Abstract: A method of fabricating a structural panel having a predetermined shape in which an inflatable envelope assembly is formed from at least a pair of superplastically formed and diffusion bonded metallic core sheets. The inflatable envelope assembly can be disposed between first and second metallic face sheets which are generally superplastically formed into the predetermined shape prior to being assembled. Thereafter, the assembled face sheets and the inflatable envelope assembly can be superplastically formed and diffusion bonded to form an integral structure, such as structural panel having a compound curvature. Alternatively, the inflatable envelope assembly can be disposed between a pair of reinforced titanium composite sheets. The reinforced titanium composite sheets can also be joined to adjacent face sheets, such as by welding or diffusion bonding, such that an integral structural panel having the predetermined shape can be readily fabricated.

Abstract: To enable bonding flat and corrugated sheets at their contact points by laser welding or other welding methods while laminating and spirally winding the sheets, a process of producing a metal catalyst carrier for exhaust gas purification in the form of a metal honeycomb column composed of flat and corrugated metal sheets alternately laminated, wound together, and bonded to each other, the process includes the steps of: forming plural openings in a flat sheet of a metal; laminating one piece of the flat sheet having the openings formed therein and one piece of a corrugated sheet of a metal and bonding the laminated flat and corrugated sheets to each other to form a composite sheet; and spirally winding the composite sheet around an axis to form columnar turns each composed of an outer flat layer composed of the flat sheet and an inner corrugated layer composed of the corrugated sheet, while bonding an outer turn and an adjoining inner turn by welding an inner corrugated layer of the outer turn, in a portion ex

Abstract: A method for producing a metal structure, in particular a honeycomb body, especially for a catalytic converter, from at least partly structured, wound, intertwined or stacked sheet-metal layers, includes cleaning the structure in a vacuum in a cleaning chamber, transferring the structure to a process chamber, carrying out a connecting process which may be a brazing operation, transferring the structure to a cooling chamber, and cooling the structure to a predetermined temperature in a vacuum in the cooling chamber. The method is preferably carried out in a three-chamber apparatus and enables shorter production cycles, more economical use of energy, and favorable variation of the surface properties of honeycomb bodies, as compared with previous methods.

Abstract: A method of brazing a honeycomb for air sealing onto a braze surface of the front end of the stationary blade of an axial-flow compressor in accordance with the invention includes the steps of: placing a filler sheet between the honeycomb and the braze surface; constraining the honeycomb in the seal width direction so that the seal width direction of the honeycomb corresponds to the seal width direction of the braze surface while keeping the figure of the honeycomb at the same curvature with that of the braze surface; and heating the assembly to braze the honeycomb and the braze surface.

Abstract: A method of fabricating a structural panel having a predetermined shape features forming an inflatable envelope assembly from at least a pair of superplastically formed and diffusion bonded metallic core sheets. The inflatable envelope assembly can be disposed between first and second metallic face sheets which are generally superplastically formed into the predetermined shape prior to being assembled. Thereafter, the assembled face sheets and the inflatable envelope assembly can be superplastically formed and diffusion bonded to form an integral structure, such as structural panel having a compound curvature. Alternatively, the inflatable envelope assembly can be disposed between a pair of reinforced titanium composite sheets. The reinforced titanium composite sheets can also be joined to adjacent face sheets, such as by welding or diffusion bonding, such that an integral structural panel having the predetermined shape can be readily fabricated.

Abstract: There is provided a process for brazing a first coated part to a second metal part which includes the steps of cleaning or masking, the surfaces of at least the first metal part, interposing a brazing metal foil between the metal parts, and induction heating the assembly to fuse the brazing metal foil, whereby the parts are adhered together, and then cooling. A controlled heating profile is disclosed.

Abstract: According to the present invention, there is provided a process for producing a honeycomb body for a metallic carrier from a flat foil and a corrugated foil, which comprises supplying a joining agent comprising a mixture of an adhesive with a carbon powder into abutted portions between the flat foil and the corrugated foil, depositing the joining agent onto the abutted portions to form a honeycomb body and heat-treating the honeycomb body only or an outer cylinder with the honeycomb body being inserted thereinto in a non-oxidizing atmosphere to mutually join the abutted portions in a liquid phase.

