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871 results about "Diffusion welding" patented technology
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Diffusion welding is a solid state welding process by which two metals can be bonded together. Diffusion involves the migration of atoms across the joint, due to concentration gradients. The two materials are pressed together at an elevated temperature usually between 50 and 70% of the melting point. The pressure is used to relieve the void that may occur due to the different surface topographies. The method was invented by the Soviet scientist N.F. Kazakov in 1953. Specific tooling is made for each welding application to mate the welder to the workpieces.
Process of making fine and ultra fine metallic fibers
A process is disclosed for making fine metallic fibers comprising forming a continuous tube about a plurality of coated metallic wires for providing a first cladding. The first cladding is drawn for reducing the outer diameter and for diffusion welding the coating within the cladding. The tube is mechanically removed to provide a first remainder. The first remainder is drawn for reducing the diameter thereof to transform the plurality of metallic wires into a plurality of fine metallic fibers. In one example, the diffusion welded coating is removed for providing the plurality of fine metallic fibers. In another example, a plurality of the first remainders are assembled and a continuous tube is formed about a the first remainders for providing a second cladding. The second cladding is drawn for reducing the outer diameter. The tube is mechanically removed to provide a second remainder. The second remainder is drawn for reducing the diameter thereof to transform the plurality of fine metallic fibers into a plurality of ultra fine metallic fibers. The diffusion welded coating is removed for providing the plurality of ultra fine metallic fibers.
Owner:PALL CORP
Diffusion welding method of titanium or titanium alloy and stainless steel
InactiveCN102218592AMeet service performance requirementsHigh-strength connectionNon-electric welding apparatusTitaniumHigh intensity
The invention discloses a diffusion welding method of titanium or titanium alloy and stainless steel. A plate pack having the same material quality with welded workpieces is welded into a block structure in advance. The plate pack is lengthways cut into slices along the block structure to form a structural middle layer 7. The middle layer is processed and then vertically arranged between the welded workpieces for diffusion welding. Because the middle layer having the same material quality with the workpiece is adopted, a joint heterogeneous interface combination mode is changed into a combination mode that half heterogeneous workpieces are directly combined and half heterogeneous workpieces are combined, and the titanium or titanium alloy and stainless steel workpieces are in high-intensity connection. In the diffusion welding method, the tensile strength of the joint is improved to above 80% from 50-70%(week side workpiece intensity) obtained by the direct diffusion welding technology, and various types of titanium or titanium alloy and stainless steel can be in high-intensity connection.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Welding method of aluminum target blank and aluminum alloy backboard
InactiveCN101564793ARealize large area weldingPrevent oxidationVacuum evaporation coatingSputtering coatingMetalBonding strength
A welding method of aluminum blank and aluminum alloy backboard comprises the following steps: providing an aluminum target blank and an aluminum alloy backboard; placing the aluminum target blank and the aluminum alloy backboard into a vacuum sheath and transferring into a welding device; adopting a hot isostatic pressing technique for diffusion welding, welding the aluminum target material blank to the aluminum alloy backboard for forming a target material assembly; and after the welding, executing air cooling and detaching the vacuum sheath and taking the target material assembly out. The invention adopts the vacuum sheath for realizing the isolation of target material from the backboard and the air. The oxidization on the surface of the metal in welding is effectively prevented and the cost of vacuum device is reduced. On the other hand, the hot isostatic pressing technique is used for the diffusion welding. The bonding strength between the aluminum target blank and the aluminum alloy backboard is effectively increased, and furthermore the bending deformation after bonding is little.
Owner:KONFOONG MATERIALS INTERNATIONAL CO LTD
Miniature micro-channel plate-fin heat exchanger
ActiveCN102494547ALaminated elementsStationary plate conduit assembliesMiniaturizationMolecular level
The invention relates to a miniature heat exchanger with a plate-fin micro-channel structure, wherein the miniature heat exchanger can act as a novel sensible heat exchanger or a phase change heat exchanger which is compact in structure, small in volume, high in heat exchange efficiency and high in heat exchange density. According to the embodiment of the invention, the heat exchanger is composed of a plurality of layers of metal thin sheets; one surface of each layer of thin sheet is provided with a micro-channel structure through an etching method, and the other surface of each layer of thin sheet is of a plane structure; and the plane side of one metal thin sheet and the micro-channel side of another metal thin sheet are overlapped and pressed together, thus the plate-fin micro-channel structure is formed. According to the heat exchange quantity requirement, multiple layers of thin sheets are laminated, and molecular-level combination among metal layers can be formed through a vacuum diffusion welding method, thus all the thin sheets are connected into a whole, and a complete heat exchanger is formed. According to the invention, the miniaturization difficulties of the heat exchanger and a refrigerator device can be solved.
