Abstract: A method of manufacturing a support panel forming a display unit and a panel obtained by means of this method, comprising strips (1) made from metal sheet, which are individually subjected to successive forming operations so as to give them a profile whereby, in the transverse direction along the length of the strips, ends (4, 5) are disposed substantially in the same plane and are separated from each other by an intermediate projecting portion which is connected to one of the ends by an S portion. To form the panel, one end (5) of a strip (1) is applied, over the whole of its length, against the opposite end (4) of the preceding strip (1) and is spot welded.

Abstract: A screen basket comprising a plurality of rods each positioned approximately parallel to the rotational symmetrical axis of the basket, a plurality of rings for connecting the plurality of rods, wherein the plurality of rods form screen slots therebetween, and wherein the plurality of rods is fastened to the plurality of rings by either welding or soldering. Each rod has a cross-section and each of said plurality of rings has a recess in the shape of the section of the cross-section of the plurality of rods. The recess is adapted to receive the plurality of rods therein.

Abstract: A method of reparing a worn flight bar is accomplished by first removing by torch cutting the worn ends of the flight bar. Replacement endpieces having an outer surface profile matching that of a new flight bar and an inner face configured to match the cut face of the flight bar ends are secured thereto by welding. Each profiled replacement endpiece is preferably formed by drop forging and contains welding chamfers and seating lands formed around the inner face thereof to insure strong weld joints and reproducible dimensional accuracy.

Abstract: Strip joining apparatus for joining the ends of two metal strips in overlapping relation includes a shear assembly mounted for indexing movement from a remote location to a first shear position for shearing an end of one of the strips and a second position for shearing an end of antoher strip which is located further from the remote location than the first shear position by a distance corresponding to the desired overlap between the sheared strip ends. Different gauging or stop surfaces are used for locating the shear assembly in the first and second shear positions. Also, the end of the strip that is sheared at the first shear position is moved out of the way during movement of the shear to the second shear position so as not to interfere with the shearing of the other stirp at the second shear position.

Abstract: In a method of producing a movable part of a wire-dot print head comprising an armature supported by a plate spring, and a lever having a tip to which print wire is fixed, the armature and the lever are formed of alloys containing identical atoms or alloys easy to diffuse into each other, a bond part of a base part of the lever is inserted in a bond groove in a tip of the armature, and the lever and the armature are heat-treated in vacuum at a temperature not lower than 1100.degree. C. and below the melting points of the lever and the armature, so that the lever and the armature are diffusion-bonded.

Abstract: A method of fabricating light-weight sections consisting in uncoiling a strip (20), levelling it, slitting it in a zigzag course into at least two members (5, 6, 7), changing the path of travel of at least one member, matching the members (5, 6, 7) at the edges in the same plane so as to obtain units with an alternating cross-sectional area, and welding units together.

Abstract: A method for converting the angulate form boom of a digging machine such as a backhoe or the like into a substantially straight lifting boom. The original angulate form boom is separated into two parts in the vicinity of the angular transition and is realigned so that the top sides are substantially co-planar. A union then is formed to rejoin the separated portion. By initially separating the boom with an elongate parting locus passing near the lifting point of the original boom, and the employment of elongate top and bottom plates, improved structural integrity is achieved and an advantageous shifting of the lifting point to the bottom of the resultant lifting boom is realized.

Abstract: Dies for extruding honeycomb structures are disclosed, which comprise wear resistant alloy plates, a die base body having a coefficient of thermal expansion different from that of the wear resistant alloy plates, forming channels having a sectional shape conforming to that of honeycomb structural bodies to be extruded and a given depth from a front face of the die toward a rear face thereof, and a plurality of opening holes independently formed from the die near face toward the die front face and communicating with the forming channels. The die base body and the wear resistant alloy plates are bonded together such that the forming channels may communicate with the opening holes. A method for producing such dies is also disclosed, which is characterized in that slits are preliminarily formed in one of machined faces of the die base before the wear resistive alloy plates are bonded to the die base portion, and are located at a predetermined width in an arrangement conforming to the forming channels.

Abstract: A method for replacing a damaged or defective section of a length of original piping or tubing located within a structrue such as the turbine of a jet engine wherein access to the tubing is limited, and replacing such damaged section with a new section of tubing comprises inserting a cutter mounted at one end of a flexible shaft into the interior of the original tubing and rotating the shaft to cut out and remove the damaged section of tubing leaving at least one stub section of original tubing. The stub sections of original tubing are then prepared for welding or brazing to a section of replacement tubing with a series of tools each mounted to an elongated shaft. These tools include a chamfering tool, a deburring tool, and a polishing tool.

