Abstract: The copper wires employed for electrical resistance seam welding of tinned sheet metal with the help of wire electrodes until now had to be taken back to the smelter as old metal after a few applications. The additional operating costs associated with this were until now unavoidable for long seam resistance welding of tinned sheet metal since multiple uses or applications of the copper wire for resistance seam welding have proven to be impossible in spite of years of research. The problem of these additional operating costs can be solved such that new copper wires with a reduced diameter can be directly drawn from the copper wire employed as wire electrodes for resistance seam welding after their use in welding. These wires then, for example, can be used as signal conductors or as windings. The properties of these wires are totally in accord with copper wires that are directly drawn from new copper.
Abstract: A capstan drive assembly for electric arc welding receives filler wire which can have an undetermined cast to the wire. The assembly provides for self feeding of the wire from the inlet completely through to a welding torch. No portion of the assembly must be opened or disassembled to feed the filler wire. The wire is captured in a groove on the periphery of a capstan and held in place by spaced apart pressure rollers which serve to impart a predetermined cast to the filler wire. The predetermined cast overcomes any previous cast which was present in the wire. After the wire has received this cast, it is directed between opposite sides of wire straightening rollers which serve to bend the wire in the opposite direction of the predetermined cast and apply sufficient force to counteract the set cast. This apparatus and procedure results in producing a filler wire which is substantially straight.
Abstract: An apparatus for the automatic soldering of lead pins distributed on a packaged IC chip in bilateral or quadrilateral parallel rows, to corresponding contact pins which are distributed on a substrate printed circuit board in rows corresponding to said rows of lead pins and have preliminarily been pasted with solder. The packaged IC chip is placed on the substrate board, and the packaged IC chip is positioned to align each lead pin in the rows on the packaged IC chip with a corresponding contact pin in the rows on the substrate board. The lead pin together with the contact pin aligned therewith is then exposed to iradiation by a heat ray emitted from a heat ray soldering head and focussed thereon as a line of focus in the form of a segment of a line corresponding to the soldering line.
Abstract: A heater comprising a sheet substrate formed of alumina and an electron-conductive pattern provided thereon and designed to generate heat, in which at least a portion of the electron-conductive pattern is provided thereon with an oxygen ion-conductive layer.
Abstract: A self-regulating heating article comprises a first elongate layer formed by a crystalline polymeric composition of high crystallinity and conductive particles dispersed in the polymeric composition to exhibit a positive temperature coefficient of resistance. A pair of elongate electrodes, which are adapted for connection to a mains supply, are secured one on each surface of the first layer to develop a potential in the direction of thickness of the first layer. The electrodes are arranged so that a creeping distance which is greater than the thickness of the first layer is established between the electrodes along peripheral edges thereof. The creeping distance prevents insulation breakdown and ensures safe, high wattage operation at mains voltages.
December 17, 1985
Date of Patent:
November 8, 1988
Matsushita Electric Industrial Co., Ltd.
Abstract: An electrode roll for an electric resistance seam welding machine comprises a stator substantially made of copper or a copper alloy, a rotor mounted on the periphery of the stator, and substantially or in part made of copper or a copper alloy and rotatably a gap portion formed by the stator and the rotor. A conductive liquid metal, which is a fusible alloy composed mainly of gallium, is inserted in the gap portion through a filling hole and is sealed in the gap portion. At least the portion of the filling hole that may come in contact with the conductive liquid metal is fabricated of a metal or metal alloy which is hard to be corroded by the fusible alloy. The remaining surfaces of both rotor and stator facing the gap portion are covered with a layer or layers of a metal or metal alloy that is hard to be corroded by the fusible alloy. In at least one embodiment, such layer or layers are further covered with another thin layer of metal which has an excellent wettability by the fusible alloy.
Abstract: The electrically weldable sleeve has a tubular sleeve member, heating elements arranged on the inner wall of the sleeve member and terminals for an energy supply. A material recess in the form of slots is provided in the edge zone of the boundary area of the heating element. This makes it possible to completely utilize the shrinkage reserve imparted to the sleeve member during the production of the sleeve, so that it is effective up to the solidification of the core of the melting zone. It also completely compensates for the volume contraction of the material linked with the solidification of the melting zone, so that the occurrence of cavities is reliably avoided. Corresponding to the axial flux of force represented by lines, the material recesses must be located at a point, which leads to no weakening of the sleeve member portions decisive for assembly and operation.