Owner:BEIHANG UNIV
Magnesium alloy and aluminum alloy interlayer diffusion welding method
InactiveCN102248278AClosely connectedImprove parallelismVacuum evaporation coatingSputtering coatingCu elementMaterials science
The invention relates to a magnesium alloy and aluminum alloy interlayer diffusion welding method. The method mainly comprises the following steps of: (1) machining a welding metal base, namely processing, abrading, polishing and ultrasonically washing magnesium alloy and aluminum alloy; (2) depositing Cu films on the magnesium alloy and the aluminum alloy by controlling process parameters by using magnetron sputtering coating equipment; and (3) assembling the coated metal base by using a die, placing the die into a vacuum hot-pressing furnace, and controlling welding temperature, heat-preserving time and pressure to obtain a welding joint. The method has the advantages that: (1) the Cu film can protect the surface of the welding metal base better and reduce generation of inert metal oxide layers; (2) the Cu element improves phase constitution and the microstructure of a welding interface and inhibits generation of brittle intermetallic compounds in the midlayer of the welding joint; and (3) the welding joint has high strength, the tensile strength can reach 10 to 20 MPa, small deformation occurs in the welding joint, and the residual stress is small.
Owner:WUHAN UNIV OF TECH
Soldering/diffusion welding hybrid welding method for cemented carbide and alloy steel
InactiveCN102922154AHigh bonding strengthGood mechanical propertiesSoldering apparatusWelding/soldering/cutting articlesAcid washingBond strength
The invention provides a soldering / diffusion welding hybrid welding method for a cemented carbide and alloy steel. The method comprises the following steps of: performing the procedures of grinding, alkali washing and acid washing on the YG8 cemented carbide and the 42CrMo alloy steel sequentially, and then, electroplating a nickel coating on the surface of the YG8 cemented carbide; lapping the YG8 cemented carbide and the 42CrMo alloy steel, and paving a copper-based solder foil strip in a lapping area, thus obtaining a whole workpiece; and performing soldering / diffusion welding hybrid welding on the whole workpiece in a vacuum soldering furnace, thus obtaining a soldering / diffusion welding hybrid welding joint of the YG8 cemented carbide and the 42CrMo alloy steel. The welding joint subjected to the soldering / diffusion welding hybrid welding is high in bonding strength and small in residual stress, has a smooth and dense surface, and is smooth and attractive; and moreover, during the welding process, the welded workpiece is not easily oxidized and is subjected to small deformation, the service life of the workpiece is obviously prolonged, and thus the method is an ideal welding technology for realizing dissimilar welding of cutting teeth and cutting tools.
Owner:XIAN UNIV OF SCI & TECH
Heterogeneous metal connecting method for tungsten, copper and alloy thereof
The invention discloses a heterogeneous metal connecting method for tungsten, copper and alloy thereof, which comprises the following steps: firstly, processing the surface of tungsten metal and performing surface treatment; plating nickel to the tungsten metal, processing the surface of the tungsten metal, and cleaning the tungsten metal; then, processing and cleaning the copper alloy; and finally, overlapping and assembling the tungsten and the copper alloy to form weldment, and connecting the weldments in a vacuum chamber through pressure diffusion welding to form a connecting piece. The method has the remarkable characteristics that before vacuum diffusion welding connection for the tungsten and the copper, a layer of thin nickel is firstly electroplated on the surface of the tungsten metal, and then is subjected to vacuum diffusion welding with the copper alloy so as to implement diffusion connection of tungsten-copper heterogeneous metals. The method has the advantages of simple and convenient process operation, low cost and good connecting effect, and develops a new path for the connection of the tungsten-copper heterogeneous metals; and the shearing strength can reach 50 to 80 percent of a tungsten base material.
