Abstract: To ensure safe operation of a welding apparatus, low-voltage pulses occurring on a low-voltage side of the welding apparatus are transformed into high-voltage pulses occurring on a high-voltage side of the welding apparatus, an arc is ignited between an electrode and a workpiece during an ignition mode and/or idling mode using the high-voltage pulses, provision is made, in the ignition mode and/or in the idling mode, for a time window that extends from a starting time point to an end time point, an amount of ignition energy at the electrode is determined during the time window and compared with an energy limit value, and an action is triggered in the event of the energy limit value being exceeded, in order to prevent further high-voltage pulses in the time window.

Abstract: A welding current source for providing a welding current and a welding voltage at an output in order to carry out an arc welding process includes an input-side rectifier, an inverter, which is operated with a switching frequency, a transformer having a primary winding and at least two secondary windings, at least two rectifiers arranged between the secondary windings and the output, and at least one capacitor and one load resistor at the output. At least one current-limiting reactor is arranged on the second secondary winding and the load resistor for discharging the capacitor, which can be charged by the current-limiting reactor, the current-limiting reactor, and the capacitor are dimensioned in such a way that the maximum value of the no-load voltage at the output is greater than the voltage corresponding to the transmission ratio of the primary winding to the secondary winding of the transformer.

Abstract: The invention relates to a method for contactless ignition an arc (L) between an electrode (3) and a workpiece (4) which is to be welded, for carrying out a welding process, wherein a welding current (I) and a welding voltage (U) are provided at an output (2) of a welding current source (1), wherein the welding current source (1) contains a resonance converter (5) for generating a periodically varying, preferably substantially sawtooth-shaped, open circuit welding voltage (ULL) with voltage maxima (ULL,max) which recur periodically with a repetition rate (fw) and a welding current source (1) for carrying out the igniting process.

Abstract: A welding current source for providing a welding current and a welding voltage at an output in order to carry out an arc welding process includes an input-side rectifier, an inverter, which is operated with a switching frequency, a transformer having a primary winding and at least two secondary windings, at least two rectifiers arranged between the secondary windings and the output, and at least one capacitor and one load resistor at the output. At least one current-limiting reactor is arranged on the second secondary winding and the load resistor for discharging the capacitor, which can be charged by the current-limiting reactor, the current-limiting reactor, and the capacitor are dimensioned in such a way that the maximum value of the no-load voltage at the output is greater than the voltage corresponding to the transmission ratio of the primary winding to the secondary winding of the transformer.

Abstract: The invention relates to a method for contactless ignition an arc (L) between an electrode (3) and a workpiece (4) which is to be welded, for carrying out a welding process, wherein a welding current (I) and a welding voltage (U) are provided at an output (2) of a welding current source (1), wherein the welding current source (1) contains a resonance converter (5) for generating a periodically varying, preferably substantially sawtooth-shaped, open circuit welding voltage (ULL) with voltage maxima (ULL,max) which recur periodically with a repetition rate (fw) and a welding current source (1) for carrying out the igniting process.

Abstract: A difference file which indicates a difference between a second relational database and a first relational database may be transferred to a navigation device. The navigation device may store a first compressed database version of the first relational database. The navigation device may restore database pages of the second relational database based on the first compressed database version and the difference file. The restoration may be performed on per-page level. The restoration may involve reading and uncompressing a database page from the first compressed database version, and modifying the uncompressed database page in accordance with the difference file. The modified database page, which may correspond to a restored page of the second relational database, may be compressed and appended to a target database.

Abstract: A nickel electrolyte comprising: nickel salts, organic acid or salts thereof, from 0.05 to 1 g/l of inorganic solid with a grain size (d50) of from 0.1 to 3 ?m.

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.

Abstract: The invention relates to a multi-functional remote controller (27) for a welding apparatus and a welding current source, which remote controller can be connected to the welding apparatus and the welding current source by at least one line, the remote controller (27) having setting elements and switching elements and at least one display unit. The remote controller (27) has a memory, in particular a memory card, and at least one additional interface, in particular a USB terminal, and the various parameters, functions and/or operating modes are set and edited by a menu-driven system.

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.

Abstract: The invention relates to a multi-functional remote controller (27) for a welding apparatus and a welding current source, which remote controller can be connected to the welding apparatus and the welding current source by at least one line, the remote controller (27) having setting elements and switching elements and at least one display unit. The remote controller (27) has a memory, in particular a memory card, and at least one additional interface, in particular a USB terminal, and the various parameters, functions and/or operating modes are set and edited by a menu-driven system.