Abstract: A plate of a battery is positioned so that a strap connected to the plate is located on a side of the plate, and a pedestal of a resin-wrapped post is fit in a notch formed in the strap. A first protection plate is installed between a contact portion of the pedestal with the notch and a resin portion of the resin-wrapped post, and a second protection plate is installed between the contact portion and the plate. A flame of a burner is applied onto the contact portion from above the strap and the pedestal at a spot between the both protection plates so as to weld the pedestal to the strap without causing the resin portion to become molten or the post from becoming misshapen.

Abstract: Methods of preparing a sputter target/backing plate assembly and assemblies so prepared are disclosed. The methods comprise forming a plurality of grooves in one of the metal surfaces to be joined in the bonding process. The grooves are each provided in a closed, loop configuration or pattern. The target and backing plate to be bonded are adjacently positioned to form an assembly with the grooved surface forming one of the interfacial joint surfaces. The assembly is then placed in a controlled atmosphere, such as a vacuum, heated to a temperature just below the melting point of the lower melting metal to be joined, and pressed until the grooves are substantially filled with metal or alloy from the other, non-grooved interfacial surface.

Abstract: A method of inhibiting shrinkage related cracking of a weld joint during a weld solidification process comprising the steps of: applying a power beam against abutting surfaces of metal pieces to be welded with an intensity sufficient to cause a predetermined portion of the metal on the pieces to become molten thereby producing the weld joint from the coalescense of metals; and modifying at least one of the metal pieces in an area immediately adjacent and extending along the abutting surfaces to allow weld joint volume to transmute during weld solidification and thereby compensate for and inhibit formation of shrinkage related cracking of the weld joint. Another aspect of this invention relates to the welded assembly resulting from such process. Such welded assembly comprises at least two metal pieces with one metal piece having a relatively narrow ligament extending therefrom in an abutting relationship with a surface on the other metal piece.

Abstract: Method for producing a composite pipe made of material which is resistant to an internal and/or external environment at a specific internal and/or external temperature and a specific internal and/or external pressure, the pipe being provided with a reinforcement made of material which at very high temperatures is resistant to compressive and tensile forces occurring during the use of the composite pipe, which reinforcement is provided with a diffusion barrier, wherein the reinforcement provided with a diffusion barrier is applied by welding or fusing to the outside of the pipe.

Abstract: An upper control arm for a vehicle suspension system having a modulus section of hollow construction for reduced weight. The modulus section of the control arm is of a stamped and welded construction thereby eliminating material weight while reducing the cost of manufacturing. The modulus section has a substantially triangular configuration with a reinforced rim flange along the high compression stress area of the control arm elbow. The reinforced rim flange improves the strength of the control arm without sacrificing the weight reduction provided by the hollow construction. A series of apertures are formed in the control arm to reduce weight and improve the harmonic resonancy of the control arm.

Abstract: A method is disclosed for producing an electric deposition foil producing drum for producing an electrically deposited metallic foil having a high quality. An opening tip end portion (14) opened toward the inside is formed in an inner surface portion of a joint portion (13) of an outer skin (12) made from a planar material in the form of a cylinder. The opening end portion (14) is welded from inside, and subsequently, the welded portion (15) and a portion close to the welded portion are bulged outwardly. A layer is welded in a recess (17) formed by the bulging work while cooling the outer surface of the outer skin. Subsequently, the welded layer is peened under a hot or cold work. Subsequently, the peened portion (18) is annealed. It is possible to obtain further advantages by using a welding means which does not require a welding rod for the welding of the joint portion (13).

Abstract: Leakage of fluid from a heat exchanger and fluid mixing in the case of a two fluid compact high intensity cooling heat exchanger are prevented by diffusion bonded areas of the heat exchanger formed using small locally raised borders which extend about the fluid passage or passages of the heat exchanger to form raised contact portions that experience locally high stresses during diffusion bonding thereby insuring material flow and complete bonding. The thickness of the locally raised borders is the same as or slightly greater than the tolerance of the rolled sheet material used to form the laminates of the heat exchanger whereby local deviations in thickness of the thin laminates will not result in non-bonded areas.