Abstract: A method, for butt-welding steel strips using a laser beam are disclosed, in which opposite ends of preceding and succeeding steel strips fed continuously are cut and the cut end edges thus formed are welded by butt welding using a laser. The cutting and butting at the time of welding are effected with one edge of the preceding steel strips adjacent to the opposite ends of the succeeding steel strips aligned to be parallel with the center line of travel of the continuous processing line. When effecting the alignment, the preceding or succeeding steel strip is attracted by an electromagnetic chuck on a work table in the continuous processing line and is pulled by the chuck toward a reference block provided with an alignment edge parallel to the center line of travel of the processing line to bring the edge of the sheet into contact with the reference block. The alignment is done in this state.

Abstract: A flat prefabricated panel formed from a three-dimensional metal screen and from a reference layer of foamed plastic is converted into a curved panel suitable for the formation of a curved wall by cutting said screen along parallel lines on one face of the panel, utilizing said cut line to incurvate the panel to make the opposite face thereof concave and finally restoring the integrity of the screen on said face of the panel by means of reticular connecting strips applied along said cutting lines.

Abstract: An electronic component with lead terminals, includes an electronic component element, electrodes respectively formed on opposite end faces of the electronic component element, and lead terminals respectively connected to the electrodes for electrical conduction, and each of the lead terminals having a large width portion formed at one end of its small width tip portion, and the large width portions of the lead terminals being conductively connected to the electrodes of the electronic component element. The disclosure is also directed to a method of manufacturing such electronic component.

Abstract: The invention concerns a process for assembly of the end of a girder (16,18',18",20', 20"and the associated region of a crossbrace (10,12), constituting components of the chassis end of a railway vehicle, with the girder and crossbrace each comprising at least one vertical web and upper and lower flanges. According to the invention, the flanges of the girder are cut away such that its web extends longitudinally beyong the edges of the flanges. Then the flanges of the crossbrace are cut so as to form attachment journals with free edges adapted to the respective free edges of the flanges of the girder, at the same time, forming in the region of the free edges, hook-shaped lateral appendages. The crossbrace and girder are positioned so that the respective free edges of the flanges of the crossbrace and the girder essentially abut one another, and the girder and crossbrace are welded together in the regions of mutual contact.

Abstract: An air conditioner condenser manifold uses a tube having a flat side and a semi-oval cross-sectional shape, with holes pierced into the flat side of the tube without removing any material from the tube. The material of the flat side of the tube within an indentation around each of the holes is formed into a cylindrical collar recessed into the tube and having an inside axial length longer than the unpierced thickness of the tube. The ends of smaller tubes are bonded into each of the collars so that bonding material is disposed in the indentations around the holes.

Abstract: In a method of building an automobile body separate upper and lower body modules (50, 78) are formed, incorporating the roof area and the floor area of the automobile respectively, precision mating locations (62) on the body modules are used first as reference for fitting interior parts and equipment to the respective modules and then for fitting the modules together. An assembly line for carrying out the method has respective sets of stations for forming operations on upper and lower body modules, a mating station (30) at which the two modules are brought together and a joining station (32) where they are, for example, welded. The leading station (20, 22) in each set determines a master body point (64, 82) on a module presented to it, and forms the mating locations (62) on the module with reference to the master body point.

Abstract: A method for depositing gold bumps on metallized pads of semiconductor chips uses a commercially available thermocompression or thermosonic gold wire bonder. The method includes the steps of depositing a gold ball with an attached wire on the metallized pad, and removing the wire so that a gold bump remains on the pad.

Abstract: When joining tubular steel lattice members in a space structure, which is built up over box-shaped modules, and where the members (1,5) are joined in the corners of the box-shaped modules under formation of lattice nodes (4), elliptical assembling devices (6,12) are used. The elliptical assembling devices consist of two elliptical plate pieces (7,8) which are placed at right angles to each other with a mutual minor axis. The devices lie with their side backing to member ends, which are cut into plane sections at an angle of 45.degree. with the member axis.

