213 results about "Electron beam welding" patented technology

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 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 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 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 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.

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.

This invention discloses a lower beam channel protection device for an electron beam welding machine, comprising a base, a copper tube, arc-shaped pins, and a protective cover. A flange is fixed to the top of the final stepped channel of the lower beam channel, with the center of the flange's central hole coinciding with the center of the final stepped channel. The base has a cylindrical main structure, with the upper end of the cylinder extending horizontally outward to form an extension section. The base has a T-shaped longitudinal section, and the extension section is fixed to the lower surface of the flange. Both the base and the flange are made of copper. The copper tube is fixedly engaged in the base. The upper end of the protective cover has a first through hole with an inner diameter equal to the outer diameter of the copper tube. The upper end of the protective cover is fitted onto the copper tube through the first through hole. Several second through holes are provided on the copper tube, with the upper end of each second through hole coinciding with the lower surface of the inner side of the upper end of the protective cover. The number of arc-shaped pins is the same as the number of second through holes, and each arc-shaped pin is fixedly inserted into the corresponding second through hole. The outer edge of the lower end of the protective cover is in contact with the top surface of the vacuum chamber wall.

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 invention discloses a novel welding machine, comprising: a welding frame, the welding frame including a support frame, a sealed door on the front of the support frame, a welding chamber at the upper end of the inner cavity of the support frame, and a welding table at the bottom of the inner cavity of the welding chamber. This invention belongs to the field of welding machine technology. The purpose of this invention is to solve the problems of traditional hot cathode electron beam welding machines in the prior art, where the hot cathode requires continuous preheating, has a long start-up time, and still needs to maintain a high temperature in standby mode. The technical effect achieved is: using a directional carbon nanotube array microbeam emitter as a cold cathode, utilizing the field emission principle of carbon nanotubes, an electric field is applied between the grid and the cathode to allow electrons to escape from the tip of the carbon nanotube through quantum tunneling effect, without heating the cathode to a high temperature, achieving millisecond-level instantaneous start-up, solving the drawback of traditional welding machines requiring 5-10 minutes of preheating, and significantly improving work efficiency and equipment response speed.

The invention discloses a method for improving stress corrosion resistance of a welded joint through laser shock strengthening, and relates to the technical field of titanium alloy welded joint strengthening. The method comprises the following steps that firstly, a welding joint area of a titanium alloy welding sample is heated to 400-700 DEG C through heating of a magnetic induction coil, and then 2-5 times of laser shock peening treatment is conducted on the welding joint area with 1-10 J laser pulse energy under the heat preservation condition of 400-700 DEG C; the welding joint is obtained through an electron beam welding process; a laser spot scanning strategy of the laser shock peening treatment is the same as a scanning strategy when a welding joint is obtained through an electron beam welding process. According to the method, the stress corrosion resistance of a welding joint area is remarkably improved and the service life of the welding joint area is remarkably prolonged through the synergistic effect of magnetic induction coil heating and laser shock peening treatment and optimization of respective processes particularly aiming at the service requirement of a titanium alloy welding structure for deep sea equipment in a high-pressure and high-salt environment.

The invention provides a hollow blade and a welding method thereof.The welding method of the hollow blade comprises the steps that a body and a panel are fixed, a welding seam gap is formed in the contact position of the body and the panel, and the welding seam gap is in interference fit; the body and the panel are welded in a vacuum electron beam welding mode, so that the body and the panel are fixedly connected, and a welded part is obtained; and after welding is completed, a welded part is subjected to heat treatment. According to the welding method, the welding gap formed between the panel and the body is arranged to be in interference fit, the panel and the body are welded and fixed in a vacuum electron beam welding mode, meanwhile, heat treatment is conducted after welding is finished, and therefore the deformation can be finally controlled to be within the range that the wall thickness difference between the panel and the body is 0.15 mm, and the welding quality is improved. And the contraction of the welding seam is effectively controlled.

This invention discloses a high-resistivity NdFeB permanent magnet material and its high-throughput preparation method. Specifically, the method includes: preparing a metal cladding of suitable size; assembling NdFeB, NdDyTbFeB metal strips and rare-earth alloy diffusion source strips into grooves within the metal cladding using an alternating arrangement of the metal strips and diffusion source strips; performing vacuum electron beam welding and hot isostatic pressing; slicing and sealing the resulting multi-element section before heat treatment; and finally, screening to obtain the high-resistivity NdFeB permanent magnet material. This invention, based on a high-throughput preparation method for diffusion multi-element sections, can obtain a large number of parallel samples in a short time. Combined with high-throughput testing and characterization methods, it allows for rapid screening of suitable diffusion sources and heat treatment temperatures, enabling efficient development of high-resistivity NdFeB permanent magnet materials.

The utility model relates to a kind of low additional bending moment welding film disc coupling structure, including axle, and axle both sides are connected by flexible film disc group installation disc;Flexible film disc group includes flexible film disc and adapter disc, adapter disc is connected with axle by transmission bolt and self-locking nut, and adapter disc is connected with installation disc by flexible film disc;Flexible film disc is connected installation disc and adapter disc by vacuum electron beam welding process, and flexible film disc inner circumferential end portion is equipped with flexible inner welding surface.The utility model is connected by welding instead of bolt, effectively reduce the weight of coupling;While by flexible film disc close to installation disc, so that gravity position is close to installation disc end face, additional bending moment to shaft head can be effectively reduced, improve dynamic characteristics, adapt to high speed application.

The utility model provides a vacuum electron beam welding gun and welding chamber fixing device for a gear matching surface, which relates to the technical field of welding process, comprises a machine body and is characterized in that a vacuum pump is arranged on one side of the machine body, a console is arranged on one side of the machine body far away from the vacuum pump, and an electron beam generator chamber is arranged on the surface of the machine body. A cathode is arranged in the electron beam generator chamber, an anode is arranged at the bottom of the cathode, the electron beam generator chamber is arranged at the position of the inclined edge of the pentagon of the machine body at the inclined angle of 45 degrees, and the angle of the inclined edge of the machine body is also 45 degrees. Under the condition that deflection is not conducted through a deflection coil, the device can effectively reach the joint of the matching faces of a gear body and a shaft, so that the welding quality is guaranteed in the welding process, the welding task is completed, and the defect that electron beams can only be horizontally emitted on the surface of a workpiece for welding and cannot penetrate into the connecting line of the inner hole face of the gear and the shaft is overcome.