Abstract: The invention is a method of repairing an aperture and adjacent defect in a part which is started by removing one or more defects adjacent an aperture in a base material. The material is removed to create a weld seam that extends past an area of high stress concentration on the aperture. An insert of material containing a profile that corresponds to the profile of the base material removed adjacent the aperture and a combination top and runoff plate that encompasses the insert of material are provided. A backing plate is inserted underneath the combination top and runoff plate and insert such that there remains an air space between the backing plate and the combination plate which prevents the combination plate from becoming fused to the backing plate during a welding process. The insert is welded to the base material, and the backing plate is removed.

Abstract: The present invention provides a method of weld repairing an impeller by use of a weld restraining fixture. The fixture is used to sandwich the impeller between a base plate and a top ring such that a plurality of tangs located on the top ring rest on the plurality of valley faces of the impeller. The top ring and base plate are bolted together while the restrained impeller is welded and heat treated.

Abstract: The invention concerns a method to create fusion-integrated joints of workpieces, in which a workpiece area formed on a workpiece made from a TiAl alloy and a workpiece area formed on another workpiece made from a TiAl alloy or a different high temperature material are joined in a joint area using a joining additive, where the joining additive contains at least one of the elements gallium and indium. The invention also concerns a method to create a material deposit on a workpiece, in which a deposit material is applied to a workpiece area made from a TiAl alloy, where a fusion-integrated joint is produced between the deposit material and the workpiece area, where the deposit material contains at least one of the elements gallium and indium and a filler material.

Abstract: A quantity of particles (28) may be cold-sprayed toward the distal surface (22) of a turbine blade (6) at a temperature below a melting point of the particles at a velocity sufficiently high to cause at least a portion of the particles to adhere to the surface to form squealer ridge (24) with a desired cutting profile. The cutting profile may be defined by a face (52) and a land (54) disposed at a relief angle (38) relative to a direction of motion (58) of a cutting edge (48). The ridge may be built by multiple passes of a cold spray gun depositing sequential layers (30, 32, 34) of varying widths. An in-service blade having worn distal surface may be repaired using this technique.

Abstract: 7xxx aluminum alloy weld filler alloys and methods of using the same are described. The 7xxx aluminum alloy weld filler alloys may be used to repair 7xxx alloy products. The repaired volume of the 7xxx alloy products may be substantially crack-free, and may facilitate reuse of the repaired 7xxx alloy products.

Abstract: To repair the blade, a patch is welded by an electron beam. The method starts by machining the damaged zone so as to obtain a zone to be repaired having a defined profile; welded on to a first test piece element corresponding to the blade, having said defined profile, is a second test piece element, corresponding to the patch, in order to obtain a start-of-run test piece; the quality of this test piece is verified and, if it corresponds to the repair acceptance criteria, the patch is welded on to the zone to be repaired using the same electron-beam welding machine without changing its operating parameters, and the repaired zone is reworked by machining.

Abstract: The system contains a laser beam source and a work piece having a soldered joint. A work piece holder holds the work piece at an angle relative to the laser beam source. A crack is formed in a soldered joint of the work piece. The laser beam source is positioned approximately centered on the crack. At least one temperature sensitive electronic element is contained within the work piece.

Abstract: The present invention relates to a guiding device (40) configured to guide equipment units for joining pipe sections which are arranged in a substantially upright position. The guiding device comprises a stationary body (41), one or more movable carriers being movably supported on said stationary body and configured to revolve one or more equipment units about a pipe section, a pipeline engagement device (63) configured to engage said guiding device with said pipe section and to support said stationary body, and one or more adjustable supports (44), said one or more adjustable supports being configured to make adjustment possible of a working plane of one or more equipment units (47, 48, 49) mounted on or to be mounted on said one or more carriers with respect to a pipe section on which the guiding device is mounted.

Abstract: A method of repairing a hole in a work piece includes mechanically constraining donor plates against a work piece. Constraint plates keep donor plates flush against the work piece during conductive heat resistance welding. By constraining the donor plates, the molten mixture produced by conductive heat resistance welding cannot escape the hole and a weldment substantially free of voids is formed.