Abstract: The thermal expansion of parts to be welded to each other is reduced in that one or more of the parts are modified to include expansion slots in the welding area. This limits thermal expansion to the remaining small areas only which are allowed to expand within the slots. Total expansion of such welded parts is thus reduced after solidfication. In most applications, such slots do not effect the total design of the welded parts. If required, such slots can be sealed after welding.

Abstract: A process for treating the surface of solid fusible solder supported on a substrate, comprises a heated tool having a treatment surface with a selected shape. The heated tool is brought into contact with the solder for fusing the solder to reshape the surface of the solder. The tool is allowed to cool to permit the solder to resolidify, and when withdrawn from the solder, leaving the imprinted shape. The treatment surface is made of material which is not wettable by the solder. Stops may be utilized for limiting movement between the tool and the substrate to a specified gap for the treatment surface.

Abstract: A method of applying corrosion resistant liners to the structural steel walls of flue gas lines, flue gas treating apparatus, scrubbers and the like. The wall to be protected is provided with spaced apart bores and the liner sheets are applied to the inner surface of the structural steel wall. The studs are joined to the sheets by stud welding and the sheets are then drawn tightly against the wall by the application of tensile forces to the studs. The studs are subsequently gas tightly joined to the wall, e.g. by welds. An alternative method of attachment uses a screw thread on the stud and the nut which is threaded onto the stud and bears against a washer and a sealing ring which is pressed against the wall around the stud.

Abstract: A joined ceramic-metal composite substrate having a copper sheet directly joined to a ceramic substrate and a method for the production thereof. The composite substrate is characterized by having at least one through hole in the copper sheet which is connected to at least one groove formed at a distance from the edge of the copper sheet on the surface of the copper sheet to be joined to the ceramic substrate.

Abstract: A method for arranging at least one through-channel in a solid body, such as a hot runner, which includes the steps of:(1) providing at least two solid blocks which have complementary side faces and which are together sufficiently large to form the body,(2) forming corresponding grooves in the side faces of the solid blocks,(3) placing the side faces of the solid blocks together such that the grooves together bound a channel,(4) coupling of the blocks into a body, and(5) passing a liquid abrasive agent with force through the channel for a certain period of time in order to modify the channel into a desired rheological form through honing, which honing may be pulsating.

Abstract: A metallic tip for attachment to a vacuum-operated wand of the type for handling of semiconductor wafers and the like. The wand tip has a tubular portion for attachment to the wand and has a flattened portion with generally parallel upper and lower walls extending from the tubular portion. The lower wall has a slotted region to expose the inner surface of the upper wall so as to define a vacuum pocket. The upper wall has a raised region to promote stiffness and to allow fluid communication between the tubular portion and the vacuum pocket. The upper and lower walls are in physical contact and are in vacuum-sealed relation about the major portion of the periphery of the vacuum pocket. The unitary tip is formed by compressing a portion of a tubular metallic member to form the upper and lower walls. A slot is machined into the lower wall to provide the vacuum pocket, afterwhich a mandrel is inserted into the tubular portion and a second compression is performed.

Abstract: A process for producing a heating plate involves fastening a tubular heating element (1) to a plate (2) made of metal or metal alloy. A plate (2) made of rolled metal or metal alloy is used, and cold-stamped in this plate is a shoulder (3), the contour of which corresponds substantially to the contour of the tubular heating element (1). The tubular heating element (1) is placed against the shoulder (3) and fastened to the plate by soldering. The thickness of the central part of the plate (2) is sufficient to withstand the thermal stresses which it must undergo. The process is especially useful for producing a heating sole of a steam-operated smoothing iron.

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: An injection mould having several gating points (3) which are all supplied with moulding material at the same time has a hot runner manifold (2) situated in a composite body. The composite body is composed of several plates (9,11,12,13,9') in which both the system of hot runners (2) and the tubular heating elements (10) required for heating are formed, starting from the surfaces of separation (F1, F2, F3, F4), whereupon the individual surfaces are joined together by diffusion welding after they have been pretreated as required (FIG. 2).