Owner:XI AN JIAOTONG UNIV
Diffusion welding method for tungsten-titanium alloy target and copper alloy back plate
ActiveCN102554455APrevent oxidationLow costNon-electric welding apparatusThermal deformationTitanium alloy
Disclosed is a diffusion welding method for a tungsten-titanium alloy target and a copper alloy back plate. An aluminum diffusion auxiliary layer is arranged between the tungsten-titanium alloy target and the copper alloy back plate, diffusion welding of the tungsten-titanium alloy target, the aluminum diffusion auxiliary layer and the copper alloy back plate is realized by the aid of high-strength atomic diffusivity between the tungsten-titanium alloy target and the aluminum diffusion auxiliary layer and between the aluminum diffusion auxiliary layer and the copper alloy back plate, and finally, welding quality of the tungsten-titanium alloy target and the copper alloy back plate is improved. Diffusion welding of the tungsten-titanium alloy target and the copper alloy back plate is implemented by a hot isostatic pressing process. As diffusion welding is performed in a vacuum sheath and air is isolated, the contact surface of welded metal can be effectively prevented from being oxidized, the bonding strength of the tungsten-titanium alloy target, the aluminum diffusion auxiliary layer and the copper alloy back plate is enhanced, the target is prevented from being separated from the back plate during sputtering, and sputtering coating is normally performed. A target assembly formed by the diffusion welding method has the advantages of high bonding compactness, high thermal deformation resistance and the like.
Owner:KONFOONG MATERIALS INTERNATIONAL CO LTD
Vacuum hot rolling compounding method of titanium alloy plate and stainless steel plate
InactiveCN101288877AAvoid the problem of severe embrittlementReduce the degree of diffusionTemperature control deviceWork treatment devicesLiquid metalCopper foil
The invention provides a vacuum hot-rolled composite method of a titanium alloy plate and a stainless steel plate, which relates to a composite method for the titanium alloy plate and the stainless steel plate. Aiming at the problems that intense mixing of liquid metal and high welding stress are generated during the melt welding of the titanium alloy plate and the stainless steel plate, the contradiction between the diffusion and the controlling of volume fraction of compounds in connection interface metals is boosted to ensure the connection during the vacuum diffusion welding and the explosion weld joint is difficult to be applied to high-temperature and corrosive temperature, the method is characterized in that the stainless steel plate (1) and the titanium alloy plate (2) are used; furthermore, a copper foil or aluminium foil (3) is used; the surfaces of the two plates are milled flatly and the copper foil or the aluminium foil (3) is laminated and fix between the two plates, so as form a specimen; the specimen is arranged in a vacuum loading chamber (5); when the vacuum degree in a vacuum heating furnace (6) is (1-3)*10<-3> Pa and the temperature is 600-1100 DEG C, the specimen is delivered into the vacuum heating furnace for heating and heat preservation, and then welded by a roller (7) and cooled. The method of the invention has small welding stress, can control the volume fraction of compounds in the metals with high hardness and large brittleness; furthermore, the weld joint can be applied to the high-temperature and corrosive environment.
Owner:HARBIN INST OF TECH
Low-temperature diffusion welding method for magnesium alloy and aluminum alloy
InactiveCN101920393AAvoid generatingHigh bonding strengthNon-electric welding apparatusSolder maskAxial pressure
The invention discloses a low-temperature diffusion welding method for magnesium alloy and aluminum alloy. The method comprises the following steps of: (1) workpiece surface cleaning: processing a magnesium alloy plate and an aluminum alloy plate to a specified size, and removing oxide layers from to-be-welded surfaces thereof; (2) workpiece assembly: placing a tin-zinc alloy foil serving as a middle layer between the aluminum alloy plate and the magnesium alloy plate, and placing a solder mask on and below the plates respectively to form a welded workpiece; and (3) charging the workpiece into a furnace and welding: putting the welded workpiece into a vacuum diffusion welding furnace, performing heating and heat preservation, applying an axial pressure to the welded workpiece when the heat preservation begins, and releasing the pressure when the heat preservation is finished. The method can effectively overcome the defect that the prior art cannot realize high-quality welding between the Mg alloy and the Al alloy, is suitable for reliable welding between the Mg alloy and the Al alloy of different categories, is particularly suitable for welding the thin magnesium alloy plate and the thin aluminum alloy plate, and has good welding planarity, high parallel precision and integral compactness.
