Carbon Equivalent Formula as per IIW and AWS

Refer Carbon Equivalent Value chart to check the Weldability of alloys. For engineers it is necessary to know the carbon equivalent value (CEV) specially for the welding process. Carbon Equivalent Calculator can help to give an accurate idea to the welders and project engineers.

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Carbon Equivalent (CE) Value	Material Weldability
Up to 0.35	Excellent
0.36-0.40	Very Good
0.41-0.45	Good
0.46-0.50	Fair
Over 0.50 Excellent	Weldability Poor

Carbon Equivalent Formula

The formula of International Institute of Welding (I.I.W.) is used in the above CE Calculator. To get the accurate results there should be a minimum 0.18% in carbon value. Here are two Carbon Equivalent Formulas of I.I.W.

1st Carbon Equivalent Formula

Use this formula for more than 0.18% carbon content

CEV (%) = %C + %Mn/6 + (%Cu + %Ni)/15 + (%Cr + %Mo + %V)/5

2nd Carbon Equivalent Formula

This formula must be used with less than 0.18% carbon content

CEV (%) = %C + %Si/30 + (%Mn + %Cu + %Cr)/20 + %Ni/60 + %Mo/15 + %V/10 + 5(%B)