Electric heating – Metal heating – By arc
Patent
1994-08-19
1995-09-19
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912152, 21912148, 219119, 21912149, 31323121, B23K 1000
Patent
active
054517397
ABSTRACT:
An electrode and method of operating a plasma arc torch is provided which extends the useful service life of the torch. The electrode includes an elongate tubular holder defining a longitudinal axis and having a discharge end. An endwall closes the discharge end and includes an emissive insert. In one embodiment, the endwall also includes an annular sleeve which separates the insert from physical contact with the holder. Channels formed in the discharge end of the electrode direct a portion of a swirling vortex of gas across the surface of the endwall. The swirling vortex of gas removes products of erosion of the insert and adjacent portion of the sleeve such that the likelihood that arcing will transfer from the insert to the sleeve and/or holder is reduced, and the useful service life of the nozzle-electrode pair is thereby extended.
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patent: 3450926 (1969-06-01), Kiernan
patent: 3562486 (1971-02-01), Hatch
patent: 4782210 (1988-11-01), Nelson et al.
patent: 4902871 (1990-02-01), Sanders et al.
patent: 5023425 (1991-06-01), Severance, Jr.
patent: 5124525 (1992-06-01), Severance, Jr. et al.
patent: 5296668 (1994-03-01), Foreman et al.
Lynch Rue A.
Nemchinsky Valerian
Esab Group, Inc.
Paschall Mark H.
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