In addition to the two listed, there is one additional case where buttering may be performed. Buttering may be performed to provide a buffer layer between incompatible materials or to enhance the weldability of a joint between dissimilar materials. While I am sure there are numerous examples, one instance I have experienced is welding Monel K500 to carbon steel – the Monel K500 was buttered with Monel prior to making the weld to avoid weld metal and HAZ cracking.
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of manpreet
Sent: Monday, January 24, 2011 8:27 PM
To: materials-welding
Subject: Re: [MW:9441] buttering on weld edges
Dear Mehta,
There are mainly 2 purposes to carry out buttering:-
(1) To compensate for poor joint preperation (wide root gap), material is added to both faces of joint.
(2) to avoid PWHT , not to sensitize material, for eg:- Stainless steel,
Regards
Manpreet Singh
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
>
>
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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