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Abstract
The problem of diffusion of hydrogen in a weld of arbitrary shape has been solved by numerical means using the finite-element method. The rate of diffusion in an actual fillet weld has been analysed by this method and average concentrations and concentration contours have been derived as a function of time and linear dimensions. It is shown how these solutions can be used to derive a post-weld heat treatment that will enable either the average or spot hydrogen concentrations in a weld to be reduced to any chosen level.