332 results about "Electron beam welding" patented technology

The invention discloses a method and device for predicting the fatigue life of a high-temperature alloy vacuum electron beam welding structure, and belongs to the technical field of aero-engines. The method comprises the following steps: acquiring fatigue experiment data of a target high-temperature alloy standard sample; extracting the maximum area of an initial defect, a defect shape factor and crack source position information; obtaining a stress intensity factor range considering defect morphological characteristics and a fatigue crack propagation threshold value of a material structure containing initial defects, and correcting a damage tolerance theoretical formula to obtain simulation data; fatigue test data and simulation data are fused to form an initial data set, a fatigue limit is calculated and expanded to the data set, the expanded data set serves as input, training is conducted through a support vector regression method, hyper-parameters are determined through Bayesian optimization, and a fatigue life prediction result of the high-temperature alloy vacuum electron beam welding structure is output. The method provided by the invention can well consider the influence of different morphology defects on the fatigue performance of the welded joint.

The invention belongs to the technical field of metal composite materials and hydrogen storage and transportation materials, and particularly relates to a high-strength hydrogen-embrittlement-resistant layered metal composite material for hydrogen storage and a preparation method and application of the high-strength hydrogen-embrittlement-resistant layered metal composite material. According to the preparation method, the nickel-saving austenitic stainless steel (NEASS) and the 30CrMo steel are alternately overlapped in a multi-layer mode, and the processes of vacuum electron beam welding, high-temperature hot rolling, accumulative ply rolling, multi-stage heat treatment and the like are combined, so that the composite board with the layer number reaching hundreds of layers, firm interface bonding, excellent mechanical performance and good hydrogen embrittlement resistance is prepared; the technical problem that strength, toughness and hydrogen brittleness resistance of an existing metal material in a high-pressure hydrogen environment are difficult to consider at the same time is solved. The obtained composite material has high strength, high plasticity and excellent hydrogen embrittlement resistance, and is suitable for structural materials of high-pressure hydrogen storage tanks, hydrogen conveying pipelines and other key hydrogen energy equipment.

The invention discloses stainless steel vacuum barrel welding equipment and a welding method, and relates to the technical field of welding equipment.The stainless steel vacuum barrel welding equipment comprises a main body, a sealing door is slidably connected to one end of the main body, a limiting mechanism is arranged in the main body, two sets of electric push rods are arranged in the limiting mechanism, and fixing plates are fixed to the two sides of the top end of the limiting mechanism; two sets of metal plates are arranged at one end of the sealing door, the metal plates and the sealing door are elastically connected through a plurality of sets of springs, and a first U-shaped block is fixed to one end of each metal plate. A linear motor is started through a control panel to drive a limiting mechanism to move outwards, a linkage clamping mechanism and a rotary telescopic mechanism are synchronously expanded outwards, electron beam welding is started after an external vacuum pump establishes a vacuum environment, the equipment adopts inner and outer double-side force application to ensure uniform clamping, a shape memory alloy compensates a high-temperature sealing gap, and a spring realizes automatic reset; and sealing failure caused by deformation and thermal deformation of the thin-wall cylinder is effectively prevented.

The invention discloses a dynamic regulation and control device and method for aluminum alloy electron beam welding residual stress, and belongs to the technical field of electron beam machining, and the device integrates a multi-sensing information acquisition system, a vibration system and a control system. The sensing information acquisition system measures the surface residual stress of a welding seam and a heat affected zone in real time and in situ in the welding process through a vacuum compatible X-ray probe and a detector, compares the predicted stress with a target value, and generates a regulation and control instruction of electron beam welding parameters through the control system; the electron beam welding behavior is adjusted in real time to dynamically control stress, and the vibration system is used for applying high-frequency micro-amplitude vibration to a local high-stress area of a weldment to promote residual stress release. The device integrates monitoring, regulation and stress release functions in a vacuum environment, can remarkably reduce welding residual stress and improve welding seam quality, and is particularly suitable for electron beam welding of large thin-wall aluminum alloy structural parts.

