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- W561249070 abstract "Non-contact ignition of TIG welding arcs has been studied.The variation of dc voltage with dc current of combined acdcdischarges indicated that an ac-dominated discharge, adc-dominated discharge and a transition region exist duringthe initial current rise after breakdown from cold. Thesemeasurements enabled the conditions for reliable ignitionof dc arcs using a continuous sinusoidal hf source to bepredicted.The minimum current to sustain a cold arc and the timetaken to reach the steady-state were investigated using anovel capacitor discharge supply. The results showed thatto initiate a3 mm TIG welding arc from cold supplied by apower supply with an open circuit voltage of 80 V, aminimum current of about 0.9 A may be required and the timetaken for the arc to reach the steady-state may takeseveral hundred milliseconds. The results of investigations on combined ac-dc discharges,minimum current to sustain a cold arc and the time taken toreach the steady-state indicated that for safe,interference-free and reliable non-contact arc ignition, acontinuous sinusoidal hf supply was the best method. A highvoltage (about 3 kV) and high current (about 1 A) wererequired simultaneously to initiate a3 mm TIG arc fromcold. A single continuous sinusoidal hf supply required anignition power of the order of 1.35 kW which was notfeasible.An arc ignition method using two continuous sinusoidal hfsupplies has been devised which provides safe,interference-free and reliable arc ignition, and whichrequires less than 75% of the output power of a singlecontinuous sinusoidal hf system. A solid-state hf ignitionsystem based on the new method was designed andconstructed." @default.
- W561249070 created "2016-06-24" @default.
- W561249070 creator A5046629200 @default.
- W561249070 date "1991-01-01" @default.
- W561249070 modified "2023-09-26" @default.
- W561249070 title "Investigation of parameters affecting the ignition of arc discharges and the development of a high frequency ignition supply" @default.
- W561249070 hasPublicationYear "1991" @default.
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