Abstract: Metal/ceramic abradable seals of the type used in jet aircraft are improved by maintaining a temperature differential between the metal/ceramic composite and the cooler substrate during cooling from the brazing temperature.

Abstract: A system and method for retubing a steam generator for a pressurized water reactor while the steam generator is in place in a containment vessel.

Abstract: Method and means of rapidly repairing damaged portions of conduits and pipes which are difficult or impossible to weld, whereby in the vicinity of the pipes to be maintained prepared replacement pipe sections are stored each together with two associated quick-action unions which comprise an annular coupling body bridging the pipe ends to be joined and having at least one threaded portion and a sealing insert which may be compressed by means of plugs adapted to be screwed into the threaded portion, and after cutting out a portion of the pipe which includes the damaged area and the length of which corresponds substantially to the length of the prepared replacement pipe section the latter is inserted into the pipe line and sealed by tightening and quick-action unions.

Abstract: A skirt-like device attached to the exit end of a rocket engine nozzle is fabricated of thin sheet heat resistant metal; which when extended in operative condition is in frustoconical form, but which prior to engine firing is pleat-folded inwardly into a stowed position relative to the exit end of the rocket engine nozzle. Thus, prior to engine firing the device adds little or nothing to the engine/nozzle occupancy space; but incident to engine firing the device deploys to provide an effective engine nozzle/skirt combination of increased length and exit diameter/area; said combination having an inner surface of constant slope.

Abstract: An ultra-thin hermetically sealed button-type electrochemical cell is disclosed comprising a pair of mating metallic housing members, at least one of which is generally dish shaped to define an enclosed space therebetween. A peripheral opening defining a fill port is formed in one of the housing members, preferably at the junction formed by the mating surfaces. The interfacing surfaces of the cell housing members are welded together subsequent to the insertion of the internal cell components and prior to the addition of the electrolyte to form a hermetic seal. The electrolyte may then be added and the fill port hermetically sealed by welding. Owing to its relatively small size, the fill port may be quickly sealed so that the heat generated during the weld process is insufficient to volatilize the electrolyte.

Abstract: A sheet metal bending tool with first and second former members, one rotatable on a first axis, the former members being movable toward and away from each other on another axis normal to the first axis, the formers having opposed clamping faces, the rotatable former member having two clamping faces angularly related to each other by an angle equal to the angle of rotation during bending, the clamping face of the second former being toothed.

Abstract: Tapered stainless steel spool pieces are welded to the ends of stainless steel pipe lengths at the factory to provide subassemblies which are then annealed and thereafter in the field are positioned with the larger free ends of opposed spool pieces disposed to receive weld metal uniting the subassemblies while coolant liquid is maintained in contact with the inside surfaces of the spool pieces.

Abstract: A quadriplanar capacitor and the method of forming it is disclosed. A capacitor element is disposed within an open ended enclosure and sealed therein, the enclosure forming one capacitor electrode. The open end of the enclosure forms a quadrilateral. A flat electrode member forming the second capacitor electrode is fixedly attached to a lead which itself is rigidly attached to the capacitor element. The flat member is disposed parallel to the enclosure opening and spaced from the enclosure by the lead. The flat member is substantially coextensive with the enclosure opening.

Abstract: A system and method for retubing a steam generator for a pressurized water reactor while the steam generator is in place in a containment vessel.

Abstract: The method of making a laminar battery including the steps of contacting the cellophane side of a laminate of cellophane and zinc powder adhered to the cellophane with a polymeric binder with a cathode slurry of carbon and manganese dioxide in an aqueous solution of electrolytes, coating the zinc side of the laminate with a carbon slurry, and contacting the carbon slurry with a conductive plastic current collector, and cells and batteries made by this process.

Abstract: A method of operating a reheating furnace in a hot rolling line and a heating furnace therefor in which the reheating furnace is positioned between a continuous casting apparatus and a rolling apparatus rolling workpieces at a higher speed than they are cast by the casting process, the furnace serving as a heating and buffer zone. The heating furnace is longitudinally divided into two heating sections which are changed over so as to receive workpieces for heating and the workpieces are charged into one of the two sections after the other of the two sections has been filled up. The furnace is operated to collectively forward the workpieces heated up to predetermined rolling temperatures to the rolling apparatus for efficient rolling.

