566 results about "Electron beam welding" patented technology

The invention relates to the technical field of data processing, in particular to an electron beam welding state detection method and system, and the method comprises the steps: obtaining a voltage data sequence in a welding process; interpolating missing data in the voltage data sequence by using an HTFE algorithm, calculating a correction value of a prediction interval error factor in the HTFE algorithm when each missing data is interpolated, and replacing the corresponding missing data by using the voltage data at the corresponding moment predicted based on the correction value to obtain a complete data sequence; and performing anomaly detection on the complete data sequence, and detecting the welding state based on an anomaly detection result. The welding state of the electron beam can be accurately detected.

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 relates to the technical field of aero-engines, in particular to a weak-rigidity welding casing blade bending deformation control method which mainly comprises the following steps: firstly, setting the steps of performing electron beam welding on a blade, an inner casing and an outer casing: positioned welding, penetration welding and modification welding; then setting the electron beam welding sequence of strip welding seams between the blade and the inner casing as well as between the blade and the outer casing as the third welding seam, the fourth welding seam, the first welding seam and the second welding seam; and finally, the electron beam welding step in the first step is executed on the four welding seams according to the electron beam welding sequence determined in the second step. According to the mechanism of generation of welding buckling deformation, the welding buckling deformation of the blade is compensated by setting the steps of weak-rigidity cartridge receiver blade electron beam welding and setting the welding sequence, the straightness of the cartridge receiver blade is controlled, meanwhile, the influence on stress concentration parts such as a blade body anti-icing groove hole is reduced, the probability of fatigue cracks is reduced, and the service life of the cartridge receiver blade is prolonged. Therefore, the service life of the engine case is prolonged.

The invention relates to a vacuum electron beam welding method for an extra-thick double-sided stainless steel composite blank. The vacuum electron beam welding method comprises the steps that S1, a blank is prepared; s2, processing the surface of the base material carbon steel; s3, processing the surface of the composite stainless steel; s4, assembling and vacuum electron beam direct welding are carried out twice; s5, performing surface anti-oxidation spraying and packaging treatment on the double-sided composite blank after secondary welding; s6, heating the composite blank in a heating furnace, and rolling; and S7, the composite blank is rolled to the thickness required by the product according to the rolling ratio required by the finished product, and the stainless steel + carbon steel + stainless steel extra-thick double-sided stainless steel composite plate can be obtained after cooling. According to the method, the key technical bottleneck of producing the extra-thick double-sided stainless steel composite blank through the vacuum electron beam welding process is solved, particularly, the influence of vacuum electron beam welding magnetic blowing is eliminated, and powerful technical support can be provided for follow-up variety development and stable production.

The invention provides a large-thickness electron beam weld defect repair welding spot X-ray positioning method which comprises the following steps: S1, adopting vertical transillumination for the first time to find defects; s2, selecting a heavy metal marker and arranging; s3, preliminarily positioning the relative position of the marker and the defect; s4, performing primary iterative positioning; s5, iterating for multiple times until the relative positions of the positioning marker and the defect are adjusted; s6, carrying out oblique incidence and transillumination arrangement; s7, picking off the film; s8, washing the film; s9, the position of a repair welding spot and the repair welding depth are measured and calculated; and S10, ending the detection. According to the X-ray positioning method for the repair welding spot of the large-thickness electron beam welding seam defect, a heavy metal marker selection method and an oblique incident ray defect positioning method are arranged, so that rapid and accurate positioning of repair welding of the large-thickness electron beam welding seam defect is realized.

A tailor-welding, spinning and variable-wall-thickness forming method for a large-sized extension section of a liquid propellant rocket engine, which belongs to the technical field of metal forming. The method comprises: performing laser numerical control machining on a GH3044 superalloy to obtain two chord-tangent circles; performing electron beam welding to obtain a complete circle; performing a vacuum solid solution treatment; performing pre-forming to obtain a shallow dish shape; performing a vacuum solid solution treatment; assembling a variable-wall-thickness flat blank and a spinning mandrel of a first spinning die, and then performing spinning on a spinning machine to form a curved generatrix variable-wall-thickness blank part; performing a vacuum solid solution treatment; and assembling the curved generatrix variable-wall-thickness blank part and a spinning mandrel of a second spinning die, and then performing spinning on the spinning machine to form a curved generatrix variable-wall-thickness part. The present invention is mainly used for the manufacturing of an ultra-large-sized GH3044 extension section of the liquid propellant rocket engine, which has a diameter of 1200 mm and a length of 1500 mm, and the product precision reaches a wall thickness tolerance of + / -0.05 mm for each point and a surface profile of ≤3 mm.