Abstract: The present invention is a honeycomb panel comprising metal face sheets respectively disposed on upper and lower faces of said honeycomb core characterized in that said honeycomb panel has a metal side plate disposed on at least one side face thereof, for mutually connecting honeycomb panels to each other, and a process for producing a honeycomb panel, said process characterized by comprising the steps of: welding a corrugated honeycomb core at an end face of its corrugation to a side plate along the end face of said corrugation; welding the honeycomb core at top portions of its corrugation to an upper face sheet from the side of the honeycomb core by means of an energy beam; welding bottom portions of the corrugation of the honeycomb core to a lower face sheet from the side of the face sheet by means of an energy beam; and welding the face sheets to the side plate before or after welding the honeycomb core to the face sheets.

Abstract: The present invention aims to produce a metallic carrier which enables a catalyst to be activated in a short time. In mutually joining an insulated heat resisting alloy and a heat resisting alloy having an insulating film, particularly composed mainly of alumina, a joining material of a laminate, formed by laminating a strongly reducing metal, which can thermodynamically reduce alumina, and a brazing material to each other, is disposed so that the strongly reducing metal comes into contact with the insulated heat resisting alloy, and the resultant laminate is heated in a non-oxidizing atmosphere to carry out a brazing treatment. This enables only portions in the honeycomb structure, where electrically conductive paths are to be formed, can be joined, and, at the same time, heat resisting alloys having a surface covered with an insulating oxide film can be firmly joined with the resultant joint having an electrical conductivity.

Abstract: An anode bar for utilization during the production of molten metal by electrolysis is produced from a metal sleeve, a metal rod and a metal ring. The metal rod is placed in internal telescopic relationship to both the sleeve and the ring with an end of the rod being positioned at least partially within an opening of the ring to define therewith a cavity. The ring and sleeve are welded together, the rod end and ring are welded together, and during the welding of the rod end and the ring, the cavity is at least partially filled with the weld.

Abstract: A method for applying brazing material to a metal structure includes applying a sticky material maintaining adhesiveness up to temperatures of at least 180.degree. C. and preferably above 200.degree. C., to at least a subregion of the structure. Then brazing powder is applied which continues to adhere to the sticky material. After the application of the brazing powder but before an actual brazing process, the structure is heat treated without the brazing powder falling out during the heat treatment or during ensuing handling steps. The heat treatment may be a heat-degreasing of the structural parts that do not have or do not yet have brazing material applied to them.

Abstract: An apparatus for catalytically decontaminating exhaust gases, preferably for motor vehicle engines, includes a metal carrier body having a plurality of corrugated, or smooth and corrugated, sheet metal layers. The sheet metal layers have smooth end segments overlapping one another and being disposed as an outer layer on the periphery of the metal carrier body. A jacket encompasses the metal carrier body. At least one weld seam may simultaneously connect the smooth end segments to one another and to the jacket. A mechanical retaining device may form-lockingly secure the metal carrier body in the axial direction in the jacket while engaging an end surface of the outer layer.

Abstract: A method for Sheet Meta) and Thermoplastic Adhesive Bonded Assemblies and Brazed Bonded Assemblies in 360.degree. Shapes.Abstract: A method for preparing and bonding Sheet Metal Adhesive Bond Shapes and Thermoplastic Bond Shapes and Brazed Bonded Shapes utilizing forming dies as bond tools and using the sheet metal inner shape as a pressure vessel for effecting an adhesive or brazed bond.

Abstract: A core structure, apparatus, and method which utilize laser bonding to fabricate the core structure. The core structure is characterized by laser bonds in patterns between adjacent sheets of aluminum, stainless steel, and titanium foil which create honeycomb core structures when the bonded stack of sheets is expanded by the application of tensional forces thereto. The apparatus achieves the fabrication of the core structure and the steps of the method are practised by either hand or utilization of the apparatus.