Abstract: The invention broadly comprises forming a weld preparation groove in the surface of a cylindrical roller, said groove being parallel to the longtitudinal axis of the roller. The groove is filled with a weld material. Subsequently, the outer surface of the cylinder is welded with a compatible welding material to coat the cylinder surface. The weld materials both for the groove and the surface are compatible such that when the surface is welded, the weld material in the groove is recast to form a homogeneous grain structure with the surface weld. The slot is then formed and the surfaces of the facing walls of the slot, the slot edges and the roller surface are uniformly coated.

Abstract: An injection moulding tool with optimum temperature distribution as the result of an improved tempering duct system is obtained if the tool inserts (10, 11) are each made up of two or more plates, tempering ducts (12, 12', 12") are worked in from the external faces (F1, F2, F3), on which the parts are subsequently joined by the diffusion welding method. An injection moulding tool for VHS reel hubs produced by this method produces moulds for injection moulding with substantially reduced wobble and a reduced cycle time.

Abstract: A power component such as a power transistor is mounted on an insulating substrate of, e.g., beryllia by using a thick film deposition technique. A first layer (2) is deposited and a second layer (3) is deposited over the first layer to produce a regular series of troughs and lands, in the preferred embodiment troughs and ridges, whereby voiding in the solder bond is minimized if not eliminated to thus maintain a good thermal conductivity between the component and the substrate.

Abstract: A side pocket mandrel for use in well tubing. The mandrel has a body, having an open bore extending through the body in alignment with the well tubing, and a side pocket offset from the bore. A valve receptacle is formed in the side pocket of the mandrel. The body of the mandrel has a plurality of forged indentations. These indentations are axially spaced above the valve receptacle and extend into the side pocket for a distance sufficient to keep well tools from entering the valve receptacle. The indentations may also taper away from the valve receptacle.

Abstract: An electron tube evacuating system includes a manifold section having an evacuation chamber. A tube mounting section has a plurality of evacuation apertures in communication with the evacuation chamber. A plurality of tube mounting members individually hermetically mount tubes to be evacuated onto the mounting section. Each mounting member has an aperture in communication with the evacuation chamber.

Abstract: The object of the invention relates to the technical sector of microelectronics. According to the process, one starts off with a hollow stainless steel tube (1) of determined diameter; the tube (1) is shrunk for a certain length (1a) and flattened, the remaining part is flattened to form two opposite flat non close joining faces (1b) and (1c); a slot (1b1) is machined in one of the flattened faces (1b) and a hole (1c1) in the other face (1c); a blade (2) provided with an axial notch (2a) on one of its edges is inserted between the two faces (1b) and (1c); through the hole (1c1) formed in one of the faces, a powder is inserted, designed to carry out microbrazing after heating; the assembly is placed in to a furnace to insure bracing of the blade (2) with the flattened parts and simultaneously filling by microbrazing remaining cavities between the blades and the flattened parts; the ends of the flattened gripping parts are rounded off; the flattened gripping areas are ground.

Abstract: A T-jointing weld beveling for welding a plate member to a rib-like member having a varying thickness in a T-shaped manner is improved in that a beveling width changes in accordance with the thickness of the rib-like member and the edges of the beveled portion are wave-shaped so as to form intermittent gap space portions between the rib-like member and said edges, whereby uniform penetration beads can be formed, the welding can be achieved with a small electric current over the entire length of the rib-like member, and control of a welding condition can be facilitated.

Abstract: An improved housing structure for a large-size free-standing cabinet, and a method of making same. The housing structure employs an upright U-shaped side wall structure joined between top and bottom walls. The side wall structure employs a U-shaped metal skin which is formed in one piece so that the back and side walls are integrally joined together through rounded rear corners, with the front edges of the side walls also being rounded to form front integral edge strips which define the opposite sides of the front opening of the cabinet.

Abstract: A fluid handling body and a method of attaching extension tubes to the fluid handling body which effectively seals the tubes to the body in a simple manufacturing operation, reducing the number of manufacturing operations required while minimizing the possibilities of damage to the tubes or undesirably restricting the fluid flow path in the body or tubes. The method hereof is particularly advantageous where several tubes are to be attached to the body to produce a precise, leak-free component. The body includes a fluid flow passageway extending into one end and a saucer-like cavity in the other end. A plurality of bores extend through the body between the cavity and passageway. With the tubes received in the bores, a paste is applied in the cavity. The outer periphery of the body is heated, melting the paste in a single heating operation and effecting flow of the paste in the cavity into circumscribing relation about the tubes.