Abstract: A process for repairing a damaged portion of a thermal barrier coating on a turbine engine component includes sintering a mixture comprising particles of a bond coat and particles of a brazing alloy to form a composite preform; depositing a thermal barrier coating on the composite preform; contacting the composite preform with the deposited thermal barrier coating with an uncoated surface of the damaged portion of the turbine engine component; and heating the composite preform with the deposited thermal barrier coating to a temperature effective to form a brazed joint between the composite preform and the uncoated surface of the damaged portion of the turbine engine component.

Abstract: A process and braze paste suitable for filling and closing voids in relatively thin wall sections of high temperature components, such as an impingement plate of a combustor of a gas turbine engine. The process entails applying at least a first braze paste to the crack to form a braze paste patch comprising powders of first and second alloys and an organic binder. The first alloy has a higher melting temperature than the second alloy, and the powders of the first and second alloys are present in the braze paste patch at a weight ratio of about 30:70 to about 70:30 weight percent. The braze paste patch is then heated to burn off the binder and melt at least the powder of the second alloy to form a brazement within the crack that contains particles of the first alloy dispersed in a matrix formed by the second alloy.

Abstract: A repair method of propagating epitaxial crystalline structures is provided. The repair method broadly comprises the steps of providing a substrate to be repaired, placing an additive material as a preformed shape onto an area of the substrate to be repaired, utilizing a heat source to heat an entire volume of the additive material and an area adjacent to the additive material to within 0-100° F. of their solidus temperatures, holding at the fusion temperature for a time sufficient to allow grain growth and orientation to occur, and ramping down the heat source at a predetermined controlled rate until solidification is complete.

Abstract: A Ni-based brazing composition at least containing, in mass %, 1.0% or more and 1.3% or less of B, 4.0% or more and 6.0% or less of Si, and the balance consisting of Ni and unavoidable impurities, wherein the brazing composition forms wherein the brazing composition forms dispersed phase containing B or Si in a metal texture after the brazing, and a maximum length of the dispersed phase is 30 ?m or less.

Abstract: Methods and articles for receiving times and temperatures for stages of a profile including solder heating stages to rework a populated printed circuit board (PCB), the rework including removing a first integrated circuit (IC) from the PCB, focusing heat on the first integrated circuit using an oven element during rework of the PCB, collecting actual temperature information from a plurality of temperature sensing elements to detect actual temperature information associated with the first integrated circuit, and generating a suggested modification for an operator to modify the time and/or the temperature of at least one of the stages in the profile in response to a fail status indicating that the collected actual temperature information did not meet temperatures for a variable.

Abstract: A process for heating a braze alloy by microwave radiation so that heating of the alloy is selective and sufficient to cause complete melting of the alloy and permit metallurgical bonding to a substrate on which the alloy is melted, but without excessively heating the substrate so as not to degrade the properties of the substrate. The process entails providing metallic powder particles having essentially the same metallic composition, with at least some of the particles being sufficiently small to be highly susceptible to microwave radiation. A mass of the particles is then applied to a surface of a substrate, after which the mass is subjected to microwave radiation so that the particles within the mass couple with the microwave radiation and sufficiently melt to metallurgically bond to the substrate. The microwave radiation is then interrupted and the mass is allowed to cool, solidify, and form a solid brazement.

Abstract: Provided is a method of repair which method is capable of holding a molten brazing material at the bonding portion when a component is bonded with a brazing material to an inclined or to a curved surface. The method of repair repairs by brazing a repair portion in which a crack has developed and which needs repair, wherein a brazing material support (4) holding in the interior thereof a molten brazing material (5) is brought into contact with the repair portion, and under the condition that the brazing material support (4) is in contact with the repair portion, the molten brazing material (5) is solidified. Under the condition that the brazing material (5) in a powder form is brought into contact with the brazing material support (4), the brazing material (5) can be melted by heating to a temperature at or above the melting point of the brazing material (5).