The application provides a one-time forming electron beam welding method for a titanium alloy component with single-sided incidence and double-layer welds, which comprises the following steps: a closed cavity structure titanium alloy component is formed by a plurality of mutually shielded multi-layer thin plates through single-direction electron beam incidence; the focusing current of the electron beam is adjusted; the converging effect of the electromagnetic coil is changed to change the focus position, and then the electron beam keyhole depth and size are changed; the keyhole is adjusted to be an energy channel through which the electron beam passes; the electron beam energy can pass through the first layer of welds to reach the second layer of welds; the controllable linear energy is provided by combining the acceleration voltage, the welding current and the welding speed to ensure that the remaining energy that penetrates reaches the second layer of welds to complete the welding of the second layer of welds again; the low-frequency scanning is combined with the electron beam movement to drive the first layer of molten pool metal to flow and fill the rear channel, and the front channel is opened, so that the channel is dynamically smooth and stable, and the electron beam keyhole effect behavior is adjusted.

The invention discloses a vacuum electron beam welding method for a titanium alloy structural part, and belongs to the technical field of aero-engine manufacturing. The method comprises the following steps: cleaning stains on the surface of a to-be-welded structural member; an oxidation film on the surface of the to-be-welded structural part is cleaned, and a by-product layer formed when the oxidation film is cleaned is removed in a mechanical mode; residual pollutants generated when the surface of the to-be-welded structural part is cleaned in a mechanical mode are removed, and pre-welding cleaning is completed; when the cleaned structural part to be welded is placed in a vacuum chamber of a vacuum electron beam welding machine to be welded, small-beam preheating is conducted firstly; formal welding is carried out according to pre-optimized welding parameters, and electron beam dynamic deflection is increased in the welding process. The method can reduce air hole defects in welding seams, improve the comprehensive mechanical performance of welding joints, and meet the design requirements of aeroengine component welding joints.

The invention belongs to the technical field of metal welding, and particularly relates to an electron beam welding method for molybdenum and molybdenum alloy medium and thick plates. A vacuum electron beam welding machine is used for carrying out right-angle double-face tailor welding on corrosion-resistant molybdenum and molybdenum alloy medium-thickness plates with the thickness ranging from 5 mm to 50 mm in the chemical field. Through the fixing modes of assembling and designing the welding tool and the like, the problem of electron beam welding cracking caused by deformation is avoided. In addition, by controlling electron beam welding parameters, the high-temperature nitrogen oxidation risk in the molybdenum and molybdenum alloy plate welding process is reduced, and welding tip air holes are reduced. The implementation of the method can provide guidance for welding engineering application of the corrosion-resistant molybdenum plate in the field of chemical engineering.

The invention relates to the technical field of nuclear fusion, and particularly discloses a high strength and toughness matched nitrogen control type low activation steel thick plate electron beam welding method which comprises the following steps: S1, flaw detection and grinding are performed on a thick plate to be welded; s2, demagnetization and surface cleaning are carried out; s3, an arc suppression plate and an arc striking plate are machined, the arc suppression plate and the arc striking plate are fixed to the two ends of the gap formed by the thick plate to be welded, and a plate to be welded is obtained; s4, the plate to be welded is fixed to a welding tool, and the welding tool is pushed into an electron beam welding vacuum chamber; s5, the plate to be welded is sequentially subjected to symmetrical positioning welding and symmetrical filling welding, and a welded plate is obtained; and S6, postweld heat treatment is conducted. By means of the characteristics that electron beam welding is high in penetrability, high in welding speed, high in welding joint quality in the vacuum environment and the like, the welding efficiency is high, welded plates are stable in performance and have high strength and toughness matching, and the welding quality is guaranteed.

