1458results about "Soldering apparatus" patented technology

The invention discloses a preparation method of a vertical comb-driven MEMS (Micro Electro Mechanical System) micromirror, which comprises the following steps of: forming a through alignment mark and a pre-etched comb structure on a device layer by using a first composite mask, and forming the through alignment mark and the pre-etched comb structure on the back surface of the device layer on a first substrate through a composite mask process, after the first substrate and the second substrate are bonded, the self-alignment composite mask of the comb tooth structure is aligned with the back face pre-etched comb tooth structure through the through alignment mark, high-precision alignment of the comb tooth structure is achieved, accumulated errors are avoided, and the yield of device preparation is improved.

The invention discloses a niobium-zirconium alloy and nickel-based alloy vacuum brazing process and a part, and belongs to the technical field of vacuum brazing. According to the process, a vacuum brazing furnace is adopted for brazing, and BNi-2 brazing filler metal is used; the process comprises the following steps that S1, a welding assembly structure formed by a niobium-zirconium alloy part and a nickel-based alloy part is assembled, and BNi-2 brazing filler metal is arranged at the matching position of the welding assembly structure; s2, staged heating is carried out on the welding assembly structure under the preset vacuum degree of the vacuum brazing furnace, and the staged heating comprises a foreign matter removing heating stage, a brazing filler metal solid diffusion heating stage and a brazing filler metal melting wetting heating stage which are sequentially carried out; and S3, staged cooling is conducted on the welded assembly structure after welding is completed, the staged cooling comprises a furnace cooling stage and a gas quenching cooling stage which are conducted in sequence, according to the scheme, defect control over the niobium-zirconium alloy and nickel-based alloy welding joint can be effectively achieved, and the strength and sealing performance of the welding joint are guaranteed.

This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, that provide for welding techniques for manufacturing robots, such multipass welding techniques for welding robots. For example, the welding techniques may enable generation of weld instructions based on a welding fill plan. The instructions may be generated based on a bead model or a table that indicates a wire feed speed, a travel speed, or a voltage. As another example, the techniques may enable generation of weld instructions based on the one or more dimensions of a seam. As another example, the techniques may enable generation of a joint model of a cross-section of a seam to be welded. The joint model may be generated based on a combination of a plurality of feature components to generate the joint model of the seam. Other aspects and features are also claimed and described.

The invention discloses a composite aluminum plate with an embedded mixed melting layer microstructure and a cast-rolling preparation method of the composite aluminum plate, and belongs to the technical field of aluminum alloy material preparation, the composite aluminum plate comprises a coating aluminum alloy, a matrix aluminum alloy and an embedded brazing flux mixed melting layer, the coating aluminum alloy is connected with the matrix aluminum alloy through the embedded brazing flux mixed melting layer, and the matrix aluminum alloy is connected with the embedded brazing flux mixed melting layer. The pre-embedded brazing flux mixed melting layer is a controllable mixed metal layer formed by mixing pre-embedded brazing flux metal and a fusion layer formed by a solid-liquid cast rolling process, the cast rolling preparation method is a coating-cast rolling combined preparation method, and the method has the advantages of being short in process, high in production efficiency, high in pre-embedded layer control precision and the like, and large-scale production of products is facilitated.

The invention discloses a method for brazing and connecting diamond and copper through Ag-Cu eutectic brazing filler metal. The method comprises the following steps that S1, coating treatment is conducted on diamond, and surface metallized diamond is obtained after heating activation; s2, copper to be brazed and the surface metallized diamond are subjected to brazed connection through Ag-Cu eutectic brazing filler metal; wherein in the step S1, a titanium layer, a molybdenum layer and a nickel layer are sequentially deposited on the surface of the diamond, and coating treatment of the diamond is achieved. According to the method, the residual stress of the brazed joint can be reduced, the service life of the brazed joint is prolonged, the sealing performance of the brazed joint is improved, and important reference is provided for preparation of the large-size diamond microwave window.

The invention discloses a batch processing technology of micro-fluidic chips, and relates to the technical field of chip processing. The method comprises the following steps: firstly, providing at least two layers of polymer coiled materials, namely a first coiled material for forming a micro-channel structure and a second coiled material for closing a micro-channel, the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA), and the coiled materials are continuous coiled materials selected from polyethylene glycol terephthalate (PET), cycloolefin polymer (COP), polycarbonate (PC) or polymethyl methacrylate (PMMA); the thickness of the coiled material is 50-500 microns; secondly, carrying out continuous compression molding processing on the surface of the first coiled material through a roll-to-roll processing platform; through a roll-to-roll continuous process, micro-channel mold pressing, functional deposition, precise alignment bonding and online cutting are integrated, high-efficiency, high-consistency and high-integration-level batch manufacturing of the micro-fluidic chip is realized, and manual intervention and production cost are remarkably reduced.

