Carbon Equivalent Calculator for Steel Weldability Assessment (CEV ≤ 0.45)
Formula
CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15
Governing Standard
IIW (International Institute of Welding) Formula — AWS D1.1 and API 5L
Required Inputs
- Carbon (C) in %
- Manganese (Mn) in %
- Chromium (Cr) in %
- Molybdenum (Mo) in %
- Vanadium (V) in %
- Nickel (Ni) in %
- Copper (Cu) in %
Output
Carbon Equivalent Value (CEV) and Preheat Recommendation
Notes
CEV < 0.40: Excellent weldability, no preheat required. CEV 0.40-0.45: Good weldability, 50°C preheat recommended. CEV 0.45-0.50: Fair weldability, 100°C preheat required. CEV 0.50-0.55: Poor weldability, 150°C preheat required. CEV > 0.55: Very poor, 200°C+ preheat — consult WPS and consider alternative materials.
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