Re: [MW:23257] RE: 23237] Welding P91 without PWHT

I agree. Congratulations on giving a free and correct opinion.

S.N.Bagchi.

On Saturday, May 9, 2015 7:13 PM, pgoswami <pgoswami@quickclic.net> wrote:

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

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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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