The invention provides an MEMS pressure sensor and a manufacturing method thereof, and an electronic device, and the method comprises the steps: providing a first substrate, forming at least two first pressure structures on the surface of the first substrate, each first pressure structure comprises a first electrode layer, a first sacrificial layer, a first supporting layer, a second electrode layer, a second supporting layer, and a first cavity, and a first release hole; a second substrate is provided, at least two second pressure structures are formed on the surface of the second substrate, and each second pressure structure comprises a third electrode layer, a second sacrificial layer and a second cavity; bonding the second supporting layer with the second sacrificial layer; the second substrate is removed to expose the third electrode layer, the third electrode layer and the second electrode layer form a variable capacitance structure, the second electrode layer and the first electrode layer form a reference capacitance structure, and the two variable capacitance structures and the two reference capacitance structures jointly form a Wheatstone bridge. According to the scheme, the measurement precision is improved, and the device performance is further improved.

The invention provides an MEMS pressure sensor, a manufacturing method thereof and an electronic device, and the method comprises the steps: providing a first substrate and a second substrate, forming a first pressure structure on the first substrate, and forming a second pressure structure on the second substrate; bonding the first pressure structure and the second pressure structure; the first substrate is removed, the first pressure structure and the second pressure structure jointly form a third pressure structure, the third pressure structure comprises a first electrode layer, a second electrode layer, a third electrode layer, a fourth electrode layer and a fifth electrode layer which are arranged at intervals from top to bottom, and a dielectric layer is formed between every two adjacent electrode layers; and cavities penetrating through the dielectric layers are formed in the dielectric layers. According to the scheme, the multiple electrode layers arranged from bottom to top are formed, the multiple electrode layers form the first capacitor, the second capacitor, the third capacitor and the fourth capacitor respectively, then the Wheatstone bridge is formed jointly, the measurement precision of the MEMS pressure sensor is improved, meanwhile, the plane size of the MEMS pressure sensor is reduced, and the integration level of the device is improved.

A heat exchanger includes at least two plate bodies stacked with each other and at least one connecting sheet. Each of the at least two plate bodies is provided with a plurality of micro-passages. The at least one connecting sheet is arranged between adjacent plate bodies of the at least two plate bodies. A solder is disposed on each of two opposite sides of the at least one connecting sheet, and the solder is configured to weld and fix the at least one connecting sheet with the adjacent plate bodies of the at least two plate bodies.

The embodiment of the invention discloses a dynamic regulation and control system for lead-free brazing filler metal welding process parameters based on reinforcement learning. The dynamic regulation and control system comprises a data acquisition module, a data processing module and a control module. The data acquisition module is used for acquiring original welding data in real time; the data preprocessing module is used for performing space-time alignment on the original welding data to obtain a space-time consistency data set and performing feature compression on the space-time consistency data set to obtain a welding feature vector; the decision generation module is used for fusing the welding feature vectors into enhanced state vectors, and generating a parameter adjustment strategy for the enhanced state vectors through an Actor-Critic network architecture on the basis of a reinforcement learning algorithm; the decision control module is used for converting the parameter adjustment strategy into a welding equipment control instruction, implementing safety constraint on the welding equipment control instruction and outputting a safety verification control instruction; and the decision execution and optimization module is used for executing the security verification control instruction, optimizing network architecture parameters and generating an update adjustment strategy. The welding quality and the welding efficiency can be obviously improved.

A method for fabricating a MEMS device comprising the following steps: providing a first bonding surface (1) on a first substrate (2) with a first substrate doping; providing a second bonding surface (3) on a second substrate (4) with a second substrate doping; aligning and joining the first and second bonding surfaces (1, 3) by a Si-Si direct bonding process, wherein both bonding surfaces (1, 3) have a silicon surface, and wherein an additional near-surface first doping layer (5) is produced below at least one of the bonding surfaces (1).