Owner:WUHAN UNIV OF TECH
Copper-tungsten/copper-alloy integrated contact and preparation method thereof
The invention relates to a contact material for high-voltage switches and discloses a copper-tungsten / copper-alloy integrated contact and a preparation method thereof. The copper-tungsten / copper-alloy integrated contact comprises a contact part and a conducting rod part, wherein the tungsten content of the contact part gradually decreases from head to tail. The preparation method comprises the following steps: firstly, mechanically mixing powder by a wet method to prepare copper-tungsten particles with different tungsten contents; secondly, putting the tungsten in the die cavity of a compression mold according to the weight contents of tungsten in a descending order to carry out the press forming; thirdly, putting the pressed blank in a graphite boat, and sintering and infiltrating the pressed blank in a sintering furnace in the hydrogen atmosphere to obtain the copper-tungsten alloy of the contact part; and finally, sintering the low-tungsten-content end of the copper-tungsten alloy and the copper conducting rod part or the copper alloy conducting rod part to form an integral body by using a sintering method, an electro-beam welding method or a diffusion welding method, thereby obtaining the copper-tungsten / copper-alloy integrated contact.
Owner:XIAN FULAI ELECTRICAL ALLOY
Manufacturing process suitable for tungsten and steel connection of first wall part of fusion reactor
InactiveCN105499816AHigh densityImprove connection strengthArc welding apparatusElectron beam welding apparatusThermal expansionUltimate tensile strength
The invention discloses a manufacturing process suitable for tungsten and steel connection of first wall part of a fusion reactor, belonging to the welding field of metal diffusion welding. The process comprises the following steps: 1, processing tungsten, steel and interlayer material workpieces according to requirements, and finishing a to-be-welded surface; 2, after processing, decontaminating and cleaning the workpieces by ultrasonic waves, and carrying out vacuum sealing; 3, manufacturing a stainless steel sheath; 4. putting the workpieces into the sheath in sequence, and sealing the sheath by electron beam welding or argon arc welding; 5, welding the sealed workpieces and sheath in a hot isostatic pressure machine, adopting high-purify argon gas by pressurizing gas, maintaining the temperature for 1.5-6h in the welding environment at 600-1080 DEG C and under the pressure of 100-300MPa, carrying out furnace cooling, and discharging from the furnace when the temperature is lower than 150 DEG C; and 6, carrying out necessary hot processing. According to the manufacturing process, the problem of poor connection performance of tungsten and steel caused by large difference of coefficients of thermal expansion can be solved, the connection strength and reliability of tungsten and steel can be improved.
Owner:INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
Transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel
InactiveCN103252572ALow melting pointImprove interfacial wettabilityNon-electric welding apparatusUltimate tensile strengthVacuum chamber
The invention discloses a transient liquid phase diffusion bonding process of molybdenum copper alloy and stainless steel. The transient liquid phase diffusion bonding process comprises the following steps that (1) before welding, the surfaces to be welded of the molybdenum copper alloy and the stainless steel are cleaned, wiped and blown to be dry until the surfaces to be welded show metallic luster; (2) a composite middle layer is added between contacting surfaces to be welded of the molybdenum copper alloy and the stainless steel, and then a workpiece to be welded is put in a vacuum chamber and is pressed tightly through an upper pressing head and a lower pressing head; (3) when the vacuum chamber is vacuumized until the vacuum degree reaches 10-4 Pa, transient liquid phase diffusion welding is carried out on the assembled workpiece made of the molybdenum copper alloy and the stainless steel; (4) cooling is carried out after welding, and the welding workpiece made of the molybdenum copper alloy and the stainless steel is taken out. The transient liquid phase diffusion bonding process of the molybdenum copper alloy and the stainless steel completely achieves diffusion bonding between the molybdenum copper alloy and the stainless steel, can obtain a diffusion bonding connector made of the molybdenum copper alloy and the stainless steel with the shearing strength reaching 120 M Pa, can meet the use requirements of a composite structure made of the molybdenum copper alloy and the stainless steel, and has the advantages of being low in cost, simple, convenient, high in applicability, convenient to popularize and apply and the like.
