1979 Volume 48 Issue 7 Pages 504-509
This paper deals with the effect of welding conditions on hydrogen concentration at the root of weld metal. The calculations of hydrogen concentrations in weld metal and HAZ are done by means of two dimensional finite difference method based upon hydrogen diffusion equation which is composed of temperature, stress and strain terms.
The results obtained in this report are summarized as follows:
(1) Hydrogen diffusion equation and numerical method for hydrogen concentration at the root of joint are described.
(2) On comparison of hydrogen concentrations among single-bevel-groove, double-Vee-groove and implant specimen, hydrogen concentration of single-bevel-groove turns out to be largest.
(3) The influence of stress term on hydrogen concentration is large as compared with strain term.
(4) Hydrogen concentration at the root of joint increases with yield strength of weld metal increasing and transformation temcerature of cooling process decreasing.