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What is a good carbon equivalent value for welding?

CEV below 0.40 requires no preheat. CEV 0.40-0.48 needs 50-100°C preheat. CEV above 0.48 requires 100-200°C preheat to prevent hydrogen-induced cracking.

What is the carbon equivalent of S355 steel?

S355 J2 typically has a CEV of 0.38-0.43, which falls in the good weldability range. Preheating may be needed for thick sections or low heat input welding.

carbon equivalent · Engineering Calculator

Carbon Equivalent Calculator for S355 J2 Structural Steel

Formula

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

Governing Standard

IIW (International Institute of Welding), AWS D1.1

Required Inputs

Carbon C (%)
Manganese Mn (%)
Chromium Cr (%)
Molybdenum Mo (%)
Vanadium V (%)
Nickel Ni (%)
Copper Cu (%)

Output

Carbon Equivalent Value (CEV) and weldability classification

Notes

For S355 J2, typical CEV is 0.38-0.43. CEV below 0.40 = excellent weldability (no preheat needed). CEV 0.40-0.48 = good (preheat 50-100°C). CEV > 0.48 = poor (preheat 100-200°C required).

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