Verfahren und Vorrichtung zur Modifizierung von metallischen Werkstueckoberflaechen durch elektrische Entladungen

Modifying metal workpiece surfaces by electric discharges as preparation for subsequent operations comprises a) pulsed unipolar electric arc discharge is ignited and maintained between an electrode serving as an anode and the workpiece taking the role of a cathode; b) the duration of individual discharge pulses is such that no macroscopic melting of the workpiece surface takes place and; c) the number and frequency of discharge pulses are such that no macroscopic melting of the surface takes place and full extinction of individual discharge pulses is ensured. Also claimed (below) is an apparatus for implementation of the proposed method. USE - For preparation of workpiece surfaces for subsequent operations such as, for example, joining by various processes. ADVANTAGE - Need for multistage modification processes is eliminated. Surfaces can be prepared without use of substances which pollute the environment and/or are harmful to health.