Abstract: An assembly for revaporizing liquefied gases. The arrangement is of the running water type and includes a nest of tubes (1) preferably grouped to form panels and connected to inlet and outlet manifolds and over which water is caused to flow. To withstand the corrosion of salt water, an A-G4MC alloy is used and the cross-section of each tube 1 includes two diametrally opposite outer fins 2,3 and inner fins 5. Said tube is produced preferably by extrusion.Application to vaporization of natural gas.

Abstract: A solar liquid-to-liquid heat exchanger, method of making the same, and hot water heating apparatus employing same are provided wherein such heat exchanger is comprised of a first tubular member made of a heat conductive tube material and having a plurality of turns, a second tubular member made of a heat conductive tube material and having a plurality of turns which correspond to and are fixed against the turns of the first member to provide a strong mechanical and thermal connection between immediately adjacent faces of associated member turns. The fixing of the turns of the members and utilization of the heat exchanger in a hot water heating apparatus with flow of a solar fluid used in such apparatus in one direction through the first tubular member and water to be heated through the second tubular member in counterflow to the one direction assures optimum transfer of heat from the solar fluid to the water to be heated.

Abstract: A method of and apparatus for fabricating a solar collector panel including providing a thermal conductive, heat absorbing plate having a plurality of grooves therein, feeding discrete lengths of solder strips having transverse curvatures into said grooves, respectively, placing a tube assembly having a plurality of conduits into said grooves of said plate is superimposed relation on said solder strips, holding said loose assembly together, and heating the loose assembly to melt the solder and effect a thermal conductive bond between said tube assembly and said plate.

Abstract: A method for joining two plate type heat exchanger core sections, previously brazed individually in intimate heat conducting relationship. The surfaces of the two heat exchanger core sections to be joined are non-planar as a result of brazing. In the method, the two core sections are stacked with their non-planar surfaces to be joined facing toward each other with an interposed layer comprising deformable metallic members. The deformable metallic members are subjected to a shear force causing them to be displaced to conform to the non-planar surfaces, substantially increasing the area over which they are in contact with these surfaces and thereby substantially increasing the heat conduction between the core sections. Closing members are thereafter inserted around the perimeter of the intermodular layer and joined to the heat exchanger core sections with a gas metal arc welding bead.

Abstract: A method and apparatus for producing highly effective head exchanger elements of the type which comprise corrugated surface enlarging members of strip material fixed to thin walled substrates. The strip material which can be either pre-corrugated or corrugated synchronously with the heat exchanger element manufacturing process is advanced concurrently with a substrate material to a station at which the strip is lightly held in firm abutment with the substrate material by means of an impinging stream of gaseous medium and simultaneously metallurgically bonded to the substrate. The composite product is then cut into lengths to form finished heat exchanger elements.

Abstract: A method for braze-assembling metal components having low softening temperatures is provided, whereby selective cooling of specific regions of stabilized dimensions with the aid of heat sinks prevents softening of the metal components at and proximal to the specific regions of stabilized dimensions.

Abstract: A method of making and the resulting heat exchanger in which there is provided a header plate having a tube receiving opening closely embracing the tube in the opening with a sheet of solder on at least one of the tube and plate adjacent to the opening together with a retainer wettable by the molten solder attached to the tube and plate and bearing against the solder to retain it in position. The assembly of tube, plate, retainer and solder is heated to a melting temperature for the solder with the result that the molten solder flows over the wettable retainer and into the space between the plate and tube by capillary attraction after which the solder is cooled to a solidifying temperature to form a solder joint uniting the tube and header.

Abstract: A servicing machine for a steam generator is accurately set up in the generator channel head with a pivoted arm mounted for rotation in a plane parallel to the tubesheet. The angular position of the arm, the longitudinal position of a carriage mounted on the arm and the vertical position of a platform on the carriage are remotely controlled to maneuver a probe used in mapping the precise location of the thousands of holes in the tubesheet. Various operations are then performed at each precise hole location by tools carried by the arm mounted carriage to prepare for installation of new tubing. The operation of a pair of remotely controlled pivoted arms, one on each side of the channel head divider plate, is coordinated to automatically position the ends of U-shaped tubes in corresponding holes in the tubesheet on opposite sides of the divider plate and to secure the same in place.

