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, 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
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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