The invention provides an ultrathin-wall niobium-tungsten alloy and titanium alloy dissimilar metal electron beam welding method which comprises the following steps: step 1, cleaning the to-be-welded parts of niobium-tungsten alloy and titanium alloy by using absolute ethyl alcohol, and then drying; step 2, assembling; the niobium-tungsten alloy and the titanium alloy part are in butt joint and fixed; 3, vacuum electron beam welding is used for positioned welding; and 4, formal welding is conducted. After welding, the surface of a welding seam is formed well, good metallurgical fusion is achieved, and the welding seam welded through a vacuum electron beam meets the QJ 20622-2016 I-level standard; under the room temperature condition, the tensile strength of the welding seam reaches 80% of that of titanium alloy base metal; a hydraulic strength test is carried out on a welding seam, and the welding seam is free of leakage and deformation when the pressure is maintained for 5 minutes under 4.1 MPa. An airtight test is carried out on a welding seam, the requirement that air leakage is avoided under the pressure of 3 MPa for 5 min is met, and the design structure size is promoted to continuously break through in the miniaturization and precision direction.

The invention discloses a 30CrMnSi alloy steel electron beam welding method and application thereof, and relates to Cr-Mn-Si alloy steel electron beam welding, and the 30CrMnSi alloy steel electron beam welding method specifically comprises the steps that a plurality of sections of cleaned to-be-welded parts are assembled in pairs to form to-be-welded weld joints, and the to-be-welded weld joints are subjected to section welding; electron beam scanning preheating is conducted on the to-be-welded weld joint after segment welding; the preheated to-be-welded weld joint is subjected to seal welding, and the focusing current is set to be in a surface focusing state during seal welding; welding the to-be-welded weld joint after seal welding, wherein the focusing current is set to be in a lower-focus state during welding; and performing modification welding on the welded weld joint, wherein the focusing current is set to be in an upper-focus state during modification welding. According to the method, under the cooperative treatment of electron beam scanning preheating, seal welding, welding and modification welding on the weld joint to be welded, the smooth weld joint without cracks, splashing and pits is finally obtained, so that the workpiece to be welded can reach the GJB-1718A standard, and the requirement for nondestructive testing of the I-level weld joint of pressure-bearing equipment is met.

The invention belongs to the technical field of material processing and welding, and provides an electron beam welding method for a fragile material, which comprises the following steps of: dividing a first stress regulation and control area covering a welding joint and a second stress regulation and control area positioned on the outer side of the first stress regulation and control area on a to-be-welded workpiece; differential heating is conducted on the two areas, so that the heating temperature of the second area is higher than that of the first area; based on the heating temperature of the first stress regulation and control area, welding parameters are determined by adopting a method of combining parameter calculation and test welding verification; welding operation is conducted in a dynamic beam adjusting mode according to the welding parameters; and performing scanning heating on a welding seam area after welding to realize cold treatment. According to the method, welding cracks of the fragile material are fundamentally restrained through an active stress regulation and control mechanism, meanwhile, the preheating process is optimized, assembly deformation caused by overall high temperature is avoided, and high-quality and high-efficiency welding is achieved in combination with a welding parameter confirmation and forming control method.

The invention belongs to the technical field of image data processing, and particularly relates to an electron beam welding quality detection method and system, and the method comprises the steps: obtaining a welding seam image under the irradiation of a light source in a fixed direction; identifying and extracting defect plaques and expanded neighborhoods thereof and reconstructing the defect plaques and the expanded neighborhoods thereof into a local three-dimensional surface; obtaining a shadow depth index representing the depth of the defect plaque by analyzing the shadow feature of the defect plaque under directional illumination; based on the maximum principal curvature and the direction of each point of the reconstructed three-dimensional surface, obtaining a stress concentration ratio for evaluating the sharpness degree and the direction consistency of the micromorphology of the defect plaque; and obtaining a comprehensive hazard index through the shadow depth index and the stress concentration ratio, and carrying out detection and quality evaluation on the defect plaque according to the index. According to the method, the high-risk defect patches and the surface flaws are distinguished by evaluating the depth and the stress concentration ratio of the defect patches, and a reliable basis is provided for welding quality evaluation.

