Stopping a plasma arc cutter upon completion of cutting

Details Stopping a plasma arc cutter upon completion of cutting Stopping a plasma arc cutter upon completion of cutting

1991-05-09

1993-07-06

Paschall, Mark H.

Electric heating

Metal heating

By arc

21912154, 21912139, 2191241, 21913031, B23K 906

Patent

active

052256588

ABSTRACT:
In a plasma arc cutter and a method of controlling the same, a rise compensating circuit (39) and a shift compensating circuit (44) both composed of a charging and discharging capacitor and a resistor are respectively inserted in parallel between an electrode-side connection (21) and a nozzle-side connection (35) and between the electrode-side connection (21) and a workpiece-side connection (34), and a diode (33) is provided on the workpiece-side connection in such a manner as to be inserted between a connecting point (36) of the nozzle-side connection and a connecting point (43) of the shift compensating circuit. A detector (31) for controlling a current is provided and a detector (32) for detecting a shift is provided on the workpiece-side connection. In addition, to effect cutting after boring, at least one plasma torch (14a) for boring and at least one plasma torch (14b) for cutting are provided. Furthermore, the voltage between an electrode (14) and a workpiece (17) or between a nozzle (15) and the workpiece (17) is detected, and the power source is stopped when that voltage exceeds a predetermined value.

REFERENCES:
patent: 4017707 (1977-04-01), Brown et al.
patent: 4766286 (1988-08-01), Iceland
patent: 4839499 (1989-06-01), Kotecki et al.
patent: 4996407 (1991-02-01), Traxler

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