Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
From: pgoswami [mailto:pgoswami@quickclic.net]
Sent: Tuesday, February 07, 2012 8:15 PM
To: 'pradip kumar sil'
Cc: 'materials-welding@googlegroups.com'
Subject: RE: ASTM A-312 TP-347 with ER-308H filler
Hi Pradip,
You may weld Tp 347 with 308H welding consumable using the existing PQR and WPS.A change of AWS classification is a supplemental essential variable(see QW.404.12(F). 308H was developed primarily for power industry and many client prefer this to prevent creep ductility cracking which may occur later in service and is a common occurrence in boiler supreheaters and reheaters.. However if high temperature corrosion in refinery or petrochemical environment is a concern then 308H weld metal may not provide this adequately.
You need to discuss this issue with client and a reputed consumable manufacturer to be sure of the supply and quality before deciding to use this electrode.
See the attached information for your reference.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario, Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
-----Original Message-----
From: pradip kumar sil [mailto:pradipsil@gmail.com]
Sent: Tuesday, February 07, 2012 9:59 AM
To: materials-welding@googlegroups.com
Cc: pgoswami
Subject: ASTM A-312 TP-347 with ER-308H filler
Dear Sir,
My client requested to weld at ASTM A 312 TP-347 material with consumable ER-308H but i have one wps which is base material TP-347 with consumable ER-347.
Our conventional practice TP-347 material with filler ER-347 because this material has stabilizing component NIOBIAM.
Client is insisting us to weld with ER-308H even they are not approve our wps.
Can provide some metallurgical information of ER-308H/ER-347 filler material of the above mention subject.
Thanks in advance
Regards
Pradip Kr. Sil
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