Electric heating – Metal heating – By arc
Patent
1990-07-13
1992-01-21
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912148, 21912157, 2191215, 219 75, B23K 900
Patent
active
050830058
ABSTRACT:
The support for the electrode has at its end a cavity at the bottom of which there is an emissive insert made of zirconium of hafnium. A portion of the support end around the insert has at least a portion of an electroconductive material axially projecting with respect to the insert. Application to plasma cutting torches ignition by short-circuit.
REFERENCES:
patent: 3930139 (1975-12-01), Bykhovsky et al.
patent: 4567346 (1986-01-01), Marhic
patent: 4766349 (1988-08-01), Johansson et al.
patent: 4769524 (1988-09-01), Hardwick
patent: 4810851 (1989-03-01), Fridlyand
patent: 4864097 (1989-09-01), Wallner
"Effect of Methods of Producing Thermochemical Electrodes on Their Service Life in Welding Plasma Torches", Welding International, vol. 2, No. 10, 1988, By D. Dudko et al., pp. 870-873.
"Evaluating the Life of Non-Consumable Electrodes in the Arc Welding of Aluminium Alloys", Welding International, vol. 1, No. 9, 1987, by S. Poloskov et al., pp. 816-820.
L'Air Liquide Societe Anonyme Pour l'Etude et, l'Exploitation de
Paschall Mark H.
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