Abstract: A welding gun has two projecting electrode arms that are interconnected and able to move relative to each other and whose free ends each hold one welding electrode. The welding gun also has an electrode drive that moves the electrode arms from a closed position, in which the welding electrodes are located close together, to an open position. The welding gun projecting electrode arms have a movement sequence that optimizes welding precision. The electrode arms are attached to a linear guide so that they are able to be displaced linearily relative to each other.

Abstract: Apparatus for resistance welding with different welding currents has a welding transformer having a primary and a secondary side. Two welding electrodes are connected at the secondary side to the welding transformer and are each arranged on a respective control arm, one of the arms being movable by an actuating drive. A control and regulating arrangement is connected on the primary side between the welding transformer and a connection to a three-phase network. The control and regulating arrangement has a rectifier circuit connected to all three phases of the network and a controllable welding inverter for converting the rectified voltage into voltage pulses of alternating polarity at a predetermined frequency. At least one electronic component of the rectifier circuit and/or the welding inverter is connected to the drive for moving one of the control arms, for controlling and/or powering the drive.

Abstract: Apparatus for resistance welding with different welding currents has a welding transformer having a primary and a secondary side. Two welding electrodes are connected at the secondary side to the welding transformer and are each arranged on a respective control arm, one of the arms being movable by an actuating drive. A control and regulating arrangement is connected on the primary side between the welding transformer and a connection to a three-phase network. The control and regulating arrangement has a rectifier circuit connected to all three phases of the network and a controllable welding inverter for converting the rectified voltage into voltage pulses of alternating polarity at a predetermined frequency. At least one electronic component of the rectifier circuit and/or the welding inverter is connected to the drive for moving one of the control arms, for controlling and/or powering the drive.