Switch closed, electricity flows from DC-power source to electrodeDC-power sourceLonized column of dielectric fluidNegative electrode polarityElectrons flow from negative to positiveDielectric fluidWorkpiece positive polarityFigure 3-12. Spark-electron flow sith negative electrode polarity.Lonized column of dielectric fluidElectrodeNegative polarity.Dielectric fluidPositive polarity.WorkpieceElectrons bombard workpiece surfaceElectrons travel at the speed of light through ionized columnFigure 3-13. Electrons bombard workpiece surface.
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