Arc ignition using DC discharges

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Abstract
The results are presented of a series of experimental and analytical investigations into the minimum requirements of a DC ignition source for non-contact arc ignition. Conditions for ignition are found—the starting discharge voltage should be less than the output voltage of the main source and it should exist for a time governed by the transient behaviour of the circuit and the discharge supplied by the two power sources during ignition. A design example shows that for a typical welding supply of 80 V output, the ignition source must have an output voltage of at least 4 kV and an output current of at least 0.5 A for at least 56 µs to initiate a 3 mm TIG welding arc.

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