Re: [MW:18889] PWHT Requirement for dissimilar welding b/w P91 & SS304

Dear all,

  we had the same case, our client requested to us with qualified WPS to weld directly with  ERNiCr-3 and perform PWHT according P91 pwht parameters;

Construction code : ASME B31.1

Any comments, please advise ;

Regards.

2013/10/9 pgoswami <pgoswami@quickclic.net>

Hello Abhisekh Rai,

 

As explained by the other members , Buttering Grade-91(with Inconel -82/182) , performing PWHT , and thereafter welding SS304 would be the way to go. The welds between P-91 and SS 304 should subjected to PWHT as the last resort.

 

If there're many such dissimilar weld  joints and PWHT is the only solution then the attached  welding consumable could be a good option.(Note I'm not selling this product, acceptance is subject to vendor's interpretation).

This product was developed by EPRI & Metrode, see the detail in the attached documents. The only problem is it lacks AWS classification.

 

Hope this would be of help.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pgoswami@sympatico.ca

 

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Abhishek Rai
Sent: Monday, October 07, 2013 8:32 AM
To: pgoswami
Cc: materials-welding@googlegroups.com
Subject: Re: [MW:18870] PWHT Requirement for dissimilar welding b/w P91 & SS304

Dear Sir ,

the thickness of P91 material is 21 mm and for SS304 material is 12 mm. This is the fillet joint for support as running pipe is of P91 material and support pad is of SS304 H.

Please advise for PWHT & WPS .

Regard's

Abhishek Rai

On Mon, Oct 7, 2013 at 4:05 PM, pgoswami <pgoswami@quickclic.net> wrote:

Hello Abhisekh Rai,

 

What's the thickness involved here ??

 

Thanks

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pgoswami@sympatico.ca

 

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of HAREESH K V
Sent: Monday, October 07, 2013 3:26 AM
To: materials-welding
Subject: Re: [MW:18867] PWHT Requirement for dissimilar welding b/w P91 & SS304

Sa335 Gr P91 side to be buttered up to a minimum of 13mm with ERNiCr-3. Then PWHT to be done for that side as per the requirement of P91 to P91 welding (Normally 720 deg temperature up to a minimim of 2hrs). Then face prepration is to be done (Ensure a 13mm buttering after this face prepration)

Then prepare the joint b/w P91 and SS304 and weld with ERNiCr-3

No PWHT requirements after this

On Sun, Oct 6, 2013 at 2:05 AM, Octane Mac <octane.mac@gmail.com> wrote:

B31.3: 704-760 C, minimum holding time 2 hrs. Holding time 1hr/in.

B31.1: 730-775 C, minimum holding time 30 minutes. Holding time 1hr/in. Note: As it is a dissimilar material welding and a nickel based consumable is recommended therefore minimum holding temperature shall be 700 C.

Octane

On Fri, Oct 4, 2013 at 7:33 PM, Abhishek Rai <abhishekkrrai@gmail.com> wrote:

Dear Sir,

Please confirm the requirement of PWHT b/w welding of P91 & SS 304.the operating temperature of piping is 640 deg c .

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