67 results about "Dissimilar metal" patented technology

This invention provides an engine valve and a method for manufacturing the same, which can suppress galvanic corrosion even when dissimilar metals are joined, and which exhibits excellent wear resistance and corrosion resistance, for use in engines that use CNG, LPG, or alcohol as fuel. [Solution] The engine valve 10 of the present invention is a joint member in which a shaft portion 14 made of martensitic heat-resistant steel SUH11 and a umbrella portion 12 made of austenitic heat-resistant steel SUH35 are joined. A nitride layer is formed only on the surface of the base material on the shaft portion 14 side from the joint portion 13 between the shaft portion 14 and the umbrella portion 12, leaving the surface of the base material exposed on the umbrella portion 12 side from the joint portion 13.

The application relates to the technical field of metal material processing, and discloses a layered sintering preparation method of a composite layer titanium pot, which comprises the following steps: laying, from bottom to top, stainless steel powder, aluminum powder, active transition layer composite powder and titanium powder in a forming die in sequence, and compacting to obtain a composite green body; placing the green body in a variable pressure sintering furnace, first heating and keeping a low vacuum state; continuously heating to a second set temperature, starting a vacuum pump to instantaneously reduce to a deep vacuum state to discharge gas phase by-products; when heating to a third set temperature, filling argon into the furnace to establish a micro-positive pressure state and constant temperature preservation, inhibiting metal element volatilization and promoting liquid phase filling densification, and finally, cooling at a predetermined rate and naturally cooling out of the furnace. Through a temperature and pressure time sequence coupling process, the application eliminates interface oxide films and hole defects, realizes high-strength metallurgical combination of dissimilar metal materials, and improves the interlayer shear strength, thermal conductivity and thermal shock fatigue life of the composite pot.

This invention provides a method and apparatus for interface control in steel-aluminum dissimilar metal additive manufacturing, relating to the field of additive manufacturing technology. The method mainly includes: acquiring current process parameters and performing additive manufacturing based on these parameters; acquiring interface temperature field data during the manufacturing process; determining temperature characteristic parameters based on the interface temperature field data; inputting the temperature characteristic parameters into a prediction model to obtain interface brittle phase characteristics; determining the interface bonding strength based on the interface brittle phase characteristics; responding to the interface bonding strength not meeting a preset threshold, calling a reverse adjustment model to determine the process parameter adjustment amount; and adjusting the additive manufacturing process parameters based on the process parameter adjustment amount. This invention enables proactive and precise control of the morphology and layer thickness of the interface brittle phase, thereby improving the interface bonding strength.

The application discloses a laser welding clamping mechanism for aluminum-steel dissimilar metal splicing and relates to the technical field of aluminum-steel dissimilar metal welding, which comprises a frame body, the frame body is connected with a clamping assembly, the clamping assembly comprises a translation piece installed on the frame body, the translation piece comprises two groups of first motors, coaxial fixing connection of output ends of the first motors with single screw rods, and the inside of the frame body is fixedly connected with two groups of guide rails respectively; two groups of clamping pieces are installed on the two groups of single screw rods respectively, the laser welding clamping mechanism for aluminum-steel dissimilar metal splicing is matched with the two groups of first motors, the single screw rods and the guide rails, the horizontal positions of the two groups of clamping pieces are adjusted respectively, the horizontal positions of the anti-escape block, the supporting plate, the third motor, the first bidirectional screw rod, the first bellows, the two groups of slide rods, the first slide rail and the four groups of clamping jaws are adjusted by the first air cylinder, the clamping jaws are extended along the guide grooves in the guide blocks, and the clamping length is adjusted to be matched with the plate.

