Re: [MW:9502] buttering on weld edges

Dear Mehta,

If you want to weld Stainless Steel such as SS316 to P91 material, normally most of the codes would require PWHT (approx. 760 deg) of P91 material, however SS316 would get sensitised at this temperature, to avoid this you can use Nickel weld base metal (ERNiCr-3) on P91 and do PWHT, later use same ERNiCr-3 to weld between P91 and SS316 without any PWHT.

Hope this helps

Regards
Manpreet Singh



On Tue, 25 Jan 2011 23:33:48 +0530 KRISHNASAMY MASANAM wrote
> Dear Manpreet Singh
> Pleasecould you explain itemNo. (2): to avoid PWHT , not to sensitize material, for eg:- Stainless steel.If we are made buttering on edge in stainless steel,how it willavoid PWHT?Please...
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Thanks & Best regards

Krishnasamy. M

Welding Inspector

Fize Al- Shammary Gen. Cont. Est.

Kingdom of Saudi Arabia.

Mob: +966 592823768

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Date: Tue, 25 Jan 2011 02:27:16 +0000
>To: materials-welding@googlegroups.com
>Subject: Re: [MW:9441] buttering on weld edges
>From: manpreetsin88@rediffmail.com
>
>Dear Mehta,
>
>There are mainly 2 purposes to carry out buttering:-
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>(1) To compensate for poor joint preperation (wide root gap), material is added to both faces of joint.
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>(2) to avoid PWHT , not to sensitize material, for eg:- Stainless steel,
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>Regards
>Manpreet Singh
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>On Mon, 24 Jan 2011 18:29:23 +0530 Fitria Rahman wrote
>>

Dear Mehta

Buttering weld is procedure to rectify wide gaps(root openings) greater than those permitted by AWS D11 (normally found intubular joint in structural connection) and/or client specification, but notgreater than 19 mm or twice the thickness of the thinner part, whichever islesser. Procedure shall be qualified.

Fitya a

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2011/1/25 B D Mehta <bdmehta.sap@isgec.com>
>>

Dear All
>
>Any body can explain me why we do buttering on weld edges ofsimilar materials before welding .
>
>Regards
>B.D.Mehta
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>

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