Abstract: A method for repairing a gas turbine engine component includes identifying a distorted feature located in a first portion of the component, identifying a second portion of the component that behaves as at least one of a heat sink or a stiffener, removing the second portion of the component from the first portion, cold working the first portion of the component to repair the distorted feature, heat treating the first portion of the component, and metallurgically joining the first portion of the component to the second portion of the component.

Abstract: A method to improve the impact resistance of a braze joint between a tungsten/carbide/cobalt substrate and a substrate including titanium or alloy thereof includes utilizing a brazing material including gold, nickel, and copper present in respective amounts to improve the ductility of the braze joint.

Abstract: A solder repairing apparatus includes a stage designed to place the surface of at least a specific part of an object along a reference plane within a specific spot defined on the stage. A heating unit applies a thermal energy to the specific spot. A dividing plate is designed to move into the specific spot in a vertical attitude perpendicular to the reference plane. The dividing plate exhibits a low solder wettability. The solder melts in response to the application of the thermal energy. When the dividing plate in the vertical attitude enters the specific spot, the dividing plate gets into the solder. Since the dividing plate exhibits a low solder wettability, the dividing plate repels the solder. The solder is divided into two parts. The division of the solder reliably eliminates a short circuit in the electronic circuit.

Abstract: A welding method for manufacturing welded structures having excellent properties to prevent the propagation of brittle fracture occurring in welded joints, characterized by the step of forming a repair weld having a greater toughness than that of a butt weld and an outer edge whose angle ? with respect to the longitudinal direction of the butt weld is not less than 10 degrees and not more than 60 degrees, by applying repair welding to a region to arrest a brittle crack in a butt-welded joint where a brittle crack is likely to propagate after removing part of the butt-welded joint, in said region, by gouging or machining.

Abstract: The present invention provides a low-melt nickel-based alloy powder applied in an activated diffusion brazing repair on gas turbine components. In one embodiment, and by way of example only, the low-melt alloy powder comprises between about 6.7% and about 9.2% by weight Cr, between about 9.7% and about 10.3% by weight Co, between about 3.7% and about 4.7% by weight W, between about 3.3% and about 6.3% by weight Ta, between about 3.6% and about 5.2% by weight Al, between about 1.3% and about 4.0% by weight Hf, between about 0.02% and about 0.06% by weight C, between about 1.0% and about 3.2% by weight B, and Ni. Optionally, the low-melt alloy powder may include between about 1.4% and about 3.2% by weight Re.

Abstract: A method for repairing an article comprises providing an article, providing a repair material, and joining said repair material to said article. The repair material comprises, in atom percent, at least about 50% rhodium; up to about 49% of a first material, said first material comprising at least one of palladium, platinum, iridium, and combinations thereof; from about 1% to about 15% of a second material, said second material comprising at least one of tungsten, rhenium, and combinations thereof; and up to about 10% of a third material, said third material comprising at least one of ruthenium, chromium, and combinations thereof. The repair material comprises an A1-structured phase at temperatures greater than about 1000° C., in an amount of at least about 90% by volume.

Abstract: The repair of cracks according to the state of the art comprises the fact that defects located on the inside must be worked outward in order to be able to be welded closed. The method according to the invention proposes not to work out cracks located on the inside, but to melt the crack located on the inside utilizing a flux agent.

Abstract: Methods for repairing gas turbine engine components are provided. In this regard, a representative method includes: applying a surface treatment to the component such that locations at an exterior surface of the component exhibiting inter-granular attack are protected from erosion during a cleaning process; and cleaning the component using hydrogen fluoride ion cleaning to clean the component.

Abstract: A method for the repair of a component by a solder is disclosed. The method is performed under specifically selected vacuum conditions in order to prevent oxidation and vaporization.

