Electrode for a plasma arc torch having an improved insert...

H - Electricity – 05 – H

Patent

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H05H 1/34 (2006.01)

Patent

CA 2338277

An electrode for use in a plasma arc torch has an insert designed to improve the service life of the electrode, particu-larly for high current processes. The electrode comprises an elongated electrode body formed of a high thermal conductivity material and having a bore disposed in a bottom end of the electrode body. The bore can be cylindrical or ring-shaped. An insert comprising a high thermionic emissivity material, and in some embodiments, a high thermal conductivity mate-rial, is disposed in the bore. The insert can be ringed-shaped or cylindrical.

L'invention concerne une électrode pour chalumeau à arc de plasma dotée d'une pièce insérée conçue pour améliorer la durée d'utilisation de cette électrode, en particulier eu égard aux opérations conduites sous courant élevé. L'électrode comprend un corps allongé en matériau à forte conductivité thermique qui, sur une extrémité inférieure, présente un trou de forme cylindrique ou en forme d'anneau. Une pièce insérée renfermant un matériau à forte émissivité thermionique et, dans certaines variantes, renfermant un matériau à forte conductivité thermique, est placée dans le trou. Cette pièce peut être en forme d'anneau ou de forme cylindrique.

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