The Paton Welding Journal, 2000, №07

2000 №07 (02)

2000 №07 (04)

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The Paton Welding Journal, 2000, #7, 17-20 pages

Thermodynamic analysis of redox carbon-involving processes occurred during fusion welding

N.G. Efimenko, N.A. Kalin

Ukrainian Engineering-Pedagogical Academy, Kharkov, Ukraine

Abstract
The article suggests an approach to thennodynamic calculation of chemical reactions proceediDg in three phases, i. e. metal, slag and gas, at the same temperature. Series of the probable proceeding of reactions of oxidation of elements and reactions of carbon reduction of elements from oxides have been arraagwl for characteristic temperatures of the melting zone in arc welding. It is shown that temperature of beginning of carbon reduction of oxides in the metal phase, except CeO2, and FeO, is lower than that in the slag phase which allows the deoxidation process to occur at lower temperatures and provides the possibility of using carbon in a bound state as a deoxidizer in welding consumables,
Keywords: isobar-isothermal potential, chemical affinity, dissociation pressure, phase, oxidation, reduction, oxidizer, reaction constant, melting zone

References

1. Efimenko, N.G., Kalin, N.A. (1978) Deoxdizi ability of rare-earth elements as compared with known deoxidizers. Svarochnoye Proizvodstvo, 10, 1-2.
2. Kokh, B.A. (1975) Fundamentals of thermodynamics of metallurgical processes of welding. Leningrad: Sudostroyeniye.
3. Kulikov, I.S. (1975) Deoxidation of metals. Moscow: Metallurgia.
4. Filippov, S.I. (1966) Theory of metallurgical processes. Moscow: Metallurgia.
5. Gulyaev, A.P. (1978) Metals science. Moscow: Metallurgia.
6. Pokhodnya, I.K. (1972) Gases in welds. Moscow: Mashinostroyeniye.
7. Kazachkov, E.A. (1988) Calculations related to the theory of metallurgical processes. Moscow: Metallurgia.

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Suggested Citation

N.G. Efimenko, N.A. Kalin (2000) Thermodynamic analysis of redox carbon-involving processes occurred during fusion welding. The Paton Welding J., 07, 17-20.

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