Abstract: A gas turbine engine includes alternating rows of rotary airfoils or blades and static airfoils or vanes. The vanes are made of a base metal, such as cobalt or nickel superalloy. If a crack forms in one of the vanes, a braze alloy is applied to the crack. The braze alloy is a powdered slurry. The braze alloy includes approximately 50 to 100% of a base material and approximately 0 to 50% of a braze material. The base material of the braze alloy has the same composition as the composition of the base metal of the vane. The airfoil is then exposed to microwaves which melt the braze alloy in preference to the base metal to repair the crack in the vane.

Abstract: In one embodiment, the present invention relates to a method and system of determining the weld bead sequence on a mechanical component is disclosed. In one specific embodiment, the sequence is determined by numerical analysis of a plurality of weld bead sequences to determine the weld bead sequence. Then, after this sequence is determined, a weld overlay is placed onto the mechanical component using the sequence. In particular embodiments, a weld bead sequence is applied to a boiler tube panel wherein the sequence begins at the crown of the tube, progresses down the walls of the tube to the tube and membrane interface, and concludes on the membrane. The new bead sequence reduces residual and distortional stresses as created by applying a weld overlay.

Abstract: A method for repairing a rotor of a turbine includes providing a rotor having a groove portion defined by a circumferential portion of the rotor. The circumferential portion of the rotor is removed to create an opening to provide access to the groove such that the opening, immediately adjacent the groove, is narrower than the groove. A guide block may be extended into a receiving slot separating a first protruding surface from a second protruding surface of the rotor such that a weld area slot of the guide block extends over at least a portion of the opening. The opening may be welded adjacent the guide block to close at least a portion of the opening.

Abstract: A method for remanufacturing an electronic assembly includes removing a first portion of an assembly housing to expose an underside of an enclosed circuit assembly. One or more solder joints on the underside of the circuit assembly are associated with at least one component that is also affixed to a portion of the housing. The opened electronic assembly is lowered onto a desoldering fixture having a plurality of solder pots configured to encompass, and thus desolder, the solder joints associated with the component that is affixed to a portion of the housing. Once the affected solder joints are melted, the remaining portion of the housing and the component affixed thereto may be lifted away, exposing the top surface of the circuit assembly for analysis, repair, and or adjustment.

Abstract: A system includes a first module to store times and temperatures for phases in a profile to rework a populated printed circuit board (PCB) for a first integrated circuit (IC) on the PCB and a second module to store suggestions for modifying one or more of the times and the temperatures in the profile to generate a revised profile, the suggestions being associated with pass/fail indications determined from actual temperature information for the profile.

Abstract: A method for repairing a steel alloy article, and an article repaired thereby, is provided and comprises the steps of depositing at least a first weld repair layer on a surface of the article so as to form a heat affected zone in the article beneath the surface. Locally heat treating the first weld repair layer and at least a portion of the heat affected zone adjacent the first weld repair layer at a temperature above the critical A1 temperature of the steel alloy article. Depositing at least one additional weld repair layer on the first weld repair layer without forming additional heat affected zone in the surface of the article. The first weld repair layer and the at least one additional weld repair layer are comprised of a material chosen from the group consisting of nickel chromium—iron alloys, cobalt base alloys, ERNiCr-3, ENiCrFe-3, ERNiCrMo-3, ERNiFeCr-2, ERCoCr-A, ERCoCr-E, CrMo alloys and CrMoV alloys.

Abstract: A method of locally repairing an aluminide coating (50) on a gas turbine engine nozzle guide vane (26) or a turbine blade (30,30B) comprises removing a damaged portion of the aluminide coating (50) from a portion (53) of the surface of the article. Any oxidised layer (54) is removed from the portion (53) of the surface of the article. Stoichiometric amounts of nickel and aluminium are placed on the portion (53) of the surface of the article using at least one foil (57). The stoichiometric amounts of nickel and aluminium are heat treated to form an aluminide patch coating (50B) on the portion (53) of the surface of the article and to bond the aluminide patch coating (50B) to the portion (53) of the surface of the article and to the aluminide coating (50) surrounding the aluminide patch coating (50B). The advantage is that the aluminide coating (50) surrounding the aluminide patch coating (50B) is not over aluminised.

