Electric heating – Metal heating – By arc
Patent
1976-03-08
1979-01-09
Truhe, J. V.
Electric heating
Metal heating
By arc
21913001, 219 74, B23K 916
Patent
active
041339886
ABSTRACT:
To control the plasma arc in accordance with the present invention, the pressure change characteristics or curve in a torch is determined from the moment a plasma forming gas is delivered thereto until this plasma forming gas reaches the pressure in the supply manifold. Such a measurement is done for each selected cutting condition characterized by a constant flow rate of the plasma forming gas. The arc supply current is then fed in two stages: at first by a jump to a current amounting to approximately half the cutting current for a selected condition and then by gradually increasing the current in compliance with the pressure change characteristics or curve until the cutting current value is attained. Also described is a device to realize the method, comprising a torch pressure sensor, a means for shutting off the torch nozzle, a memory unit registering the signals of the pressure sensor and a rectifier regulator control means which controls the regulator in accordance with the sensor signals recorded in the memory unit.
REFERENCES:
patent: 3319042 (1967-05-01), Thostrup et al.
patent: 3471674 (1969-10-01), Gage
patent: 3581051 (1971-05-01), Brown
patent: 3792225 (1974-02-01), Needham
patent: 3811027 (1974-05-01), Strahan
patent: 3988566 (1976-10-01), Vogts et al.
Asoyants Grigory B.
Danchenko Mikhail E.
Dotsenko Vsevolod D.
Esibyan Eduard M.
Malkin Vasily B.
Paschall M.
Truhe J. V.
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