Fronius International Gmbh

Gerald Hieslmair

Walter Stieglbauer

Andreas Prinz

Walter Pammer

Uwe Kroiss

The invention relates to a method for the contactless ignition of a welding arc, in addition to a circuit () for the contactless ignition of an electric arc, comprising a charging circuit (), at least one pulse capacitor (), a decharging circuit containing a circuit, and a high tension converter () which is used to inject the high frequency ignition pulses discharged by the pulse capacitor () via the circuit to the welding electrode (). In order to create said type of ignition method and an ignition circuit () 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 () is connected to a pulse compression circuit () comprising the pulse capacitor (), the high tension converter () and the circuit, the circuit being formed by a magnetic throttle valve (), such that a high frequency circuit of the ignition pulse can be obtained.

Method and circuit for contactless ignition of a welding arc with high frequency ignition pulse packets

The invention relates to a device for protecting an electrode during the resistance welding of workpieces, in particular sheet metal. Said device comprises a strip that is placed over the electrode and can be displaced in relation to the latter, a backing material of said strip having an electrically conductive coating. To improve the welding quality, the coating is applied to the opposite side of the strip from the electrode and consists of a material, whose hardness is less than that of the backing material of the strip. The soft, electrically conductive coating improves the transfer of current from the electrode to the workpiece, thus preventing weld spatter and improving the welding quality.

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Piberbach, Austria

Gerald Hieslmair