Abstract: Nb wire and Sn plated Cu wire and/or Sn plated Cu foil strip are fabricated into a composite that is mechanically worked to form a multifilament superconductor precursor that does not require intermediate anneals and that has required amounts of Sn distributed throughout its cross section for efficient reaction with the Nb filaments.

Abstract: Procedure for rebuilding a movable plate in the pouring valve of a ladle, involving the complete reconstruction of the original nozzle, which has been removed, and of a flat portion, also removed, around the pouring hole, in a circular or rectangular area whose width is equal to at least the external diameter of the nozzle. The nozzle is reconstructed with a prefabricated piece of refractory material, or with fresh refractory material packed "in situ", and may be of the same shape as the original nozzle, or of a different shape; the flat portion is reconstructed using a prefabricated refractory piece, or with fresh refractory material packed "in situ".

Abstract: A tube is inserted in a bore in a tube sheet, the tube having an outside diameter slightly smaller than the bore. Hydraulic pressure is applied to the tube internally to expand it radially throughout a pressure zone that extends at least up to one end of the bore. The pressure is confined between two axially spaced seals that encircle a mandrel and are engagable with the inner surface of the tube. The mandrel and seals are then shifted to relocate the pressure zone so that it does not reach the end, and increased pressure is applied to produce a firmer contact between the outside of the tube and the bore. Any crevices between the tube and the tube sheet in which corrosion would be likely to occur are thus eliminated. The invention is particularly suitable for use in connection with the heat exchangers of nuclear plants.

Abstract: A method for the manufacture of heat exchangers where tubes of rectangular section are assembled with dissipators for forming a plane core which is curved by applying a bending force on the small sides of the tubes, thereby making cores. These cores are assembled by engaging the ends of the tubes into tubular plates which are part of boxes.

Abstract: Component materials of an article having a metallic element encased within a brittle bulb are reclaimed by passing the article between two rotating rollers spaced apart a distance less than a dimension of the bulb but greater than a dimension of the metallic element thereby shattering the bulb without altering the structure of the metallic element. The shattered brittle bulb material is then separated from the metallic element as with a magnetic separator.

Abstract: A process for making composite bearings with low friction surfaces and metal backings in which the metal backing is used to draw low friction material into the shape of the bearing surface. Heat is used to aid bonding of the low friction material to the backing.

Abstract: A bag of tough, flexible material, sealed to be liquid tight except for filling and emptying access ports, is designed for mounting in a standard transportation container. The bag is then filled with a bulk liquid and transported in the container to a desired destination where it is again emptied. To avoid the transportation cost of returning many such bags to the point of origin, while nevertheless not simply discarding them, the present invention provides the third alternative of so constructing each bag that, after use, it can be cut to become suitable for use as a tarpaulin. For this purpose the bag is constructed of a central, generally cylindrical, elongated portion extending at each end into a curved end portion. Tie down devices, i.e.

Abstract: The sides of a heat exchanger unit are joined with perimeter flanges which are folded one over the other and then crimped tightly in such fashion as to cause adjacent portions of the perimeter to extend at different angles in different planes resulting in a scissor action therebetween effective to securely clamp the heat exchanger sides together and form a leak-proof chamber.

Abstract: A process for manufacturing an unground bearing suitable for high-speed applications comprises forming a subassembly including the inner race, ball and retainer; the subassembly being fabricated in a fixture which receives the balls from a standard ball feeding machine. The subassembly is, after completion, removed from the fixture and positioned in one of the halves of a split outer race, the other half of the split outer race is placed over the subassembly and an outer shell is thereafter crimped over the outer races to hold the bearing together.

Abstract: A bored thrust bearing having a bearing face formed in series with tapered lands for forming a thrust load-carrying oil film, each tapered land being formed with a foot surface having a given sloping angle (.beta.) and an upper surface having a gentle sloping angle (.alpha.) less than the given sloping angle, the foot surface and the upper surface having therebetween a rounded boundary.

Abstract: A method and apparatus for manufacturing heat exchangers for cooling and heating purposes from substantially rectangular tube elements alternating with surface-enlarging members in the form of thin pleated metal strips being advanced, pressed against each other, through a heating zone for soldering together and thereafter discharged through a cooling zone for cooling the solder to fusion temperature, the advancing movement being opposed by a constant retarding force means acting in a direction counter to the direction of advance.

Abstract: A method of making a tape guide pin or sleeve adapted to directly engage the back of recording tape or the like, comprises applying a surface layer of a nonmagnetic hard material on a base body of nonmagnetic material and then forming microscopic tips on the circumferential surface of the hard-surfacing layer such that the pattern of the microscopic tips extend substantially linearly in the transverse direction to the axial dimension of the pin or sleeve. These tips are then fine-finished and thereby rounded. The tape guide has improved wear-resistance and frictional characteristics by comparison with even tape guides free from the surface roughening formed by the microscopic tips.

