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Re: [MW:13156] Dissimilar welding SS 316 to A335GrP5

By Materials & Welding

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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