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 relates to the field of cyclotrons, and discloses a cavity electron beam welding device and method for a high-frequency cavity of a proton cyclotron, and the device comprises a base which comprises a switching part and two fan-shaped parts; the limiting mechanism comprises first components, a second component and a third component, and the third component, the second component and the two first components jointly define a first limiting space; the first supporting component is detachably arranged on at least one fan-shaped part, and a second limiting space is formed between the first supporting component and the second component; the second supporting part is detachably arranged on one fan-shaped part, and a third limiting space is formed between the second supporting part and the second part; a third support member selectively disposed on an upper side of the second support member; and the lateral limiting piece is arranged on the other side, close to the switching part, of the fan-shaped part, and the lateral limiting piece is detachably connected with the fan-shaped part. The number of welding tools and the welding frequency can be reduced, and the welding efficiency is improved.

The invention provides a scanning electron beam-brazing composite welding method suitable for a closed cavity structure. The scanning electron beam-brazing composite welding method comprises the steps that S1, test welding is conducted; determining electron beam critical penetration welding parameters; determining scanning parameters of scanning electron beam critical penetration welding; determining scanning electron beam-brazing composite welding parameters; s2, welding seam machining and cleaning treatment; s3, brazing filler metal is selected and filled; s4, tool fixing and spot welding are carried out; s5, scanning electron beam-brazing composite welding is carried out; and the part fixed by the tool is placed in a vacuum chamber of an electron beam welding machine, then the part is welded through the electron beam welding and scanning parameters determined in the step S1 of test welding, and scanning electron beam-brazing composite welding of the part is achieved. The defect that in the electron beam welding process of the closed cavity structure, electron beams easily flow through large burns of metal opposite to a weld joint or are too small to cause non-welding is overcome, and therefore high-quality welding of the closed cavity structure is achieved.

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 relates to the technical field of electron beam welding seam structure performance regulation and control, in particular to an electron beam welding seam structure performance regulation and control method which comprises the steps that a workpiece to be welded is preheated; the preheated workpiece to be welded is welded through electron beams, and a welded workpiece is obtained; and the welded workpiece is subjected to postweld heat treatment, and the electron beam welding seam structure performance regulation and control work is completed. According to the method, welding and post-welding furnace heat treatment can be achieved under the high-temperature preheating condition under the crack control and structure property regulation and control process of high-temperature preheating electron beam welding and furnace heat treatment, welding cracks are avoided through high-temperature preheating electron beam welding, meanwhile, post-welding reheating cracks are avoided through furnace heat treatment, and the welding quality is improved. Weld joint residual stress is eliminated, and weld joint structure performance regulation and control are achieved.

The invention relates to a vacuum electron beam welding method for platinum-iridium alloy, which comprises the following steps: S1, pre-treating a platinum-iridium alloy plate to be welded, S2, fixing the pre-treated platinum-iridium alloy plate, and enabling a to-be-welded area to be tightly connected and to be positioned in an electron beam welding working area; s3, electron beam butt joint parameters and welding parameters are set, vacuumizing is conducted, the platinum-iridium alloy plate to be welded is preheated, and welding is conducted; and S4, after welding is completed, a weldment is cooled. According to the welding method, the technical defects existing in platinum-iridium alloy welding are overcome, the machinable range is wide, after welding, a platinum-iridium alloy plate and a welding area are not oxidized, impurity elements are not introduced, the volatilization loss of platinum-iridium precious metal is extremely small, and the uniformity of molten metal components and structures of a weld joint is guaranteed. And after welding, the connection strength is reliable, welding defects such as cracks and air holes do not exist, the mechanical property is close to that of a platinum-iridium alloy welding joint, the welding quality is excellent, and a new optional thought is provided for the platinum-iridium alloy machining technology.

The invention provides a multi-process combined processing method for a large-size titanium alloy frame type structural member, which comprises the following steps: segmenting the large-size titanium alloy frame type structural member to obtain a plurality of process models and welding joint models on the process models; titanium alloy blank forging is conducted according to the process models and the welding joint models, semi-finish machining is conducted after blank forging is completed till the sizes of the process models are achieved, and the multiple process models are obtained; vacuum electron beam welding is conducted on the multiple process models, heat treatment is conducted after welding is completed, and after heat treatment is completed, surface allowance is removed through machining, and a part is obtained; and the quality of welding seams of the parts is detected through X-ray detection and ultrasonic flaw detection, and manufacturing of the large-size high-strength titanium alloy frame type structural parts is achieved.

