Electric heating – Metal heating – By arc
Patent
1983-07-20
1986-04-29
Albritton, C. L.
Electric heating
Metal heating
By arc
219121PP, 219121PW, B23K 900
Patent
active
045859213
ABSTRACT:
The present invention minimizes shock hazard in using a touch start plasma torch. The resistance between the torch tip and the workpiece is compared to a predetermined value set by estimating the resistance between a person's hand to ground under the most unfavorable conditions. In the preferred embodiment, such comparison is performed by supplying an AC voltage to a resistor in series with a torch tip, the resistor having a resistance equal to the predetermined value. The peak voltage at a point in the circuit connection between the resistor and torch tip is sensed and if such peak is less than half of the peak voltage of the AC voltage supplied to the resistor and torch tip, the resistance between the torch tip and ground is less than the predetermined value and a control signal will be generated. A relay will switch on the power supply supplying high voltage between the cathode and the workpiece only when it receives the control signal indicating that the resistance between the torch tip and ground is below the predetermined value.
REFERENCES:
patent: 2617913 (1952-11-01), Oestreicher
patent: 3558973 (1971-01-01), Pochert et al.
patent: 4100390 (1978-07-01), Jackson
patent: 4151396 (1979-04-01), Veal
patent: 4330700 (1982-05-01), Jagieniak et al.
AES Brochure.
Eugotral Brochure.
AES Price List.
Instruction Manual, Pak 3 Cutting System, Thermal Dynamics Corporation.
Sales Literature, Thermal Arc Pak 3, Plasma Cutting System, Thermal Dynamics Corporation.
Hatch Bruce O.
Wilkins Raymond G.
Albritton C. L.
Lateef M. M.
Thermal Dynamics Corporation
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