The invention discloses an electron beam welding method for a molybdenum alloy / niobium alloy dissimilar material with a preset middle layer. The electron beam welding method aims at solving the problem that solid crack defects exist in existing electron beam welding for the molybdenum alloy / niobium alloy dissimilar material. The electron beam welding method comprises the steps that firstly, the to-be-welded faces of the to-be-welded molybdenum alloy part, the to-be-welded niobium alloy part and the to-be-welded Re middle layer are mechanically polished and cleaned after being polished; secondly, the Re middle layer is placed between the to-be-welded faces of the clean molybdenum alloy part and the niobium alloy part to form a welding assembly; thirdly, welding parameters are set; and fourthly, electron beam welding is conducted. According to the method, the Re intermediate layer is adopted to carry out electron beam welding on the molybdenum alloy / niobium alloy, the characteristic that Re can improve the toughness of the molybdenum alloy is utilized, the metal brittleness of a weld joint is reduced, the crack tendency of a joint is greatly reduced, and a crack-free and high-strength molybdenum alloy / niobium alloy dissimilar material electron beam welding joint is obtained.

The present application relates to a kind of high-temperature-resistant inductive angle sensor, belong to angle sensor technical field.The sensor includes: gradient composite ceramic substrate Al2O3-ZrO2-Al2O3, realize thermal expansion coefficient gradient matching by intermediate layer zirconium oxide doped yttrium oxide, reduce thermal stress cracking risk;Substrate surface is formed with micro-arc oxidation porous layer in turn titanium nitride nanocrystalline layer, improve surface bonding force;Atomic layer deposition process is used to prepare TiN or TiN / Ag composite film coil, improve temperature resistance;Through electron beam welding and transient liquid phase bonding composite process coil and circuit;Insulating encapsulation layer is made of boron nitride nanosheet and high-temperature-resistant resin, improve thermal conductivity and breakdown field strength.The present application is through gradient substrate design, thin film coil integration and composite process optimization, solves the thermal stress failure of traditional inductive sensor under high temperature, coil oxidation and insulation aging problem, suitable for angle measurement under extreme environment.

This utility model relates to the field of welding technology, specifically an electron beam welding fixture for clamping a workpiece. The workpiece consists of a flat portion and a bridge-shaped portion, with the two flat portions respectively located on both sides of the bridge-shaped portion. A groove is provided on the back of the bridge-shaped portion, and a ring of welds consisting of a straight weld and a circular arc weld on opposite sides is provided on the bridge-shaped portion. The fixture includes an "L"-shaped plate composed of a horizontal plate and a vertical plate. The horizontal plate consists of a fixture flat portion and a fixture bridge-shaped portion that respectively mate with the flat portion and the bridge-shaped portion of the workpiece. A protrusion on the fixture bridge-shaped portion mates with the groove on the back of the bridge-shaped portion. A workpiece positioning structure and a workpiece fastening structure are provided between the flat portion of the workpiece and the fixture flat portion. This electron beam welding fixture can reduce welding deformation of special structure workpieces, ensure post-weld dimensional accuracy, ensure the welding quality of arcs and junctions, and meet special welding requirements.

This invention relates to a method for simultaneously producing single-sided and double-sided stainless steel composite plates, comprising steps such as billet preparation, billet processing, application of release agent, spot welding assembly of composite materials, surface treatment of the composite billet, alignment of the assembly, vacuum electron beam welding, defect repair welding, heating of the composite billet, and rolling of the composite billet. This invention, through vacuum welding and heated rolling of double-layer sandwich plates, enables the simultaneous production of both single-sided and double-sided stainless steel composite plates from a single set of composite billets. The rolled stainless steel composite plates exhibit satisfactory flaw detection results, with performance far exceeding user requirements. Furthermore, it allows for mass production and industrialization, providing strong technical support for the stable production of single-sided / double-sided stainless steel composite plates.