Abstract: A filter for blood and the like including a housing defining an inlet for fluids to be filtered, and an outlet for filtered fluid, plus a stack of filter pads of thermoplastic fibers positioned within the housing. According to one aspect of this invention, the stack of pads is joined together at their periphery by a heat seal to form an integral filter unit, while, typically, the stack is joined to the housing at such periphery by a second seal. In another aspect of this invention, the fluid inlet is positioned adjacent a first pad of the stack and the fluid outlet is adjacent a last pad of the stack, the diameter of the fibers of the last pad being smaller than the diameter of the fibers of the first pad, typically with the fiber diameter of intermediate pads generally decreasing from pad to pad in the direction of the last pad.

Abstract: The invention concerns a device for the extrusion of hollow or semi-hollow sections which are made in particular of a light metal. The device has at least one mandrel head on a mandrel support projecting into a die opening, the mandrel head being a special insert-type mandrel which is held in place on the mandrel support by a connecting device.

Abstract: A process and device for manufacturing, composite sections, by means of extrusion, are described. The composite sections comprise at least two components one of which is fed into the stream of metal being extruded and is securely joined to the face of the product without coming into contact with the face of the extrusion die.

Abstract: There is described a method of soft soldering aluminium or alloys thereof using a fluxed solder composition. The fluxed solder composition comprises a soldering flux suitable for use in soft soldering aluminium and its alloys and a soft solder alloy of lead, tin and silver and, optionally, up to 3% copper. The composition of the soft solder alloy is such that it contains at least 35% lead and 10% tin, and x% silver wherein x=0.1+(5.times.10.sup.-4)(Sn).sup.2 +(1.times.10.sup.-5)(Sn).sup.3, (Sn) being the percentage by weight of tin in the alloy.

Abstract: A safety device for press brakes comprises light projectors mounted on the side of a lower beam of the press brake so as to form a plurality of horizontal light beams extending between a punch and a workpiece, light receivers mounted on the side of the lower beam so as to receive said light beams, and detector means mounted between said light receivers and a safety circuit and adapted to be actuated immediately before the interruption of the light beams when the punch interrupts them with the downward movement of a slide, thereby preventing the stopping of the operation of the press brake.

Abstract: The invention relates to metal forming equipment and may be most advantageously used for the manufacture of single-tailed blades preferably for gas turbine engines. The hammer according to the invention has a stationary bed incorporating a load bearing frame carrying a lower die and a hammer cylinder. The hollow piston rod of the hammer cylinder accommodates a hammer body with an upper die, and its upper chamber is an explosion chamber. The invention resides in that the hammer body is mounted in the inner space of the hollow piston for an independent axial movement relative thereto under the action of a hammer piston arranged thereabove in the same inner space. The hammer piston is caused to move by pressure of gases released upon a blow-up in the explosion chamber. The chamber communicates with the inner space of the piston rod through a central opening of the piston. This construction considerably enlarges the manufacturing capabilities of the hammer according to the invention.

Abstract: An assembly system for assembling microcomponents of semi-conductor or other electronic devices includes on a unitary machine frame the tooling for precision excising tape mounted microcomponents, precision forming their electrical leads, placement of the components in correct registration with conductors on a pre-positioned substrate, and bonding the formed leads to the conductors.

Abstract: An improved back-up pad apparatus for use in externally welding abutting ends of pipe is formed of hard anodized aluminum material and comprises a plurality of arcuate back-up pads for interior positioning to face the weld. Each arcuate pad is mounted on a shoe for biased engagement with the interior cylindrical surfaces of the pipes. Intermediate shoes carrying cylindrically surfaced members are provided at the rounded ends of adjacent back-up pads.

Abstract: A method of manufacture of an annular seal element comprises the steps of providing an apertured backing ring with closely packed bristles extending radially outwardly from the circumference thereof, clamping the free ends of the bristle between a pair of co-axial rings and welding the rings and the outermost tips of the bristles into a unitary structure and subsequently machining away the original backing ring to leave the rings with radially inwardly extending bristles.The invention also includes a sealing element made by the method.