Electric heating – Metal heating – By arc
Patent
1998-12-28
2000-12-05
Shaw, Clifford C.
Electric heating
Metal heating
By arc
B23K 9067
Patent
active
061569992
ABSTRACT:
Method and device for welding arc ignition of an arc welding apparatus providing a reduced level of high frequency disturbances. A welding electrode and a workpiece are connected with a welding power source and to at least two additional high voltage power sources. A short a periodic high voltage pulse is transmitted from the first high voltage power source to a gap present between the welding electrode and the workpiece, to break down the air present between the welding electrode and the workpiece, and to create a current conducting duct therebetween. The current output of the high voltage power source is restricted in amplitude and rate of rise. The short non-periodic high voltage pulse is superimposed by another, long, high voltage pulse from the second high voltage power source. The long pulse has a current rate of rise not exceeding that of the short pulse, and the open circuit voltage of the second high voltage power source is lower than that of the first high voltage power source. A stretched pulse appears, and the duration of the current discharge increases. The current conducting duct is heated, its electric resistance decreases and an arc is ignited. When the voltage in the current conducting duct decreases to a value less than that of the open circuit of the welding power source, the current starts flowing through the welding electrode and arc to the workpiece, resulting in a welding arc burning from the welding power source.
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Bogachenkov Evgeny
Dykhno Igor
Ignatchenko Georgy
Friedman Mark M.
Plasma-Laser Technologies Ltd.
Shaw Clifford C.
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