Method and circuit for contactless ignition of a welding arc...

Electric heating – Metal heating – By arc

Reexamination Certificate

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Details

C219S130510, C219S121570

Reexamination Certificate

active

07638734

ABSTRACT:
The invention relates to a method for the contactless ignition of a welding arc, in addition to a circuit (28) for the contactless ignition of an electric arc, comprising a charging circuit (31), at least one pulse capacitor (30), a decharging circuit containing a circuit, and a high tension converter (32) which is used to inject the high frequency ignition pulses discharged by the pulse capacitor (30) via the circuit to the welding electrode (27). In order to create said type of ignition method and an ignition circuit (28) which enables the welding arc to be ignited in an exact and/or safe and rapid manner and/or to create an improved ignition quality, the charge circuit (31) is connected to a pulse compression circuit (40) comprising the pulse capacitor (30), the high tension converter (32) and the circuit, the circuit being formed by a magnetic throttle valve (41), such that a high frequency circuit of the ignition pulse can be obtained.

REFERENCES:
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patent: 3376470 (1968-04-01), Stone et al.
patent: 3657512 (1972-04-01), Bodarenko
patent: 4767912 (1988-08-01), Eldridge
patent: 4870248 (1989-09-01), Gilliland
patent: 5117088 (1992-05-01), Stava
patent: 5406052 (1995-04-01), Mizuno et al.
patent: 5965038 (1999-10-01), Nomura et al.
patent: 33 42 932 (1985-06-01), None
patent: 195 07 649 (1995-09-01), None
patent: 1 197 285 (2002-01-01), None
patent: 947 276 (2002-01-01), None
patent: 1 225 054 (1971-03-01), None
patent: 04 305374 (1993-03-01), None

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