Abstract: A method for applying brazing material to an approximately metallic honeycomb body being wound, stratified or intertwined from at least partly structured sheet-metal layers, for brazing at least in partial regions, includes applying a thin film of a rolling oil to at least the structured sheet-metal layer, if such a film is not already present from production process; heat-treating the oil film to remove volatile components; placing regions of the sheet-metal layers to be provided with brazing material into contact with an aqueous solution of a surfactant; and putting the honeycomb bodies produced from the sheet-metal layers into contact with powdered brazing material adhering to locations where residues of the oil and the surfactant have come together. An apparatus for applying the brazing material to the honeycomb includes a heating station for passing a flow of hot air through a honeycomb body and heat-treating an oil film at a temperature of approximately 150.degree. to 250.degree. C. and preferably 200.

Abstract: A fluted tube, defined by a multiplicity of parallel flutes extending over the length of the tube, is constructed by providing a flat portion of sheet metal, forming a series of undulations in one portion to form a corrugated section which is allowed to adjoin and be continuous with a flat section at a transition line or point. The sheet is engaged with tynes at the transition point and simultaneously welded as it is rolled into a spiral to form a multiplicity of flutes each bound by an undulation and a portion of the flat sheet metal. The flat sheet section can have a sufficient length so that it defines the last exterior layer of the spirally wound fluted structure to form a smooth walled, tubular envelope.

Abstract: Two metal objects are bonded together by positioning a brazing composite on the surfaces that are to be bonded together and heating the metal objects causing the composite to disintegrate with brazing alloy that is held in the composite melting to bond the two surfaces together. The composite is a combination of the brazing alloy and fibrillater polytetrafluoroethylene. This product which is very malleable can be formed to any desired shape to facilitate bonding a variety of different objects together. It is particularly useful for bonding honeycombed objects to metal surfaces.

Abstract: A method to superplastic form sandwich structures is provided. A series of worksheets are joined together at selected locations through the use of partial penetration welding. The worksheets are subsequently superplastic formed in order to form a sandwich structure. The method allows a different number of worksheets to be used at different points throughout the sandwich structure. This results in a sandwich structure with a different internal reinforcement at different locations in the sandwich structure. In the preferred embodiment, a wing is fabricated from a series of worksheets partial penetration welded together using a laser. The worksheets are superplastic formed to producing a wing with a different internal reinforcement at two or more locations in the wing.

Abstract: A rotary machine which includes a stator assembly 36 having a seal assembly 38 is disclosed. Various structural, details are developed which improve the structural integrity of the seal assembly during fabrication. In one detailed embodiment, the seal assembly includes a substrate 42 having angled surfaces 44, 46 facing a flowpath 24 for working medium gases which intersect at an obtuse angle region I and an axially continuous metal structure 48 which is attached to both surfaces and extends across the obtuse angle region.

Abstract: A member for a honeycomb core or panel that can be bent with various radii of curvature, can contour a compound curvature and can support a load perpendicular to the defined curvature. The honeycomb member, preferably, has cells having an equilateral triangular cross section. The cells are defined by rectangular bottom, top and side faces. The connecting angle between each bottom face and each side face is typically about 60 degrees. The adjoining sides of the bottom faces contact each other. The adjoining sides of the top faces also contact each other. Although the cells contain a small orifice between adjoining sides, the cells have the same strength as that of completely enclosed cells. Furthermore, the relative position of the adjoining cells can be easily altered.

Abstract: Catalytic converter carrier bodies have a jacket and adjacent layers of corrugated or smooth and corrugated metal foils wound or layered in the jacket. The metal foils contact each other and contact the jacket at connecting points, defining flow channels between the metal foils and between the metal foils and the jacket and defining brazing gaps at the connecting points. A method for brazing the carrier bodies includes initially dispersing powdered brazing material with a suitable particle size in a mixture of binder material and liquid. The flow channels are flooded with the liquid mixture for depositing the brazing material in at least some of the brazing gaps. Excess mixture is subsequently removed from the flow channels and the carrier body is then brazed.