The application discloses a titanium alloy and niobium alloy dissimilar metal laser welding method, and belongs to the technical field of dissimilar metal welding. The method comprises the following steps: treating the surfaces of titanium alloy and niobium alloy to be welded; assembling the treated titanium alloy and niobium alloy by adopting an asymmetric thinning lock bottom structure to form a closed lock bottom cavity; arranging a back protective gas path below the surface to be welded and arranging a front protective cover above the surface to be welded to form a double-face gas protection device; clamping the workpiece in a self-adaptive clamp and applying a pre-tightening force to position the workpiece; presetting a scanning path of a laser beam; adopting a continuous fiber laser to make the laser beam perform a welding operation along the preset scanning path to complete main welding and perform targeted remelting treatment along the surface of the weld; continuously inputting protective gas after welding to slowly cool to room temperature; and performing stress relief heat treatment on the welded joint. The application realizes high-quality laser welding of the titanium alloy and the niobium alloy, has high joint strength, excellent surface quality and no oxidation defects, and does not need a vacuum environment, and is flexible in process and controllable in cost.

The application discloses a vacuum electron beam welding method of a heterogeneous metal electromagnet blank, and the sleeve ring, the magnetic conducting ring, the magnetic shielding ring and the stop iron are assembled into an integrated whole through design of a welding mandrel and a welding clamp, three welding seams are designed, and welding of each component is completed by adopting different welding sequences; the scheme ensures that there are no defects such as cracks and incomplete fusion in the welding seam of the heterogeneous metal electromagnet blank, meets the requirements of a first-grade welding seam of a relevant standard, simultaneously improves the welding deformation of the electromagnet blank, and ensures that the coaxiality of the electromagnet blank after welding meets the subsequent machining requirements.

This method suppresses the reduction in strength of the cooling device when welding together different types of metal components. [Solution] A cooling device is formed by joining a cover 20 made of metal and a heat dissipation part 10 made of a different type of metal to the cover 20 when they are superimposed on each other and a laser beam 152 is irradiated onto the cover 20. The heat dissipation part 10 has a groove 14 recessed on the surface that contacts the cover 20 when it is superimposed on it, so as to be separated from the cover. The part of the cover 20 opposite to the groove 14 melts and enters the groove 14, melting and joining with the part of the heat dissipation part 10 surrounding the groove 14 to form a molten part 50. In the molten part 50, a single-type metal molten part 51 and a dissimilar metal molten part 52 are formed. The single-type metal molten part 51 is the part where the base material of the cover 20 is melted. The dissimilar metal molten part 52 is the part where the base material of the cover 20 and the base material of the heat dissipation part 10 are melted.

The utility model relates to wood -plastic mould technical field, especially a kind of wood-plastic mould frame structure with composite reinforcing rib, including machine table, the top surface fixed mounting of machine table has extrusion pipe, the output end of extrusion pipe is fixedly installed with mould main body by bolt, the axis of extrusion pipe and mould main body coincides.The utility model has the advantages that after accurate positioning by positioning pin and the positioning hole of mould main body, only need to disassemble connecting bolt to quickly separate and assemble frame and mould main body.The first reinforcing rib of stainless steel material provides superhigh strength support, the second reinforcing rib of aluminium alloy material is further lightened in weight by slot design, and the composite reinforcing rib system formed by the combination of the two makes the overall structure weight lightened while improving bending stiffness.This modular design not only facilitates the separate replacement and recycling of assembly frame, and its dissimilar metal composite structure more effectively suppresses resonance phenomenon, especially suitable for high-frequency vibration extrusion working condition.

This invention discloses an integrated continuous heat treatment equipment and method for diffusion welding and controlled quenching in dissimilar metal joining, relating to the field of metal component manufacturing technology. The equipment includes a multi-parameter composite sensing unit, a central intelligent control unit, a diffusion welding furnace, a rapid quenching furnace, and a vacuum / atmosphere-locked transition chamber connecting the diffusion welding furnace and the rapid quenching furnace; the vacuum / atmosphere-locked transition chamber is equipped with a workpiece intelligent transfer unit. This invention, by constructing a dual-furnace continuous processing system integrating diffusion welding and controlled quenching, and integrating intelligent closed-loop control, fundamentally solves common problems in dissimilar metal joining, such as process dispersion, incompatibility with the base material heat treatment regime, limited cooling rate, and reliance on manual experience.

