Microprocessor based arc-air and welder noise abatement controll

Details Microprocessor based arc-air and welder noise abatement controll Microprocessor based arc-air and welder noise abatement controll

1980-02-15

1982-03-16

Shaw, C. C.

Electric heating

Metal heating

By arc

21913033, 2191304, B23K 906

Patent

active

043202829

ABSTRACT:
Sudden changes in arc current are slowed to mitigate the resulting noise. A sensor detects large decreases in current during initial stages of arc quench and actuate circuits to maintain ionization and current flow to avoid sharp final drop that causes loud noise impulse. Ionization can be maintained by supplying RF energy at appropriate frequency to the arc electrodes and/or by increasing the arc voltage. The sophisticated control algorithm is implemented utilizing an inexpensive microprocessor to exert proper control of arc sustaining parameters to mitigate arc quenching impulse noise.

REFERENCES:
patent: 3904846 (1973-12-01), Risberg
patent: 4117303 (1978-09-01), Hedberg
patent: 4201906 (1980-05-01), Puschner

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