Abstract
In the present paper the results of a study dealing with the absorption of hydrogen during arc melting are presented. Arc melting experiments were carried out in an argon-hydrogen atmosphere on small samples of pure iron under stationary arc conditions. The hydrogen absorbed by the sample was measured under various process conditions. Attention was focused on the time dependence of the absorption and on the influence of the hydrogen partial pressure in the shielding gas on the absorption process. The amount of hydrogen lost during cooling of the sample after extinction of the arc was calculated numerically, using a finite element method. This made it possible to determine the hydrogen concentration of the sample at the moment of extinction of the arc. The results obtained can be qualitatively explained in terms of a simple model, which was developed for hydrogen absorption under stationary arc conditions.
MST/3036
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