Abstract: A method of making a rotor of a fluid energy translating device wherein the rotor has an annular passage entirely within the rotor, a plurality of radially extending vane slots intersecting the passage and axial openings intersecting the annular passage. The method comprises forming an annular groove in the periphery of a solid body, closing the open side of the groove to provide the annular passage, forming radial vane slots in the body intersecting the annular passage, and forming axial openings in the body intersecting the annular passage.

Abstract: Machined planar array serpentines and transmission lines. The waveguide is fabricated in two parts. In cross section, one part is U-shaped having two side walls and a bottom wall machined out of one piece of aluminum. A plate rests upon and is arc welded to the upper edges of the side walls to provide a fourth wall.

Abstract: This invention relates to an improved method of manufacturing injection molding manifolds for multicavity molding. The method includes gun drilling a longitudinal duct through a steel manifold body, drilling a transverse inlet duct to connect to an inlet on one surface of the manifold, and drilling diagonal outlet ducts to connect to spaced outlets on the opposite surface of the manifold. The outlet ducts are smaller in diameter than the longitudinal duct to match the rest of the system. Before the outlet ducts are drilled, end portions of the longitudinal duct are drilled out to a larger diameter and steel plugs having a tapered well are securely welded into them with the mouth of the well in alignment with the longitudinal duct. The plugs are larger in diameter than the central portion of the longitudinal duct to avoid the formation of thin knife edge portions where the outlet ducts join the longitudinal duct which often break down during use.

Abstract: A dual alloy cooled turbine is manufactured by casting a hollow cylinder of first nickel-base alloy material with high creep resistance to produce directionally oriented grain boundaries. A preform of a second nickel-base alloy material with high tensile strength and high low-cycle-fatigue strength is diffusion bonded into the bore of the hollow cylinder by subjecting the cylinder and preform to hot isostatic pressing. The resulting cylindrical block is cut into thin precisely flat wafers. A plurality of alignable holes for forming fluid cooling passages are photochemically etched into the individual wafers. The wafers then are laminated by vacuum diffusion bonding techniques, with the holes aligned to form fluid cooling passages. The resulting laminated block is machined to produce the turbine wheel with turbine blades through which the cooling passages extend.

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 method of producing a fluid-tight seal between a thin, flexible member and a support including the steps of providing a moat for receiving excess braze material on an external surface of a member support and a dam adjacent to the moat to confine the excess braze material to the moat and having a height above the bottom of the moat to accommodate a brazing of the member to the external surface, positioning the member to extend across the dam and the surface while contacting only the top of the dam and brazing the member to the surface while maintaining the contact between the top of the dam and the member to uniformly support the member.

Abstract: The barrel housing of a multistage centrifugal pump has an elongated cylindrical main section and a discrete annular section which is inserted into one end portion and defines an annular shoulder facing the other end portion of the main section. The shoulder is engaged by the inner casing of the pump. The annular section can constitute a prefabricated component or is formed by cladding. The inlet opening of the housing is provided only in the one end portion of the main section, only in a portion of the annular section which extends outwardly beyond the one end portion of the main section, or is a composite opening having a first part in the one end portion of the main section and a registering second part in the annular section. The outlet opening for compressed fluid is provided in the other end portion of the main section.

Abstract: A novel and highly efficient die forming method is disclosed wherein a plurality of blank workpieces, preferably plate blanks, are prepared and assembled together in a format such that a die blank may be produced therefrom which has a contour at least roughly approaching the contour of a desired die product. The blank workpieces are assembled together by permanently joining them, preferably by fusion-welding. The die blank so produced is then preferably subjected to heat-treatment and is thereupon machined, preferably by EDM, to progressively develop the desired contour therein from the rough-shaped contour.

