Re: [MW:12161] ASME Section I - welding Alloy 230 (UNS N06230) to P91

P91 PWHT is mandatory. Therefore i would suggest to butter the P91 with a filler metal such to avoid a low FN and thus hot cracking, perform the PWHT and then weld the 230
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

----- Original Message -----
From: J [jhenning@deltak.com]
Sent: 08/08/2011 15:55 MST
To: "Materials & Welding" <materials-welding@googlegroups.com>
Subject: [MW:12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91

A customer has asked us to weld an Alloy230 drain line to a P91
superheater header. The unit is a heat recovery steam generator
designed to ASME Section I. While I have extensive experience with
P91 welding and heat treatment, however I am unfamiliar with Alloy
230. The purpose for using this nickle based alloy is to eliminate
oxidation damage and sagging of this particular drain line as it
typically has no flow during operation and therefore is uncooled. I
am looking for information from anyone who has experience with this
alloy and, better still, who has welded this particular couple.
Depending on material chosen for welding this dissimilar joint what
would be the metallurgical implications at the weld interface where
dilution effects and diffusion would be most pronounced. I do not
need catalog information. Thanks for any information.

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