The invention provides automatic pipe fitting welding equipment and a welding method. The equipment comprises a mounting plate, two groups of movable clamping mechanisms, two groups of fixed clamping mechanisms, a polishing mechanism and a welding mechanism, the mounting plate comprises a first flat plate and a second flat plate; the fixed clamping mechanism is arranged between the movable clamping mechanisms, and the two clamping mechanisms are located on the same straight line. The movable clamping mechanism comprises a sliding rail and a movable support. The fixed clamping mechanism comprises a fixed bracket; the grinding mechanism is arranged on the second flat plate and comprises a grinding machine; the welding mechanism is arranged between the fixed clamping mechanisms and comprises a mounting box, a driving wheel, a welding ring, a rotating ring and electron beam welding; a motor is arranged in the mounting box and connected with a driving wheel, a welding ring is arranged on the mounting box and rotationally connected with a rotating ring, the rotating ring is meshed with the driving wheel, and electron beam welding is arranged on the rotating ring. The method can be realized through the equipment. According to the equipment, the end parts of the two butted pipe fittings can be contacted and sealed, and the welding quality is ensured. The method is high in efficiency.

The present invention relates to a tantalum alloy welding method, comprising: splicing two tantalum alloy plates A1 and A2 to be welded to obtain a gap B1 to be welded; pre-processing the two tantalum alloy plates A1 and A2 along the position of the gap B1 to be welded, wherein the pre-processing method is as follows: adjusting the width of the gap to be welded between the tantalum alloy plates A1 and A2, drilling holes in the splicing surfaces of the tantalum alloy plates A1 and A2 along the thickness direction, wherein the diameter of the drilled holes is 0.5 mm to 1 mm larger than the adjusted width of the weld, and the depth of the drilled holes is equal to the thickness of the tantalum alloy plates A1 and A2; inserting a tantalum alloy welding rod of the same material into the drilled gap, reducing the width between the welding rod and the plates, thereby obtaining a new gap B2 to be welded; using electron beam welding to weld the new gap B2 to be welded; and completing the welding to obtain a tantalum alloy plate welded part. The present invention has the advantages of high welding strength, good sealing performance, and low residual stress, and can achieve reliable connection of tantalum alloys.

The invention relates to the technical field of aerospace material processing, in particular to a laser hybrid welding method for a pressure vessel lock bottom structure, which comprises the following steps: step 1, carrying out pre-welding treatment on a welded junction of the pressure vessel shell lock bottom structure; 2, the equatorial seam of the pressure container is assembled, and a mechanical arm multifunctional tool is adopted for fixed spot welding; 3, local preheating is conducted on a welding seam of the equatorial seam; fourthly, laser hybrid welding is conducted on the whole pressure container in a laser-TIG composite mode; and 5, after welding is completed, inspection and treatment are conducted. By means of the laser-TIG composite welding technology, the problem that an electron beam welding gun cannot conduct all-position welding is solved, and the problems that a key hole is unstable through single-laser welding and air holes do not reach the standard under other arc welding non-vacuum conditions are solved; and a mechanical arm multifunctional tool is arranged, the welding efficiency and the assembling precision are improved, and the problem that the electron beam welding vacuum chamber limits the product structure size is solved.

The invention relates to the technical field of electron beam welding, in particular to a neural network model training and process parameter optimization method for an electron beam welding process, and the method comprises the steps: obtaining the historical experiment data of the electron beam welding process; a data set is generated according to historical experimental data, a pre-constructed neural network model is trained through the data set, model parameters of the neural network model are updated based on error back propagation in the training process, and the input of the neural network model is welding parameters and the thickness of a base plate; the output of the neural network model is weld quality, welding energy consumption and machining allowance; and the trained neural network model is used for monitoring the weld quality, the welding energy consumption and the machining allowance of the electron beam welding process, and welding parameters and the thickness of the base plate are optimized according to the weld quality, the welding energy consumption and the machining allowance. Therefore, the problems of unstable welding quality, high welding energy consumption, high subsequent machining amount, high production cost, low production efficiency and the like in the prior art are solved.

