Plasma gun with adjustable cathode

Details Plasma gun with adjustable cathode Plasma gun with adjustable cathode

1987-03-05

1988-10-25

Paschall, M. H.

Electric heating

Metal heating

By arc

21912403, 21912151, 2191215, 21912148, 31323151, B23K 900

Patent

active

047805919

ABSTRACT:
A plasma generating system comprises a plasma gun including a hollow cylindrical anode member, a hollow cylindrical intermediate member electrically isolated from and juxtaposed coaxially with the anode member to form a plasma-forming gas passage through the intermediate member and the anode member, and an axially movable cathode member. The intermediate member comprises tubular segments separated by resilient insulating spacing rings held in compression. Arc radiation is blocked from the spacer rings by meanders in the inter-segment slots and further by ceramic barrier rings. An electric motor or pneumatic piston responsive to a measurement of arc voltage continually adjusts the axial position of the cathode tip relative to the anode nozzle so as to maintain a predetermined arc voltage.

REFERENCES:
patent: Re25088 (1961-11-01), Ducati et al.
patent: 2943182 (1960-06-01), Prout et al.
patent: 3242305 (1966-03-01), Kane et al.
patent: 3318793 (1967-05-01), Webb
patent: 3513281 (1970-05-01), Haase et al.
patent: 3953705 (1976-04-01), Painter
patent: 4170727 (1979-10-01), Wilkins
patent: 4531043 (1985-07-01), Zverina et al.
patent: 4598191 (1986-07-01), Mashic et al.

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