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Erosion of the Cold Electrode as an Ablation Process in Unsteady Arc Spots a
Author(s) -
MAROTTA ARUY,
SHARAKHOVSKY LEONID I.,
ESSIPTCHOUK ALEXEI M.
Publication year - 1999
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1999.tb08749.x
Subject(s) - electrode , arc (geometry) , erosion , materials science , thermal conduction , mechanics , coaxial , cathode , electric arc , composite material , chemistry , mechanical engineering , geology , physics , paleontology , engineering
A simple macroscopic thermophysical model is presented for cold electrode erosion in unsteady arc spots. The model is based on the consideration of erosion as heat ablation characterized by an effective enthalpy of erosion of the electrode material. The unbalance between the arc spot heat supply and the heat removal by conduction into the electrode body provides the heat spent in the erosion process. Two modes of displacement of the arc spot are considered: continuous and step‐wise. An experimental coaxial setup with a magnetically driven arc has been used for conducting erosion measurements in copper cathodes. Good agreement between this experiment and those reported by other researchers has been obtained with the continuous and the step‐wise models. Electrical Discharge Machining experimental data in steel cathodes have also shown good agreement with our step‐wise erosion model.