The multi-redundancy high-voltage electric explosion valve comprises a shell, a cutter, a pin, a cutting cap, a piston, a small spring, an adapter, an O rubber ring, a check ring, a gasket and an igniter. The piston and the cutter are arranged in an inner cavity of the shell; the small spring and the pin are sequentially arranged in the cutter; the cutter and the piston are provided with O-shaped rubber ring grooves, and the O-shaped rubber ring and the check ring are arranged in the O-shaped rubber ring grooves; the cutting caps on the two sides are installed in the installation holes of the shell in a threaded connection mode. The adapter is installed on the shell through threads and then connected through laser welding or electron beam welding. A conical structure is arranged on one side of the cutter; a pin lock groove and a conical groove are formed in the side wall of the inner cavity of the shell. The multi-redundancy high-voltage electric explosion valve is provided with a split type shearing moving part, after the igniter is detonated, shearing and springback prevention can be achieved by directly utilizing the acting force of a high-pressure medium, and the design difficulty of shearing and springback prevention of the electric explosion valve under the high-pressure working condition can be effectively solved.

A method for manufacturing a structure comprising cavities, the method comprising the following steps: a) forming hollow areas (110) in a first face (101) of a substrate (100) made of a first material, b) depositing a plate (200) made of a second material onto the first face (101) of the substrate (100), so as to cover the hollow areas (110) of the substrate (100), c) performing resistance welding, electron beam welding, or laser beam welding, preferably under vacuum, around the hollow areas, thereby welding the plate (200) onto the substrate (100) and forming cavities, d) performing a hot isostatic compression diffusion welding step on the assembly obtained. Figure for the abstract: 5A

The present application relates to the technical field of electron beam welding, in particular to a tube sheet welding tool and a welding method, the welding tool comprises an inner support, a backing ring and a heat dissipation assembly, the inner support supports the pipe opening of the connecting pipe, so that the pipe opening of the connecting pipe is not prone to collapse during the welding process, the backing ring is supported on the side of the tube sheet away from the to-be-welded part to block and dissipate heat on the back side of the weld, so as to avoid melting through on the back side of the weld, and the control of the weld width and the penetration depth is realized, at the same time, the heat dissipation assembly is attached to the side of the backing ring away from the to-be-welded part to dissipate heat on the back side of the weld, so as to avoid the deformation of the tube sheet during the welding process, the cooperation of various structures ensures the welding quality and improves the fusion rate; the tube sheet welding method adopts the above welding tool and adopts the welding sequence of spot welding, pre-welding and formal welding, so as to avoid the collapse of the pipe opening of the connecting pipe during the welding process, and the weld width and the penetration depth are easy to control, and the welding quality and the fusion rate can be effectively improved.

The application provides a cavity structure part annular electron beam welding joint design method, which comprises the following steps: tilting the angle of the radial ring weld of a part along the part axis direction clockwise by a preset angle, so that the closest distance of the beam current to the flange edge of the part casting body on the side of the radial ring weld is increased, the welding lock bottom is also increased in thickness due to the tilt of the weld, the part can be prevented from being damaged during welding, and the risk of splashes generated by penetrating the welding lock bottom is reduced; a filler platform is arranged on the side of the cover plate at the radial ring weld, which can help quickly find the weld position in the equipment observation system and facilitate welding; the axial ring weld of the part is offset to one side of the part casting body by a preset distance, so that the weld is changed from a no-welding lock bottom end face weld to a welding lock bottom butt joint weld, a boss is added to the inner wall of the cover plate to form a butt joint structure with the casting body, so that non-penetration welding can be ensured, and welding splashes in the part inner cavity are prevented.

The invention provides a quantitative evaluation method for micro-area comprehensive mechanical properties of an electron beam welding joint, and belongs to the technical field of material mechanical property evaluation.A load-displacement curve is obtained through a nanoindentation test, and a data processing method combining numerical integration and high-order derivative calculation is adopted, so that the comprehensive mechanical properties of the electron beam welding joint are evaluated. Meanwhile, three performance parameters of strength, plasticity and strain hardening are extracted, and a quantitative mapping relation between the three performance parameters and the microcell structure is established. The method solves the problem of mechanical property quantitative evaluation of gradient structures of a fusion zone, a heat affected zone and a base metal zone of a welding joint, and the problems of high cost, low efficiency, single parameter and the like in the existing evaluation technology.