Abstract: A rotary machine which includes a stator assembly 36 having a seal assembly 38 is disclosed. Various structural, details are developed which improve the structural integrity of the seal assembly during fabrication. In one detailed embodiment, the seal assembly includes a substrate 42 having angled surfaces 44, 46 facing a flowpath 24 for working medium gases which intersect at an obtuse angle region I and an axially continuous metal structure 48 which is attached to both surfaces and extends across the obtuse angle region.

Abstract: Method and apparatus for installation of honeycomb core seals in jet engine mounting rings, including spray deposition of brazing alloy in seals and establishment of compressive relationships between seal and ring prior to brazing of seal in ring.

Abstract: A method and apparatus for bonding high temperature structures, such as face sheets to high performance honeycomb cores, using differential gas pressure at high temperatures. A high temperature resistant, foil sheet having a thickness of from about 0.0005 to 0.003 inch is welded to a support to form a vacuum bag to surround the structure to be bonded. A vacuum line is connected to the bag to allow evacuation of the bag. Typically, the structure is bonded in a vacuum furnace. Initially, the furnace is heated to the bonding temperature of the assembly while both the furnace chamber and the vacuum bag are substantially completely evacuated. Then slight pressure is allowed to return to the chamber to force the foil sheet into intimate presure contact with the structural assembly to bring the components tightly together, using the relative pressure different between the vacuum in the chamber and the vacuum within the bag.

Abstract: A method is provided for making a passenger car body structure which has a panel assembly forming at least part of a side, the roof, and end of the floorplate. Each panel has inner and outer spaced metal sheets and a cellular metal core brazed to the sheets and maintaining them spaced apart. To join the panels, a metal connecting member is joined to at least one of the inner and outer sheets and has a projection for use in welding the panel to the neighboring panel. The projection extends in the lateral direction of the panel and is preferably of material thicker than the general sheet thickness of the sheets. A frame member of the body structure may be welded to the panels at the joint.

Abstract: Laminated structural panels and the method of producing them involve selection of a desired member of sheets of sheet metal of the desired thickness and material, perforating one or more of the sheets to a desired pattern depending upon characteristics desired such as lightness, stiffness or inclusion of fluid passageways etc., stacking the perforated sheets with imperforate face sheets top and bottom and, with brazing material at the interface between the sheets, subjecting the stack to a temperature high enough to cause melting of the brazing material while maintaining a very high vacuum environment. In an alternative embodiment, one or more imperforate internal sheets may be interleaved between the perforated sheets.

Abstract: A method for pre-oxidizing a nickel alloy honeycomb core by heating the core while exposing the core to a controlled flow of an oxygen containing gas, such as dry air. The preoxidized core can be brazed in a vacuum furnace to two face sheets to manufacture a honeycomb panel using thin foil brazing material. The methods of preoxidation and panel production for Inconel 718, Rene' 41 and Inconel 625 are specifically described.

Abstract: Process for making a panel structure by superplastic forming from a pair of face sheets disposed on opposite sides of a core sheet, the core sheet being bonded as by welding to the face sheets along a plurality of spaced weld areas, the core sheet and face sheets having superplastic characteristics, which comprises placing a restraining sheet of superplastic material in contact with one of the face sheets and subjecting the forming pack of the face sheets and core sheet, together with the restraining sheet, to superplastic forming in a die while applying a back pressure against the restraining sheet. The back pressure is lower than the internal pressure and maintains the restraining sheet in contact with the adjacent face sheet while maintaining the other face sheet in contact with a surface of the die.