Abstract: Two endless flexible conveying strands (22, 24) run, parallel to one another, over a drive mechanism (26, 28), a guide mechanism (30, 32, 34) and a conveying track for the body blanks (10). The two conveying strands (22, 24) are displaceable in relation to one another to a limited extent in their longitudinal direction in operation. Pusher dogs (46, 48) are secured one behind the other to the conveying strands (22, 24) with equal spacing so that situated opposite each pusher dog (46) on one conveying strand (22) is a pusher dog (48) on the other conveying strand (24) so that these two associated pusher dogs together push a can body blank (10) over the conveying track to a welding apparatus (20). The pusher dogs (46, 48) each have a lateral projection (50, 52). Disposed on the conveying track, upstream of the welding apparatus (20), at a distance from this which coincides at least approximately to the length of the can body blanks (10), is a pair of adjusting templates (62, 64).
Abstract: A method for the production of an electric seam welded steel pipe for oil-well use which has good resistance to collapse pressure and souring, by providing a steel containing 0.08-0.26% C by weight, 0.8-1.9% Mn by weight, 0.5% or less Si by weight, the remainder being Fe and unavoidable impurities, subjecting the steel to hot rolling, and hardening, and coiling the treated steel at a temperature not exceeding 250.degree. C., after which the steel is then formed into tubular form and welded by electric resistance welding to produce an electric seam welded pipe, and the weld heat affected zones of the pipe are subjected to heating to a temperature of 900.degree. C. or more to effect hardening, and then the whole pipe is tempered.
Abstract: Welding tongs for dot or spot welding having two arms which are disposed without crossing relationship and carrying weld electrodes respectively on one end. The arms are made of flat, spaced bars, and a substantially flat spacing member made of an elastic or resilient material, spaces the two arms from each other thereby interconnecting the tong arms in a range of pivot motion of the arms. An E-shaped mounting member limits lateral deflection of the tong arms and holds the spacing member. A hydraulic drive is connected to the other ends of the tong arms for obtaining the pivot motion of the arms in relation to each other, through tensioning and upsetting or compression of the spacing member.
Abstract: An easily replaceable ventilated external insulator for a tungsten inert gas, plasma, or similar welding torch comprises a generally cylindrical member molded from a resilient heat resistant electrical material such as a silicone rubber. The inner wall of the insulator has a plurality of parallel alternating grooves and lands. The grooves communicate at each end with circumferential grooves which act as manifolds. At least one of these circumferential grooves has a vent to release to the atmosphere any gases formed between the insulator and the body of the torch head during welding operations. The vent is located so that these gases are directed away from the weld zone and do not act to contaminate the welding atmospehre.
Abstract: An electric resistance welding apparatus is shown for attaching insulation to duct work comprising a supporting anvil with a surface for supporting a sheet metal duct work with a covering sheet of insulating material and a movable hammer member spaced from and movable relative to the anvil. The hammer member has one or more magnets for supporting a resistance welding pin and is movable to drive the pin through the insulating material to engage the sheet metal duct work. The hammer member and anvil are connected in an electric welding circuit to supply current from the hammer through the pin to the anvil to fuse the end of the pin to the sheet metal with the head of the pin holding a washer tightly against the insulating material. The hammer member and anvil are both copper with recesses having cylindrical copper electrode members removably positioned therein. In one embodiment, the hammer member recess is deeper than the copper electrode member, and the magnet fits the recess behind the electrode member.
Abstract: An automatic tab plate welding apparatus welds a tab plate to the predetermined corner of a plate. A tab plate table supports the tab plate and determines the position of the tab plate relative to the forward direction of the plate, the widthwise direction of the plate, the vertical direction of the top surface of the plate, and the angle of inclination to the top surface of the plate. A welding torch is also positioned in operative association with the positioning of the plate described above.
March 9, 1987
Date of Patent:
August 16, 1988
Sumitomo Metal Industries, Ltd., Osaka Fujikogyo Co., Ltd.