The invention discloses a preparation method of a bidirectional auxetic honeycomb anti-explosion protection structure and a bending and welding integrated structure, and belongs to the technical field of metamaterial structure design. The structure comprises an upper panel and a lower panel, wherein a first bending plate, a second bending plate and a bending connecting plate are arranged between the upper panel and the lower panel; the first type of bending plates are symmetrically spliced and combined with the bending connecting plates to form concave hexagonal cell elements; the first bending plate and the second bending plate are spliced and combined to form a double-arrow cell element; the sandwich structure is formed by adopting concave hexagonal cell elements and double-arrow cell elements which are arranged at intervals in a crossed manner in the horizontal direction, and the adjacent double-arrow cell elements are symmetrical along the middle concave hexagonal cell element; and the second bending plates in the double-arrow cell elements are spliced with the concave parts of the first bending plates in the concave hexagonal cell elements. The structure combines two structural characteristics of the concave hexagonal honeycomb and the double-arrow honeycomb, has bidirectional negative Poisson's ratio performance and higher bidirectional bearing capacity, and has a higher capacity absorption effect when subjected to explosion impact.

The invention relates to the technical field of vacuum brazing, and discloses a vacuum brazing method for a needle array radiator, which comprises the following steps of: fusing reference process parameters of a historical process knowledge base and multi-dimensional characteristic parameters of the needle array radiator to obtain brazing process characteristic parameters; performing process strategy matching on the needle array radiator to confirm a vacuum brazing strategy of the needle array radiator; a vacuum brazing strategy is applied, and a vacuum brazing furnace is driven to execute stage process operation of preheating degassing, brazing filler metal melting and spreading, diffusion bonding and controllable cooling; performing situation analysis on the real-time process data flow of the stage process operation to obtain deviation data; dynamic parameter reconstruction is conducted on the target brazing stage of the needle array radiator, and temperature regulation and control parameters and process logic parameters are obtained; the needle array radiator is subjected to circulating brazing control, and a post-welding component of the needle array radiator is obtained; the efficiency of the vacuum brazing method for the needle array radiator can be improved.

The invention relates to the technical field of MEMS radiator processing, in particular to a processing method of an MEMS radiator, which comprises the following steps of: 1, manufacturing an air inlet grid opening, a gas advection bin body, a vibration upper opening binding ring, a piezoelectric vibrator, a flexible circuit board, a vibrator amplification layer, a gas beam dense hole layer and an impact platform according to the size; 2, the flexible circuit board and the piezoelectric vibrator form a circuit piezoelectric vibrator through reflow soldering; 3, the air inlet advection bin body, the vibration upper opening binding ring, the circuit piezoelectric vibrator, the vibrator amplification layer, the air beam dense hole layer and the impact platform are assembled from top to bottom. According to the machining method of the MEMS radiator, firstly, solder paste is printed on a flexible circuit board steel mesh to lead welding spots, the flexible circuit board steel mesh and the piezoelectric vibrator are placed into a clamp together to be fixed, and then the flexible circuit board steel mesh is welded to the piezoelectric vibrator; the circuit piezoelectric vibrator prepared by the method is reliable and durable, and welding spots are not easy to fall off, so that the piezoelectric vibrator can have better stability in high-frequency vibration.

The invention provides a preparation method of a micro-channel pipe structural member for a liquid cooling plate, and belongs to the technical field of liquid cooling plates. The invention discloses a preparation method of a micro-channel pipe structural member for a liquid cooling plate. The preparation method comprises the following steps: S1, preparing raw materials for forming the liquid cooling plate; s2, carrying out roll bending forming treatment on the upper wallboard raw material; s3, roll bending forming treatment is conducted on the lower wall plate raw material; s4, the micro-channel pipe raw material is subjected to roll bending forming treatment; s5, the upper wall plate structural part, the lower wall plate structural part and the micro-channel pipe structural part which are subjected to roll bending forming treatment are connected and fixed through brazing, and a final three-layer structural part is assembled; and S6, a cooling water nozzle is installed at the position of the micro-channel pipe structural part. According to the method, roll bending is conducted firstly, then welding is conducted, the method has the advantages of being efficient and rapid in forming, integrated forming can be achieved on complex profiles through the process, high-temperature diffusion bonding is avoided, and therefore the service life of the three-layer plate is greatly prolonged, and the mechanical property of formed components is greatly improved.

