Electric heating – Metal heating – By arc
Patent
1985-07-03
1986-12-02
Paschall, M. H.
Electric heating
Metal heating
By arc
219121PR, 219 75, 219121PP, B23K 1500
Patent
active
046266488
ABSTRACT:
A hybrid transferred-arc plasma torch system utilizes a transferred-arc plasma torch whose hollow body carries internally a cathode aligned with a relatively small diameter nozzle which functions under a created arc to issue an arc flame through the nozzle with a plasma gas applied to the chamber. An external anode electrically isolated from the cathode and the transferred-arc plasma torch body coaxial with the nozzle and spaced downstream thereof has an active anode surface of relatively large area radially remote from the axis of the arc flame issuing from the transferred-arc torch with the torch anode position such that the arc flame extends freely beyond the active anode surface with a reverse flow of electrons completing the circuit from the arc flame beyond the anode surface back to that anode surface.
REFERENCES:
patent: 3304774 (1967-02-01), Poole
patent: 3533756 (1970-10-01), Houseman
patent: 3536885 (1970-10-01), Mitchell
patent: 3770935 (1973-11-01), Tateno et al.
patent: 4125754 (1978-11-01), Wasseman et al.
patent: 4439657 (1984-03-01), Shimanovich et al.
Metals Handbook, "Welding & Brazing", Copyright 1971, pp. 138-139.
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