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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Imprimer: 1093-3611
ISSN En ligne: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v4.i4.40
14 pages

AN EXPERIMENTAL STUDY OF THE ELECTRIC ARC DURING VACUUM ARC REMELTING

P. Chapelle
Ecole des Mines de Nancy, LSG2M UMR 7584, Pare de Saurupt, 54042 Nancy cedex, France
J.P. Bellot
Ecole des Mines de Nancy, LSG2M UMR 7584, Pare de Saurupt, 54042 Nancy cedex, France
A. Jardy
Ecole des Mines de Nancy, LSG2M UMR 7584, Pare de Saurupt, 54042 Nancy cedex, France
T. Czerwiec
Ecole des Mines de Nancy, LSGS UMR CNRS-EDF 7570, Pare de Saurupt, 54042 Nancy cedex, France
X. Robbe
Centre de Recherches de la Compagnie Europeenne du Zirconium CEZUS 73403 Ugine cedex, France
B. Champin
Centre de Recherches de la Compagnie Europeenne du Zirconium CEZUS 73403 Ugine cedex, France
D. Ablitzer
Ecole des Mines de Nancy, LSG2M UMR 7584, Pare de Saurupt, 54042 Nancy cedex, France

RÉSUMÉ

An industrial vacuum arc remelting (VAR) furnace has been instrumented, enabling the electric arc to be observed for the first time during the remelting of a zirconium alloy. The system employed combined high speed video monitoring with synchronized high frequency recording of the arc voltage and was used to study the arc behavior and the mechanisms of liquid metal transfer from the electrode to the ingot. For current densities of the order of 10 to 20 A/cm2 and arc lengths less than 6 cm, the arc is of the diffuse multicathode spot type. The metal droplet transfer mechanisms depend mainly on the arc length. For small lengths, transfer is very often preceded by a drip-short, causing transitory extinction of the arc. For long arcs (> 3 cm), transfer is mainly by gradual erosion of the liquid induced by the cathode spots.