Abstract: A microsurgical pincette consists of two metallic arm members and a metallic connection member, rigidly fixing the two arm members one to each other at an end region of the arm members. To ensure an electric insulation between the two arm members, a part of their length, including said end region, is provided with an oxide protection coating, preferably consisting of aluminium oxide, applied by plasma coating technique.

Abstract: A precision electric welding device is used for welding dental crowns and bridges in the mouth, the dental elements to be welded being made up of dentally suitable metals, especially of titanium and titanium alloys. The device comprises, in combination, an electronic welding base unit supplied with direct current voltage source and provided with a storage device containing a plurality of welding sequences, each welding sequence defining the energy requirements for successive pulses in a particular welding operation. The base unit generates a series of controlled voltage potentials for each operation, and an interdental precision electric welding gun is responsive to said series of controlled voltage potentials for performing the welding operations.

Abstract: An electrical work-in-circuit heating tool for metal bonding especially in cramped locations where flame heating and tong-style tools are not usable. The tool comprises a hinged pair of spring-loaded arms having electrically insulating open-ended handles each of which contains a conductor bar within a grip portion thereof. The hinge comprises pivotally joined radial webs and the spring-loading is adapted to urge the distal ends of the arms toward each other. Each of the conductor bars is connected within an insulating grip portion of the handle to an electrical supply cable. At the distal end, each conductor bar carries a detachable electrode assembly that comprises a workpiece-contact member. A switch which is part of a low voltage power supply is removably mounted on the handle. Various configurations of electrode assembly are provided comprising different workpiece-contact members, such as a carbon block on each conductor bar, or a contact member on one bar and a ground clamp on the other.

Abstract: A portable spot welder includes a hand-held electrode clamp assembly. The hand-held clamp has a fixed electrode and a movable electrode adapted to be moved toward and away from the fixed electrode. A spring loaded toggle is used to pivot the movable electrode to clamp a workpiece between the electrodes to exert a predetermined and repeatable pressure. The invention includes an air cooling system. Air is forced through the electrical cables connecting the hand-held electrode clamp to the welder transformer. At the hand-held clamp, the air escapes to the atmosphere through passageways near the electrodes, thereby enabling heat generated within the cables and at the electrodes to be transferred to the flowing air.

Abstract: Device and method for welding nuclear fuel assembly structural elements, comprising a receiving stand for the guide tubes and structural elements of the assembly, and a welding group having a carriage movable parallel to the guide tubes comprising at least one welding gun united on the carriage by means enabling it to move parallel to a row of guide tubes and to rotate between an orientation in which the gun can pass between two adjacent rows of guide tubes and an orientation in which it comes to grip a tube at the location of the proposed weld, electrical welding pulses being applied to the guns.

Abstract: A welding gun apparatus having a gun bracket, a pair of arms pivotally mounted on the bracket, a transformer mounted on the bracket, and a pressure applying mechanism on the bracket for opening and closing the gun arms; characterized in that the gun bracket comprises a frame which extends longitudinally from a front pivot portion for pivotally supporting the gun arms to a rear portion, the transformer being positioned in and fixed to the frame between the front pivot portion and the rear portion.

Abstract: A manually operated pincer-gun utilizing electric current for heating metal hinges of a thermoplastic eyeglass frame during a repair operation includes a pair of electrically insulative hand grips, each operatively connected to an arm having an electrically conductive extremity. The hand grips are pivotally connected together such that the hand grips and the respective arms and extremities are movable toward each other. An electrically conductive heating tip and an electrically conductive picking-up tip are provided on the extremity of each arm and the secondary of a step-down transformer controlled by a pedal switch is connected to the respective extremities to supply heating current to the heating and picking-up tips. The heating tips form a pair of pins extending substantially parallel to each other to be able to be placed on the base of the hinge to apply electric heating current thereto to soften the eyeglass frame around the hinge for insertion or extraction of the hinge.

Abstract: The present invention is directed to a gun arm for a resistance welding gun. The gun arm comprises a main body, an electrode holder mounted on the front portion of the main body and a support member fixed to the rear portion of the main body. The main body comprises a conductor member having a water passage on at least one side thereof and a plate member fixed to at least one side of the conductor member and in contact with the water passage. In one embodiment of the present invention, the water passage comprises at least one groove formed in the conductor member with the groove being covered by the plate member. In an alternative embodiment, the water passage comprises at least one pipe which is positioned between the plate members which comprise the at least one plate member.