Abstract: Methods for repairing abradable seals of gas turbine engines include providing an abradable seal component of a gas turbine engine, the seal component having a structural substrate; providing a first preform to restore the structural substrate; and providing a second preform to form an abradable layer of the component. Preforms include a multilayer stack having a first layer and a second layer.

Abstract: Many known solder alloys according to prior art utilize silicon or boron as melting point reducers, which, however, form brittle phases that have an undesirable effect on the thermo-mechanical properties. The invention relates to a solder ally that comprises gallium and/or germanium, preferably forms the Y? phase and has improved mechanical properties.

Abstract: A method of weld repairing a superalloy material at ambient temperature without causing cracking of the base material. A superalloy material such as CM-247 LC, as is commonly used in gas turbine blade applications, is subjected to an overage pre-weld heat treatment in order to grow the volume percentage of gamma prime precipitate in the material to a level sufficient to permit ambient temperature welding without cracking. CM-247 LC material is heated in a vacuum furnace at a rate of about 0.5° C. per minute to an intermediate temperature of about 885° C. The material is then gas fan quenched to a temperature of about 52° C. to grow the gamma prime precipitate percentage to about 55%. A fusion repair weld may then be performed on the material at an ambient temperature using a filler material having a chemistry matching a chemistry of the base material.

Abstract: A method for repairing a gas turbine stationary flowpath shroud. The method comprises providing a superalloy gas turbine stationary flowpath shroud that has previously been in service. The method further comprises preparing a restoration coating for application to the flowpath surface of the shroud by the steps of providing a precursor mixture comprising a higher-melting-point alloy component, a lower-melting-point alloy component, and a fugitive binder. A perform is prepared from the components and pre-sintered into a mildly curved form. The partially densified perform is applied to the flowpath surface and thermally bonded to the flowpath surface, forming a restoration coating.

Abstract: A method of repairing a crack in a component comprising a base material, in particular in a gas turbine blade, a suspension, which comprises a carrier liquid and at least one solid in the form of nanoparticles of the same material as the base material, being applied to the location to be repaired. A heat treatment of the component is carried out, the solid in the form of nanoparticles being melted and a bond with the base material being formed. During the heat treatment, the component is exposed to a thermal shock, in which a maximum temperature which corresponds to the melting temperature of the nanoparticles is reached. The nano size of the particles in the suspension causes a lowering of the melting point of these particles to take place, so that the structure of the base material does not change even at the melting temperature of the nanoparticles.

Abstract: In one aspect, a repair method for repairing components comprising a base material with a directed microstructure is provided. The repair is performed in such a way that the repaired location correspondingly has a directed microstructure like the surrounding base material. A solder is applied in the region of a location to be repaired and is soldered to the component via heat exposure, a temperature gradient, i.e., for instance a temperature variation from a higher temperature to a lower temperature, is thereby produced in the region of the location to be repaired.

Abstract: A repair apparatus includes a heating head device configured to heat a soldering member, which is soldered to a circuit board. The heating head device includes a heating head and a contact member heated by the heating head. The contact member is formed of a material having a spring characteristic and a thermal conductivity higher than a thermal conductivity of the heating head. The contact member is configured to be brought into contact with a soldered surface of the soldering member with an elastic force so as to melt a solder joining the soldering member to the circuit board.

Abstract: A method is disclosed for performing rework soldering for removing an electronic component from a printed circuit board and re-soldering the electronic component to the printed circuit board. The method includes the steps of positioning a dual structure body including a heating member and a cooling member between a rework target and a non-rework target placed on the printed circuit board, the heating member and the cooling member being arranged facing each other with a slight space provided therebetween, the heating member being situated toward the rework target, the cooling member being situated toward the non-rework target; heating the heating member; and cooling the cooling member.

Abstract: A method of repairing a metal component includes affixing a metallic foam matrix to a portion of the component to be repaired, applying a braze alloy over the metallic foam matrix, and heating the component in a substantially oxygen-free atmosphere. Affixing the metallic foam matrix facilitates inducing a capillary action of the braze alloy.