Abstract: The heat exchange tube has a porous thermal shock resistant outer shell composed of a corrosion resistant ceramic material that may have a finned outer surface or a plain cylindrical outer surface. The outer shell contains an inner tube composed of a dense nonporous ceramic which is capable of containing high pressure gases, but which may not be as thermally shock resistant or corrosion resistant as the outer shell. The inner tube is formed of a dense ceramic material such as a highly dense silicon carbide or silicon nitride having at each end a like density insert. The end inserts provide sealing surfaces to contact other components in the heat exchanger such as identical ceramic tube assemblies to form a gas-type pressure seal. The inner tube can be fabricated by a deposition technique suh as a chemical or physical vapor deposition, and alternatively, can be made separately and press fitted into the outer shell or the outer shell can be cast or otherwise formed around the inner tube.

Abstract: In a non-machining method for manufacturing a solid-bottomed or internally flanged bearing race, especially for rolling contact bearings, the starting material is in the form of a band. For the economical manufacture of this bearing race with an annular groove of extremely precise cross-sectional shape which reduces the wall thickness of the bearing race, and which is situated at the transition from the bottom or flange portion to the race portion, a flat roundel is first stamped from the band. Then a concentric annular groove is worked into one of the planar surfaces of the roundel, while the opposite planar surface thereof is supported on a planar supporting surface. Lastly, the roundel is deep-drawn in a die to form a bearing race having a solid bottom. The end face of the drawing punch concentrically engages the roundel's planar surface that is encompassed by the annular groove.

Abstract: A method for making complementary pairs of race rings for rolling bearing assemblies from a unitary metallic base component formed with the raceways for the rings consisting of the steps of:a. forming at least one annular separation seam in the metallic base component defining a bridge which can be severed to form the paired bearing race rings;b. hardening the metallic base component;c. machining the raceways of the rings simultaneously or successively;d. plastic coating the base component to form housing sections adjacent the bearing and side surfaces of the race rings exposing the raceways and separation seam; ande. separating the base component at the bridge to form the finished race rings.

Abstract: The invention provides a pipe or similar tubular member of ductile cast iron having an end casing. The thin walled casing has a curved profile at its entrance divided into two sections, of which one is formed by centrifugal casting, whereas the other, of lesser curvature, is made by hot or cold forming with a simultaneous axial compression and a radial bending directed towards the axis of the pipe. The invention is useful for forming fluid tight seals in pipelines using radial compression packings.

Abstract: Electromagnetic energy shielding material in forms such as form stable gaskets, caulking compounds, coatings, adhesives, etc., the material being composed of a plastic binder and electrically conductive particles having an aluminum core, a first metallic layer thereover e.g., of tin and a silver outer layer.

Abstract: A heat exchanger including a first piece of heat conductive tubing wound in helical configuration defining a plurality of first helical flights having an outboard portion thereon and a second piece of heat conductive tubing wound in a helical configuration defining a plurality of second helical flights having an inboard portion thereon where the first and second helical flights are arranged so that the outboard portions of the first helical flights are in heat conducting contact with the inboard portions of the second helical flights and where the first and second helical flights have been formed by forcing the outboard portions of the first helical flights and the inboard portions of the second helical flights together so that the portions are forced into heat conducting contact with each other. The disclosure also describes the method of manufacturing the heat exchanger and the method of operating the heat exchanger.

Abstract: Techniques are disclosed for renovating sliding gate valve plates or for adapting conventional plates for use with problem-beset metals. Stationary plates (1) have their orifices (2) bored out to downwardly-tapering form and correspondingly tapered prefabricated refractory insert rings (3) are then cemented in place, the rings having axial depths equal to the plate thicknesses. An orificed plate (7) furnished with an integral depending nozzle (12) has its flow passage (13) bored out such that an upper bore portion extending through the plate (7) and part way along the nozzle (12) is transversely larger than the following downstream bore portion. A prefabricated refractory insert ring (9) is cemented into the upper bore portion, ring (9) being substantially as deep axially as the said bore portion. The downstream bore portion is lined with cementitious, metal-reinforced material (14).

Abstract: A method for the manufacture of target boards for darts or archery, wherein the target boards are made by: compressing fibrous material into a cylindrical bundle with a set of press molds provided with clamp members adapted to clamp the fibrous material so as to remain in cylindrical shape, cutting the cylindrical bundle into circular pieces each being clamped by a pair of clamp members; bonding a reinforcing plate onto one surface of each of the circular pieces; removing the clamp members from the circular pieces; banding the circular pieces with metal strips around the periphery and covering the second surface with a decorative cover sheet.