RE: [MW:13154] Dissimilar welding SS 316 to A335GrP5

Hi Ashok,

API RP-582 clause 6.2 describes well the overall scenario.As per table-3 E-NiCrMo-3 consumable is recommended in Non-Sulfur environment, below 1100 Deg F and for sulfur environment below 900 DegF.

E-NiCrMo-3 is fully  austenitic consumable , hence you would not require the ferrite restriction as like austenitic S.S weld metal.Table -A-2 of the same RP-582 gives the rcomemndations on selection of welding consumables as function of design temperature and other service requirements.

It would be appropriate to deposit a buttering layer of 5-8 mm( 2-4 layers) with E-NiCrMo-3 electrodes and PWHT the P5  furnace tubes  as per the guidelines of B-31.3 code or Table-5 of RP-582 or appropriate project specifications.

Perform LPI on the buttering following PWHT and complete the butt joint with E-NiCrMo-3 consumables.

For 316-P5 dissimilar weld joint it's advisable not to expose 316S.S to PWHT in the vicinity of 700-750 deg C.This may initiate formation of sigma phases which may escalate latyer i service.

Thanks.

P.Goswami, P.Eng, IWE

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Subject: Re: [MW:13153] Dissimilar welding SS 316 to A335GrP5
From: george.dilintas@gr.bureauveritas.com
Date: Tue, 6 Dec 2011 12:37:14 +0100
To: materials-welding@googlegroups.com

The problem may be  at the dilution between your filler metal and the P5 material. So based on the skills of the welder you can assume a dilution and calculate the FN with the WRC diagram
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

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  From: james gerald [gerry_tup@yahoo.com]
  Sent: 06/12/2011 03:01 PST
  To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
  Subject: Re: [MW:13152] Dissimilar welding SS 316 to A335GrP5

Dr.George,

 

How do check Ferrite number in Inconel welds. Is it by Magnetic method.

 

I suppose this could be done only by calculating the Dilution.

 

Does Ferrite number prevents Hot cracking in Inconel welds. What is the significance.

 

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 2:34 PM
Subject: Re: [MW:13151] Dissimilar welding SS 316 to A335GrP5

Provided you do not get a FN lower than 5
Best regards
Dr Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
HBS Regional Technical Manager

  From: james gerald [gerry_tup@yahoo.com]
  Sent: 06/12/2011 01:42 PST
  To: "materials-welding@googlegroups.com" <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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