Plasma arc torch ignition method

Details Plasma arc torch ignition method Plasma arc torch ignition method

B - Operations, Transporting

23

K

B23K 10/00 (2006.01) B23K 9/067 (2006.01) H05H 1/36 (2006.01)

Patent

CA 2136202

A high frequency, high voltage starting circuit (10) for a plasma arc cutting torch (16) is operated in pulses to restart the torch if an initial arc extinguishes before the arc transfers to the workpiece (24). The starting circuit (1) includes a D.C. power supply (28) with its negative output (28A) connected to an electrode (18) of the torch (16). A positive output (29b) is connected to a nozzle (22), and at a higher positive voltage, to a workpiece (24). A surge injector circuit (38) of a resistor (R2) and surge capaci- tor (C4) is connected in parallel with the power supply to supply current to the arc as soon as breakdown occurs. The duration of the interval between restart pulses is sufficient to allow the surge injector circuit (38) to recharge to a value that will reliably restart the arc as the power supply ramps up to a steady state pilot arc current.

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