Abstract: A heat exchanger assembly of the type having a heat transfer core element which includes a plurality of fins in parallel stacked relationship for defining heat transfer surfaces and a plurality of fluid carrying tubes extending transversely through the fins for defining a fluid circuit, the assembly including at least one tube-to-tube joint, the improvement comprising a solderless connection at the tube-to-tube joint wherein one of the tubes includes an end having an annular, outwardly extending shoulder followed by an inwardly tapered flared portion for receiving the outwardly tapered portion of the other portion and the other of the tubes including an end having an outwardly flared portion for receiving the outwardly tapered portion of the other tube end and an inwardly directed flange clinched over the shoulder of the other tube end to produce a solderless mechanical connection between the two tubes.

Abstract: A method for forming a liquid cooled airfoil for a gas turbine is disclosed. A plurality of holes are formed at spaced locations in an oversized airfoil blank. A pre-formed composite liquid coolant tube is bonded into each of the holes. The composite tube includes an inner member formed of an anti-corrosive material and an outer member formed of a material exhibiting a high degree of thermal conductivity. After the coolant tubes have been bonded to the airfoil blank, the airfoil blank is machined to a desired shape, such that a portion of the outer member of each of the composite tubes is contiguous with the outer surface of the machined airfoil blank. Finally, an external skin is bonded to the exposed outer surface of both the machined airfoil blank and the composite tubes.

Abstract: Method and apparatus for expeditious installation of bottom-supporting and side-anchoring blocks for a tube and tube sheet bottom repair apparatus in the interior of the channel head of a steam generator at one side of the divider plate in a nuclear power plant, involving use of special tools and fixtures for location and welding of such blocks in position by use of information derived from measurement of the extent and direction of tilt of the tube sheet bottom from a purely horizontal attitude.

Abstract: An improved method for manufacturing a heat transfer assembly particularly useful as a component of a radiator used to remove heat from the coolant of an internal combustion engine. The heat transfer assembly includes a plurality of louvered fin strips having fold edges that are in heat transfer contact, through solder joints, with flat-sided tubes designed to carry the fluid to be cooled by a flow of air contacting both the exterior surfaces of the tubes and the fin strip surfaces. The improved method involves the application of beads of solder to the fold edges of the fin strips, rather than to the tubes as in the prior art, before assembly of the fin strips and the tubes. The improved method reduces the amount of solder required and thereby reduces manufacturing cost.

Abstract: Plates of a plate heat exchanger, defining between them a space adapted to be traversed by a heat-exchange fluid, are held together and are soldered in a chamber in which the plates are heated by passing a heating fluid, generally an inert gas, directly through the passages between the plates.

Abstract: A tube-type vessel, such as a heat exchanger, has tubes that extend away from a tubesheet provided with holes which axially align with the tubes and open into the tube interiors. The diameter of each hole in the tubesheet is less than the outside diameter of the tube with which it aligns, but is greater than the inside diameter of the tube, thereby producing an offset between the inside surface of the tube and the surface of the hole. The tubes are attached to the tubesheet by welds, and each weld forms a fillet between exterior surface of its tube and the back face of the tubesheet and further forms a smooth beveled transition between the inside surface of the tube and the surface of the hole. The fillets eliminate the crevices that surround the tubes in conventional structures, and as a consequence no material will build up around the tubes and collapse them. To unite the tubes with the tubesheet, the latter at each hole is provided with a socket into which the end of a tube is fitted.

Abstract: In this panel-type radiator a pair of panels are disposed in adjacent, side-by-side relationship, and each is made of two thin dished sheets of steel. Adjacent sheets of the adjacent panels are each provided with a thin-walled embossment of generally truncated conical form having a central opening extending through its outer end. Each embossment also comprises a radially-extending flange surrounding the opening and an annular portion of rounded cross-section joining the flange and the generally conical portion of the embossment. The flanges are disposed in juxtaposition with the openings generally aligned, thus providing externally of the flanges a groove of generally V-shaped cross-section between the annular portions of the embossments. A deposit of silicon bronze forms a brazed joint between the embossments, and this deposit comprises an annular filet of silicon bronze disposed in the V-shaped groove and a film of silicon bronze between the juxtaposed flanges.

Abstract: An L-shaped member is used for positioning a plurality of tube support plates at predetermined spaced locations on the L-shaped member with the tube holes of the support plates aligned. The L-shaped member is portable and includes a plurality of longitudinally separated members for locating the tube support plates with a predetermined spacing between each tube support plate.

Abstract: The fins of a heat exchanger are brazed to the exterior of the fluid-carrying tube by means of a lower melting point cladding on the tube which forms a secure bond between the tube surface and the unconfigured portion of the perimeter of the tube-receiving holes in the fins. The fins have a limited number of narrow tabs doubled back from the edge of each hole to function as longitudinal spacers between adjacent fins.