Abstract: A process for manufacturing a honeycomb body having a multiplicity of at least partly structured metal sheets defining a multiplicity of channels through which a fluid can flow includes stacking at least partly structured metal sheets into a plurality of bundles of metal sheets having ends. Each bundle is folded about a respective bending line defining a folded edge of each bundle and the folded edges are simultaneously or subsequently moved toward a central region. The ends of the folded bundles are entwined in the same direction, such as by rotating the central region and contracting a form surrounding the bundles. The entwined bundles are encased in a prefabricated jacket by pushing the entwined bundles into the prefabricated jacket or surrounding the entwined bundles with the prefabricated jacket.

Abstract: A method for eutectically attaching a silicon chip to a gold-coated substrate. Prior to heating and scrubbing of the silicon chip against the gold surface, a gold lattice structure is placed between the silicon chip bottom surface and the gold surface. The gold lattice structure contacts the silicon chip bottom surface over an area equal to less than ten percent of the total surface area of the chip bottom surface. The point source contact between the gold lattice and silicon chip promotes formation of the gold/silicon eutectic alloy at temperatures of between 400.degree. to 475.degree. C. The gold/silicon eutectic alloy spreads between the silicon chip bottom surface and gold top surface to provide eutectic bonding. The method is especially useful in bonding relatively large silicon chips or dies to gold-coated substrates wherein the bottom surface or back side of the chip is not coated with a protective metal layer.

Abstract: A heat resistant structure of a honeycomb type which is used for a catalytic reactor for purification of exhaust gases in the internal combustion engine of a motor vehicle. A catalytic carrier matrix is prepared by joining a corrugated sheet and flat sheet which are alternately placed in layers in a wound from. A pair of pieces of brazing materials made of amorphous alloy are interposed along the longitudinal direction of the matrix at predetermined intervals in the width direction of the matrix. A pair of pieces of said brazing material interposed at both end portions of the matrix face each other across the flat sheet and are deviatedly placed from each other in the width direction of the matrix.

Abstract: When soldering a honeycomb body formed by alternately piling flat foils (plates) and corrugated foils (plates), a binder liquid is sucked up from the end face of the honeycomb body to form a binder streak in a space defined by contacting portions of the flat foil (plate) and corrugated foil (plate), a solder is scattered and applied onto the binder streak, and the honeycomb body is then dried and heated to effect a soldering of the honeycomb body. According to this method, soldering can be accomplished only in the vicinity of the contacting portions of the flat foil (plate) and corrugated foil (plate), with a desired soldering structure.

Abstract: A metal-made carrier body is fabricated for an exhaust gas cleaning catalyst. At least one sheet-like metal band and at least one corrugated metal band, each of said bands being made of a thin metal sheet, are superposed one over the other so as to establish contacts therebetween, thereby forming a multi-layered composite body defining a number of network-patterned gas flow passages along the central axis thereof. The composite body is dipped in an electroless plating bath capable of forming a brazing coating layer on the composite body so as to form a brazing coating layer at least in the vicinity of each contact except for the contact itself. The composite body is then subjected to a heat treatment so as to braze the contacts between the sheet-like metal band and corrugated metal band. Before dipping the composite body in the plating bath, it may optionally be enclosed in a cylindrical metal casing. The composite body and cylindrical metal casing are also brazed together at their mutual contacts.

Abstract: A method is described of diffusion bonding and superplastic forming components made of aluminium or an aluminium alloy to form a composite formed article. The method involves applying stopping-off material to selected areas of the components to prevent diffusion bonding in those areas, the stopping-off material being applied by plasma spraying.

Abstract: Methods of making superplastically formed and diffusion bonded articles are disclosed as well as the articles made from such methods. Metal sheets are superplastically formed and diffusion bonded in a manner such that pillows are formed on respective outer surfaces thereof, providing a cellular structure interconnected by channels permitting control of gas pressure with the cells. The cellular structure can, in one embodiment, be twisted and the cells can be inflated through superplastic forming. The twisted cellular structure is particularly useful as an intermediate stiffener for an airfoil.

