Research conducted in many scientific centers on the operational properties of machine parts has shown that one of the critical components affecting the fatigue strength of parts is the condition of the surface integrity of their ingredients. In the case of elements produced by electrical discharge machining, the processes occurring during removal of the material: thermal and chemical, constitute the surface layer with different properties to the bulk material. In the paper presents results of experimental investigation of influence EDM process parameters on surface layers properties. The research was conducted using graphite electrode with varying discharge current, pulse duration, pulse interval. Furthermore, the mathematical model was established to estimate the influence of EDM parameters on surface roughness.Keywords: Electrical discharge machining, surface roughness, micro-cracks
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