The Paton Welding Journal, 2003, №02

2003 №02 (12)

2003 №02 (02)

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The Paton Welding Journal, 2003, #2, 2-9 pages

Mathematical modelling of processes of interaction of metal with gases in arc welding

I.K. Pokhodnya

E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
Results of thermodynamic investigations of interaction of molten metal with a gas, containing hydrogen, oxygen and compounds of fluorine, and also with a slag phase are given. Taking into account the non-stationary conditions and variable rate of crystallization the laws of redistribution of hydrogen in a crystallizing weld pool are established. The formulated mathematical models are based on a differential equation of mass transfer, in particular, the Fick’s equation with boundary conditions of Stefan type on the moving phase interface. Kinetics of hydrogen redistribution near the fusion line, and also in molten metal at a cellular crystallization was studied. The process of growth of a gas bubble in weld pool is described
Keywords: welding, absorption of gases, hydrogen, crystallization, weld pool, porosity

References

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Suggested Citation

I.K. Pokhodnya (2003) Mathematical modelling of processes of interaction of metal with gases in arc welding. The Paton Welding J., 02, 2-9.

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