For that reason I suggested to check the FN. If it is lower than 5 the risk of hot cracking is high. Attention that this FN estimation depends on the dilution rate
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: "John Henning" [jhenning@deltak.com]
Sent: 06/12/2011 09:14 CST
To: <materials-welding@googlegroups.com>
Subject: RE: [MW:13155] Dissimilar welding SS 316 to A335GrP5
One of those general “rule of thumb” things I learned as a welder: you weld Inconel over stainless steel but you should never weld stainless steel over Inconel.
The reason is that you have a very, very high probability of hot cracking at the stainless steel weld to Inconel fusion line. The unmixed zone will solidify wholly austenitic and will have cracks. I have had a great deal of empirical evidence to support this rule – better you should not.
So if you are going to use a nickel based material for buttering do not try to go cheap and use stainless for the weld – you will most likely regret it.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of james gerald
Sent: Tuesday, December 06, 2011 3:42 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:13150] Dissimilar welding SS 316 to A335GrP5
It would be better to butter the P5 portion say 5 mm with ENiCrMo3, perform PWHT and weld it with 316SS .
Thanks & Reagrds
J.Gerald Jayakumar
00968-93281596
From: "george.dilintas@gr.bureauveritas.com" <george.dilintas@gr.bureauveritas.com>
To: materials-welding <materials-welding@googlegroups.com>
Sent: Tuesday, December 6, 2011 12:46 PM
Subject: Re: [MW:13149] Dissimilar welding SS 316 to A335GrP5
I would not suggest to direct them directly. What are your thicknesses?
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager
From: "Ashok Raman B Kutty \(MNT/PPTSB\)" [ashokraman_kutty@petronas.com.my]
Sent: 06/12/2011 09:27 ZE8
To: <materials-welding@googlegroups.com>
Subject: [MW:13145] Dissimilar welding SS 316 to A335GrP5
We need to weld a SS 316 Return bend to 5 Chrome, 0.5 Mo alloy steel furnace tube. The electrode proposed is ENiCrMo3. The return bends are in a header box adjacent to the radiant section (horizontal tube furnace – crude distillation unit).
Is PWHT required to be done after welding?
Thanks
Ashok
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