Owner:SHANDONG UNIV
Welding method of copper target blank and copper alloy backing plate
ActiveCN101579782ARealize large area weldingPrevent oxidationNon-electric welding apparatusUltimate tensile strengthMetal
The invention relates to a welding method of a target and a backing plate, comprising the following steps of: providing a copper target blank and a copper alloy backing plate; putting the copper target blank and the copper alloy backing plate in a vacuum can and then conveying to welding equipment; adopting hot isostatic pressing process to conduct diffusion welding, and welding the copper target blank on the copper alloy backing plate to form a target module; and after welding, conducting air cooling, removing the vacuum can and taking out the target module. On one hand, the welding method adopts the vacuum can to separate the target and the backing plate from air, thus effectively preventing the metal surface from being oxidized when in welding and reducing the vacuum equipment cost; on the other hand, the welding method utilizes the hot isostatic pressing process to conduct diffusion welding, thus further improving the bonding strength between the copper target blank and the copper alloy backing plate and leading to small bending deformation after bonding.
Owner:KONFOONG MATERIALS INTERNATIONAL CO LTD
TiNi shape memory alloy and stainless steel instant liquid-phase diffusion welding connection method
InactiveCN101362253ALess loss of shape memory propertiesSmall organizationWelding/soldering/cutting articlesNon-electric welding apparatusHeat-affected zoneSurface cleaning
The invention relates to a method for transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel, which belongs to the technical field of the connection of dissimilar materials. In the prior art, the technology of the connection between TiNi shape memory alloy and stainless steel has the problems of welding crack, large crystal grains in the heat affected zone and poor mechanical properties. The transient liquid phase diffusion bonding between TiNi shape memory alloy and stainless steel is realized through the following steps: after the surfaces of TiNi shape memory alloy and stainless steel to be welded and the surface of AgCuTi foil is cleaned and dried, a TiNi shape memory alloy / AgCuTi metallic foil / stainless steel structure is formed, fixed through a welding clip, and then positioned in a vacuum diffusion oven, and welding pressure and temperature are applied to the structure. The method has the advantages that the welding temperature is low (relative to fusion welding), the influence to the base material is small, the connector has no welding defect, the shearing strength of the connector in the room temperature reaches 250 MPa, and the microhardness of the area near the seam section can reach 670 Hv.
Owner:BEIJING UNIV OF TECH
Diffusion welding method of dissimilar metal
ActiveCN106808078AGuarantee welding qualityGuaranteed coaxialityWelding/soldering/cutting articlesNon-electric welding apparatusAxial pressureConcentration gradient
The invention relates to a diffusion welding method of dissimilar metal. A specially designed outer side limiting tool and an inner support tool are adopted for thermal expansion constraint in the welding process of an assembled to-be-welded dissimilar metal part, thus, sufficient and even welding pressure on the radial welding face is obtained, and reliable welding guarantee is provided for diffusion welding of the dissimilar metal. The expansion constraint pressurizing idea is provided by the invention for dissimilar metal interface radial pressurizing, radial expansion of the to-be-welded part is constrained through an inner side limiting tool and the outer side limiting tool, and axial expansion of the to-be-welded part is constrained through axial pressure applied by a diffusion welding device or tool, so that expansion pressure is effectively applied to the welding interface of the dissimilar metal, and the dissimilar metal weld part with good joint performance and airtightness is obtained; and the seaming condition of the whole welding interface is good, obvious concentration gradient of the welding interface exists, and the diffusion characteristic is met.
