From: pgoswami [mailto:pgoswami@quickclic.net]
Sent: Tuesday, August 09, 2011 5:24 PM
To: 'materials-welding@googlegroups.com'
Subject: FW: 12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91
Sent: Tuesday, August 09, 2011 5:16 PM
To: 'materials-welding@googlegroups.com'
Cc: 'John Henning'
Subject: RE: 12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91
John,
The attached information on alloy 230 would be of help to you. For DMW of P-91#Alloy 230, fillers matching chemistry of alloy230 would be advisable .You may have to butter P-91 ,PWHT separately then join to alloy 230. Or use of a transition piece (P91# Alloy 230) could expedite the filed work.
It may be good to contact Haynes regarding the welding consumables and further welding recommendations. The second document H-3159 is more specific. I've highlighted some of the relevant texts for your reference.
This alloy is an extension of the hastelloy family. The common problems of welding an Nickel base alloy to P-91 should be taken into account for such welds.The diffusion issue would not be adequately felt at the time of fabrication , but would surface after years of service. Definitely one common issue would be Carbon migration form P-91 to Alloy-230 weld and HAZ interface , which may weaken the P-91 alloy. However this diffusion is highly design/service temperature oriented. Dilution during the buttering of P-91 should be kept as minimal.
It may be a good idea to check such experiences with Haynes.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of J
Sent: Monday, August 08, 2011 6:56 PM
To: Materials & Welding
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.
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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.
No comments:
Post a Comment