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ISSN Imprimir: 1093-3611
ISSN On-line: 1940-4360
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DYNAMIC BEHAVIOUR OF A NITROGEN D.C. TRANSFERRED DOUBLE ARC
RESUMO
The dynamic behaviour of a double transferred arc is experimentally analysed. The arc chamber is equipped with four optical fibers aimed at the observation of arc space-time fluctuations. Terminal voltages and currents are also recorded. A particular low frequency behaviour of the arc is pointed out. It is characterized by erratic skips from rotating to quasi stable fastening on the primary nozzle-shaped anode. In either case the arc root looks rather evenly distributed than located in a definite position. The disappearing of the HF fluctuations when replacing the anode material by a better heat conductor material confirms the important stabilizating role played by the electrode cooling