What does EDM mainly use to remove materials?

Dissolve; Oxidation. According to relevant published data, when the voltage between the electrode and the workpiece reaches a certain value, an arc discharge will be formed between them, and the high temperature and high pressure generated by the arc discharge can partially melt or even volatilize the material on the surface of the workpiece, thus realizing material removal; Arc discharge will also dissociate gas molecules into free atoms and free ions, in which oxygen atoms can combine with metal elements on the surface of the workpiece to form oxides, which will impact the surface of the material in the form of solid particles, thus realizing the removal of materials.