The invention belongs to the technical field of bimetallic composite materials, and provides a copper-aluminum bimetallic composite material and a preparation method thereof. The method comprises the following steps: coating an aluminum material with a copper strip, sealing through continuous electron beam welding, carrying out continuous equal channel angular extrusion on the copper-aluminum bimetallic material, carrying out heat treatment on the deformed copper-aluminum bimetallic material, and then carrying out extended extrusion or drawing to obtain the copper-aluminum bimetallic composite material. Aluminum is used for replacing part of copper, the overall weight of the material is reduced on the premise that the high conductivity of pure copper is kept, copper resources are saved, and the production cost is reduced. After ECAP extrusion, the strength performance of the material is improved by 3-5 times; after heat treatment, work hardening disappears, and subsequent machining treatment is facilitated; after expansion extrusion, the copper-aluminum bimetallic material is processed into a copper-aluminum bimetallic bar; and after further rolling and drawing, a bimetal plate or an ultra-fine grain wire is formed, and the material is restrained by a roller and a die hole to form an accurate size and a smooth surface.

The invention discloses a preparation method of a clad steel plate, the clad steel plate prepared by the preparation method and application of the clad steel plate. The composite steel plate comprises a base plate layer and a covering layer, a single face of the covering layer is composited on the base plate layer, the base plate layer is made of weathering resistant steel, and the covering layer is made of stainless steel. The preparation method comprises the first step of pretreatment, the second step of assembly, the third step of seal welding, the fourth step of hot rolling, the fifth step of cooling and coiling treatment and the sixth step of heat treatment, vacuum electron beam welding is adopted in the third step, and differential multi-pass rough rolling and multi-pass finish rolling are adopted in the fourth step. The interface bonding rate of the composite steel plate provided by the invention reaches 100%, and the strength, the elongation, the impact property and the bending property are uniform and stable and are all higher than the standard requirements of steel for the truck body.

The invention provides an electron beam welding method for a ZL114A cast aluminum alloy oil tank product. The method comprises a pre-welding preparation step and a welding step. Wherein the welding part comprises the steps of spot fixed position welding and sealing welding of formal welding. According to the electron beam welding method provided by the invention, the defects of air holes, inclusions and the like in electron beam welding of ZL114A cast aluminum alloy fuel tank products are overcome.

The disclosure relates to an hydraulic accumulator, in particular a diaphragm accumulator, having an accumulator housing and a separating element disposed therein, which separates two media spaces from each other, wherein a weld seam is formed by a laser or electron beam welding process without any filler materials, in that at least a part of the wall parts delimiting the transition point are melted to form the weld seam, which closes off the transition point towards the surroundings, in a manner that is free of protrusions with respect to an outer circumferential surface of a connection element.

The invention discloses a vacuum electron beam welding quality monitoring method and system based on molten pool monitoring, and relates to the technical field of vacuum electron beam welding quality monitoring.The method comprises the steps that a molten pool panoramic image, gas flow, electron beam parameters and molten pool dynamic parameters are collected in real time and stored in an electron beam welding time sequence database; monitoring the pollution degree of a camera window to obtain a window pollution rate wic, setting a window pollution threshold Twi, and when wic is less than Twi, directly calculating the stability of a first molten pool; when wic is greater than or equal to Twi, dynamically changing the gas flow, cleaning a camera window, then running a molten pool stability correction strategy, and further compensating the molten pool stability according to the window pollution rate and the vacuum degree to obtain corrected molten pool stability; surface abnormity is monitored through a molten pool image, a workpiece joint surface abnormity coefficient is obtained, and an electron beam welding quality score is obtained by combining molten pool stability. According to the method, the influence of molten pool stability calculation errors caused by the window cleaning process is solved.

The invention provides a welding wire and maraging steel welding method. The method comprises the steps that a to-be-welded material is subjected to solution treatment and cold treatment, and solution treatment, cold treatment and aging treatment; designing a welding groove of a material to be welded, wherein the welding groove comprises a V-shaped lock bottom butt joint groove and an I-shaped lock bottom butt joint groove; before welding, oxide layers in a welding groove and a nearby 30mm area are removed in a mechanical removal or polishing mode; the to-be-connected workpiece is assembled, wherein the local assembling clearance is not larger than x; setting welding process parameters according to the to-be-obtained front and back welding width conditions of a welding joint, setting a welding speed, a welding current and a fuse speed by gas shielded welding or setting an acceleration voltage, a welding beam current, a filament current and a rotating speed by electron beam welding; and according to the set welding process parameters, maraging steel wire filling welding is carried out under the inert gas shielding condition of gas shielded welding, or maraging steel electron beam welding is carried out under the vacuum condition.

