Abstract:
The cover and case of fusible material forming the enclosure for a semiconductor chip are provided with a hermetically sealed joint in the form of a "stitch" weld along the marginal edge of the cover by multiple impulse, overlapped spot welding, with the heat of the welding current confined to a zone spanning the distance between a pair of pressure-imparting electrodes and transmitted transversely of the side wall of the case, thereby avoiding heat transfer across the case with consequent damage to the circuitry, electrical devices, semiconductor material and other contents of the case. A special carrier provides a mount for the case and, through use of a template on the carrier and a drive associated with the template, the case and cover are advanced or indexed in small increments after each resistance weld cycle, relocating the package in readiness for the next succeeding welding step.
Abstract:
Multiple movable support members positioned to shape transverse elements about multiple longitudinal elements, each support member supporting an electrical welding member and a shaping member which, upon movement of the support member, simultaneously shapes a transverse element about a longitudinal element and welds the transverse element to the longitudinal element.
Abstract:
Grid bodies which consist of two parallel plane grid mats of longitudinal and transverse wires crossing one another and welded together at the points of cross, and of spacer wires, which hold the mats spaced apart and which are welded at each end to one wire of one of the two grid mats, are produced in a continuous method and in such a way that if necessary an insulating core may be introduced into the grid body during its production. For this purpose two widths (3,4) of grid matting are drawn off in steps from stock coils (1,2), straightened and arranged at a distance apart. Simultaneously a number of wires (22,23) are drawn off in steps from stock coils (20,21), straightened and introduced through one (3) of the widths (3,4) of grid matting from the side into the gap between the widths of grid matting, welded to one wire in each width of grid and separated from the wire stock.
Abstract:
The disclosure relates to the production by means of an electrical resistance welding method, of grids formed from metal wires crossing over another. The grid wires are carried through between rows of cooperating electrodes and, under pressure, are welded together at the cross points of the wires by an electric current. Each cross point of the wires and the surfaces of the associated electrodes of the grid welding machine, which lie in the welding region, are subjected to the action of a liquid coolant to increase the life of the electrodes and reduce distortion of the grid due to the localized heating of the wires.
Abstract:
A method of manufacturing a welded can body from tinplate or a tin-iron alloy plated steel sheet comprises overlapping the opposite marginal portions of a blank of the tinplate or the tin-iron plated steel sheet to form a can body preform having an overlapping portion, applying at least to the cut edges of the marginal portions of the blank a fluxing agent promoting wetting of steel with molten tin, and electrical resistance seam welding the overlapping portion in a nonoxidizing atmosphere by employing a pair of wire electrodes each covered by a layer of metallic tin on the surface thereof facing the overlapping portion. The welded portion has improved corrosion resistance, as an extruded weld portion and a remaining cut edge surface portion thereof are covered with tin transferred from the surfaces of the wire electrodes and/or the tinplate during the welding operation.
Abstract:
A welding electrode pair of the present invention has substantially columnar first and second welding electrodes coaxially disposed so that their respective tip end faces face each other. Formed on the tip end face of the first welding electrode is a first contact portion protruding therefrom and extending substantially in parallel thereto across the tip end face. Formed on the tip end face of the second welding electrode are second contact portions protruding therefrom substantially in parallel with the tip end face and the first contact portion as if the second contact portions were fit over the first contact portion, extending across the tip end face, and having a substantially circular arc portion at the projected end thereof.
Abstract:
An apparatus for resistance welding of the longitudinal seam of can bodies by means of electrode rollers which are suspended so as to be oscillatingly drivable transversely with respect to the edges of the can bodies which are to be welded, in order to prevent premature wear of the electrode rollers due to the formation of notches, scoring or the like. The lower electrode roller which is additionally oscillatingly or reciprocatingly suspended in vertical direction provides outstanding accessibility and low dead mass of the moved parts.
Abstract:
A welding apparatus including, generally, a vertical clamping assembly having an upper and a lower clamping assembly for each of two rail sections to be welded together. These vertical clamping assemblies clamp and vertically align the running surfaces of the two rail sections, by establishing the running surfaces at a pre-determined stop level. The welding apparatus also includes a horizontal centering and aligning apparatus which has a first pair of clamping arms which engage the rail base and pre-center the rail sections with respect to one another and to the welding apparatus. The apparatus also includes a pair of spaced apart clamping arms associated with each of the rail sections which are operable to both laterally clamp the rail heads of the respective rail sections and to horizontally or laterally align the rail sections with respect to one another. Once aligned, the ends of the rail sections are welded together.
Abstract:
A multi-spot resistance-welding machine for manufacturing welded grids consisting of a group of longitudinal wires and crosswires crossing the longitudinal wires at right-angles, to enable grids to be manufactured in which the length of at least some of the crosswires is smaller than the width of the grid and in which the relative position of these shorter crosswires can be selected with respect to the group of longitudinal wires, is equipped with two crosswire feed devices (16, 40) of which at least one, but preferably both, can be displaced and fixed in an allocated guide (15, 17; 51, 52) transversely to the feed path of the group (70) of longitudinal wires and relative to a delivery device (60) transferring the crosswires from the feed devices into the welding area.
Abstract:
A terminal pin of a coil bobbin has opposed sets of notches sized, shaped and spaced so as to permit magnet wire to be wrapped around the terminal pin in a spiral path defined by the notches. Because the magnet wire is received in the notches, the notches function to properly locate the wire on the pin and to maintain the wire stationary. The notches have a depth selected so that the portions of the magnet wire received in the notches are recessed below an outer surface of the pin, whereby electrodes used to fuse the magnet wire to the pin are allowed to contact the pin and thereby form a closed circuit. The resulting heat melts the insulation on the magnet wire to permit the fusing of the wire to the pin.