Abstract: A method of producing a honeycomb body including a stack of structured metal sheets disposed in layers at least partially spaced apart from each other defining a multiplicity of channels through which gases can flow, the stack having ends twisted in mutually opposite directions about at least two fixation points, and a jacket tube surrounding the sheets and being formed of at least one segment, the sheets having ends joined with the jacket tube.

Abstract: A method of manufacturing thermal barrier structures comprising at least three inner dimpled cores separated by flat plate material and having outer surfaces of the flat plate material, all elements being joined together by liquid interface diffusion (LID) bonding.

Abstract: A primary multi-layer structural component having insulation properties and the method of producing same is disclosed. The structure is comprised of opposing spaced apart face sheets, a plurality of internal core sheets, the core sheets being spaced apart from each other and from the face sheets. Truss means extend internally across the structure, the truss means being connected to and supporting the opposing face sheets, and being integrally connected to and supporting the core sheets. Such structure is produced by forming a stack of metal sheets in contact with each other, including a pair of outer face sheets and a plurality of core sheets positioned between the face sheets, and providing a predetermined stop-off pattern by placing stop-off material in certain preselected areas between the contacting surfaces of adjacent faces sheets and core sheets, and of adjacent core sheets.

Abstract: Processes for producing titanium aluminide SPF/DB components, particularly structural panels, are provided. In one embodiment, the process comprises providing rapidly solidified titanium aluminide alloy sheetstock, providing a plurality of rapidly solidified titanium aluminide alloy ribbons or strips, forming the ribbons into waveform structures, assembling a plurality of these waveform structures to produce a honeycomb core, positioning this core between face sheets, and bonding the core to the face sheets. In another embodiment, the process comprises providing rapidly solidified titanium aluminide alloy sheetstock, superplastically forming at least one piece of sheetstock into a shaped piece having spaced apart, parallel bonding regions, positioning this shaped piece between two face sheets, and bonding the shaped piece to each face sheet.

Abstract: A method and apparatus for forming and bonding metal assemblies using an internally heated chamber. The parts can be both superplastic formed and diffusion bonded to other parts. A closable chamber contains a heating element near the chamber center. A ceramic die at least partially surrounding the heating element has a forming surface toward the heating element. The inner wall of the chamber is lined with a pressure bladder. A granular material, conical ceramic support, or extensible bladder fills the space between ceramic die and chamber inner wall. With the chamber closed, the heater is activated while an inert gas under pressure is introduced between heater and die and the bladder if used is pressurized. The bladder or packed granules support the outer die surface while the gas pressure presses metal parts on the die forming surface against the die. The metal parts are formed and bonded together by the substantially isostatic forces thereon.

Abstract: A method of diffusion brazing two or more titanium alloy metal parts, such as sheets, thick sections or a honeycomb core to one or two face sheets, to form a unitary panel. A low melting copper-nickel layer is interposed between the faying surfaces of two parts to be bonded. The layer may be a foil placed between the surfaces or may be a layer plated onto one or both surfaces. The assembly is heated to at least the eutectic melting temperature of the base metal-interlayer eutectic point for a time sufficient to permit effective wetting and diffusion bonding of the surfaces. The assembly is held at the elevated temperature a sufficient additional time so as to allow isothermal solidification to occur. The assembly is then cooled, resulting in a unitary structure. This method is particularly effective with titanium aluminides face sheets and a titanium aluminide or other titanium base honeycomb core and with an interlayer consisting essentially of nickel and copper.

Abstract: A porous metallic material of the present invention is constructed of a laminate consisting of an expanded metal and a fibrous metallic fiber both of which are pressed to be joined to each other under pressure. This porous metallic material is excellent in bending strength and workability. The porous metallic material may be laminated to a honeycomb structural element and a rigid plate so as to form a porous structural material. To this porous metallic material may be also laminated a decorative layer so as to form a porous decorative sound absorbing material. The present invention provides the above-mentioned products and method for manufacturing the same.

Abstract: A method for producing honeycomb-like brazed metallic catalyst carrier bodies, includes applying brazing material to thin structured metal sheets, subsequently heating areas to be brazed with laser beams producing brazed connections, and rolling or laminating the metal sheets in alternating layers. An apparatus for producing the bodies and the bodies themselves are also provided.