Abstract: A tube-in-shell heat exchanger for effecting heat exchange between steam conducted by the heat exchange tubes and liquid metal conducted through the shell. The tubes penetrate the tube sheet by means of clearance apertures and are sealed thereto with thermal sleeves which are brazed to the tubes so that fusion welds are avoided in the sodium/water barrier.

Abstract: The copper inlet and outlet tube arrangements for an essentially all aluminum coil comprised of aluminum fins, hairpin tubes, and return bends, are ultrasonically soldered to open ends of the hairpin tubes at the same time as the return bends are soldered to the hairpin tubes in an ultrasonic soldering bath; with any bonds of the copper inlet and outlet tube arrangements, such as connections to an expansion device and a connection to a suction header being located at an elevation above the solder bath to preclude contamination of the bath from the bonds.

Abstract: Methods are disclosed for more practical construction of liquid-cooled buckets able to efficiently transport heat energy from the inside of the airfoil skin surface in contact with hot gas to the outer surface of preformed tubes recessed into the bucket core, through which tubes liquid coolant is passed during operation. The bucket is made of a series of preformed solid components, which are assembled, consolidated and then converted into a unified structure. In each arrangement illustrated one of the preformed solid components is a flat bimetallic sheet comprising an erosion, corrosion resistant layer and a layer of high thermal conductivity, these layers being joined by an optimized metallurgical bond.

Abstract: A tube sheet construction for heat exchangers, particularly those of the type which utilize immiscible fluid heat exchange media, is formed with a tube sheet base plate and with a plurality of heat exchange tubes extending along at least a portion of their lengths in sealed fluid-tight engagement through the tube sheet base plate. The base plate is provided with a series of internal ducts extending in flow communication with the exterior of the tubes at the portion of the length thereof in sealed engagement with the base plate. The ducts are in flow communication with the exterior of the base plate and permit leaking fluid heat exchange media to be detected and exhausted from the heat exchanger. The tube ends extend beyond the base plate and a tube sheet cover plate extends over the base plate and is rigidly connected thereto with the cover plate having the projecting ends of the tubes fixed thereto by welding or the like.

Abstract: Failure under stress of brazed aluminum assemblies prepared by fluxless brazing is prevented by controlling the grain size before brazing of the material in contact with the brazing alloy to be at least 60.mu..

Abstract: A method of making a solar absorber panel is disclosed in which mild steel sheets are provided with a pattern of recesses such that when the sheets are superimposed, an internal hollow fluid heat transfer passage system is formed thereby including inlet and outlet manifolds joined by connecting passages. A metallic sealing material having a lower melting point than the sheets is placed in the recesses, the sheets are superimposed and the structure is peripherally welded to form a gas-tight envelope. The envelope is purged of air, partially internally evacuated and the edges of the internal passages sealed by heating the assembly above the melting point of the sealant material. The vacuum drawn on the envelope insures a tight seal between all passages as it allows external ambient air pressure to force the sheets together.

Abstract: A weldment heat exchanger having at least the surfaces contacted by the fluids between which heat is exchanged of stainless steel and comprising a tube bundle having spaced tubes through which one of the fluids flows and over the outer surfaces of which tubes a second fluid flows for exchange of heat between the fluids through the walls of the tubes, a first header-tank at one end of the bundle and a second header-tank at the opposite end of the bundle, the joints of the parts including those of the two header-tanks and the tubes being welded.

Abstract: A set of metal heat exchange tubes is simultaneously brazed into a metal tube sheet more rapidly and with greater uniformity by holding tube-and-sheet assembly under radiant heater with sheet essentially horizontal and carrying brazing metal, and forcing gases from above tubes down into tubes as assembly is heated. Heater can have heating surface enveloping the top and sides of the sheet, or can have flat heating surface, but is preferably a ceramic fiber gas burner. Burner can be divided into two portions using a single ceramic fiber mat and separate combustion mixture supplies, with non-combustible gas fed through one portion when other portion is the only one operating.

Abstract: A process for soldering aluminum fins to cooling pipes made of aluminum, copper, brass or steel to produce a cooling assembly. The fins are etched in the solution of sodium hydroxide, zinc chloride, technical urea and water and the cooling pipes are coated with a fusible alloy which is covered with a protective coating for attenuating electro-corrosion between the alloy and the aluminum fins. The aluminum fins are then mounted on the cooling pipes and soldered thereto in a thermal bath.

Abstract: The constructional parts have walls formed of elongated elements, such as res or tubes, wound spirally in juxtaposition about the axis of symmetry of the part and connected to each other. The elongated elements are bent to shape utilizing a bending device having at least one bending groove conformable to the predetermined three-dimensional geometry of the part to be manufactured. One end of each wire or tube is fixed to the bending device and the other end is engaged in a clamping and adjusting device designed as a combined Cardan swivel joint which, during the bending, it utilized to continuously control the adjustment parameters of the wire or tube, about three mutually intersecting axes, in conformity with such predetermined three-dimensional geometry of the part.