Owner:CAPITAL AEROSPACE MACHINERY +1
Method of producing fiber-reinforced metallic building components
A method of producing fiber-reinforced metallic building components having a complicated three-dimensional geometric shape includes the following steps. First, metal-coated SiC fibers are applied to a metallic sectional piece having a simple geometric shape, and are then held thereon without restraint by a metallic counterpart piece. Then, the unit consisting of the sectional piece, fibers and counterpart piece undergoes plastic deformation in vacuo between mold halves by applying pressure at an elevated temperature, without bonding of the fibers to one another or to the building component metal. By further increasing the pressure and / or temperature, the molded unit is compressed further between the mold halves and is consolidated to a monolithic part by metallic bonding (diffusion welding), whereby the part, either alone or bonded to other parts, forms the building component, after cooling and removing it from the mold halves.
Owner:MOTOREN UND TURBINEN UNION MUNCHEN GMBH +1
End socket structure of copper and steel bimetallic pipe and seal welding method thereof
InactiveCN102155592ASimple processLow costNon-disconnectible pipe-jointsNon-electric welding apparatusThermal insulationShielding gas
The invention discloses an end socket structure of a copper and steel bimetallic pipe and a seal welding method thereof; and the end socket structure comprises a copper pipe and a steel pipe which are connected at the combining place of end sockets by a diffusion welding combining layer. The seal welding method comprises the following steps of: cleanly washing surfaces of the copper pipe end socket and the steel pipe end socket to be combined, and gluing the combining surfaces in advance; pressing an expanding plug into an inner hole of the copper pipe end socket; putting the copper pipe end socket and the steel pipe end socket into a diffusion annealing furnace filled with protective gas for heating and thermal insulation so that atoms of the copper and the steel mutually diffuse under the combined action of interference deformation force and temperature, discharging and air cooling, and dropping out the expansion plug. As the invention does not use an expensive silver-bearing welding material and a complex welding technology and only uses simple plastic deformation and the expansion plug, compared with the prior art, the end socket structure and the seal welding method have simple process and low cost and realize reliable welding seal between the cooper and the steel, and no crack is generated in end seams.
Owner:DALIAN MARITIME UNIVERSITY
Tungsten copper connection method
InactiveCN101494322AEasy to operateLow costLine/current collector detailsConnection contact member materialWave shapeTungsten
The invention discloses a tungsten-copper connection method, which comprises the following steps of: processing the surface of tungsten metal into a wave-shaped groove which is processed by superficial treatment: processing and washing the surface of copper metal: and then smelting and covering the copper metal on the wave-shaped surface of tungsten in a vacuum under temperature of 1150 to 1200 DEG C; processing and washing the smelt and the covered surface as well as copper alloy: and stacking and assembling the copper alloy into a welding piece which is connected by pressure and diffusion welding under temperature of 850 to 900 DEG C. The method has the advantages that solder or an intermediate layer is not adopted; the operation of the technique is simple and convenient; the cost is low; the connection effect is good; and a novel means of access for connecting tungsten and copper dissimilar metal is opened up, therefore, the method is convenient for popularization and application.
Owner:XI AN JIAOTONG UNIV
Method of fabricating a hollow mechanical part by diffusion welding and superplastic forming
Owner:SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
Diffusion welding method of TiAl/Nb based alloy and Ni based high-temperature alloy
InactiveCN101352772AHigh tensile strengthIncreased shear strengthSoldering apparatusWelding/soldering/cutting articlesSuperalloyDiffusion welding
The invention discloses a dispersing welding method for a TiAl / Nb series alloy and a Ni-based high temperature alloy. First, a middle layer formed by overlapping a processed Nb foil with a Ni foil is arranged between the TiAl / Nb series alloy and the Ni-based high temperature alloy, the surfaces of which are processed; wherein, the Nb foil is contacted with the TiAl / Nb series alloy and the Ni foil is contacted with the Ni-based high temperature alloy to construct a welded workpiece; the welded workpiece is arranged between an upper squeeze head and a lower squeeze head in a vacuum dispersing welding boiler; a welding resistance layer is arranged between the upper squeeze head and the TiAl / Nb series alloy as well as between the lower squeeze head and the Ni-based high temperature alloy; the dispersing welding of the TiAl / Nb series alloy and the Ni-based high temperature alloy are finished in the vacuum dispersing welding boiler. Due to the dispersing welding method of adding a compound middle layer of Nb-Ni, no hard brittle phases are generated on a connection interface; the anti-tension intensity of a joint is improved from 183MPa art to 516-750MPa; the shearing intensity of the joint is improved from 359MPa to 372-528MPa.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Ti-Al intermetallic compound alloy transition liquid phase diffusion weld composite connection method
InactiveCN1730224AEvenly closeWelding/cutting media/materialsSoldering mediaRoom temperatureIntermetallic
Disclosed is a Ti-Al intermetallic compound alloy transition liquid phase diffusion welding composite connection method, by welding the Ti3Al alloy with the method, the room temperature strength and the high-temperature strength of the joint can reach over 80% of the mother metal's strength, equal plasticity with the mother metal can be obtained under room temperature, the joint can achieve uniform structure similar to the mother metal.