Abstract: A blade fuse includes parallel blades (12 and 14) secured in a body (16). A fusible link (42) welded to the blades is located in a cavity (20) of the body that is covered by a window (61). The blade fuses are assembled by blanking the fusible element from a ribbon (90) and translating it into a fuse subassembly (64). Tabs (50 and 52) secure the fusible element in the subassembly (64) until it is spot welded to blades 12 and 14. The window (61) is then blanked and translated to cover cavity (20) and secured by ultrasonic welding. A connector strip (76) is then blanked from between blades (12 and 14) to provide the blade fuse.

Abstract: A method is described for the manufacture of articles in defect-immunized materials in which the defects are eliminated, or broken up and oriented in such manner as to minimize their harmful effects on the article.Referring to FIG. 1e, a rotor disc for a gas turbine engine is formed to an approximate shape by stacking together "sticks" 5 of material in an evacuated container and bonding them together by a hot isostatic pressing process. The "sticks" 5 are produced by extruding a starting body, for example, of powder material, to produce an elongation of up to twenty times and then cutting them to the appropriate length. By this means any non-metallic inclusions in the powder are broken up, inspection of the sticks and rejection of defective ones becomes easier, and the sticks can be oriented so that the effects of any remaining defects can be minimized.

Abstract: A process is disclosed for the manufacture of semi-finished polychrome composites from thin gage metals by pressing at least one first thin gage metal to create obverse and reverse sockets, then punching first and second inlays from at least one second metal having a gage equal to the depth of such sockets; before the inlays are located in their respective sockets and made fast, the surfaces to be brought into contact are roughened by micromachining, and the components are immersed in a chemical solution of antioxidant and volatile medium; a final step of the process, preferably, would consist in superfinishing the surfaces. A thin gage semi-finished composite articles both faces of which exhibit a polychrome design is obtained.

Abstract: A method is provided for manufacturing a heat shield for an exhaust system component. The exhaust system component preferably is of tubular nonlinear configuration. The heat shield is formed from a larger pipe having an internal diameter greater than the outer diameter of the exhaust system component. Appropriately dimensioned inwardly directed supports are formed in the larger pipe. The larger pipe then is bent into a nonlinear configuration substantially identical to the configuration of the exhaust system component. The outer pipe then is cut longitudinally in half along its entire length to define a unitary nonlinear heat shield which can be mounted to the exhaust system component. A portion of the remaining half of the larger pipe can be reattached to the heat shield to provide an air gap pipe along a portion of the length of the exhaust system component.

Abstract: Repair or replacement of a projection such as a labyrinth seal tooth of a metal having relatively poor weldability characteristics is accomplished by removing a portion or possibly all of the seal tooth down to a pedestal and then metallurgically bonding as by fusing to the pedestal a second metal characterized as having good weldability characteristics when diluted with the first metal, and age hardenable with an aging heat treatment with which the first metal also is age hardenable.

Abstract: Semiautomatic threading of bonding wire into the guide hole of a wire bonding tool is accomplished by holding the end of the wire in a reference position while its standing part is disposed in the wire feed mechanism of the machine and by activating the feed mechanism after the tool and work positioning mechanism of the machine have placed the bonding tool in line with the wire proximate to the wire end. A preferred apparatus for holding the end of the wire in place is a structure which forms a ledge and has a notch in the edge of that ledge.

Abstract: An electron gun comprises, as in prior guns, a plurality of metal gun elements, held in position from a common ceramic member. A novel transition member is brazed to the common ceramic member. The transition member has a contact portion and a removable frame portion. The transition member is a bimetal comprising two layers of metal bonded face-to-face along an interface extending therebetween. A first layer of metal has a melting point higher than that of a second layer of metal.The novel transition member is provided with a V-notched weakened bridge region extending through the first layer of metal and terminating at the interface with the second layer of metal having the lower melting point. The frame portion of the transition member is removed from the contact portion at the V-notched bridge region when the transition member is brazed to the common ceramic member and the second layer of metal melts. The contact portion has a substantially smooth edge following removal of the frame portion.

Abstract: A process and apparatus for fabricating an optical fiber communication cable are described herein. The optical fiber cable has a cable core including a metal containment tube and at least one optical fiber within the tube. The containment tube preferably is formed by drawing a strip of metal through at least one forming die. In a first aspect of the present invention, smooth operation of the forming die is promoted by first passing the metal strip through a shaving die to remove any shearing burrs along the strip edges and to maintain the width of the strip within a desired tolerance.In a second aspect of the present invention, various approaches for effectively sealing the containment tube are described. In a first embodiment, the tube is sealed using a wave soldering approach wherein a flow of moving molten solder is used to substantially fill a seam in the tube.

