Control circuit in plasma arc cutting and welding equipment designed for transferred arc operation
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United States of America Patent
Stats
-
Mar 21, 1989
Grant Date -
N/A
app pub date -
Feb 24, 1987
filing date -
Jun 26, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The circuit comprises a transformer and a rectifier, and is used in conjunction with a torch the electrode of which is wired to one of the output terminals of the rectifier; the nozzle is connected to the remaining terminal by way of a resistor. A comparator monitors passage of the power stage from stand-by to normal non-transferred arc operation, and triggers switch-in of the ground cable by way of which the work is connected to the relative terminal of the rectifier, only after an arc has first been struck between the electrode and the nozzle.
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