The Paton Welding Journal, 2001, №03

2001 №03 (12)

2001 №03 (02)

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The Paton Welding Journal, 2001, #3, 2-9 pages

Model of evaporation of metal in arc, laser and laser-arc welding

I.V. Krivtsun

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

Abstract
The model of multicomponent plasma formed near the metal surface in gas-shielded arc, laser and laser-arc welding is suggested. The model is based on the system of balance relationships for flows of heavy particles, their momentum and energy in the Knudsen layer near the surface of metal evaporating into the plasma of external gas. Expressions derived for density of electron and ion currents flowing to the metal surface and for distribution of potential in the multicomponent near-surface plasma (arc, laser or combined) are given.
Keywords: laser welding, arc welding, laser-arc (combined) welding, near-surface plasma, Knudsen layer, metal, surface, evaporation, investigations

References

1. Knight, Ch.J. (1979) Theoretical modeling of rapid surface vaporization with back pressure. A/AA J., S, 519 - 523.
2. Arutyunyan, R.V., Baranov, V.Yu., Bolshov, L.A. et al. (1989) Effect of laser radiation on materials. Moscow: Nauka.
3. Bejlis, 1.1., Lyubimov, G.A., Rakhovsky,. V.I. (1972) Diffusion model ol the near-cathode region of a high-current arc discharge. Doklady AN SSSR, 1, 71 - 74.
4. Zhukov, M.F., Kozlov, N.P., Pustogarov, A.V. et al. (1982) Near-electrode processes in arc discharges. Novosibirsk: Nauka.
5. Dyuzhev, G.A., Nemchinsky, V.A., Shkolnik, S.M. et al. (1983) Anode processes in the high-current arc discharge. Khimiya Plazmy, 10, 169 - 209.
6. Anisimov, S.I., Imas, Ya.A., Khodyko, G.S. et al. (1970) Effect of high-power radiation on metals. Moscow: Nauka.
7. Bejlis, 1.1. (1982) On the theory of erosion processes in the arc discharge cathode plasma. Doklady AN SSSR, 6, 1356 - 1361.
8. Bejlis, 1.1. (1986) Flow of the near-cathode arc plasma in the Knudsen laver. Teplofizika Vysokikh Temperatur, 3, 437 - 444.
9. Baksht, F.G., Dyuzhev, G.A., Mitrofanov, N.K. et al. (1973) Probe measurements of the low-temperature plasma at high degrees of ionization. Zhurnal Tekhn. Fiziki, 12, 2574 - 2583.
10. Zharinov, A.V., Sanochkin, Yu.V. (1983) Dynamics of heavy particles near the negatively charged wall in the dense ionized plasma. Fizika Plazmy, 2, 397 - 400.
11. Chen, F. (1967) Electrical probes. In: Diagnostics of plasma. Ed. by R. Iladdlstone, S. Leonard. Moscow: Mir.
12. Bohm, D. (1949) The characteristics of electrical discharge in magnetic fields. Ed. by A. Guthrie, R.K. Wakerling. New York: McGraw-Hill.
13. Landau, L.D., Lifshits, E.M. (1986) Hydrodynamics. Moscow: Nauka.
14. Granovsky, V.L. (1971) Electric current in gas. Established current. Moscow: Nauka.

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Suggested Citation

I.V. Krivtsun (2001) Model of evaporation of metal in arc, laser and laser-arc welding. The Paton Welding J., 03, 2-9.

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