RE: [MW:4980] Carbone Equ.

Hydrogen levels of the filler metals should also be taken into
consideration and may allow for a reduction in preheating
Best Regards

PHIL CHEW
Global Segment Manager -Transport ,Shipbuilding,M&R

ESAB Holdings Ltd, 322 High Holborn, London, UK, WC1V 7PB

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"Jambhale, Rupesh
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Subject
28/04/2010 09:39 RE: [MW:4977] Carbone Equ.


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materials-welding
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Dear Tamer,

Carbon equivalents (CE) seek to account for the sum of the effects of the
several elements present in steel on its hardenability, and thus the
susceptibility of a weld to cracking. It calculates the steel's potential
to form martensite or strengthening carbides based upon the steel
chemistry. The higher the carbon equivalent, the harder the steel becomes
and more prone to cracking upon cooling. Steels with carbon equivalents
(CE) less than 0.4 percent are typically easy to weld and welded without
special welding methods.

Different codes/ Standards/ literature specify different formulae for
calculating CE. Most widely followed is AWS D1.1 which is as follows

CE = C + (Mn + Si)/6 + (Cr + Mo + V)/5 + (Ni+Cu)/15

However, Hardnability can be also controlled by pre-heating and thereby
reducing the cooling rate and preventing the formation of martensite

Regards,
Rupesh A. Jambhale
Inspection Department,
Oil, Gas & Petrochemical Division,
Mott MacDonalds Consultants ( I) Pvt Ltd., Mumbai

-----Original Message-----
From: materials-welding@googlegroups.com [
mailto:materials-welding@googlegroups.com] On Behalf Of tamer said
Sent: 28 April 2010 13:53
To: materials-welding@googlegroups.com
Subject: [MW:4974] Carbone Equ.

Why CE calcuations is essential ???
is it for corrosin or weldiability.
thx

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