Friday, January 7, 2011

[MW:9120] MW:9116-PWHT Of 347H

Mr Bazrafshan,
 
The recommended PWHT cycle looks like a stabilizing anneal.You may check the precise requirements of this  type of  PWHT in NACE RP-170-2004.The PWHT time looks extremely high ( 3 hrs for a thickness of 12.7mm/6.0 mm).Prolonged exposure at this temperature would be detrimental to toughness of the weld. Also Nb:C ratio is very important to prevent hot cracking or stress-relief cracking of 347H.
 
Feel free to exchange information, should you wish.
 
Thanks.
 
Pradip Goswami,P.Eng.
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bazrafshan,kazem
Sent: Thursday, January 06, 2011 4:49 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:9116] PWHT Of 347H

Dear Sir:

Thanks for support.

I am worry about mechanical and chemical properties of material after repeating Heat treatment. You know after new  PWHT the material will affected for 6 Hours. also May be we will found new cracks after PWHT, what can we do in order to prevent new cracks.

 

Regards

K.Bazrafshan

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Karthik
Sent: Thursday, January 06, 2011 12:24 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:9115] PWHT Of 347H

 

Hi,
PWHT can be repeated as per ASME Section VIII,Div.1-UHA-32 (e).Please find below the extraction.Holding time shall be the same as the original/as required by project spec.

UHA-32 (e) Vessels or parts of vessels that have been postweld
heat treated in accordance with the requirements of this
paragraph shall again be postweld heat treated after repairs
have been made.

Thanks & Regards,

 

(Karthik)

 

Karthikeyan.S

QA/QC Manager

Getabec Energy Co.,Ltd.

379,Moo6,Soi8,Nikhomphatana,

Rayong-21180,

Thailand.

Phone: 0066 38 897035-8 (Off)

Fax: 0066 38 897034

Hand Phone: 0066 892512282



--- On Thu, 1/6/11, Bazrafshan,kazem <KBazrafshan@BPC.CO.IR> wrote:


From: Bazrafshan,kazem <KBazrafshan@BPC.CO.IR>
Subject: [MW:9114] PWHT Of 347H
To: materials-welding@googlegroups.com
Date: Thursday, January 6, 2011, 3:28 PM

Dear All:

An urgent question:

Base on Project tech Documents we have to do PWHT( in 870°C for 3Hours,Air Cooled) for welding of 2 parts  as A312-347H(12.7mm) to A182-347H(6mm,) together((A182 is as a branch to A312). After performing PWHT we found some  cracks(dept of crack are  from 3 to 8 mm) Just in weld seam.

Joint Information:

Welding process: GTAM + SMAW.

Design Tem: 780°C and Design Pressure is 5.3Barg in convection coils.

Welding consumables are :E347H Esab, Wire ER347 esab.

 

Shall we repeat PWHT after repairing or not?

If reply is Yes, how much time shall be  Holding time ?

Please let me know your STD reference As well.

 

 

Thanks

Bazrafshan

 

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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No comments:

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