How do I calculate Preheat Temperature (Implant / CEN Method)?

To calculate Preheat Temperature (Implant / CEN Method): Enter Carbon Equivalent CET, Combined thickness t, Hydrogen content HD and other values. Click Calculate. INDUGRID computes the result instantly using the formula: CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40 | Tp = 697×CET + 160×tanh(t/35) + 62×HD^0.35 + (53×CET − 32)×Q − 328. No registration required.

What units does the Preheat Temperature (Implant / CEN Method) calculator use?

The Preheat Temperature (Implant / CEN Method) calculator uses the following units: mm, ml/100g, kJ/mm. SI units are used by default.

Welding & Joining

Preheat Temperature (Implant / CEN Method)

Calculate minimum preheat temperature for welding carbon and low-alloy steels to avoid hydrogen-induced cold cracking, per EN 1011-2 Annex C (CEN method).

Units:

in LinkedIn

💡Preheat is critical for steels with CE > 0.40 and for thick sections. Preheat slows cooling, allows hydrogen to escape and reduces hardness. Measure with contact thermometer on both sides within 75mm of joint.

CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40 | Tp = 697×CET + 160×tanh(t/35) + 62×HD^0.35 + (53×CET − 32)×Q − 328

Input

Carbon Equivalent CET iCET (Brite-Euram formula) from mill certificate. CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40. Typical S355: 0.30–0.40.

Combined thickness t iCombined thickness: for butt welds = plate thickness; for T-joints = sum of connected plate thicknesses.

Hydrogen content HD iDiffusible hydrogen in deposited weld metal. From consumable certificate or HD class: HD5 = low, HD10 = medium.

ml/100g

Heat input Q iWeld heat input in kJ/mm. Calculate using heat input formula above.

kJ/mm

Result

Minimum preheat Tp [°C] —

Recommended preheat [°C (rounded up to 25°C)] —

CE class —