Abstract: The invention relates to a method for repairing components that consist of superalloys, in particular for repairing components that consist of a superalloy with an aligned microstructure in such a way that the repaired site likewise has an aligned microstructure. The method comprises the following steps: a solder material is applied to the repair site; the repair site with the applied solder material is heated until the latter melts; and the melted solder material is left to solidify. The solder material is an alloy with the same alloy components as the component alloy. At least the fraction of one alloy component in the solder material composition is modified in relation to the fraction of that alloy component in the component alloy composition, in such a way that the melting temperature of the solder material is reduced in relation to the melting temperature of the component alloy.

Abstract: Intermetallic braze alloys and methods of repairing an engine component are provided. In an embodiment, by way of example only, an intermetallic braze material includes between about 10% to about 15% chromium, by weight, between about 1% to about 3% aluminum, by weight, between about 0.1% to about 0.5% zirconium, by weight, between about 18% to about 25% hafnium, by weight, and a balance of nickel. In another embodiment, by way of example only, an intermetallic braze material includes between about 10% to about 15% chromium, by weight, between about 1% to about 3% aluminum, by weight, between about 10% to about 13% zirconium, by weight, between about 0.3% to about 0.7% hafnium, by weight, and a balance of nickel.

Abstract: The invention relates to a method for repairing components that consist of a superalloy. The method comprises the following steps: a solder material is applied to the repair site; the repair site with the applied solder material is heated until the latter melts; and the melted solder material is left to solidify. A powder blend, whose average composition corresponds to the component alloy constitutes the solder material, the blend comprising at least one elementary powder of the component alloy as one powder type and/or a pre-alloy of the component alloy.

Abstract: A method of hole defect repair includes removing one or more defects at or near a desired hole in a part by removing a portion of the part proximate the desired hole in a series of chain link patterns, and welding a filler material to the part after removing the chain link pattern portion of the part.

Abstract: A method of repairing spline and seal teeth of a mated component is disclosed. The method includes a low energy input weld to deposit a repair material on the non-worn, non-pressure face of the splines while minimizing the HAZ grain size. The splined area of the component is then remachined to the original spline contour by removing original material from the worn, pressure face of the splines and excess repair material to produce a mated component with radially re-clocked splines that have original component material on the pressure face of the teeth.

Abstract: A method for joining metal parts of a turbine engine component, the method comprising positioning a nanoparticle foil between faying surfaces of the metal parts, and diffusion bonding the metal with the nanoparticle foil, where the nanoparticle foil has a film thickness of about 100 micrometers or less, and comprises an alloy having an average particle size of about 500 nanometers or less.

Abstract: A method for repairing a metallic hollow body including at least one damaged portion to be repaired in a wall enclosing at least one cavity of the hollow body, the wall being a metallic material, is provided. The method includes the steps of filling a settable filling compound into at least one partial area of the at least one cavity; setting the filling compound; removing a predefined partial surface of the wall in an area of the at least one damaged portion; sealing the wall in an area of the removed partial surface by producing a covering element by welding, soldering, or casting-on; and removing the filling compound.

Abstract: A welding method forms a molten build-up portion on a base material that is any one of a single crystal material and a unidirectionally solidified crystal material. The method includes forming a plurality of build-up portions on the base material while maintaining a predetermined gap between adjacent build-up portions; and forming a build-up portion in each of the predetermined gaps.

Abstract: Methods are provided for repairing an engine component. In an embodiment, a method includes forming at least one layer of a first braze alloy mixture including about 40% by weight of a first base alloy material and about 60% by weight of a first braze alloy material, over a structural feature of the component. The first braze alloy material includes chromium, cobalt, tungsten, tantalum, aluminum, hafnium, carbon, boron, and a balance of nickel. A second braze alloy mixture is disposed over the at least one layer of the first braze alloy mixture, the second braze alloy mixture including between about 50% and about 60% by weight of a second base alloy material, and between about 40% and about 50% by weight of a second braze alloy material. The component is then subjected to heat treatment, and may be further subjected to machining, coating and final inspection.