This invention relates to a welding and forming method for titanium-steel dissimilar metal composite components, belonging to the field of dissimilar metal welding and forming. It solves the problems of easy defects in titanium alloy casting, low strength of titanium / steel welded joints, and lengthy process flow in existing technologies. The method includes: surface treatment of the alloy steel workpiece; preparation of a Ni-V alloy composite intermediate layer on the alloy steel surface; use of titanium alloy atomized powder; placing the alloy steel part in a steel cladding, filling it with titanium alloy powder, and sealing it; after vacuum degassing, performing integrated forming and welding using a three-stage hot isostatic pressing process: low-temperature pre-connection, high-temperature high-pressure densification, and cooling in-situ stress relief; finally, removing the cladding. This invention effectively suppresses the formation of the Fe-Ti brittle phase through the diffusion-blocking effect of the Ni-V intermediate layer and the synergistic control of the three-stage hot isostatic pressing, resulting in high interfacial strength. It is suitable for the preparation of various high-strength composite components of titanium alloys and alloy steels.

The application relates to the technical field of preparation of dissimilar metal composite plate strips, and proposes a device and a method for cooperatively preparing dissimilar metal plate strips through laser and pulse current, which comprises a laser-pulse current composite rolling mechanism, a rolling mill feeding mechanism, a laser, a pulse current applying mechanism and the like.Two dissimilar metal plate strips are transported to the laser-pulse current composite rolling mechanism through the rolling mill feeding mechanism, and the rolling mill feeding mechanism can adjust the transport angle of the two dissimilar metal plate strips, the plate tension and the misalignment degree of the two dissimilar metal plate strips according to actual needs through two tensioning devices.The composite effect of laser pulses and electric current makes the two different metal materials well combined at the micro level.The production of double-layer composite dissimilar metal plates with high precision and high efficiency is realized, and the application prospect is important.The composite metal plate strips which are lighter, stronger and more durable can be produced, and the demand for high-strength and high-performance materials can be met.

The application discloses a titanium-based interlayer for titanium-aluminum heteroalloy diffusion welding and a preparation method and application thereof, and belongs to the field of hetero-metal diffusion welding. The interlayer is composed of the following components in percentage by mass: 72.7% to 83.1% of Ti, 13.5% to 14.8% of Mo and 2.1% to 13.8% of Ta, and the sum of the percentage by mass of the above components is 100%. The application can improve the oxidation resistance of a diffusion welded joint, realize high-quality and high-performance diffusion welding of a TiAl / Ti2AlNb composite component, and meet the design index and the reliability requirement.

This invention provides a method for preventing overheating and expansion during welding of tube sheets and heat exchanger tubes, and a tube sheet heat exchanger, relating to the field of heat exchanger manufacturing technology. The method includes: planning a welding sequence based on multiple tube sheet joints to be welded on the tube sheet, ensuring that consecutive tube sheet joints are not spatially adjacent; welding is performed according to the welding sequence, while simultaneously using heat-conducting fixtures to contact the tube sheet joints and dissipate heat; after welding a predetermined number of tube sheet joints, the weld temperature is detected and compared with a preset temperature threshold: if the weld temperature is less than or equal to the preset temperature threshold, welding continues with the next set of tube sheet joints; if the weld temperature is greater than the preset temperature threshold, welding is paused and the weld is cooled until the weld temperature drops below or equal to the preset temperature threshold. Through a synergistic mechanism of path dispersion, active heat conduction, and closed-loop temperature control, the method overcomes the problems of weld overheating oxidation, microstructure deterioration, and poor process stability caused by differences in thermal conductivity between dissimilar metals and heat accumulation during batch welding.

The application belongs to the technical field of heterogeneous metal additive manufacturing, and particularly relates to a titanium-copper-steel heterogeneous metal material and a preparation method thereof. A special Cu-3Ni-3Cr-2V copper alloy component is designed, heterogeneous metal connection of titanium-Cu-3Ni-3Cr-2V-steel can be realized, and a composite metal material is obtained through a method of global preheating of a base material, a defocusing flat-bottomed molten pool and an interval scanning strategy. The metal material can be made into a large size, and has no obvious metallurgical defects and thermal cracks, and no large amount of brittle intermetallic compounds.

