Abstract: When spot-welding a workpiece including a thin plate, a first thick plate, and a second thick plate, the workpiece is clamped by a fixed electrode in contact with the second thick plate, a movable electrode in contact with the thin plate, and control-pressure applying unit set adjacent to the movable electrode and in contact with the thin plate. Pressure is applied to the second thick plate by the fixed electrode, and pressure and control pressure are respectively applied by the movable electrode and the control-pressure applying unit to the thin plate. The pressure from the fixed electrode is controlled to be smaller than the pressure from the movable electrode. The current density between the thin plate and the first thick plate increases.

Abstract: A system for forming a weld nugget in a metal work piece includes a power supply, actuator, electrodes, and controller. The actuator delivers a variable electrode force to the work piece in response to a force command. The controller executes a method by transmitting a welding current command to the power supply to cause the power supply to output a welding current to the electrodes. The controller transmits the force command to the actuator to apply the variable electrode force, via the electrodes, to the work piece at a first force level. The variable electrode force increases from a second force level immediately upon conclusion of a first duration to minimize weld expulsion. The second force level commences at a point in time in the dynamic resistance profile at which a dynamic resistance value of the work piece decreases at a threshold rate during formation of the weld nugget.

Abstract: A method and a device produce a fleece of metallic fibers in a layer in which the metallic fibers are welded to one another to form the fleece. A welding process is repeatedly carried out with regard to a portion or section of the fleece. Such metallic fiber fleeces are used, in particular, for exhaust gas treatment units in the automobile industry.

Abstract: A resistance bonding method comprises contacting a plurality of bonding members, which are electro-conductive, supplying current to the bonding members under a stress applied to a contact interface therebetween by means of plural electrodes in contact with the bonding members thereby to bond the members. The current supply is conducted by switching energizing paths. Part of the members is thermally expanded by current supply before one of the bonding members is contacted with other member, and the members in contact with each other are bonded by the second current supply.

Abstract: An induction forging coil apparatus which makes induction forge coils easier and faster to change on a forge-line. The coil insert is a separate independent unit by itself which slides into the frame to connect to the frame via bus connections and other components. The coil insert is attached to the frame (another separate independent unit by itself) to complete the overall induction heating coil. The induction coil (with both units attached and operatively interconnected) can run on the forge line until it blows/fails, and instead of pulling the whole induction coil (both units attached) off-line to be rebuilt; the frame can be left on-line (or pulled off-line for a brief period of time if there is not enough room to reach the components due to the particular forge-line setup) to switch the failed insert with a new or rebuilt insert, by disconnecting the failed coil insert from the frame and then reconnecting the frame with the new or rebuilt coil insert.