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Verfahren und Vorrichtung zur Modifizierung von metallischen Werkstueckoberflaechen durch elektrische Entladungen

Modification of metal workpiece surfaces by electric discharges - with pulsed electric arc discharge taking place between an electrode and the workpiece without macroscopic melting of the workpiece surface taking place.
 
: Siemroth, P.; Schultrich, B.; Kleinert, H.; Grosser, S.

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Frontpage ()

DE 1996-19637513 A: 19960913
DE 1996-19637513 A: 19960913
EP 1997-115334 A: 19970904
EP 829553 A: 19980318
DE 19637513 C2: 20010607
B23H0001
C22F0003
German
Patent, Electronic Publication
Fraunhofer IWS ()

Abstract
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.

: http://publica.fraunhofer.de/documents/PX-38706.html