Abstract: An electrode assembly for simultaneously welding all the leads of a semiconductor chip to an outer lead frame is disclosed. The electrode assembly includes a gross electrode opposed to a plurality of spot electrodes, and a plurality of parallelogram support members for the spot electrodes, and a housing. Each of the plurality of parallelogram support members includes a first leg fixedly attached to the housing and a second leg supporting one of the spot electrodes. Each of the second legs is resiliently deformable into a stressed position when the electrode supported thereby is biased against the work piece whereby each spot electrode is independently responsive to structural changes in the work piece and contact is maintained between the work piece and the spot electrodes during the entire welding operation.

Abstract: Apparatus for making butt-welded tube from a strip includes a pair of grooved weld rolls for aligning the longitudinal edges of the strip bent into a tubular shape. To insure that the inside seam of the tube is flush regardless of variations in thickness between strip edges, each roll is made in two sections. In a horizontal mill the seam is on top and each bottom roll section is fixed in horizontal position while the top roll section has limited axial movement. Resilient means bias the roll sections apart and against a top stop so that the top of one edge of the strip is higher than the other when the edges are of different thicknesses. If desired, the rolls may also be adjusted to insure that the outside seam of the tube is flush.

Abstract: A method and apparatus for positioning nuts to be welded to a base such as a steel sheet. The base is located between a pair of relatively movable welding electrodes, one of which has a retractable nut supporting and locating pin with a tapered shoulder, the pin being movable in the electrode and extending from its contact face. A nut is placed on the pin and locked onto the tapered shoulder. As the electrodes move together to a welding position the supporting and locating pin is depressed so that the nut comes into engagement with the contact face of the respective electrode. The nut is consequently freed from its taper lock on the supporting and locating pin as it is pressed against the base by the contact face of the respective electrode. Welding current is then passed between the electrodes through the nut and the base to weld the nut in place.

Abstract: Improved extrusion-fusion-type intercell connectors and process involving: casting the plate strap lugs to be welded from a hypoeutectic lead-antimony alloy containing at least about 2 percent by weight antimony; initially extruding the lugs into contact through an aperture in a battery intercell partition, the contact area being between 15 and 75 percent of the area of the aperture; and gradually heating the lug extrusions through a softening stage, an antimony-rich-phase melting stage, and an antimony-lean-phase melting stage. Force applied by rapid-response, declining-force welding electrodes causes (1) the softened extrusions to reshape somewhat prior to melting, and (2) the antimony-rich-phase of the alloy to exude out of the welding zone filling voids in the aperture before any substantial melting of the antimony-lean-phase occurs.

Abstract: An automatic welding apparatus comprising a workpiece fixture carried by a moving member for rotation about a horizontal axis extending in a back and forth direction, said moving member being provided on a carriage for sliding movement in a lateral direction, said carriage being provided for sliding movement in said back and forth direction, and a torch fixture carried by an arm for rotation about a vertical axis, said arm being provided for sliding movement in the vertical direction. In another embodiment, the workpiece fixture is provided only for rotation about a horizontal axis extending in the back and forth direction, and the torch fixture is carried by the arm for rotation about the vertical axis, which arm is provided at the end of a column for sliding movement in said lateral direction, which column is provided on a sliding member for sliding movement in the vertical direction, which sliding member is provided on a guide for sliding movement in said back and forth direction.

Abstract: An apparatus for automatically connecting battery plate units of adjacent cells through apertures in partitions between adjacent cell chambers of battery cases with said connection being effected by pressing lead projections of adjacent battery plate units together within each partition aperture and electrically fusing said projections together to form an electrical connection therebetween and completely fill said aperture and seal said chambers: comprising a work station in said apparatus where said plate units are connected, a conveyor for moving battery cases assembled with plate units into and from said work station, an electrode assembly comprising a pair of opposed electrodes adapted to fit into adjacent cell chambers and over said projections and apertures, indexing means for effecting relative movement of the battery case and electrode assembly at said work station for bringing the battery case into exact registry with the electrode assembly for effecting the connection, means for forcing said electro

Abstract: A head assembly for electrically welding a stud to a metallic substrate. outer portion of the head is formed of a highly conductive material such as copper, and has a bore therewithin which terminates in a conical surface for engaging the underside of the head of a stud to be welded. Disposed within the bore is a nickel sleeve for retaining the shank of the stud, and a magnet for holding the stud in place. In a preferred embodiment the magnet is spring-loaded and coupled to a microswitch which actuates a control mechanism.

Abstract: Apparatus for a continuous tandem electrical heat treating process for wire conductors for cables uses electrical contact pulleys having faces of a high melting point conductive material such as tungsten-copper. The melting point of the material is at least 1200.degree. C. The novel apparatus has reduced wear, arcing and wire breakage. Free running pulleys are also used instead of driven ones to avoid excessive tension. The free running pulleys have low torque contacts to apply high electrical current to heat the wire.

Abstract: The seam welding head has an outer annular electrode connected to the hub by means of a resilient annulus bridged by multiple laminated conductors. The electrode is water cooled. The resilient annulus is stressed as the electrode is moved into contact with the work and provides the follow-up force during the forging phase of the welding cycle. The relatively small weight of the electrode permits fast follow-up without excessive force and permits much faster welding.

Abstract: One side of a source of electrical energy is connected to a dented metal sheet and a hammer electrode connected to the other side of the source is successively brought into instantaneous contact with a multiplicity of locations spaced apart over the dent. The sheet is electrically heated at the location so that stresses in the sheet are relieved, thereby relaxing the sheet and flattening the dent. The electrode is generally L-shaped and has a pointed copper tip surrounded by a safety sleeve with only the point of the tip projecting from the sleeve.

Abstract: Metal forming methods in which a workpiece is heated and subjected to pressure, causing the metal to become plastic and flow into a selected configuration. Apparatus in which the method can be carried out and tooling for use in the methods and apparatus.

Abstract: The present invention relates to a method for joining a solid copper member to a stranded copper member employing phosphorus-silver-copper alloys as the joining material and in which resistance heating is utilized in forming the joint. More specifically, the invention employs a copper tungsten alloy for the tip portion of an electrode which is in contact with the stranded copper member to enable good joints to be made.