The utility model discloses an automatic bending and tin dipping device based on electromagnetic coil pins, which comprises a loading turntable structure provided with a controllable rotary turntable surface and a plurality of groups of electromagnetic coil stations; the loading and unloading carrying structure is arranged corresponding to the loading turntable structure; the pin bending structure is used for outputting stamping kinetic energy to bend electromagnetic coil pins; the soldering-aid dipping structure comprises a soldering-aid shifting and transposition assembly and a soldering flux lifting assembly, the soldering-aid shifting and transposition assembly is provided with a transposition kinetic energy output end, and the soldering flux lifting assembly is provided with a soldering flux lifting end; the pin tin immersion structure comprises a tin immersion transfer assembly and a tin melting liquid storage assembly. And the impedance detection structure comprises an upper and lower limit alarm resistance meter and a test probe, and can be arranged corresponding to the plurality of groups of electromagnetic coil stations in a switchable manner. The problems that in the prior art, bending and tin immersion processes of electromagnetic coil pins generally depend on manual operation, so that the overall automation degree, the operation efficiency and the qualified rate are low, and the labor cost is high are solved.

The invention relates to the technical field of industrial control, in particular to an SMT production process quality control method and system. The SMT production process quality control system comprises a soldering paste distribution condition real-time acquisition module, an electromagnetic coil array parameter adjustment module and a reinforcement learning module. The electromagnetic coil array is arranged around the reflow soldering furnace, the infrared thermal imaging technology is combined, the thermal image of the PCB is obtained in real time and sent into the soldering paste segmentation model to be processed, the flowing state of the soldering paste is accurately represented, the system can dynamically adjust the control parameters of the electromagnetic coil array based on the soldering paste distribution thermodynamic diagram, and the stability of the reflow soldering system is improved. Comprise current intensity, current frequency, waveform and the like, so that the electromagnetic field is accurately adjusted, the flowability of the solder paste is optimized, excessive or too little solder paste accumulation is avoided, and the risks of solder bridge and insufficient solder are reduced.

The invention belongs to the technical field of graphite metal composite heat dissipation devices, and provides a flexible graphene film heat conduction cable and a preparation method thereof.The preparation method comprises the steps that the surface of a graphene film is cleaned and punched, and the graphene film with micron-sized pores in the surface is obtained; sequentially plating a layer of active metal film and a layer of heat-conducting metal film on the surface of the graphene film, and cutting to obtain a graphene film; graphene films are overlaid layer by layer to obtain a laminated material, and the two ends of the laminated material are clamped to a hot-pressing mold to be subjected to hot-pressing welding treatment, so that a locally connected flexible heat conduction section is obtained; and the flexible heat conduction section and the heat conduction metal shell are assembled, a soldering lug is placed for brazing and finish machining, and the flexible graphene film heat conduction cable is obtained. According to the method, the internal connection problem of the flexible section is solved by establishing a synergistic process of surface punching, double-layer coating and hot pressing, the heterogeneous connection problem of the flexible section and the shell is solved in a manner of sampling coating and brazing, and through the synergistic effect of all links, the overall performance and reliability of the heat-conducting cable are remarkably improved.

The invention discloses a computer mainboard welding temperature correction control method based on machine learning, which relates to the technical field of intelligent control, and comprises the following steps: predicting a reference welding temperature curve by using a machine learning model based on historical operation data of reflow welding of a computer mainboard; dividing a thermal management area based on the thermal characteristics of the component; determining an optimal welding temperature curve; on the basis of the divided heat management areas, regionalization adjustment is conducted on the optimal welding temperature curve, and temperature area parameter fine adjustment strategies for the different heat management areas are generated; and based on the optimal welding temperature curve and the fine adjustment strategy, a final temperature control instruction set is synthesized, and the reflow soldering furnace is controlled for batch production. The method has the advantages that through fusion of machine learning and real-time data driving optimization, on the premise that the welding reliability is guaranteed, the production efficiency and energy consumption are intelligently balanced, and the adaptability and the intelligent level of a production line are remarkably improved.

A three-dimensional vapor chamber assembly structure includes a housing, heat pipes, a capillary member and a working fluid. The housing includes a first housing plate and a second housing plate, a cavity formed between the first and second housing plates, and through holes formed on the second housing plate. The heat pipe penetrates through the through holes and includes an open end having a flange formed thereon. The flange includes lateral and longitudinal surfaces. The lateral surface of the flange is attached to the second housing plate via a welding layer, and the longitudinal surface of the flange is attached to the second housing plate via a welding product. The capillary member is arranged inside the cavity and attached to the housing. The working fluid is arranged inside the cavity. Accordingly, a firm and robust vapor chamber structure capable of preventing welding material from entering the cavity is achieved.

