Adjusting circuit for use in plasma arc cutting torch

Details Adjusting circuit for use in plasma arc cutting torch Adjusting circuit for use in plasma arc cutting torch

1976-10-07

1978-07-18

Truhe, J. V.

Electric heating

Metal heating

By arc

21912403, B23K 910

Patent

active

041017544

ABSTRACT:
An electrical height control circuit for controlling the height of a plasma arc cutting torch includes a differential amplifier which compares a torch height detector voltage with an adjustable reference voltage for setting the torch height. In accordance with the invention an adjusting circuit is provided for changing the reference voltage to compensate for changes in the detector voltage caused by water or other material on the work piece to insure that the torch is maintained at the desired height above the work piece.

REFERENCES:
patent: 2747152 (1956-05-01), Greene
patent: 3398342 (1968-08-01), Redman
patent: 3809308 (1974-05-01), Roeder et al.

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