Electric heating – Metal heating – By arc
Patent
1980-01-22
1981-07-21
Rubinson, Gene Z.
Electric heating
Metal heating
By arc
219121PV, 219121PW, 21912402, 219137R, 266 76, B23K 910
Patent
active
042800420
ABSTRACT:
The invention relates to a plasma cutting plant comprising a principal generator feeding a plasma arc between a workpiece and an electrode of a torch comprising a tube, with initial ignition by means of an ignition or striking arc between the electrode and the tube, via the resistor and the contactor. A circuit comprising a resistor and an excitation coil of a relay is installed across the terminals of the contactor. When the torch has been brought to the correct distance from the workpiece, the circuit detects this correct spacing and acts on the feed motor to stop the latter immediately.
REFERENCES:
patent: 3513281 (1970-05-01), Haase et al.
patent: 3774007 (1973-11-01), Chiasson et al.
patent: 4017707 (1977-04-01), Brown et al.
patent: 4156125 (1979-05-01), Brown
patent: 4170727 (1979-10-01), Wilkins
patent: 4203022 (1980-05-01), Couch, Jr. et al.
Berger Jean-Yves
Egee Raymond
Kostelitz Michel
Reynaud Bernard
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
La Soudure Autogene Francaise
Paschall Mark H.
Robinson, Jr. Lee C.
Rubinson Gene Z.
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