Abstract: An improved burnishing method suitable for planarizing bonding pads on fragile semiconductor devices is disclosed. The method comprises imparting scratches of predetermined depth and spacing onto a glass slide. The bonding pad surface is contacted to the scratched glass surface under a desired pressure and a relative motion is established therebetween. The motion is continued until a smooth, defect-free bonding pad surface has been provided.

Abstract: A portable apparatus for friction joining metal pieces to an electrical conductor while the conductor is carrying electrical current. The apparatus comprises a spindle adapted to receive and to hold a metal piece in a forward end thereof for rotation against the conductor, and structure is provided for translating the spindle toward and away from the conductor. An air operated motor and flywheel are provided for rotating the spindle, and structure is provided for supporting the apparatus on the conductor.

Abstract: An air gap pipe and a method for forming the same are provided. The air gap pipe includes a non-linear outer pipe and an inner pipe of identical configuration disposed concentrically within the outer pipe. The inner pipe is supported by resilient dimples in the outer pipe. The outer pipe is placed in a condition for receiving the inner pipe by longitudinally cutting the outer pipe in half with a pre-programmed plasma arc or laser cutting apparatus. The two halves of the outer pipe are secured together to provide vents, if necessary, for selective dissipation of heat.

Abstract: The method comprises the steps of: digging out a continuous groove (13) in the wall of the tubing at the location of the tapping point to be made, said groove being slightly shallower than the thickness of the wall, thereby leaving a membrane (14) of metal at the bottom of the groove between the inside of the tubing and the outside atmosphere; placing a sealed isolation unit on the tubing, said unit covering a wide area which is at least equal to the area delimited by the groove; breaking the metal membrane so as to make an opening in the wall of the tubing; removing the cut out portion of the wall; welding on a blind tail pipe; and removing the sealed isolation unit. The invention also provides a groove-digging device, and a membrane-breaking punch device (600).

Abstract: A method of forming tapered tubes for use as utility poles and the like comprises the steps of making a pair of cuts generally lengthwise of a cylindrical tube on opposite sides of the tube but offset at one end from a common diameter the same distance in the same direction and slanting the cuts so that at the other end of the tube they are on the opposite side of the same diameter, leaving a pair of tube halves having a small arc and a large arc at each end, reversing one of the tube halves to place both small arcs at one end and both large arcs at the other end, welding the halves to each other along the cut edges, and pressing the resultant tube to substantially circular cross section.

Abstract: An improved method of producing a scroll type compressor having an orbital scroll member and a stationary scroll member. The orbital scroll member is fabricated by a process comprising the steps of: forming an end plate and a spiral wrap separately, the end plate being composed of an upper half part having a discontinuous joining portion for joining the spiral wrap and a lower half part having an oil passage. The upper half part and the lower half part of the end plate are fixed to each other through mutual engagement between locating projections formed by a plastic work on one of the half parts and mating holes formed in the other of the half parts.

Abstract: A clevis end connecting rod such as a truck lever connection rod, brake cylinder push rod, brake rod end, etc., utilized on railroad cars and the like, is manufactured by forming a piece of straight metal bar stock with a central offset and then transversely severing the bar stock at the central portion of the offset and then realigning the severed bar ends with each other to form a bifurcated jaw having laterally spaced side portions merging to contact at their offset ends with their surfaces of severance lying in a common plane. One end of an elongated piece of metal stock is butted up against the severed end surfaces and there welded. Aligned bores are provided in the bifurcated arms to receive a common connecting pin therethrough.

Abstract: A bipolar diaphragm or membrane electrolyzer comprising a housing containing an end anode element, an end cathode element and a plurality of bipolar elements with their major dimensions lying in a substantially vertical plane and comprised of a bipolar wall separating the anode compartment and the cathode compartment and vertical foraminous electrodes parallel positioned a certain distance from the bipolar wall, diaphragms or membranes separating the anodes and cathodes, a series of baffles distributed along the entire width of the electrode compartment and extending from the bipolar wall to the foraminous electrode to form a series of vertical flow channels extending over a large portion of the height of the wall, the said baffles being alternately inclined one way and the other way with respect to the vertical plane normal to the bipolar wall plane and spaced from one another whereby the ratio of the electrode surface intercepted by the edges of two baffles laterally defining a vertical flow channel to the

