Electrode for high current density plasma arc torch

Details Electrode for high current density plasma arc torch Electrode for high current density plasma arc torch

1992-05-20

1994-05-10

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912149, 21912139, 219119, 219120, B23K 1000

Patent

active

053109880

ABSTRACT:
The diameter of a hafnium insert press fit into the bottom end of a copper electrode varies as a function of the level of current carried by the electrode. The diameter is the minimum necessary to support emission at that current level while also protecting the copper body against attack by the arc. The insert is generally circular and preferably extends completely through the bottom wall to a circulating flow of cooling water at a hollow interior of the electrode. The bottom wall includes an annular recess in a portion of the copper wall surrounding the insert. A coolant inlet tube extends into the recess in a spaced relationship to provide a high flow velocity of the coolant over the interior rear surface of the electrode.

REFERENCES:
patent: 3930139 (1975-12-01), Bykhovsky et al.
patent: 4133987 (1979-01-01), Lakomsky et al.
patent: 4766349 (1988-08-01), Johansson et al.
patent: 4861962 (1989-08-01), Sanders et al.
patent: 4967055 (1990-10-01), Raney et al.
patent: 5070227 (1991-12-01), Luo et al.
patent: 5097111 (1992-03-01), Severance, Jr.
patent: 5105061 (1992-04-01), Blankenship

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