Owner:中国航天科技集团公司第一研究院第七〇三研究所
Diffusion welding method of copper target and aluminum alloy back plate and prepared copper target assembly
InactiveCN111304604AImprove uniformityEnhanced solder bondVacuum evaporation coatingSputtering coatingTitaniumDiffusion welding
Owner:KONFOONG MATERIALS INTERNATIONAL CO LTD
Manufacture technique for thermonuclear reactor flow-passage containing parts
InactiveCN101332557AImprove cleanlinessAvoid damageNon-electric welding apparatusAs elementHeat-affected zone
The invention discloses a production process applicable to runner-containing parts in a fusion reactor blanket. The production process includes the steps: first, a plate and a runner-containing rectangular tube are manufactured according to the design and undergo precision surface working, the roughness Ra is less than 6.3Mum; second, the runner-containing parts are cleaned and decontaminated and then heated in vacuum for degassing; third, the runner-containing parts are vacuumized in an electron beam welding machine and the periphery of the surface to be welded is hermetically welded; and then the runner-containing parts are put into a hot isostatic pressing furnace for forming by hot isostatic pressing diffusion welding; finally, bending forming, heat treatment and machining, and the like, are performed. By adopting the production process; the runner-containing parts manufactured by the production process have reliable and uniform comprehensive performance without the weak performance zones of the heat affected zone, and the like, resulting from the fusion welding process or the defects such as element segregation and air vent, and the like, existing in the similar casting parts, thereby, the production process is particularly applicable to the production of the runner-containing part with the fusion reactor blanket under the condition of intense neutron radiation.
Owner:INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
Active transition liquid phase diffusion welding technique of metal-matrix composite material
The invention discloses an activity transition liquid phase diffusion welding technique for a metallic matrix composite material (MMC), comprising: firstly, presetting an active interlayer provided with following alloy family composition characteristics among metallic matrix composite materials to be welded, the active interlayer contains both melting point depressant elements capable of reacting with the metal base and active elements reacting with ceramic intensify phase; the active elements are elements which can react with the ceramic intensity phase in the composite material rather than elements which can react with the metallic matrix or metallic matrix surface oxide film; secondly, pressurizing onto the welding surface; heating with a temperature lower than the melting point of the active interlayer to ensure obtaining liquid phase by using eutectic reaction; performing thermal insulation for certain time; and completing welding. The invented technique can improve humectation and coherence between composite material welding area 'intensify phase / metal' week boundaries. In addition, the invented technique can be used broadly in welding process between heterogeneous materials such as between ceramic / metal, ceramic / MMC, metal / hard metal, etc.
Owner:XI AN JIAOTONG UNIV
SPS diffusion welding method for molybdenum alloy and tungsten alloy
InactiveCN107175398AEfficient connectionFacilitated DiffusionWelding/soldering/cutting articlesNon-electric welding apparatusRoom temperatureUltimate tensile strength
The invention provides an SPS diffusion welding method for a molybdenum alloy and a tungsten alloy. According to the method, titanium foil is used as an intermediate transition layer, solid phase diffusion welding is conducted on the molybdenum alloy and the tungsten alloy through an SPS technology, and a connecting piece of the molybdenum alloy and the tungsten alloy is obtained. By means of the welding method, a molybdenum alloy and tungsten alloy welding piece with the high strength and the good forming is obtained while it can be guaranteed that recrystallization of a base material is avoided, and the joint room temperature shear strength can reach 296 MPa.