The invention discloses a welding process for a storage tank with a step Z-shaped curve welding seam, and belongs to the technical field of electron beam welding. The method is used for solving at least one of the problems that in the prior art, when electron beam welding is used for Z-shaped step focusing current, it is difficult to quickly respond to frequent fluctuation of the working distance, welding defects occur to weld joints, and an assembly tool cannot stably fix a storage box. The storage box welding process comprises the steps that a first end frame, a second end frame, a left side skin, a right side skin and a lower side skin are placed on an assembly tool and assembled in place; performing positioned welding on to-be-welded welding lines of the first end frame, the second end frame, the left side skin, the right side skin and the lower side skin; and electron beam welding is conducted on the first end frame, the second end frame, the left side skin, the right side skin and the lower side skin. The method can be used for welding the storage tank with the step Z-shaped curve welding seam.

The utility model discloses an electron beam welding machine which comprises an installation base, a driving module and a welding module, the driving module is installed on the installation base, the welding module is installed on the driving module, and the installation base comprises a bottom plate and a first installation plate. The first installation plate is fixedly installed on the bottom plate and is perpendicular to the bottom plate. According to the electron beam welding machine, linkage is carried out through the installation base, the driving module and the welding module, the driving module is started according to the welding requirement, so that the welding module is driven to move to the position needing welding, and the electron beam welding machine has the advantages of being stable in structure, high in efficiency, high in practicability and the like.

The invention discloses a preparation method of a high-flow niobium-zirconium alloy heat exchange plate. The preparation method comprises the following steps: 1, preparing a plate blank; 2, material reduction processing of the first plate sheet; thirdly, material reduction machining is conducted on the second plate sheet; 4, aligning and pressing the first plate and the second plate; and fifthly, the first plate and the second plate are welded through electron beams. Through an internal mechanical interlocking structure, the problem of medium interpenetration between flow channels is effectively solved while large flow is achieved, and the heat exchanger has high structural reliability and is particularly suitable for heat exchange scenes of severe media such as liquid metal, diffusion welding is replaced with the electron beam seal welding process, and the heat exchange efficiency is improved. And the problem of runner crushing caused by local pressure concentration is fundamentally avoided.

The application discloses a kind of magnetic field shielding method and device of mechanical pump electron beam welding, based on the simulation analysis of the magnetic field distribution at the weld of mechanical pump, according to the shape of mechanical pump, iterative design magnetic field shielding device, adopt high permeability permalloy to make " two half splicing " type double shielding structure, the splicing seam of inside and outside two shielding layers is 90 ° angle, installed in the periphery of mechanical pump, in the premise of not changing the performance of mechanical pump itself, not transforming electron beam welding equipment realizes beam current no deflection in the process of mechanical pump electron beam welding, realizes the precision welding of mechanical pump.

Embodiments of the present application relate to the technical field of electron beam welding, and particularly relate to a welding method for connecting molybdenum alloy and niobium alloy dissimilar materials, which comprises the following steps: S1, preparing a molybdenum alloy test sample and a niobium alloy test sample, and adopting an electron beam welding process to perform bias welding on the molybdenum alloy test sample and the niobium alloy test sample with a first bias beam amount, to obtain a welded test sample; S2, determining a molybdenum alloy side fusion line of the welded test sample, and determining an included angle between a butt joint surface of the molybdenum alloy test sample and the molybdenum alloy side fusion line of the welded test sample; S3, determining actual welding parameters for performing bias welding on a molybdenum alloy actual sample and a niobium alloy actual sample by using the electron beam welding process, according to the included angle, the first bias beam amount and a thickness of the molybdenum alloy test sample; and S4, welding the molybdenum alloy actual sample and the niobium alloy actual sample according to the actual welding parameters. The welding method provided by the embodiments of the present application is conducive to improving the welding quality.