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 utility model relates to the technical field of a carbon dioxide gasification pry, and discloses a finned tube of a gasifier on an air temperature type carbon dioxide gasification pry, which comprises a central tube and heat exchange fins. The heat exchange fins are fixedly arranged on the outer edge of the central pipe in a circumferential array mode, extend outwards and are connected with the central pipe through laser welding or electron beam welding, so that the gasification efficiency is improved. An inner side channel of the central pipe is divided into an inner channel and an outer channel by an inner pipe, an inner shaftless spiral spoiler is arranged in the inner channel, and an outer shaftless spiral spoiler is arranged in the outer channel, so that the turbulence degree and the heat exchange effect are improved. Grooves are evenly distributed in the two faces of each heat exchange fin to increase the heat exchange area and the heat conduction rate. The two ends of the inner pipe are connected with the central pipe through connecting rods which are annularly arranged at equal intervals, firm connection is ensured, and leakage is reduced. And the external thread interface ensures the sealing performance of the end cover. The design of the finned tube can improve the gasification efficiency of carbon dioxide, reduce energy consumption and improve the reliability and stability of equipment.

The utility model discloses an electron track control device and a vacuum electron beam seal welding device, the electron track control device comprises N pairs of metal plates which are opposite pairwise, the middle point of the relative distance of each pair of metal plates is coaxial with the center line of an electron beam, and each pair of metal plates is provided with a uniform electric field; when an upper-layer welding seam is welded, applying a uniform electric field to counteract an upward deflection force generated by an electron beam under the influence of the magnetic field; when a lower-layer welding seam is welded, a downward deflection force generated by an electron beam under the influence of a magnetic field is counteracted by applying a reverse uniform electric field; according to the vacuum electron beam seal welding device, the welding precision of electron beams can be effectively improved, the seal welding quality of a titanium steel composite blank is guaranteed, and a continuous, uniform and large-fusion-depth seal welding joint is formed; and the problems of electron beam drifting, welding seam deflection, welding missing, low fusion depth and the like easily occurring in the current vacuum electron beam welding technology for the magnetic titanium steel composite blank are effectively solved.

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 discloses a multi-blade combined structure electron beam welding tool and a welding method, and belongs to the technical field of welding, the multi-blade combined structure electron beam welding tool comprises a sliding table, a base and a rotary drum bearing assembly, and further comprises a rotary drum positioning mechanism for positioning and centering a rotary drum in a multi-blade combined structure; the blade bearing assembly is used for bearing the blades in the multi-blade combined structure and promoting the blades to abut against the rotary drum; the driving assembly drives the rotary drum bearing assembly to adjust the position of the rotary drum in the vertical direction or drives the rotary drum positioning mechanism to abut against the inner wall of the rotary drum; the second rotating assembly drives the rotating drum positioning mechanism to rotate in the vertical direction and is matched with the rotating drum positioning mechanism to detect the balance of the rotating drum or the welded multi-blade combined structure; according to the multi-blade combined structure assembling device, multi-blade combined structures of various specifications can be automatically assembled, and the balance of a rotating drum or the welded multi-blade combined structure by the rotating drum positioning mechanism can be detected, so that the welding efficiency is improved, and the yield is increased.

The invention relates to the technical field of aero-engine titanium alloy rotor blade repair, in particular to a stress regulation and control method for improving fatigue strength of a titanium alloy rotor blade after welding repair, which comprises the following steps: vacuum heat treatment, self-adaptive machining, first vibration finishing, laser shock peening, shot peening and second vibration finishing. Performing vacuum heat treatment on the blade subjected to electron beam welding repair; a machining program is compiled, machining is conducted on the patch repairing area, and the blade with the profile size meeting the use requirement is obtained; and after the first time of vibration finishing, laser strengthening equipment is used for carrying out laser strengthening on the blade area needing to be strengthened, shot blasting is carried out, then second time of vibration finishing is carried out, and the stress regulation and control method is completed. The vibration fatigue strength of the repaired blade is improved by 30% compared with that of a welding heating treatment process, the service life of the blade is effectively prolonged, the use performance requirement of parts is met, the maintenance and part replacement cost of an aero-engine is reduced, and the method has large economic benefits.

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 relates to the technical field of nuclear materials. The invention discloses a welding method of a metal hafnium plate, which comprises the following steps of: pretreating a to-be-welded surface of the to-be-welded metal hafnium plate to obtain the treated to-be-welded metal hafnium plate; aligning the two treated metal hafnium plates to be welded in a first plane, and performing spot welding and fixing to obtain a test piece to be welded; and the to-be-welded test piece is fixed to a welding platform, and high-frequency oscillation scanning electron beam welding is conducted on the to-be-welded test piece in a vacuum electron beam welding machine. During vacuum electron beam welding, the electron beam high-frequency oscillation scanning process is added, stirring oscillation of a welding pool is achieved, effective overflow of internal gas is promoted, welding defects are reduced, a certain inhibiting effect on growth of crystal grains in a welding seam is achieved, and the mechanical property of the welding seam is improved.

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.