Electric heating – Metal heating – By arc
Patent
1995-10-30
1997-04-15
Paschall, Mark H.
Electric heating
Metal heating
By arc
21912139, 21912144, 21912157, B23K 1000
Patent
active
056206178
ABSTRACT:
An arc control circuit in a plasma arc torch, having an electrode and a nozzle, maintains a plasma arc during operation of the torch. The circuit includes a power supply electrically coupled to the electrode, nozzle and a workpiece. A logic device opens a power switch electrically coupling the nozzle to the power supply, disconnecting the nozzle from the supply, when a transferred arc is formed between the electrode and the workpiece. An amplifier is electrically connected to the power supply. The amplifier compares a sensed current to an operating current. The amplifier increases the output voltage of a power supply to maintain the operating current in coordination with an increasing distance between the workpiece and the torch. A comparator is electrically connected to a logic device and compares the output voltage of the power supply to a maximum voltage. When the output voltage of the power supply exceeds the maximum voltage, the comparator sets the logic device. The logic device generates an output signal to close the power switch and reconnect the nozzle to the power supply, thereby initiating switching of the arc from the workpiece to the nozzle.
REFERENCES:
patent: 3447322 (1969-06-01), Mastrup
patent: 3558973 (1971-01-01), Pochert et al.
patent: 3770935 (1973-11-01), Tateno et al.
patent: 4275287 (1981-06-01), Hiratake
patent: 4280042 (1981-07-01), Berger et al.
patent: 4463245 (1984-07-01), McNeil
patent: 4626648 (1986-12-01), Browning
patent: 4692582 (1987-09-01), Marhic
patent: 4795882 (1989-01-01), Hardwick et al.
patent: 4814577 (1989-03-01), Dallavalle et al.
patent: 4839499 (1989-06-01), Kotecki et al.
patent: 4916599 (1990-04-01), Traxler
patent: 4996407 (1991-02-01), Traxler
patent: 5017752 (1991-05-01), Severance, Jr. et al.
patent: 5111024 (1992-05-01), Patron et al.
patent: 5170030 (1992-12-01), Solley et al.
patent: 5225658 (1993-07-01), Yamaguchi et al.
patent: 5296655 (1994-03-01), Peterson et al.
patent: 5326955 (1994-07-01), Nishi et al.
patent: 5416297 (1995-05-01), Luo et al.
patent: 5506384 (1996-04-01), Yamaguchi
Borowy Dennis M.
Peterson Jeffrey L.
Hypertherm, Inc.
Paschall Mark H.
LandOfFree
Circuitry and method for maintaining a plasma arc during operati does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuitry and method for maintaining a plasma arc during operati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuitry and method for maintaining a plasma arc during operati will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-358271