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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v15.i4.100
pages 329-335

COLD ELECTRODE EROSION MODEL FOR UNSTEADY ARC SPOTS

L. I. Sharakhovsky
Instituto de Fisica "Gleb Wataghin", Universidade Estadual de Campinas, Unicamp, 13083-970, Campinas, Sao Paulo, Brazil; The Luikov Heat & Mass Transfer Institute, P. Brovki street, 15, 220072, Minsk, Republic of Belarus
A. Marotta
Institute of Physics, University of Campinas, UNICAMP, SP, Brazil
V. I. Krylovich
The Luikov Heat & Mass Transfer Institute P. Brovki street, 15-220072, Minsk, Rep. Belarus
V. N. Borisyuk
The Luikov Heat & Mass Transfer Institute P. Brovki street, 15-220072, Minsk, Rep. Belarus
A. M. Essiptchouk
Instituto de Fisica "Gleb Wataghin", Universidade Estadual de Campinas, Unicamp, 13083-970, Campinas, Sao Paulo, Brazil; The Luikov Heat & Mass Transfer Institute, P. Brovki street, 15, 220072, Minsk, Republic of Belarus

RÉSUMÉ

The step-wise model of displacement of the arc spot in cold electrode arc heaters is considered in this report. We have shown theoretically that the nature of the motion of the arc spot substantially influences the erosion: the step-wise motion of the spot leads to the increase in the erosion in comparison with the continuous motion, the greater it is, the greater the length of the arc step. We compared both models to the same experimental results for copper cathode in air. The step-wise model shows somewhat better agreement to our experimental erosion data, than the continuous one. In order to access the validity of the step-wise model we used results for electric discharge machining experiments. A good agreement was also obtained.

RÉFÉRENCES

  1. Marotta, A. and Sharakhovsky, L. I. , A theoretical and experimental investigation of copper electrode erosion in electric arc heaters. I: The thermophysical model.

  2. Sharakhovsky, L. I., Marotta, A., and Borisyuk, V. N. , A theoretical and experimental investigation of copper electrode erosion in electric arc heaters, III: Experimental validation and prediction of erosion.

  3. Sharakhovsky, L. I., Marotta, A., and Borisyuk, V. N. , A theoretical and experimental investigation of copper electrode erosion in electric arc heaters, II: Experimental determination of arc spot parameters.

  4. DiBitonto, D. D., Eubank, P. T., Patel, M. R., and Barrufet, M. A. , Theoretical models of the electrical discharge machining process, I. A simple cathode erosion model.