Thermal torch height acquisition circuit

Details Thermal torch height acquisition circuit Thermal torch height acquisition circuit

1978-05-19

1979-10-09

Tolin, Gerald P.

Electric heating

Metal heating

By arc

21912403, B23K 910

Patent

active

041707273

ABSTRACT:
A plasma torch circuit includes a control for initially setting the torch at a desired height above a workpiece during the time the non-transferred arc exists between the torch cathode and the torch tip. Measurement is made of the voltage between the cathode and the workpiece, and that voltage is compared to an input for controlling torch height. During transferred arc operation, a reference is initially created by storing the cathode-to-workpiece voltage occurring immediately after the transferred arc is turned on, and using the latter stored voltage as a reference for torch height maintenance.

REFERENCES:
patent: 2832000 (1958-04-01), Steele
patent: 3596050 (1971-07-01), Tikijian
patent: 3809308 (1974-05-01), Roeder et al.
patent: 3989921 (1976-11-01), Ohi et al.
patent: 4017707 (1977-04-01), Brown et al.

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