The invention discloses a vacuum cup with a metal shell and an inner container directly compounded and a preparation method. The vacuum cup comprises a metal shell, an inorganic non-metal inner container and a transition layer located at openings of the metal shell and the inorganic non-metal inner container. The transition layer is at least one of a metal transition layer, a metal solder transition layer or a glass solder transition layer, the thermal expansion coefficient of the transition layer is between the thermal expansion coefficient of the metal shell and the thermal expansion coefficient of the inner container, and the thermal expansion coefficient meets the metal shell gt; a transition layer gt; an inorganic nonmetal liner; when the transition layer is a metal transition layer, the relative difference K between the transition layer and the thermal expansion coefficient of the metal shell is less than 60%; when the transition layer is a metal solder or glass solder transition layer, K is less than 20%; the total thickness of the transition layer is smaller than 1 mm. By reasonably controlling the material and thermal expansion coefficient of the transition layer, a middle structure with a deformation inhibition function is formed, thermal expansion deformation of the metal shell is relieved, the welding stress is reduced, the cracking risk is reduced, and reliable and direct compounding of the metal shell and the inorganic nonmetal inner container is achieved.

To provide a sealed ceramic component of excellent cost-performance and method of producing the same.SOLUTION: In a sealed ceramic component formed by bonding a ceramic component and a metal component with an active metal brazing material according to the embodiment of the present invention, a chamfered section formed between an end face and an outer peripheral face of the ceramic component and the metal component are bonded to each other with an active metal brazing material. A method of producing a sealed ceramic component formed by bonding a ceramic component and a metal component, comprises a step of preparing the ceramic component by forming a chamfered section on an outer side of an end face thereof, a printing step of printing / drying paste of an active metal brazing material on the chamfered section to obtain a printed component, and a bonding step of bonding the metal component placed on the printed component by applying a heat treatment thereto.SELECTED DRAWING: Figure 1

The invention relates to the technical field of dissimilar material connection, in particular to a method for regulating and controlling molybdenum steel brazed joint intermetallic compounds based on transition elements. According to the technical scheme, the method comprises the following steps that a transition element coating is deposited on the surface of a molybdenum matrix, transition elements are selected from one or more of Ti, V, Nb, Zr, Hf and Ta, and the molybdenum matrix and a steel matrix are brazed through boron-containing Ni-based brazing filler metal; in the brazing process, the transition element and the boron element preferentially react to generate a transition element boride, and therefore generation of MoNiBintermetallic compounds is inhibited. According to the method, the transition element coating is introduced, a brazing interface reaction path is actively intervened and reconstructed from the thermodynamic angle, and the problem of continuous generation of the brittle MoNiBintermetallic compound in the molybdenum / steel brazing joint is fundamentally solved.

The invention provides a lead bonding and packaging device and a lead bonding and packaging method for a key process for packaging a deep cavity lead of an immersion type miniature liquid pressure sensor. The lead bonding packaging equipment comprises a rack, a movement mechanism mounting plate, an X-axis movement mechanism, a Y-axis movement mechanism, a first Z-axis movement mechanism and a second Z-axis movement mechanism, the movement mechanism mounting plate, the X-axis movement mechanism, the Y-axis movement mechanism, the first Z-axis movement mechanism and the second Z-axis movement mechanism are all mounted on the rack, a clamping mechanism is mounted on the X-axis movement mechanism or the Y-axis movement mechanism, and a visual microscopic mechanism is mounted on the first Z-axis movement mechanism. And a chopper positioning mechanism is mounted on the second Z-axis movement mechanism. According to the technical scheme provided by the invention, the alignment accuracy and stability in the wire leading process can be ensured, the yield and consistency of deep cavity bonding are improved, manual intervention and operation errors are reduced, automation of the wire bonding process is realized, the bonding precision and stability are improved, and the method has relatively high practicability and popularization value.

The invention relates to the related technical field of welding control, in particular to a sensor pin welding control method and system.The sensor pin welding control method comprises the steps that according to a sensor pin, welding environment parameters are obtained, basic welding parameters are determined, a welding control parameter matrix is set in combination with a first welding execution instruction sequence and a second welding execution instruction sequence, and a welding path is dynamically corrected; and meanwhile, welding process restarting and welding spot forming quality compensation after basic welding parameter correction are carried out according to the dynamic back-off welding execution path. The technical problems that a preset fixed track is adopted in a welding path, sensor pin assembly errors cannot be effectively compensated, and pseudo soldering and false soldering risks exist are solved, basic welding parameters are determined, welding conditions are accurately matched with material characteristics and a real-time environment, the welding path is dynamically corrected in combination with a welding control parameter matrix, and the welding quality is improved. And after parameter correction, process restarting and welding spot forming quality compensation are carried out, and the technical effects of improving the welding yield and the product consistency are achieved.