Abstract: A spot welding gun adapted for use in robotic welding in which the electrode holding arms of the gun are each turnably journalled on an attachment means. One of the electrode holding arms or an operating lever thereof supports a cam member with a cam surface thereon. A pressure roller acts against said cam surface during transport of the welding gun between welding points and thereby holds each electrode holding arm in a respective fixed position relative to the attachment means.

Abstract: Apparatus for resistance welding is provided. The apparatus includes a transformer, to an output face of which resistance welding electrode holders are connected. The output face has two terminal blocks with threaded openings to receive fasteners for several different designs of electrode holders. The welding electrode holders, being directly connected to the transformer, eliminate the usual heavy cables located between the welding electrode holders and the power source, thereby increasing efficiency through reduction of impedance and secondary loss. The transformer and electrode holders are essentially one unit which can also be moved about to different locations. The welding apparatus is also versatile and compact to meet various applications.

Abstract: A transformer for electric welders, especially welders having a welding gun secured to a robot arm, comprises a small lightweight loop core having first and second substantially C-shaped sections abutted together at their free ends with primary and secondary windings coaxially wrapped about one pair of abutting shanks. The secondary winding comprises an elongated flat sheet wrapped around abutting shanks of the core and has projecting tabs extending from opposite sides of the sheet. A primary winding comprising a plurality of coil sections is coaxially wrapped about the secondary winding whereby the secondary winding is substantially entirely coupled to the primary winding. The windings are encapsulated in a dielectric material such as a synthetic polymer resin. The transformer is preferably connected to a high frequency electrical power source.

Abstract: An improved electrical resistance welder which provides the same welding current at the welding electrodes as prior welding device while requiring less input current, and providing lower reactance, less weight and overall increased efficiency. The resistance welder includes a transformer having a pancake type primary winding formed of a metal tube thrugh which a coolant is flowed. Portions of the primary winding are adjacent the transformer secondary and thus the primary winding also functions as a heat sink to cool the secondary.

Abstract: A Robot type resistance welder of very large capacity that enables the electrodes of the welder to be readily adjustable in the welding and retracting strokes and automatically controlled so as to retract when encountering an obstacle - also whereby the degree of retraction of electrodes may be selectively controlled and whereby the vertical elevation of the work plane may be varied during welding in accordance with the contour of the work, such as a curved panel. The respective electrodes of the spot welders have supporting arms which are pivotally interconnected together with an operating air cylinder. An adjustable stop is provided in the air cylinder to adjust the extent of retraction. The entire assembly including the pivotal supporting arms and inter-connected cylinder are provided with an adjustable stop for limiting the pivotal movement of the assembly. Such pivotal movement is cushioned by springs.

Abstract: The resistance welding machine of this invention has an arm carrying a movable electrode and provided with a supporting bore, a power receiving bushing fitted in the supporting bore, and a power feeding shaft mounted on the main body of the welding machine on which a second electrode, is also mounted. The power feeding shaft is received by the bore of the power receiving bush to support the arm while supplying electric power to the movable electrode. A plurality of grooves are formed in the inner peripheral surface of the power receiving bushing to receive powders generated as a result of local wear due to sliding contact between the power feeding shaft and the power receiving bushing. The grooves are filled with grease which adsorbs and holds the powders.

Abstract: An electric work-in-circuit tool has a pair of fiber-reinforced plastic arms connected in tong fashion and limitedly opened by a spring. The free end of each arm has an integral flange apertured to receive bolts for assembling with, and attaching to the arm, a plurality of centrally apertured metal discs which are spaced by metal washers to form a heat-dissipating unit. The heat-dissipating unit spacedly surrounds the rear part of a metallic conductor body which has an axial bore to receive the bared end of an insulated power supply conductor passing axially through each tong arm. The conductor body also has a reduced-diameter front extension supportingly received in either a longitudinal or a transverse bore in the rear end of a metallic electrode holder whereby the electrode holder may be oriented either longitudinally or transversely of the conductor body. Each electrode holder has a longitudinally extending rabbited seat for dove-tailed slidable reception of a tapered carbon electrode-block.

