Wire electrical discharge machining (WEDM) is a non-conventional machining technology which uses electrical impulses between two electrodes to cut materials. The long-term trend of increasing accuracy and surface finish quality leads to the necessity of its detailed examination. The study deals with the evaluation of the surface morphology by electron microscopy (SEM) and chemical composition analysis (EDX). Object of interest was to assess the amount of adhering material from brass wire electrodes. Furthermore, it also examined surface and profile parameters of the machined surface. Samples for the experiment were made of X210Cr12, tool alloy steel for cold working, which was subject to 4 different types of heat treatment. Dependence between the amount of adherent material from the wire electrode and the the of machined material has been found.
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