Owner:HEFEI UNIV OF TECH
Method diffusion welding titanium alloy and copper alloy using niobium central layer
InactiveCN101254572AImprove toughness and strengthHigh bonding strengthNon-electric welding apparatusNiobiumAxial pressure
The invention relates to a method for welding titanium alloy and copper alloy. A method for diffusion-welding titanium alloy and copper alloy by using niobium intermediate layer is characterized in that the method comprises the following steps: (1) selecting niobium foil or powder as the intermediate layer for connecting a titanium alloy sheet and a copper alloy sheet, and cleaning the surfaces to be welded of the titanium alloy sheet and the copper alloy sheet; (2) arranging the niobium intermediate layer between the titanium alloy sheet and the copper alloy sheet, putting the whole into a graphite mold, transferring the graphite mold into a vacuum welding furnace, and applying a pre-pressure of 0.5 to 2 MPa to compress the mold; and (3) vacuuming the vacuum welding furnace, heating when the vacuum degree is larger than 5*10<-3> Pa with a speed of 2 to 10 DEG C / min to 700 to 850 DEG C, keeping the temperature for 30 to 60 min, applying an axial pressure of 5 to 10 MPa before keeping the temperature, decreasing the temperature when reaching the temperature-keeping time, discharging the pressure and cooling. The method can achieve high-strength connection between titanium alloy and copper alloy, and is suitable for high-strength connection of various kinds of titanium and copper alloys.
Owner:WUHAN UNIV OF TECH
Pressurizing device and method for vacuum diffusion welding machine
InactiveCN1669718ALow soldering temperatureReduce welding soak timeNon-electric welding apparatusVibration controlEngineering
This invention disclose a pressure device for vacuum diffusion welding, with the purposes of solving problem of long time weld, too high temperature, which is characterized in adding a vibrating cylinder (1) to present device, precise pressure regulating valve, vibration controlling valve controlled by PLC and PLC matching with (1), wherein, vibrating cylinder (1) and pressure valve (2) share a pressure axis (3), other parts are all rigidly attached, vibrating cylinder (1) is attached to gas source circuit via precise regulating valve and vibration controlling valve and parallel to pressure circuit. The invention can lower welding temperature by 30-300Deg.C, reduce welding time by 20-50%, and improve efficiency of device by 1-3 times.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Self-nano-structure diffusion welding technique for titanium alloy and stainless steel surface
InactiveCN101244483AIncrease the diffusion coefficientImprove mechanical propertiesPolishing machinesNon-electric welding apparatusNano structuringTitanium alloy
The invention discloses a titanium alloy and stainless steel surface self-nanocrystallization diffusion welding craft; wherein, the same diameter titanium alloy and stainless steel rod are selected; the surface self-nanocrystallization of the end face of the welding terminal is processed; the constant temperature and constant pressure diffusion welding or the impact pressurizing diffusion welding are processed. The titanium alloy and stainless steel surface self-nanocrystallization diffusion welding craft has the advantages of raising the diffusion coefficient of the titanium alloy and stainless steel in the process of diffusion welding, shortening the welding time, raising the welding efficiency, reducing the thickness of intermetallic compounds layer, refining the joint crystalline grain, and raising the mechanical property of the diffusion welding joint of titanium alloy and stainless steel.
Owner:CHONGQING UNIV
Plate Heat Exchanger, Method for Its Production, and Its Use
InactiveUS20090151917A1Strong turbulenceEfficient heat transferHeat transfer modificationLaminated elementsPlate heat exchangerEngineering
The invention relates to a plate heat exchanger composed of a plurality of plates (1), preferably made from sintered ceramic material, in which fluid-flow guide channels (2) are formed as a system of channels in such a way that a substantially meandering profile of the fluid flow is obtained over the surface area of the respective plate, the side walls (3) of the guide channels (2) having a plurality of apertures (4), which lead to turbulence of the fluid flow.The invention also relates to a method for the production of such a plate heat exchanger, in particular by a diffusion welding process in which the plates are joined to form a seamless monolithic block.The plate heat exchanger according to the invention is suitable in particular for applications at high temperatures and / or with corrosive media, and also as reactors.
Owner:3M INNOVATIVE PROPERTIES CO
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