Abstract: A process and a system are proposed for short-time arc-welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.

Abstract: A process and a system are proposed for short-time arc-welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.

Abstract: A short-cycle arc-welding system (10) and a method for welding elements (32), such as metal bolts (32) to components (34) such as sheet metal (34) includes a robot (12), having at least one arm (16) displaceable on at least two co-ordinate axes (x, y, z), a welding head base (20) fixed to robot arm (16), a welding head (22) displaceably mounted on welding head base (20), a retaining device (30) retaining an element, a lifting device (36) for setting and re-positioning retaining device (30) in relation to welding head (22), and a measuring system (44,46) determining the relative position between component (34) and element (32). Measuring system (44,46) has a control device (46), controlling lifting device (36) such that element (32) displaces towards component (34) until contacting component (34) to determine the relative position.

Abstract: What is proposed is a joining system head (22; 170) for fixation to a movable frame (12), in particular to a robot (12), having holding means (66; 174) for an element (36) to be joined to a part (38), and joining drive means (64; 175) to move the holding means (66; 174) along a joining direction (40; 176) for joining. The said holding means (66; 174) is mounted on the joining system head (22; 170), rotatable about an axis (34) running transverse to the joining direction (40; 176).

Abstract: The invention relates to a short-cycle arc welding system comprising a robot having at least one arm which can be displaced in at least one coordinate axis (x, y, z), a welding head which is positioned on the arm and on which a holding device or holding an element and a lifting device are provided, said lifting device moving the holding device back and forth in relation to the welding head and a measuring system for determining the relative position between a component and an element which is held by the holding device and is to be welded to the component. Said measuring system comprises a foot which is mounted on the welding head and which is embodied in such a way that, during operation, it is in contact with the component in order to determine the relative position between the element and the component.

Abstract: A process and a system are proposed for short-time arc welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element. The initiation of the lowering operation and/or the lowering operation itself is controlled as a factor of the detected lifting height such that a previously specified total welding time is achieved.

Abstract: A process and a system are proposed for short-time arc welding, in particular for stud welding, with the step of sampling a welding parameter, in particular the arc voltage (U), during at least one time segment (Ts) of the welding operation, in order to detect disturbances, wherein the measurement curve determined from the sampling operation is smoothed and subsequently wherein at least one tolerance curve is generated which lies at a previously adjustable distance from the smoothed measurement curve, and subsequently the unsmoothed measurement curve is compared with the tolerance curve in order to detect high-frequency disturbances.

Abstract: A weld-on part made of aluminum or an aluminum alloy, such as but not limited to a stud (1), which has a surface which is at least partially provided with a layer (5) which contains a titanium containing material. The stud (1) is treated with a chrome-free passivating solution which imparts corrosion resistance while simultaneously causing a layer (5) of titanium containing material to be formed on at least a portion of the surface of the stud (1). The layer (5) of titanium containing material permits the stud (1) to be satisfactorily welded to a surface, without the occurrence of arc jumping or blowing, in part, by lowering contact resistance during the welding process.

Abstract: A short-cycle arc-welding system (10) and a method for welding elements (32), such as metal bolts (32) to components (34) such as sheet metal (34) includes a robot (12), having at least one arm (16) displaceable on at least two co-ordinate axes (x, y, z), a welding head base (20) fixed to robot arm (16), a welding head (22) displaceably mounted on welding head base (20), a retaining device (30) retaining an element, a lifting device (36) for setting and re-positioning retaining device (30) in relation to welding head (22), and a measuring system (44,46) determining the relative position between component (34) and element (32). Measuring system (44,46) has a control device (46), controlling lifting device (36) such that element (32) displaces towards component (34) until contacting component (34) to determine the relative position.

Abstract: The invention relates to a short-cycle arc welding system comprising a robot having at least one arm which can be displaced in at least one coordinate axis (x, y, z), a welding head which is positioned on the arm and on which a holding device or holding an element and a lifting device are provided, said lifting device moving the holding device back and forth in relation to the welding head and a measuring system for determining the relative position between a component and an element which is held by the holding device and is to be welded to the component. Said measuring system comprises a foot which is mounted on the welding head and which is embodied in such a way that, during operation, it is in contact with the component in order to determine the relative position between the element and the component.

Abstract: A process and a system are proposed for short-time arc welding elements, such as for example metal studs, on to components, such as for example metal sheets, wherein an element in the context of a welding operation is initially raised in relation to the component, a welding arc is formed between the element and the component, and the element is lowered again, the lifting height of the element in relation to the component being detected at least within a time segment between raising and lowering of the element.

Abstract: A process and a system are proposed for short-time arc welding, in particular for stud welding, with the step of sampling a welding parameter, in particular the arc voltage (U), during at least one time segment (Ts) of the welding operation, in order to detect disturbances, wherein the measurement curve determined from the sampling operation is smoothed and subsequently wherein at least one tolerance curve is generated which lies at a previously adjustable distance from the smoothed measurement curve, and subsequently the unsmoothed measurement curve is compared with the tolerance curve in order to detect high-frequency disturbances.

Abstract: A stud welding device comprises a stud holder and a movable member which moves the stud holder to carry a stud into position for welding. The movable member is provided by the stator or the armature of a helical thread reluctance motor.

Abstract: Process for welding a weld stud onto a workpiece by means of a drawn arc, in which the weld stud is placed onto the workpiece and, with performance of a welding stroke, is removed from the workpiece in a return stroke, igniting a pilot arc, and is advanced toward the workpiece again in a forward stroke during the combustion of a connected welding arc. The welding arc is divided by pulse-wise current reduction to a minimum value into a sequence of current pulses and the last of these current pulses is extended in time by at least about 1.5 times relative to the preceding current pulses. This extended current pulse lasts substantially to the end of the forward stroke.

Abstract: Method of controlling stud-welding apparatus wherein the lifting coil is essentially current and voltage free at the beginning of the plunge stroke but the plunge stroke is damped by a pulse current applied to the lifting coil a very short time before impact and ceased when the stud contacts the workpiece.

Abstract: Control circuit for arc welding components to workpieces, in which a component is placed on to a workpiece by a weld gun and after a welding stroke is lifted from the workpiece in a return stroke by igniting a pre-current arc and is brought up to the workpiece again in a forward stroke during the burning of an interconnected welding arc, in which a sequencing control determines the tripping moments of return stroke and forward stroke as well as of the welding arc and a monitoring voltage is bypassed from the pre-current arc ignited at the welding point, characterized in that the monitoring voltage (V) is converted into a correction voltage (line 27) by means of a set-point comparator (25) and is superposed on a control voltage (line 18) for principally controlling a high-frequency modulated switching mode power supply unit (15) and said switching mode power supply unit (15), in accordance with the thus corrected control voltage, adjusts its output current (lines 13,14) during the respective welding operation