Electrical discharge machining (EDM) is precision method of manufacturing complex shape with conductive materials, which is widely used in aerospace, automotive and mold making industries. In EDM material is removing with the series discharges occurring in the gap between two electrodes. Resulting of thermal removal process are specific properties of surface roughness, metallurgical transformations and micro-cracking. This paper is considered on influence of electrical discharge energy on surface integrity. Properties of surface texture and microstructure of tool steel 1.2713 after EDM was described. The experiments were conducted using copper electrode while varying discharge current, pulse duration and pulse interval. Observations of metallographic structure show that discharge energy have a strong influence on thickness of recast layer and heat effect zone. The effect of the parameters of EDM process on surface integrity was described and discussed.Keywords: Electrical discharge machining, EDM, surface roughness, discharge energy, metallographic structure
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