Abstract: A resilient plastic web exhibiting a fiber-like appearance and tactile impression and method and apparatus for its manufacture. In a preferred embodiment, the web exhibits a three-dimensional microstructure comprising a regulated continuum of debossed areas of non-uniform cross-section along their length. In a particularly preferred embodiment, the debossed areas comprise capillary networks interconnecting the first and second surfaces of the web, said networks being of decreasing size in the direction of said second surface to promote fluid transport from the first surface of the web to the second surface and inhibit the flow of fluid in the reverse direction. Forming surfaces utilized to produce said webs are constructed by laminating a multiplicity of thin plates having patterns of apertures therein to form an integral structure exhibiting properties and characteristics unachievable by prior art machining and weaving techniques.

Abstract: A drill pipe comprises a tube, a tool joint at each end of the tube, each tool joint having a larger outer diameter than the tube, a fractured sleeve having an internal diameter smaller than the external diameter of the tool joints but slightly larger than the outer diameter of the tube welded together about the tube, and adhesive cement between the sleeve and tube affixing the sleeve to the tube. The sleeve is fractured by forming a plurality of external longitudinal grooves therein not in excess of 180 degrees apart circumferentially, cooling the sleeve to at least the ductile-brittle transition temperature, placing the sleeve on a split tubular internally tapered mandrel, and forcing a wedge into the mandrel with a hammer blow to fracture the sleeve along said grooves into a plurality of segments.

Abstract: A compression mold includes punch and cavity components fabricated from initially flat sheets of relatively thin metal. The sheets of each component are shaped, assembled and joined to provide box-like components defining mating mold surfaces yielding molded parts which may be straight or laterally and/or vertically curved. The hollow interior of the two components allows for the circulation therethrough of an appropriate heat transfer medium to permit molding of either thermosetting or thermoplastic compounds.

Abstract: In accordance with a preferred embodiment, a monolith extrusion die is formed by separately drilling matching feed holes for extruded material in each of two plates. In one plate the feed holes are shallow and carefully drilled for accurate alignment with the extrusion slots of the die. In the other plate, the holes are accurately located at the drill entry point, but thereafter rapidly drilled without regard to drift. The plates are then bonded together to form my die.Other methods of forming an extrusion die using two plates are disclosed.

Abstract: This invention relates to a method of making a drill string stabilizer such as a drill collar stabilizer. It includes the steps of providing a length of drill string or drill collar as the body of the stabilizer. There is also provided a cylindrical section of a thick-walled tubing having an inside diameter matching the outside diameter of the stabilizer body. A plurality of helical and elongated sections from the cylindrical section of tubing are cut to form a plurality of spiral blades. These blades are attached as by welding to the body of said stabilizer in a circumferentially generally equally spaced row thereabout. The cylindrical section of tubing is selected to have a predetermined outside diameter such that the blades will have a predetermined radial thickness when attached to the body. In addition each of the blades may be provided with a tapered end surface so as to facilitate running of the tool in the well bore.

Abstract: A method of repairing the housing of a control rod driving system of a nuclear reactor, the housing being inserted through the wall of a pressure vessel of the reactor into a cylindrical sleeve secured to the inner surface of the vessel, which housing is jointed by welding to the cylindrical sleeve. The method comprises the steps of: cutting the housing in the circumferential direction of the housing at a position defined between the weld joint and the inner surface of the reactor vessel and surrounded by the cylindrical sleeve, thereby to divide the housing into a first housing part still attaching to the weld joint and another removable housing part; removing the removable other housing part; inserting a second housing part into said cylindrical sleeve through the wall of the nuclear reactor vessel; and uniting the first housing part and the second housing part by welding thereby to form a new housing for the control rod driving system.

Abstract: A method of forming a flat plate swing valve shell from a commercially available forged or swaged pressure vessel head having circular sections in horizontal planes and elliptic sections in vertical planes. The shell is formed by cutting the head along a vertical axis to form two halves, rotating the halves outwardly with respect to each other and repositioning them so their original base edges are juxtaposed and the two halves form a continuous enclosure having an open base and which has elliptic sections in both vertical and horizontal planes, and welding the two halves along said base edges to form a unitary valve shell.