This invention discloses a polishing slurry for metal surface treatment and its preparation process, relating to the field of metal polishing agent technology. The polishing slurry raw material composition includes hexagonal flake α-alumina, nano-cerium oxide, hydroxyethylidene diphosphonic acid, potassium sodium tartrate, urea peroxide, boron nitride nanosheets, polyethylene glycol, sodium tetraborate, and deionized water. The preparation process includes two-dimensional lubricant pre-dispersion, composite abrasive slurry preparation, accelerator-oxidant mixed solution preparation, and mixing and filtration steps. This invention constructs a catalytic oxidation system using nano-cerium oxide and urea peroxide, uses hydroxyethylidene diphosphonic acid and potassium sodium tartrate as a complexing agent, and uses boron nitride nanosheets as an auxiliary lubricating component. Under weakly alkaline conditions, it achieves highly efficient polishing of titanium alloys, aluminum alloys, and dissimilar metal materials, exhibiting high removal rate, good surface smoothness, balanced removal rate of dissimilar metals, and excellent storage stability.

This invention discloses an impact fabrication method for interlayer particle-reinforced composite structures in metals, belonging to the field of composite material preparation and laser processing technology. The method includes: providing a metal matrix and a metal flyer; pre-forming a particle layer on the side of the metal flyer facing the metal matrix; coating an absorption layer and covering it with a constraint layer; irradiating the surface of the flyer with a short-pulse laser to induce high-voltage plasma driving the flyer to impact the matrix at high speed, causing the particle layer to be pressed into the matrix surface, while simultaneously achieving solid-state welding between the flyer and the matrix at the particle gaps to form a particle-reinforced composite layer; repeating the above steps layer by layer to obtain a multilayer particle-reinforced metal matrix composite structure. This invention introduces a particle-reinforcing phase at the metal interlayer interface, achieving uniform distribution and firm embedding of particles, avoiding harmful interfacial reactions, and can prepare multilayer gradient composite structures of the same and different metals. This method has a wide process window and broad material adaptability, applicable to aerospace, electronic packaging, wear-resistant components, and other fields.

The present application relates to the technical field of refrigeration system pipe assembly, and discloses a groove fitting type return air pipe assembly for refrigerator and freezer. The assembly comprises a return air pipe and a capillary tube, the outer wall of the return air pipe is provided with a groove, and the local pipe body of the capillary tube is embedded in the groove to form an arc surface fitting structure; the outer wall of the capillary tube is provided with an insulating anticorrosive coating, and the outer sides of the pipe sections of the two groups of pipes are covered with fastening coating layers. The present application changes the traditional pipe line contact into arc surface contact, effectively improves the heat exchange efficiency, and reduces the pipe material cost; the groove positioning and the fastening coating layer are combined to fix, the pipe fitting is firm, and the pipe is not easy to loosen and dislocate during processing and use; the insulating anticorrosive coating is used to isolate copper and aluminum dissimilar metals, block the electrochemical corrosion reaction, and effectively protect the aluminum return air pipe; the present application has simple and reasonable structure, saves the traditional aluminum foil bottoming protection process, is convenient for automatic batch production, and effectively improves the overall consistency and use reliability of the product.

The application discloses a cupronickel rust removal and passivation solution, a cleaning method and a shell-and-tube heat exchanger. The cupronickel rust removal and passivation solution is composed of 8-15% of inorganic acid, 0.1-0.5% of corrosion inhibitor and passivation agent (consisting of copper alloy corrosion inhibitor and black metal corrosion inhibitor) and the rest of B-grade water. After the cupronickel rust removal and passivation solution is circulated for 90-120 minutes, a uniform passivation film can be formed on the surface of BFe1011 or BFe3011 cupronickel, and the corrosion rate of the base material and the weld is less than 0.01 mm / a. The application also provides a corresponding pickling and passivation method, which comprises the steps of circulation treatment, displacement rinsing and drying and inspection. The problems of high corrosion rate, poor passivation film quality and lack of heterogeneous metal protection in the traditional pickling method are solved, and efficient and low-corrosion maintenance is realized.

