Abstract: The invention relates to a welding process for drawn arc stud welding wherein after ignition of the main current electric arc, the latter's voltage (U) is measured and, depending upon the measured voltage, the current flow of the continued main current electric arc and/or the dipping movement of the parts which are to be welded together, is regulated or controlled.

Abstract: A stud welding machine features several welding outputs for welding tools with different polarity for various welding operations. The polarity of at least one welding output is reversible.

Abstract: This electric stud-welding device includes a welding gun for a stud or bolt to be welding to a workpiece, and a control device. The latter consists of a welding current source and a setting device for welding time and welding current. The welding gun and the control device are connected through two welding current lines. A pilot current circuit is present, using only the two welding current lines (5, 6). Also present is a setting device (10), coordinated with the welding gun (3), which is switched into the pilot current circuit. In the control device (2), there is a sensor (9) which, dependent on the control signals produced by the setting device (10) each time, after the actuation of the selective switches or setters (13, 14) arranged thereon, controls the control device (8), present in the control instrument, for the welding time and the welding current.