Abstract: A handlebar stem assembly is provided for securing the handlebars to the frame of a motocross bicycle consisting of top and bottom plates formed with arcuate grooves to receive and secure the handlebars therebetween. The bottom plate is welded to a stem which attaches to the bicycle frame, and at least one generally arcuate shaped relief opening is formed in the bottom plate adjacent its welded connection to the stem for reducing the stress concentration at such connection.

Abstract: A method of manufacturing a vent element having vent pores extending therethrough in parallel with the axial direction for use in die casting, rubber and plastic molding, metering and supplying of fluids, a ball-point pen and others. The method comprises winding one or more wire rods consisting of metal, ceramics or a compound material thereof having a melting point higher than that of a core rod in the form of a single or plural layer spirally around the core rod to form a secondary wire rod, heating the secondary wire rod or a bundle of a plurality of the secondary wire rods to a temperature which exceeds the melting point of the core rod but does not melt the wire rod so as to melt the core rod, whereby the melt is infiltrated into the interspaces between the wire rods and/or the windings of the wire rod to form one pore at every position where the core rod was.

Abstract: A process for making glass fibers as provided comprising supplying a stream of molten glass to a rotating rotor; discharging said glass through orifices in said rotor as a plurality of primary streams; and attenuating said primary streams into fibers, said spinner being fabricated from a superalloy by a process comprising hot isostatically pressing the superalloy material sufficient to substantially increase the high-temperature service capability of the rotor.

Abstract: A method of manufacturing hollow flow profiles having optimum aerodynamic configurations in conformance with a commensurate application, about the respective outer skin of which there flows a first work medium during operation, such as hot gas, whereas ducts which are arranged within the interior of the flow profiles are concurrently streamed through by a second work medium, such as compressed air. The method of the present invention employs suitable deformation techniques (drawing, circular swaging or rolling) at preselected locations to particularly produce web-like aggregations of material. When appropriate materials are used for this purpose, contoured profiles of that type can also be formed through extruding. The webs, depending upon the demands of preceding or successive process steps, can be formed externally, internally or on both sides of the conduit material.

Abstract: A process for making glass fibers is provided comprising supplying a stream of molten glass to a rotating rotor; discharging said glass through orifices in said rotor as a plurality of primary streams; and attenuating said primary streams into fibers, said spinner being fabricated from a superalloy by a process comprising electropolishing said rotor sufficient to substantially eliminate the "break-in" period otherwise associated with such rotors.

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: A substrate of a dimensionally-stable material is formed with precision m cavities therein for various linear or nonlinear optical elements or electro-optical elements such as lenses, beam splitters, reflectors, detectors, polarizers, Kerr cells, Pockel cells, etc. Various openings are also made in the substrate for function as optical paths or waveguides. The elements are then bonded into their respective cavities by glueing or soldering; the optical system thus formed is sealed in an air-tight housing.

Abstract: A method of making an orificed discharge wall for supplying a plurality of streams of molten inorganic material to be attenuated into filaments comprising inserting elements in apertures in a member; sealing said elements and member within a coating adapted to isostatically transmit pressure to said assembly; applying isostatic pressure to the hermetically sealed elements and member to mechanically seal the elements to the member; and heating the mechanically sealed elements and member to fuse the elements to the member to prevent the unwanted passage of molten glass between said elements and said member, said elements having an orifice to permit the passage of molten glass therethrough to establish said streams.

Abstract: This invention relates to an improved connector assembly for an electrically heated injection molding sprue bushing and a method of making the same. The sprue bushing has a helical portion of the heating element extending around a central core portion which conveys pressurized melt from a molding machine to a cavity in the mold. It is formed by filling the space between the stainless steel core portion and a stainless steel outer sleeve by a highly conductive copper alloy. The heating element has a lead portion which extends out through an aperture. The aperture provides a seat which receives two split washers with central openings therethrough for the lead portion. The washers are each formed of two half washers which are oriented so that the divisions therebetween are not aligned. A connector sleeve is inserted over the projecting lead portion with a flared end which is received in the aperture against the washers. The washers and connector sleeve are brazed in position in a vacuum furnace.