The invention relates to a welding method for attaching a first part to a second part. The welding method comprises the steps: a) supplying or manufacturing (100) a first part made of a first material; b) supplying or manufacturing (102) a second part made of a metallic material different from the first material; c) drilling (104) the first part; d) inserting (106) a retaining pin into an opening through the first part; e) fitting (108) an insulating sleeve into the opening through the first part; f) electrically welding (110) the retaining pin to the second part to join the first part to the second part via the retaining pin; the first part is then electrically insulated from the retaining pin by the insulating sleeve. The method is applied to a motor vehicle structure. Figure to be published with the abbreviation: Figure 6

The application discloses a Ti2AlNb / GH536 dissimilar material interface melting welding method and belongs to the dissimilar alloy welding field. The application aims at solving the problems of the brittle phase and the stress concentration caused by the too large difference of the thermal expansion coefficients of the dissimilar metals during the welding process. The application adopts the gradient nanocrystalline intermediate layer Ni / Nb and the Ag and SPS technology to perform diffusion welding on the GH536 alloy and the Ti2AlNb alloy, utilizes the gradient intermediate layer to relieve the difference of the thermal expansion coefficients of the two base materials and reduces the generation of the brittle phase during the welding process. Since the joint stress is relieved, the mechanical properties of the joint are ensured to be close to the base material. In addition, the nanocrystalline can promote the element diffusion by increasing the grain boundary quantity, reduces the welding temperature, and thus realizes the reliable welding of the joint with low temperature, small deformation and high strength.

The application discloses a liquid heating device, comprising a stainless steel base plate (1), a first surface of the stainless steel base plate (1) is provided with a thick film resistance heating layer (4), and a second surface of the stainless steel base plate (1) is fixedly connected with an aluminum pipe (2). At least one section of the aluminum pipe (2) is flattened into a flat section, and the flat section is metallurgically combined with the second surface of the stainless steel base plate (1) through an Al-Si brazing layer (3). The microstructure of the brazing layer (3) sequentially comprises an Al-Si eutectic layer (thickness 80-200 microns, lambda 2=15-35 microns) and an Al-Fe-Si intermetallic compound transition layer (thickness 5-15 microns, main phase Al 13 Fe4+secondary phase Al3Fe, and Fe content is continuously gradient distributed from 2wt% on the aluminum pipe side to 80wt% on the stainless steel side). The application forms a metallurgical combined layer with high strength (shear strength >=60MPa), high airtightness (leakage rate <=1*10 ‑8 Pa·m 3 / s) and excellent thermal stability (>=1000 times of 10-95 DEG C cold-hot cycle without cracking) between the aluminum pipe and the stainless steel base plate in the liquid heating device by controlling the double-layer microstructure of the brazing layer, solves the technical problems of low connection strength and poor reliability of dissimilar metals, and can be mass produced (good product rate >=98%).

This invention discloses a method for welding metal pipelines. The metal pipelines to be welded include a main pipe and branch pipes. The main pipe has a joint on its side wall, which includes a flared section and a straight section. The thermal expansion coefficient of the branch pipe material is greater than that of the joint. The welding method includes: inserting the branch pipe into the straight section to form an assembly gap; heating the flared section, with heat conducted to the main pipe, resulting in a lower temperature at the bottom of the straight section; the solder melting and penetrating into the gap; under continuous heating, the large radial thermal expansion of the branch pipe causes the assembly gap to contract and compress the liquid solder, while the liquid solder at the bottom solidifies to prevent overflow into the main pipe; when heating stops and cooling occurs, the large radial contraction of the branch pipe causes the gap to widen, creating a suction effect, and the remaining liquid solder continues to penetrate into the gap until the entire structure solidifies. This invention utilizes the thermal expansion difference between dissimilar metals to convert thermal deformation into a driving force for deep and dense penetration of the solder, effectively preventing incomplete welds and pipeline blockage.

