Post-Weld Hydrogen Bake-Out Calculator

Calculate required post-weld hydrogen bake-out time and temperature to reduce diffusible hydrogen to safe levels per AWS D1.1

Input Parameters

Results

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Required Bake-Out Time
hours
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Minimum Bake Temperature
°C
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H Reduction
%
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AWS D1.1 Requirement
Note: Hydrogen bake-out (PWDHT) drives diffusible hydrogen out of the weldment. AWS D1.1 requires 200°C (400°F) minimum for carbon steels. Higher-strength steels need more aggressive bake-out due to greater HIC susceptibility. Must begin within 1 hour of welding.

Reference

Post-Weld Hydrogen Bake-Out: Based on Fick's diffusion law with D = D0×exp(-Q/RT) t = 0.049 × L²/D × log2(H0/Ht) AWS D1.1: Minimum 200°C (400°F) for 1 hr per 25mm thickness Target: <1 mL/100g diffusible hydrogen for crack-free welds