Single-spark analysis of removal phenomenon in magnetic field assisted dry EDM

P. Govindan, A. Gupta, Suhas S. Joshi, Ajay Malshe, K. P. Rajurkar

Research output: Contribution to journalJournal articleResearchpeer-review


The increased MRR in magnetic field assisted dry EDM (by similar to 130%) was attributed to several reasons including confinement of plasma due to Lorentz forces. The conjectures were investigated further by undertaking over 100 single-discharge, dry and liquid EDM trials, with and without magnetic fields, by varying current, voltage, magnetic field, pulse on-time and bi-pulse current. The magnetic field assistance increased the depth and reduced crater diameter by 80% in dry EDM; and reduced crater diameter marginally but significantly improved uniformity in the material erosion, in liquid EDM. The role of Lorentz forces in confining plasma and reduction in electron mean free path due to magnetic field, when modeled analytically, captured the experimental trends very well. (C) 2013 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalJournal of Materials Processing Technology
Pages (from-to)1048-1058
Publication statusPublished - 2013
Externally publishedYes


  • Crater radius
  • Dry EDM
  • Magnetic field
  • Single-discharge


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