The application provides a kind of method and system for dissimilar metal molten pool flow visualization based on synchrotron radiation.The method comprises preparing dissimilar metal sample;Clamping dissimilar metal sample in sample clamping table, adjusting the X-ray incident direction of synchrotron imaging device to penetrate dissimilar metal sample;Irradiate dissimilar metal sample with laser;Transmitting imaging of mixed molten pool is carried out using synchrotron radiation source, and a sequence of transmission imaging is obtained;The transmission imaging sequence is analyzed to obtain the dynamic migration and flow pattern image information and data of the metal in the mixed molten pool.The method does not need to introduce tracer particles or bubbles, and does not change the intrinsic flow of the molten pool;The imaging contrast is high, the space-time resolution is high, the real and repeatable molten pool internal flow field information can be obtained, and it is suitable for the molten pool dynamics research and mechanism analysis in the process of laser welding and additive manufacturing, to provide reliable data support for molten pool flow model verification and process optimization.

According to one embodiment disclosed herein, an electronic device comprises: a housing; a display disposed on the housing; and a battery disposed in the housing. The housing may include: a first metal portion forming at least a portion of the exterior of the electronic device; a second metal portion disposed inward of the first metal portion and made of a different material than the first metal portion; a filler metal disposed between the first metal portion and the second metal portion and coupled to the first metal portion and the second metal portion; and a plurality of dendrites at least partially diffused into the second metal portion from the filler metal. Various other embodiments are also possible.

This invention belongs to the field of dissimilar metal welding and relates to a laser welding process for aluminum-copper dissimilar metals. The welding process includes: preparing a first microstructure on the upper surface of a copper plate in the area to be welded; preparing a second microstructure on the lower surface of the copper plate in the overlapping area; then stacking the copper plate onto an aluminum plate, with the second microstructure of the copper plate overlapping the aluminum plate; and performing laser brazing under a protective atmosphere, with the laser beam focused on the first microstructure of the copper plate and welded along a predetermined path. This process, through the pretreatment of differentiated microstructures on the upper and lower surfaces of the copper plate, simultaneously achieves high laser absorption, low heat input, controllable interface, and mechanical anchoring, overcoming the core challenges of high reflectivity, thick brittle phases, and low joint strength in copper-aluminum laser welding, resulting in a high-strength, highly stable, and low-defect copper-aluminum dissimilar metal joint.

This invention discloses an automatic laser welding device for dissimilar metal cathode steel rods in aluminum electrolysis cells, belonging to the technical field of welding equipment. It includes a welding base and a welding mechanism. A first welding zone and a second welding zone are formed on opposite sides of the top of the welding base. A first pusher plate is provided in the first welding zone, and a driving mechanism is provided on one side of the first pusher plate. The welding mechanism is located between the first and second welding zones and includes a vertical guide rail. The vertical guide rail is annular with its central opening facing both the first and second welding zones. A welding slider is provided on one side of the vertical guide rail and slides along it. An electric push rod is provided on one side of the welding slider. The electric push rod has a movable rod that moves towards the annular center of the vertical guide rail. The end of the movable rod is equipped with a welding gun and a ranging element. This automatic welding device can improve the welding efficiency and quality of dissimilar metals.

This invention discloses a dissimilar metal electromagnetic pulse welding method assisted by a high-entropy alloy interlayer, belonging to the field of dissimilar metal welding technology. The method involves setting the discharge voltage and discharge capacitor capacity of the electromagnetic pulse welding device, charging the pulse energy storage capacitor, triggering a high-voltage gap switch to discharge, and using a transient magnetic field generated by the electromagnetic coil to drive a first base material plate carrying the high-entropy alloy interlayer to impact a second base material plate at high speed. The interface undergoes high-strain-rate adiabatic shearing to form an in-situ amorphous or nanocrystalline gradient transition layer. This invention organically integrates the high-entropy alloy interlayer with electromagnetic pulse welding technology, effectively suppressing the formation of continuous brittle intermetallic compounds at the dissimilar metal welding interface and significantly improving the mechanical properties of the joint. Furthermore, it achieves quantitative screening of the high-entropy alloy interlayer composition through a three-dimensional orthogonal criterion, overcoming the blindness and low efficiency of traditional trial-and-error material selection methods.