Electrode for a plasma arc torch

Details Electrode for a plasma arc torch Electrode for a plasma arc torch

1994-07-29

1995-11-07

Paschall, Mark H.

Electric heating

Metal heating

By arc

219119, 21912148, 21912149, B23K 1000

Patent

active

054649625

ABSTRACT:
An insert securely disposed in a bottom end of an electrode has an exposed emission surface shaped to define a recess in the insert, wherein the recess is initially dimensioned as a function of the operating current level of the torch, the diameter of the insert, and the plasma gas flow pattern in the torch. The electrode has an elongated body formed of a high thermal conductivity material such as copper, and a bore disposed in the bottom end of the body along a central axis. The insert is formed of a high thermionic emissivity material, such as hafnium, and securely disposed in the bore with the emission surface exposed. The emission surface may be initially shaped by removing a predetermined amount of the high thermionic emissivity material from the insert to define a generally concave recess, a generally cylindrical recess or other shapes. When used in a torch, the electrode provides for reduced deposition of the high thermionic emissivity material on the nozzle, thereby reducing nozzle wear in the torch.

REFERENCES:
patent: 3592994 (1971-07-01), Ford
patent: 3676639 (1972-07-01), Esiban et al.
patent: 3930139 (1975-12-01), Bykhovsky et al.
patent: 4133987 (1979-01-01), Lakomsky et al.
patent: 4521666 (1985-06-01), Severance, Jr. et al.
patent: 4701590 (1987-10-01), Hatch
patent: 4766349 (1988-08-01), Johansson et al.
patent: 4782210 (1988-11-01), Nelson et al.
patent: 5097111 (1992-03-01), Severance, Jr.
patent: 5105061 (1992-04-01), Blankenship

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