlackBerry 10 smartphone.
From: pgoswami
Sent: Σάββατο, 9 Μαΐου 2015 - 16:43
To: materials-welding@googlegroups.com
Reply To: materials-welding@googlegroups.com
Subject: [MW:23245] RE: 23237] Welding P91 without PWHT

Hi Jose,
 
Strictly as per all design and construction codes as well as the  various recommended practices, "PWHT" on grade 91 steel is must after welding.
 
Off late there had been thoughts to push " Temper bead repair technique in NBIC " by EPRI (Electric Power Research Institute).You may search in google under" temper bead welding on grade-91 steel or other suitable titles" to get more details.
 
In order to achieve those one has to have "PQR " qualified separately as well as the welding  consumables may be different.Which may need some lead time and preparations.
 
I would think the trouble free option without any prior preparations would be to PWHT the welds.
 
Please see the link below, whether I' ad posted the link to NBIC document containing an EPRI presentation.
 
Thanks,
 
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineer/Specialist
Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
 
 
https://www.linkedin.com/grp/post/122787-198284274
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of José Luís Ferreira
Sent: Friday, May 08, 2015 10:15 AM
To: materials-welding@googlegroups.com
Subject: [MW:23237] Welding P91 without PWHT

Is there an alternative to weld P91 to P91 (Cr-Mo-V) without performing PWHT? I need to weld (repair) small valves (socket welds) in field.

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