Abstract: The device proposed is designed to weld together at least two parts (1, 2) using arc-welding or resistance-welding, in particular pressure arc-welding, techniques. An arc is struck across a gap between the two parts (1 and 2), thus causing them to melt. In oder to ensure a very precisely defined vertical gap between the parts, the second part (2) is first placed on the first. The final position, determined by a program-control unit (12), is measured by means of a travel-measurement instrument (10). Starting from this "zero position", the bolt is lifted through a freely programmable distance and the main welding current activated. On expiry of the prescribed period of time, the bolt on the second part (2) is moved towards the first part (1), this movement also being carried out under program control.

Abstract: A device for welding a weld-on part (2) on a supporting board (3) has a handling gear (10) with a holding arrangement (12) for positioning the weld-on part (2) at a defined welding spot on the supporting board (3). The device (1) has a welding arrangement (20) whose welding element (21) may be adjusted by a positioning arrangement (30; 31-33) in at least one direction (R, .theta., Z) with respect to the weld-on part (2).