Abstract: Plates of a plate heat exchanger, defining between them a space adapted to be traversed by a heat-exchange fluid, are held together and are soldered in a chamber in which the plates are heated by passing a heating fluid, generally an inert gas, through the passages between the plates. The apparatus comprises means for heating and cooling the fluid and a temperature-monitoring device connected to the heating means for controlling the latter. Preferably the heating fluid circulation path includes a drying station.

Abstract: An improved process plug for use during immersion soldering of aluminum heat exchanger coils, such as an air conditioner evaporator. The plug allows the solder to flow into an open bell or female socket of a suction header tube to "pretin" the internal finish of the bell or tube joint while preventing the solder bath from entering the coil. The process plug is designed to achieve a "short" or reduced area joint so that the plug can be readily removed by heating. The suction header tube joint is completed by hand soldering of a precoated male copper transition tube.

Abstract: A method of making porous metal heat sinks from aluminum is described. The sink, in its simplist form, is composed of layers of aluminum wire mesh randomly stacked and brazed together to form a rigid porous metal panel. Devices to be heated (or cooled) are mounted on the panel and forced air passed through the panel creating abundant heat transfer due to large surface area and favorable thermal conductivity of aluminum. Tortuous air passages through the wire mesh create conditions favorable for turbulence which further facilitates heat transfer. Advance in the state-of-the-art is the novel manufacturing method of making a low cost heat sink whose thermal performance is only slightly less than that of higher cost copper wire sinks. A secondary application of the invention is for the formation of metallic filtration material designed for filtering under controlled temperature conditions.

Abstract: A fixture useful both to receive and position parts assembled for brazing and to hold the assembled parts during the brazing process. Part locators in the fixture position the parts during assembly or loading, and remain attached to the fixture during brazing. The locators are influenced to maintain an engagement with assembled parts but are able to yield in controlled directions under expansion resulting from the heat of brazing. The result is to obviate distortion in the brazed article.

Abstract: An improved composite construction and method for fabrication of equipment having a corrosion resistant liner and an additional erosion resistant liner, in critical areas, on a base metal backing.

Abstract: Methods for manufacturing heat exchange panels each comprising metal tubes of finite length welded to a metal sheet except at the end portions of the tubes which are secured to headers in fluid-tight relation thereto, in which methods the metal sheet, having end edges and side edges, is formed into a hollow cylinder with the end edges adjacent each other and metal tubing is welded to the cylinder in a spiral path. Welding is interrupted adjacent the end edges and the tubing is cut above the end edges to provide tubes welded to the cylinder except at end portions of the tubes. The end portions of the tubes, after the cylinder-tube combination is formed to the desired shape, e.g., flat, are secured to the headers. If tubes parallel to the side edges of the sheet are desired, the hollow cylinder is formed with adjacent portions of the side edges in axially offset relation prior to welding the tubing to the cylinder.

Abstract: A layer of tubes is located in an enclosure using a device comprising a pair of parallel strips arranged one on each side of the layer of tubes in a plane transverse to the axes of the tubes, the strips being connected together by tongues which extend from a respective strip towards the other strip, the tongues being inclined to the strips and adjacent tongues of each strip being inclined in opposite directions.

Abstract: A method and apparatus for repairing a radiator having a header and tubes that extend into the header which may develop leaks. The apparatus is made up of a U-shaped rod or wire that is slipped over the tube adjacent the header and the U-shaped rod or wire is soldered in place around the tube.

Abstract: Apparatus for bonding the tubular joints of a heat exchanger using an ultrasonic soldering process in which the heat exchanger structure is heated while the joints thereof are immersed within a molten solder bath thereby preventing excessive amounts of heat from being drawn out of the joint region during the bonding process.

Abstract: This invention relates to apparatus for facilitating the construction of a heat exchanger, such as a condenser or evaporator employed in an air conditioning system, wherein exchanger tubes extending through a plate fin assembly are joined together by means of return bend connections or the like. The ends of the tube are provided with an oval shaped bell in which are telescoped the return bends. Diametrically opposed nibs are formed on the outer surface of the return bend connectors near the distal end thereof. The outside diameter over the nibs is slightly larger than the minor inside diameter of the oval bell. The nibs are inserted into the bell aligned along the minor diameter of the opening. The nibs are thus caused to ride in engagement against the wall of the bell to frictionally support the connector in assembly. The joint is then immersed in a molten solder bath whereby solder flows freely into the joint region along the major axis to create a highly reliable joint.

