Abstract: In order to synchronize the at least two pulse welding processes performed simultaneously by welding devices in a multiple pulse welding process, the welding devices are connected to one another by a communication link and synchronization information is transmitted via the communication link from a transmitting welding device to at least one receiving welding device. The synchronization information is used in the receiving welding device to synchronize the pulse welding process performed by the receiving welding device with the pulse welding process performed by the transmitting welding device.

Abstract: Method for compensating an interfering influence on a welding current, provided by a welding power source (4) for welding a workpiece (3), from another welding power source (4?), comprising the steps of: (a) providing (SA) a compensation voltage (UKomp), which is calculated on the basis of a welding current progression provided by the other welding power source (4?); (b) subtracting (SB) the compensation voltage (UKomp) from a measured voltage (UMess), measured by a voltage measurement unit (8) of the welding power source (4), so as to determine a corrected measured voltage (U?Mess); and (c) regulating (SC) the welding current generated by the welding power source (4) as a function of the corrected measured voltage (U?Mess).

Abstract: A welding device allows uninterrupted welding with maximum welding quality even in the case of welding processes performed simultaneously in close proximity by several welding devices. In a normal operating mode, the control unit of the welding device ignores a first welding voltage signal of a first voltage-measuring device and uses a second welding voltage signal, detected closer to the are, of a second voltage-measuring device to determine the control parameters. The control unit detects an error state in the second welding voltage signal on the basis of the second welding voltage signal and, upon detecting the error state, switches to an emergency operating mode without interrupting the welding process. In the emergency operating mode, the control unit ignores the second welding voltage signal of the second voltage-measuring device and uses the first welding voltage signal of the first voltage-measuring device to determine the control parameters.

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: In order to synchronize the at least two pulse welding processes performed simultaneously by welding devices in a multiple pulse welding process, the welding devices are connected to one another by a communication link and synchronization information is transmitted via the communication link from a transmitting welding device to at least one receiving welding device. The synchronization information is used in the receiving welding device to synchronize the pulse welding process performed by the receiving welding device with the pulse welding process performed by the transmitting welding device.

Abstract: A method for determining an interfering coupling between welding circuits (2-i) of a welding system (1) comprises the following steps: applying (S1) a predetermined current profile (SP) in a first welding circuit (2-1) of the welding system (1); detecting (S2) a voltage progression and/or current progression thus induced in a second welding circuit (2-2) of the welding system (1), and determining (S3) the interfering coupling on the basis of the current profile (SP) of the current applied in the first welding circuit (2-1) and of the voltage progression and/or current progression detected in the second welding circuit (2-2).

Abstract: Method for compensating an interfering influence on a welding current, provided by a welding power source (4) for welding a workpiece (3), from another welding power source (4?), comprising the steps of: (a) providing (SA) a compensation voltage (UKomp), which is calculated on the basis of a welding current progression provided by the other welding power source (4?); (b) subtracting (SB) the compensation voltage (UKomp) from a measured voltage (UMess), measured by a voltage measurement unit (8) of the welding power source (4), so as to determine a corrected measured voltage (U?Mess); and (c) regulating (SC) the welding current generated by the welding power source (4) as a function of the corrected measured voltage (U?Mess).