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Scanning Electron Microscopy SEM! has been a common tool to examine EDM surfaces @4,7#. The EDM surface consists of small craters created by electrical sparks @1#.To improve the EDM surface integrity,the size of craters needs to be small. This study uses the SEM to examine and estimate the sizes of craters.Subsurface depths of the recast layer and heat-affected zone are two
other important characteristics of the EDM surface integrity.
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