Abstract: A method of forming a laminated wall for a feeder for supplying molten streams of glass to be attenuated into filaments comprising: providing a refractory metal core; providing oxygen impervious, precious metal sheathing material around said core, said sheathing material and said core having a plurality of apertures extending therethrough; inserting oxygen impervious, precious metal elements into said apertures to form a loose assembly; and hot isostatically pressing said assembly to form said laminated wall having an oxygen impervious, precious metal sheath and inserts intimately bonded thereto.

Abstract: A new wire bonding capillary design is employed in which the bonding and cutting surfaces of the bonding capillary are separated. The bonding capillary tip has an annular bonding surface and an annular cutting ridge raised from the bonding surface and of smaller diameter.

Abstract: A double wrap brake band is manufactured from three substantially equal length strips of metal which are bonded together in a "Y" or tuning fork shape. The bonded straps are then formed into a cylindrical shape and friction material is bonded to the inner surfaces. Operating lugs are secured at the outer free end of each strap. In the alternative, the operating lugs can be formed integral with the strap or otherwise secured to the strap either prior to or subsequent to the bonding of the straps. The lugs can be formed integral with their respective strap by deformation of the strap material. The double wrap band can also be manufactured by assembling three pre-shaped hoop members. The hoops are assembled coaxially and have an open face which is angularly displaced from the hoop adjacent thereto. The adjacent hoops are secured by welding or using a tie bar at the adjacent surfaces between the open ends.

Abstract: Contact pads (18) of a device (12) are adapted for bonding components such as contacts of a circuit assembly thereto. At least two of the pads (18) are interconnected with a member (34) containing bonding material. Portions of the member (34) lying adjacent the pads (18) are then removed to form isolated bodies (42) containing bonding material on the pads (18). The member (37) may be of a composite structure containing bonding material associated with a hard element (61). The bodies (42) formed therefrom contain a hard element portion (62) having dimensions which remain substantially unchanged to define a desired minimum distance between respective pads (18) and contacts when they are bonded together.

Abstract: An automated welding system takes initially randomly oriented negative glow lamps and welds a resistor to each lamp. Lead wires are trimmed to desired lengths and the physical strength of the weld between the lamp and the resistor is tested.

Abstract: An improved mitered joint construction for connecting together mitered ends of two tubular members. One leg of an angled insert having two legs is welded to the interior of one of the tubular members and the other insert leg is trimmed and pressed into the other tubular member to hold the members at a desired angle. The members are then welded together only along the inside edge of the joint. For tubular members having a square cross section, two of the inserts hold the members together at the joint.

Abstract: A system of composition, apparatuses and process provides for a rapid and reliable development and location of a web fabric structure to position and hold each member of a closely spaced assembly of positioned but not electrically connected units comprising discrete electrical components and integrated circuits in place on a printed circuit board with the external leads or connectors of such units projecting through holes in such circuit board so that such units are held to the circuit board during soldering of those leads to the conductive portions of the printed circuit board and other manipulations. The fabric structure and a coacting masking agent are of such chemical composition that they are readily completely removed from the circuit board and from the units after need for such fabric and masking agent has passed.

Abstract: A container includes two elongate tubular members, one telescoped within the other. The inner tube has an access opening in one section of an upper wall portion through which articles can be placed into and removed from the interior of the tube when the inner tube is withdrawn from the outer tube, the access opening being effectively closed when the inner tube is again telescoped into the outer tube.

Abstract: An annular tank for storing nuclear reaction material in an annular space formed among seamless upper and lower annular dies disposed elevationally in a predetermined space and inner and outer sheaths extended on the inner and outer peripheral surfaces of the upper and lower dies. The tank avoids thermal strain and deformation by forming the upper and lower dies in a seamless manner to thus enhance the heat dissipating effect together with high working accuracy and strength. The method of fabricating the annular tank is simple by omitting the use of jigs for welding the segments with less loss and high production yield.

Abstract: The disclosure concerns a procedure for replacing a worn bolster ring on a freight car truck bolster which utilizes a motorized circle cutting and welding machine which rests upon the bolster and is centered by supporting structure positioned by locating pins which engage two pairs of mounting holes for the side bearing cages. The worn ring is cut from the bolster by a cutting torch driven around the circumference of the ring by the motorized machine. Then, the replacement ring is placed on the cut bolster surface, centered with respect to the axis of the motorized machine and tack welded, and finally welded to the bolster by a welding head which traverses the inner and outer peripheral surfaces of the ring under the control of the motorized machine.