Abstract:
Zur Bewertung der Schweißung beim Bolzenschweißverfahren wird der zeitliche Verlauf des Widerstands R(t) zwischen Bolzen und Werkstück ermittelt. Überschreitet der Widerstand oder der Widerstandsanstieg oder die Widerstands-Anstiegsrate während des Lichtbogenbrennens einen Vorgabewert, so weist dies auf Blaseffekte, Spritzerbildung und ein Brennen des Lichtbogens außerhalb der Bindungsfläche hin - Effekte, die die Qualität der Schweißung beeinträchtigen. Bei Feststellen einer bestimmten Widerstandserhöhung wird daher der Schweißvorgang durch Abschalten des Schweißstroms oder sofortiges Eintauchen des Bolzens in die Schmelze beendet. Alternativ können aus dem bei einem ersten Schweißvorgang ermittelten Widerstandsverlauf die Parameter für nachfolgende Schweißvorgänge eingestellt werden.
Abstract:
A stud welding system wherein welding is prevented unless the armature is located within an acceptable displacement window. A D.C. signal representative of armature position is generated by connecting differential amplifier across the coil and applying a constant voltage across the coil. The output of the amplifier is converted to a D.C. signal which is received by window comparator which will enable welding only when the armature is properly located.
Abstract:
Das elektrisches Bolzenschweißgerät enthält eine Schweißpistole für einen anzuschweißenden Bolzen an ein Werkstück und ein Steuergerät. Dieses besitzt eine Schweißstromquelle sowie Steller für die Schweißzeit und den Schweißstrom. Die Schweißpistole und das Steuergerät sind über zwei Schweißstromleitungen verbunden. Es ist ein nur die beiden vorhandenen Schweißstromleitungen (5, 6) benutzender Pilotstromkreis vorhanden. Ferner ist eine der Schweißpistole (3) zugeordnete Stellvorrichtung (10) vorhanden, die in diesen Pilotstromkreis eingeschaltet ist. Im Steuergerät (2) ist ein Fühler (9) vorhanden, der abhängig von den von der Stellvorrichtung (10) je nach Betätigung der daran angeordneten Stellern (13, 14) erzeugten Steuersignale die im Steuergerät vorhandene Steuervorrichtung (8) für die Schweißzeit und den Schweißstrom steuert.
Abstract:
Die Erfindung bezieht sich auf einen T-Bolzen (1) zur Anwendung beim Bolzenschweißen mit automatischer Zuführung, insbesondere für die Automobilindustrie, mit einem innerhalb eines Bolzenhalters (7) geführten und von einem Werkzeugteil (6) beaufschlagbaren Bolzenkopf (5) und einem daran anschließenden Bolzenschaft (3), dessen Stirnflächenbereich (4) mit einem Träger verschweißbar ist. Erfindungsge- mä8 ist die vom Werkzeugteil (6) beaufschlagbare Kopfoberseite (5) des Bolzenkopfes (2) zumindest über einen Teilbereich mit Rillen (8) versehen.
Abstract:
Joining apparatus (12) for joining joining elements (48) onto workpieces (54), comprising a joining element holding device (32), which is configured to radially hold a joining element (48), and comprising a loading pin arrangement (40), which is configured to slide a joining element (48) axially into a holding position (H) in the joining element holding device (32), and/or to axially support the joining element (48) during a joining process, wherein the loading pin arrangement (40) has a loading pin (44), which is slidable by means of a loading pin actuator arrangement (60) in the direction of the joining element holding device (32). The loading pin arrangement (60) is here designed to variably establish a loading pin stroke (100, 106) of the loading pin (44) between at least two stages, so that in a first stage the loading pin (44) is displaceable less far in the direction of the joining element holding device (32) than in a second stage.
Abstract:
An anchoring assembly (11) for anchoring a liner of a cured lining material arranged to be applied in liquid form to a metal object provided with said anchoring assembly (11), said anchoring assembly (11) comprising an elongated mounting pin (17) and a ferrule (15) provided at a first end of said elongated mounting pin (17), wherein said elongated mounting pin (17) is arranged to be mounted, at said first end, to said metal object, said anchoring assembly (11) further comprises a plurality of spaced anchor fins (2), wherein said plurality of spaced anchors fins (2) are connected to said elongated mounting pin (17) at a second end and extend radially outwardly with respect to said elongated mounting pin (17), wherein said ferrule (15) comprises a radially outwardly extending place holder part (14) arranged to be held by a ferrule holder (12) during mounting of said elongated mounting pin (17), at said first end, to said metal object.
Abstract:
A method for joining studs to workpieces, in particular for the purpose of stud welding, comprising the steps of acquiring a distinguishing dimension of a stud to be joined by the application of a sensing element to the stud and through measurement of a travel distance of the sensing element as it is applied to the stud; and then joining the stud to a workpiece, if the dimension of the stud is within an allowable tolerance range, and the allowable tolerance range is adapted in dependence on the travel distance of the sensing element measured during a preceding method step.
Abstract:
The present application relates to a stud welding method for welding a component (12) to a surface (16) of a workpiece (14), comprising the steps of: lowering the component (12) onto the surface (16) of the workpiece (14) and switching on an electric current (I); lifting the component (12) off the workpiece (14), with the result that an arc (24) which is oriented substantially in the longitudinal direction (21) is struck; influencing the arc (24) using a magnetic field (27), with the magnetic field (27) being oriented at a general magnetic field angle in relation to the longitudinal direction (21) and having an axial component (BA) and/or a radial component (BR); and lowering the component (12) onto the workpiece (14) in order to establish the weld connection; wherein the magnetic field angle is varied over the arc duration in order to dynamically influence the arc (24) by the mathematical sign of the radial and/or of the axial component (BR, BA) being changed at least once over the arc duration.
Abstract:
The present invention relates to a holding fixture (60) for pins (26) comprising a radially protruding flange segment (30), having a clamping jaw component (39) comprising a clamping segment (38) and a hollow insertion segment (36), wherein a pin (26) can be inserted into the clamping segment (38) via the insertion segment (36), and wherein the clamping segment (38) is designed for exerting a clamping force directed radially inward for clamping the pin (26), and wherein a retaining device (62) past which a flange segment (30) of the pin (26) can be guided is disposed at the insertion segment (36), said device being designed relative to the clamping segment (38) such that a pin is fed past the retaining device (62) and is supported and retained in a retaining position between the retaining device (62) and the clamping segment (38). The present invention further relates to a rivet head (14) having a holding fixture (60) and a method for feeding a pin (26).
Abstract:
The invention relates to a method for joining a fastening element (12) to a component (14), with the steps: Insertion of the fastening element (12) into a holding device (16); Positioning of the holding device (16) above the component (14); Lowering of the fastening element (12) onto the component (14) until the fastening element (12) impinges onto the component (14), lowering taking place in such a way that the fastening element (12) impinges onto the component (14) with low momentum ( Fig. 1 ).