Operating characteristics and energy distribution in transferred plasma arc systems View Full Text


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Article Info

DATE

1982-12

AUTHORS

H. K. Choi, W. H. Gauvin

ABSTRACT

A specially designed plasma chamber was constructed to study the operating characteristics of a dc plasma-transferred arc of argon, struck between a fluid convective cathode and a water-cooled anode. The arc voltage increased markedly with arc length and with an increase in the inlet velocity of the argon flow past the cathode tip, and much less with an increase in current. Radiation from the plasma column to the chamber walls and transfer of energy to the anode were the two principal modes of transfer of the arc energy. The former was dominant in the case of long arcs and at high inlet argon velocities. At the anode, the major contribution was from electron transfer, which occurred on a very small area of the anode (∼5 mm in diameter). Convective heat transfer from the plasma was somewhat less. In all cases, the arc energy contributions to cathode cooling and to the exit gas enthalpy were small. From total heat flux and radiative heat transfer measurements, it was estimated that the plasma temperature just above the anode was in the range 10,000–12,000 K. Preliminary experiments with an anode consisting of molten copper showed that the arc root was no longer fixed but moved around continuously. The arc was othwewise quite stable, and its operating characteristics differed little from those reported for solid anodes, in spite of the greater extent of metal vaporization. More... »

PAGES

361-386

References to SciGraph publications

  • 1956-02. Zum Anodenmechanismus des thermischen Argonbogens in ZEITSCHRIFT FÜR PHYSIK
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    http://scigraph.springernature.com/pub.10.1007/bf00567563

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    http://dx.doi.org/10.1007/bf00567563

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