The invention relates to the technical field of material sealing, in particular to a high-performance insulating ceramic sealing method for a neutron tube, which comprises the following steps: sequentially carrying out organic solvent ultrasonic cleaning and argon plasma etching activation treatment on a sealing surface of a cylindrical high-purity aluminum oxide ceramic piece, and depositing a titanium transition layer through magnetron sputtering, the ceramic piece with the titanium transition layer is obtained; the sealing face of the kovar alloy cylindrical flange plate is subjected to acid pickling, an oxide layer is removed, cleaning and drying are conducted, and a metal sealing part is obtained; preparing an active brazing filler metal sheet; the components are assembled in sequence to form a pre-assembled component; the pre-assembled component is placed in a vacuum brazing furnace, axial pre-tightening force is applied to the pre-assembled component, sealing is completed, then cooling is controlled, and a sealing piece with an airtight brazing joint is formed; and carrying out annealing treatment to obtain a finished product sealing assembly. Therefore, the problems of low dielectric strength, large thermal expansion coefficient difference, difficulty in interface quality control and the like in the prior art are solved.

The invention provides a method for inhibiting the formation of Kirkendall holes in an In-based brazing filler metal welding interface by adopting a vertical twin structure, which comprises the following steps of: respectively adhering a layer of vertical twin structure to the surfaces of an upper metal substrate to be welded and a lower metal substrate to be welded which are subjected to surface treatment in an electro-deposition manner, wherein the size of the vertical twin structure is 5 * 5 mm, the thickness of the vertical twin structure is 20-40 mu m, and the thickness of the vertical twin structure is 10 * 10 mm; the method comprises the following steps: carrying out a thermocompression bonding experiment on a pure copper coating with a vertical orientation nano twin crystal structure at set bonding temperature, pressure and time; according to the technical scheme, by means of the structural characteristic that the diffusion coefficient of the vertically-arranged twin boundaries in the nano twin structure is low, the diffusion rate of interface elements is reduced, flux balance is maintained, and the low impurity characteristic of the vertically-oriented nano twin film is utilized, so that formation of Kirkendall voids in the welding interface is limited. The method provided by the invention is simple and convenient to operate, and has great significance for improving the connection reliability of the In-based low-temperature bonding system.

The embodiment of the invention provides a heat exchanger machining method and a heat exchanger. The heat exchanger machining method comprises the steps that a heat exchange pipe and a first pipe are assembled, the heat exchange pipe and the first pipe are connected, the heat exchange pipe is made of stainless steel, and the first pipe is made of stainless steel; welding the heat exchange tube and the first tube; the fins and the heat exchange tubes are assembled, specifically, at least part of the fins are installed between the adjacent heat exchange tubes, and the fins are made of aluminum or aluminum alloy; welding the heat exchange tubes and the fins; before the heat exchange tube and the fins are assembled, an aluminum material or a nickel material is arranged on at least one part of the surface of the heat exchange tube in a covering mode to form a coating. According to the machining method, welding of the heat exchanger is achieved, the welding reliability and the reliability of the heat exchanger are improved, and the heat exchanger has good corrosion resistance. The invention further provides the heat exchanger. The corrosion resistance of the heat exchanger and the heat exchange performance of the heat exchanger are improved.

Devices and techniques include process steps for forming openings through stacked and bonded structures. The openings are formed by pre-etching through one or more layers of prepared dies after planarization of the bonding layer (by chemical-mechanical polishing (CMP) or the like) and prior to bonding. For instance, the openings are etched through one or more layers of dies to be bonded prior to bonding the dies to form an assembly.

The invention relates to a brazed heat exchanger incorporating an aluminium alloy baseplate and wherein the baseplate is made from an aluminium alloy having a composition, in wt. %, of: Mn 0.8-1.8, Cu 0.15-1.20, Si 0.25-1.30, Mg 0.10-0.60, Fe ≤0.8, Zn ≤0.3, Ti ≤0.20, Cr ≤0.25, Zr ≤0.25, balance aluminium and impurities.