However, for a given pulse duration (350s), more discharge points on the base material, corresponding to a higher discharge density yields more molten metal at the discharge points. Thus, more molten metal was flushed away near the discharge points due to the increased discharge impact and the effect of machining liquid air explosion, increasing MRR. Notably, the duration of the single spark effect is extended with increased pulse duration. Consequently, the area of the discharge points is also increased, with the thickness of the resulting rapidly resolidified layers, because the re-solidified layer included almost no silicon particles.