Newfrey Lcc

Emhart Inc.

Roland Kurz

Klaus Gisbert Schmitt

Eckhard Blank

Richard Louis Eberling

Jorg Hofmann

Manfred Muller

Stefan Napierala

Simon Harries

The present invention relates to a weld-on fastener for an electrical contact with a weld nut () which, on its topside has an electric contact face () and, on its bottom side, has an annular axial projection () which surrounds a cavity () of a pre-determinable depth (T), and with a screw () screwed into the weld nut (), which screw () also has an electric contact face (), a spacer ring () being clamped between the contact faces (). The spacer ring () preferably has a thickness (D) which is approximately equal to the depth (T) of the cavity (). When the spacer ring () is clamped in, the screw () ends approximately flush with the end of the internal thread () of the weld nut (). This combination is distinctive in that it has only a low overall height, no metal scabs reach the thread () during welding-on, the contact faces () are protected during assembly and the welded connection can absorb high torques even when welding onto thin work pieces ().

Fastener for an electric contact

A welding device includes a holder for a weld part ( ) adapted to be moved substantially perpendicularly to, and away from, a surface of a workpiece ( ) on which the weld part ( ) is to be welded. An arc producing system produces an arc between the weld part ( ) and the surface of the workpiece ( ) with the arc generating a magnetic flux. A field former ( ) includes a low-retentivity steel and provides a flux path for the magnetic flux generated by the arc.

Welding device with a field former

A process and apparatus for welding a metal component to a metal workpiece. The component typically comprises a metal weld region and a threaded connector region and the apparatus includes a weld head comprising a nozzle for holding the weld region of the component adjacent the workpiece. The weld head induces a weld arc between the weld region of the component and the workpiece to create a weld pool of molten material. The weld head subsequently moves the weld region into the weld pool to permanently join the component to the workpiece. The apparatus further comprises a pressurized fluid source and a fluid flow control means for directing the pressurized fluid between the weld head and the component an weld pool so as to deflect any airborne fluid residue of the weld pool away from the connector region of the component.

Arc welding method and apparatus

An electric welding device for welding a fastening element (4) having a through-duct (17) on a workpiece is proposed. The welding device comprises a conveying and holding system (1) having a guide member (2) with a guide duct (3). The fastening element (4) is supplied to the guide duct and is held in one of its ends during the welding process. Within the guide duct there is arranged a loading member (6) which is capable of moving to and fro in the longitudinal direction thereof and has a head (7) which can be brought to rest on the fastening element (4). The loading member has a duct (9) with an inlet (10) and an outlet (11) formed on the head (7). A gas supply duct (12) opens into the guide duct (3). The loading member (6) closes the gas supply duct (12) in a first position. In a second position, the loading member (6) connects the inlet (11) to the gas supply duct (12) so a gas flows to the welding position during the welding process.

Electric welding device and method of welding a fastening element

The invention relates to a method of welding weld studs to a workpiece, in particular of aluminum in each case, by the stroke ignition method, in which the stroke height(s) of the weld stud (1) is altered as a function of the measured arc voltage and optionally of the arc firing time. In particular, the stroke height(s) of the stud (1) can be increased during the occurrence of short circuits, i.e. during a sudden drop in the arc voltage, preferably in predetermined steps. The weld stud is immersed into a pool of melt after a predetermined period of time of between 5 and 10 ms after the welding current has been switched off. The polarity of the stud or of the workpiece is changed at least once during the welding process. The welding current is interrupted for a predetermined period of time for this purpose. The method leads to an improved, readily reproducible quality of weld.

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Linden-Leihgestern, Germany

Roland Kurz