Abstract: Method for eliminating core distortion in diffusion bonded and superplastically formed structures or panels, wherein metal blanks or workpieces of metal, capable of diffusion bonding and superplastic forming such as a titanium alloy, preferably in the form of thin sheets of the order of 0.030 inch thick or less, are placed in contact with each other in a tooling apparatus or die, the sheets are joined at selected areas by diffusion bonding and are then expanded superplastically to form a desired panel or a truss core panel structure. In such method, the metal sheets are diffusion bonded at certain preselected areas under pressure and at elevated temperature, and the unbonded areas of the sheets are then expanded by superplastic forming into contact with the walls of the tool or die cavity, at elevated temperature e.g., 1600-1650.degree. F. and an internal gas pressure e.g., about 300 psi, to form the desired panel.

Abstract: A method of manufacturing thermal barrier structures comprising at least three dimpled cores separated by flat plate material with the outer surface of the flat plate material joined together by diffusion bonding.

Abstract: The apparatus is for welding grids, particularly for a nuclear fuel assembly, constituted by two sets of strips at right angles and whose terminal portions are made fast to a belt. It comprises, in an enclosure with a controlled atmosphere provided with a lock, a double cross movement table bearing at least one orientation device and which is capable of bringing each surface and each side of the grid in its turn into an orientation perpendicular to the firing line of a radiation welding member and to move the frame in two directions perpendicular to the firing line, so as to bring each spot to be welded in its turn opposite the firing line. The orientation device and the table are provided with control motors and constitute an automation for presenting all the weld spots to be formed successively opposite the firing line.

Abstract: A process for brazing a metal face sheet to a honeycomb core to form a composite member. A brazing alloy is placed between the face sheet and the core. Rigid thermal insulation is used to press the face sheet against the core while heating the structure with induction heating for a time just sufficient to melt the brazing alloy. The portion being brazed is covered by an inert gas when it is at elevated temperatures. The rapid heating and cooling of the brazing alloy by induction heating joins the face sheet to the core without excessive energy consumption or the need for a complex vacuum system.

Abstract: A method of forming thin, uniform braze joints is effected through the use of curtain coating. Braze powder is admixed with a liquid polymeric binder to form a slurry. The slurry is forced through the slots in a curtain coating head and deposited on at least one of the metal surfaces to be bonded together. The method has particular utility for bonding fin/plate sections of a heat exchanger where the fins have a U-shaped cross section. The slurry is deposited on the top portion of the fin and the side portion of the fin and wiped from the top portion leaving braze material primarily on the side wall portion. When the plates are contacted to the fins and heating performed, a bond is effected with maximum plate-to-fin contact for high heat transfer and a strong braze joint.

Abstract: A stiffened composite metal panel is made by providing a layer of metal with spaced grooves of a depth less than the thickness of the metal layer for defining separable strips of the layer and, after arranging stripes of bond-preventing material between limited portions of the respective separable strips and a second metal layer, the metal layers are passed between pressure bonding rolls with reduction in the thickness of the layer materials to metallurgically bond a portion of each separable strip to the second metal layer to form a composite metal panel while leaving a portion of each separable strip free of such bonding at the location of the bond-preventing stripe. The separable strips are then broken apart along the grooves and folded away from the second metal layer to form precisely located stiffening ribs in the composite panel.

Abstract: When soldering a honeycomb body formed by alternately piling flat foils (plates) and corrugated foils (plates), a binder liquid is sucked up from the end face of tile honeycomb body to form a binder streak in a space defined by contacting portions of the flat foil (plate) and corrugated foil (plate), a solder is scattered and applied onto the binder streak, and the honeycomb body is then dried and heated to effect a soldering of the honeycomb body. According to this method, soldering can be accomplished only in the vicinity of the contacting portions of the flat foil (plate) and corrugated foil (plate), with a desired soldering structure.