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AssigneePlasma Laser Technologies Ltd.
InventorsGeorgy Ignatchenko, Evgeny Bogachenkov, Igor Dykhno
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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.
A method of igniting a welding arc of an arc welding apparatus by a high voltage discharge between a welding electrode and a workpiece, the method comprising the steps of:
A welding arc ignition device for an arc DC-welding apparatus by a high voltage discharge between a welding electrode and a workpiece, the device comprising a first high voltage pulse power source for generating a short, high voltage pulse and a second high voltage power source for generating a long, high voltage pulse, an outlet of said first high voltage pulse power source being connected with a primary winding of a transformer, whereas said transformer's secondary winding is connected in series with a circuit of a welding power source, said second high voltage power source, being connected in parallel with said circuit of said welding power source, said first high voltage pulse power source being provided with an operation synchronizer, an inlet thereof being connected with an outlet of said second high voltage pulse power source.
A welding arc ignition and stabilization device for an arc AC-welding apparatus by a high voltage discharge between a welding electrode and a workpiece, the device comprising a first high voltage pulse power source for generating short high voltage pulses, an outlet of said power source being connected with a primary winding of a transformer, and a secondary winding of said transformer is connected in series with a circuit of a welding power source, and a second high voltage power source connected in parallel with said circuit of said welding power source and being designed for generating long high voltage pulses, and an operation synchronizer, an inlet of said synchronizer being connected with an outlet of said second high voltage pulse power source.
Dependencies are inferred from the claim text.