Abstract: An installation for resistance-welding of structural parts, especially in the automotive industry, with a half-tong that is pivotal about an axis and longitudinally displaceable; the half-tong supporting thereon the welding electrode is pivotal about all three coordinate axes.

Abstract: A resistance welder is disclosed which provides the same current at the welding electrodes as comparable resistance welders while requiring less input current. The surprising efficiency of the novel resistance welder permits it to accommodate wide workpieces in a deep throat. The increased demand for power to the welding electrodes, which demand results from the deep throat, is satisfied by the surprising efficiency of the combination of elements utilized in the invention. This invention combines linear transformers, having secondary terminals at extreme linear ends of the transformers, which linear transformers function as part of at least one body member of the welder to provide unexpected efficiency. These uniquely placed linear transformers minimize throat inductance and reduce energy consumption.

Abstract: An electrical resistance welding apparatus for making an integral and homogeneous connection between a terminal and a battery lug accomplished by limiting the area of contact between the two as by equipping the battery with an insulation card which is at least partially disposed between the lug and the terminal. The apparatus presses a portion of the overlapping area of the lug through an opening in the insulation card to make contact over a relatively small area with the terminal by first moving one electrode to contact the terminal and then moving the remaining electrode to contact the lug. The electrode assemblies clamp the lug and terminal together. Current is provided to the electrodes to heat up the area of contact as it is made, thereby melting the lead in the opening in the insulation card. As the lug and terminal are continuously squeezed together, more cold lead flows into the opening where the fusion is taking place.

Abstract: A welding gun for wire spring relays has jaws designed to clamp the wire contact arm with the end of the wire on which the contact is to be welded projecting a predetermined amount through the jaws. Mechanism on the gun brings the contact against the clamped wire (to which it is to be welded) with a predetermined spring pressure, the mechanism increases the pressure between contact and wire by a consistent amount before initiating the welding operation.

Abstract: A light weight spot welding gun has an aluminum gun body with silver plated sockets for fixed and moveable electrodes. The body has cooling water passages communicating with the sockets. To prevent corrosion and clogging of the passages, the passages are nickel plated.

Abstract: A welding gun for replacing the movable contacts of wire spring relays is provided with a pair of jaws relatively movable toward each other to clamp the contact material to the relay arm for welding them together. A manual control member is movable to cause the relative movement over a resilient connection which provides the clamping pressure. The manual control member moves past the point in its travel where clamping is achieved stressing the resilient connection to actuate a switch to initiate the welding cycle. The clamping pressure is thus controlled at the time that welding commences.

Abstract: A portable seam welder comprising a pair of arms pivoted to one another about a pivot axis and a spindle assembly mounted on each arm. Each spindle assembly includes a shaft rotatably mounted about an axis extending generally parallel to the pivot axis and perpendicular to the longitudinal axis of the arm. A welding wheel is mounted on each shaft. At least one of the wheels is driven to rotate it. Handles are mounted on one of the arms for manipulating the welder, and an actuator means extending between the arms for pivoting the arms relative to one another for moving said wheels toward and away from one another.

Abstract: A transformer for application in portable resistance welding machines assembled from toroidal sections of iron core, primary and secondary windings arranged concentrically one with another. The primary is constructed from copper plate modules so as to form a continuous single layer winding of toroidal form in which the separate modules are electron-beam welded one to another in order to form the continuous primary winding. A single turn secondary completely encloses the primary winding and iron core so as to form a compact cylindrical electrical transformer structure. A liquid electrical insulating material is sealed within narrow gaps between iron core, primary winding and secondary winding to allow good thermal transfer from these elements to a cooling medium and at the same time stabilize the relative position of these elements against the dynamic forces developed by the high currents passing through the secondary.

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: A method for the connection of sheet metal panels coated on at least one surface with a layer by the electrical fusion of a metal, wherein the improvement comprises the steps of supplying an electric current for the fusion of metal indirectly along the sheet metal of at least one panel to the zone at which said panels are to be connected to each other, and keeping the temperature of an outer layer of at least one of said panels below the melting point of said layer.