Abstract: Apparatus for venting a plate fin coil during the ultrasonic soldering of aluminum return bend tubes to the heat exchange tubes in the coil. The apparatus includes a process snorkel member comprising a bored plug for telescoping inside an extension tube extending from an open end of a heat exchange tube forming an end of a circuit in the coil, and a venting tube defining an air conduit from the plug to the atmosphere, whereby the pressure in the interior of the plate fin coil assembly is relieved when the fin coil is immersed in the solder bath.

Abstract: A method of fabricating a solar heating unit having tubular conduits for containing high pressure fluids is disclosed. The method comprises the steps of forming a thin sheet of soft metal, preferably a fully annealed copper sheet, by applying sufficient temperature and pressure to creep or thermally form the sheet in a grooved plate using an assembly of the fluid conduits having a paste solder applied thereon. The solder is melted during the creep forming step to form a good metallurgical bond between the sheet and the conduits.

Abstract: The machine comprises an endless guiding path for mobile supports equally spaced by a distance smaller than the length of the smallest heat exchanger to be brazed. The supports have protruding portions cooperating with the bottom on the same side of the end plates of the heat exchangers.

Abstract: A method of joining metal elements such as heating tubes, pipes, rods, metal cords, or other lengthy elements having similar profiles, with a plate or other flat, molded, metal surface by use of a wire structure which is affixed to at least one of the metal elements at a great number of places.

Abstract: A method of making a heat exchanger in which extended heat transfer material, such as a fin annulus composed of thin corrugated deformable metal, is installed in annular fluid flow paths defined between concentric tubes. Concepts of electromagnetic forming and metallurgical bonding are used in a unique combination of steps to arrive at a method well suited to economical production and which at the same time assures a high efficiency level of heat transfer and leak protection effects.

Abstract: An ultrasonic dip soldering process for bonding the tubular joints of a heat exchanger made up of tubular components joined together to form flow circuits within a fan coil. The joints are positioned adjacent to one of the tube sheets of the fan coil structure and the joints preheated by means of a remote heating process. The joints are then immersed in a molten bath of solder and treated to ultrasonic energy while in the bath.

Abstract: A process and apparatus are provided for assembling a heat exchanger comprising a stack of metallic elements, more particularly a heat exchanger of the cross-flow type.

Abstract: An electron beam collector for a high power electron beam tube has a metallic hollow body for receiving the electron beam, a metallic outer body, and an insulating casing interposed between the inner and outer bodies. A plurality of thin sheet metal fins extend radially outwardly from the outer surface of the hollow body to the inner surface of said insulating casing. The fins are each soldered at their inner ends to the hollow body and at their outer ends to the insulating casing.

Abstract: An ammunition handling system is disclosed having a helical fin of substantially folded plate cross-section made from continuous rectangular ribbons of stock material.

Abstract: A method of forming an airfoil-shaped body is described which includes providing a core with cooling channels recessed into the surface thereof, affixing a calendered multilayer flexible mesh screen substrate to the surface of the core, applying braze alloy and brazing the assembly thereby filling completely the mesh screen pores and bonding further the mesh member substrate to the core, and applying an erosion-corrosion resistant layer over the brazed mesh member substrate completing the airfoil-shaped body.

Abstract: An improved method is disclosed for the soldering together of the cooling assembly of automobile radiators wherein aluminum fins, a first part of the cooling assembly, are etched in a solution consisting essentially of 10 to 14% sodium hydroxide, 4 to 7% zinc cyanide, 20 to 30% technical urea with the balance water for a period of 15 to 30 seconds at a temperature of 32 .degree. to 60.degree. C prior to undergoing treatment with a protective coating and eventual soldering to cooling pipes made of copper, brass, steel or aluminum, the remainder of the cooling assembly.

Abstract: The soldering alloy comprises at least:65 to 85% lead in weight12 to 30% cadmium in weight1 to 6% antimony in weight0.5 to 1% tin in weight.In a method for soldering metal parts, the parts are submitted to an organic flux on the portions thereof to be connected together, said portions are coated with the above mentioned soldering alloy, then they are heated to the liquidus temperature of the soldering alloy while being held together in contact.

Abstract: A rotatable drum type regenerator for an automobile gas turbine engine is manufactured from a steel matrix and rim of thin stock connected in radial sliding and sealing relationship at the hot axis end region to accommodate thermal cycling and to prevent rupture between the rim and matrix, and positively connected by brazing at the cooler axial end region to withstand the various forces therebetween.