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: Large-area, blister-free assemblies of direct-bonded metal to a ceramic or metal substrate are obtained by providing venting channels in the metal-substrate interface. The channels may be formed in the metal or substrate surface to be bonded. The channels in the metal may be formed by etching, while the channels in the ceramic may be formed by mechanical techniques, such as grinding. The metal-to-substrate direct bond may be formed by any conventional processes employing an eutectic melt composition to bond the metal to the substrate.

Abstract: This invention relates to an improved connector assembly for an electrically heated injection molding sprue bushing and a method of making the same. The sprue bushing has a helical portion of the heating element extending around a central core portion which conveys pressurized melt from a molding machine to a cavity in the mold. It is formed by filling the space between the stainless steel core portion and a stainless steel outer sleeve by a highly conductive copper alloy. The heating element has a lead portion which extends out through an aperture. The aperture provides a seat which receives two split washers with central openings therethrough for the lead portion. The washers are each formed of two half washers which are oriented so that the divisions therebetween are not aligned. A connector sleeve is inserted over the projecting lead portion with a flared end which is received in the aperture against the washers. The washers and connector sleeve are brazed in position in a vacuum furnace.

Abstract: A method of making a workpiece holding device having an expandable mandrel including the step of melting copper ring seals around the bore next to the ends of the expandable mandrel to maintain the mandrel rigidly in place. The holding device includes an expandable sleeve of generally cylindrical shape having a thin outer shell with a pair of opposed thick wall circular ends integral with the shell extending radially inward to form a bore. An elongated generally circular central body with a central bore for containing pressure and adapted to be mounted on a machine tool having an outside diameter engageable with the bore. A pair of opposed arcuate undercut grooves are formed at an intersection of the outer shell and the circular ends to prevent the formation of destructive stress concentration at the intersection. Chamfers are formed at the outer edges of the bore and copper rings are inserted therein and melted to form a seal between the bore and mount the expandable sleeve to the central body.

Abstract: Manufacture of a light metal shock absorber by impact extrusion of the light metal of a steel-light metal composite blank, wherein the metallic bonding of the composite blank is achieved by coextrusion. The steel component on the bottom face of the light metal shock absorber is provided with a steel ring which is welded or otherwise appropriately joined during or after impact extrusion. Also the light metal sleeve of the shock absorber can, after impact extrusion, be welded or otherwise appropriately joined to light metal.

Abstract: This invention relates to a method of manufacturing laminated material. Particularly to laminated materials for use in the construction of flame tubes of gas turbine engines.The laminated material is manufactured from three sheets, a central sheet, a first sheet, and a second sheet. The central sheet is perforated with an arrangement of equi-spaced apertures. The central sheet with apertures is then secured to the first sheet. A number of channels are machined through the central sheet to leave the first sheet and an arrangement of equi-spaced lands secured thereto. The first sheet is perforated with an arrangement of equi-spaced apertures to form air entry holes. The second sheet is then secured to the assembly to form a laminated material comprising a first sheet with apertures and second sheet separated by an arrangement of equi-spaced lands machined from central sheet.

Abstract: Laminated plate cylindrical receiver plug assembly structure having rectangular cross section passages therein which extend axially of the plug assembly through one end thereof on opposite sides of a very narrow divider plate and radially out of the plug assembly on opposite sides of the divider plate from the side on which the axially extending portion of the passages are on is produced by producing a plurality of separate plates having axially and/or transversely extending openings in one end thereof in rectangular form, coating every other one of the plates with brazing material, placing the rectangular plates in side by side surface engagement with the openings therein in alignment to form rectangular cross section axially and radially extending passages through the plug assembly and subjecting them to brazing temperature and pressure and then machining the ends of the brazed together rectangular plates having the openings therein into a cylindrical form and cutting off the other end of the plates.

Abstract: A mandrel (10) of simplified construction and reduced cross sectional size for connection in well tubing comprises a cylindrical body (16) defining a main bore (20) for passage of wire line tools therethrough. A longitudinal slot (30) is formed in the cylindrical body (16). A side pocket subassembly (34, 42, 50, and 52) is secured to the body (16) over the longitudinal slot (30) formed in the body. The slot (30) is sized to permit passage of pocket devices only from the main bore (20) through the offset chamber (44) and into the pocket (60). If desired, an orienting member (22) can be provided within the cylindrical body (16).