Abstract: The welding of the body and of the ring with the distributor of a steam turbine diaphragm is carried out in four different areas holding an assembly, formed by two semi-diaphragms, in a substantially vertical position, at most tilted a few degrees off vertical, while four welding units operate simultaneously, two for each face of the assembly, providing for each assembly face to be suitably heated. Two supports are provided, one movable in respect to the other for positioning and handling of the assembly to be treated. Provision is made for vertically adjusting the assembly position with respect to a referring surface, so that the area on which each welding unit works is always on the same level, whatever the dimensions of the assembly to be welded. Provision is also made for heating and insulating both the assembly faces.
Abstract: An electrode holder for conducting welding current from a power source via a base plate, a hollow body, and an electrode shaft which is slidably supported within and projects outwardly of the hollow body. The shaft has an enlarged head axially slidably supported within the hollow body and carrying thereon an electrical contact structure which is spring-urged for uniform slidable contact with both the head and the hollow body to effect efficient and uniform transfer of current therebetween. The head has channel-like recesses extending transversely on opposite sides thereof, and an identical contact structure is associated with each recess. The contact structure, in the preferred embodiment, includes a pair of contact blocks disposed adjacent opposite sides of the respective recess and spring-urged apart so that oppositely directed side surfaces on the blocks are slidably engaged with opposite side surfaces of the head to define a current transfer path.
Abstract: A machine for setting eyelets and the like in printed circuit boards includes a generally U-shaped frame having a pair of spaced-apart support arms defining a workpiece receiving zone therebetween, a first tool movably mounted in one of the support arms, and a second tool fixedly mounted in the other support arm and axially aligned with the first tool. An adjustable torque screw is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre-determined eyelet setting pressure. The adjustable torque screw insures that the eyelet setting pressure does not exceed the pre-determined eyelet setting pressure despite continued rotation of the adjustable torque screw.
November 3, 1986
Date of Patent:
July 26, 1988
Frank Sylvia, Francis V. Bugg, John B. Holdway
Abstract: A male spot welding electrode includes a weld end portion having a generally flat contact surface and a tapered mounting portion containing an inlet bore. The inlet bore communicates with an internal cavity, containing cooling fins, for coolant fluid flow. The diameter of the internal cavity is made larger than the diameter of the inlet bore in order to maximize the cooling surface for the dissipation of heat generated during repeated welding operations. The male spot welding electrode is produced from a single billet of copper material through a process of back-extrusion and swaging.
Abstract: A method of cladding a steel roll, such as a felt roll with a non-corrosive shell, ensures that the shell is tightly fitted to the core and is free to expand and contract on the core to avoid distortion problems. The method comprises the steps of preparing two stainless steel shells each having a length equivalent to the circumference of the core plus a predetermined extra, wrapping the shells about the core, side by side, leaving a predetermined circumferential gap between the shells, heating and clamping the shells tightly around the core until the longitudinal joints each attain a predetermined longitudinal gap, welding the longitudinal gaps, and circumferential gap between the shells while the shells are hot, ensuring the sheets are welded together and not welded to the core.
Abstract: A machine for forming parallel corrugations in a metal sheet and for welding each of these corrugations at its longitudinal end, comprises, on the metal sheet side, a bending die comprising two plates perpendicular to the metal sheet defining therebetween a space in which may be engaged a punch or knife perpendicular to the metal sheet. The bending die has, at each of its two lateral ends and on the internal faces opposite its parallel plates, a pair of bending members projecting from the internal faces of the two parallel plates of the die. These two bending members define therebetween a gap substantially equal to twice the thickness of the metal sheet. A welding torch is carried by the bending die and ensures welding of the two lips of the metal sheet in the immediate vicinity of the zone where they are nipped between the bending members.
Abstract: A projection welder for welding a nut to one side of a work has a movable upper electrode and a stationary lower electrode provided with a removable electrode tip for receiving and holding thereon the nut against which the work is urged by the upper electrode so that the work and the nut are welded together. A tubular nut-centering pin projects upwardly from the upper surface of the electrode tip and is axially aligned with the upper and lower electrodes to receive the nut such that the pin engages with a threaded hole in the nut whereby the nut thus received on the nut-centering pin is centered relative to the upper and lower electrodes. The nut-centering pin has an axial through-hole connected to an air source under pressure so that air can be fed under pressure to portions of the work and nut being welded.
March 9, 1987
Date of Patent:
June 28, 1988
Toyota Jidosha Kabushiki, Yajima Kogyo, Inc.