411 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 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.

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 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 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 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 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 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 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 discloses a forming method and structure of a complex-shape metal-based sweating and cooling control surface, relates to the technical field of thermal protection of hypersonic aircrafts, and is used for realizing connection of a front edge structure of a control surface and a main body structure of the control surface. A defocusing electron beam is adopted to preheat the welding part; after the preheating process is ready, an electromagnetic lens is adjusted to focus an electron beam to a welding area of the workpiece, it is ensured that energy of the electron beam can be concentrated on a welding point, and welding of a control plane front edge structure and a control plane main body structure is started; welding pores are eliminated using electron beam modification welding. A complex-shape metal-based sweating cooling control surface structure is manufactured by adopting a complex-shape metal-based sweating cooling control surface forming method, the complex-shape metal-based sweating cooling control surface structure is composed of a control surface front edge structure and a control surface main body structure, and the control surface front edge structure is provided with micro channels. According to the method, the welding connection is realized by adopting a process of combining electron beam defocusing preheating before welding, vacuum electron beam welding and electron beam modification welding, so that the permeability and the pressure-bearing performance of the control surface are ensured.

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 invention discloses a small-diameter thin-wall end face electron beam welding seam arc suppression depression improving method and system, and belongs to the technical field of electron beam welding.The method comprises the steps that positioned welding is conducted on a workpiece in a vacuum environment, and a plurality of welding spots are arranged in the circumferential direction at intervals; formal welding is conducted on the workpiece subjected to positioned welding in the first welding direction; performing modification welding in a second welding direction opposite to the first welding direction; controlling the beam incremental attenuation angle, the welding current and the focusing current of the formal welding and the modification welding; and after welding, the vacuum environment is inflated after the preset time is delayed, and the welding operation of the workpiece is completed. According to the method, the problem that the arc suppression area of the welding seam is sunken is solved, the front face and the back face of the welding seam both meet the standard requirements, double-face forming of the small-diameter thin-wall end face circumferential welding seam is achieved, welding seam forming is full and complete, and the problem that the part size is out of tolerance due to the fact that the arc suppression area of the part is sunken and argon arc welding repair welding is adopted is solved; and the method has certain practicability and adaptability.

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.

A T2 red copper / 304 stainless steel dissimilar metal electron beam welding method comprises a pre-welding preparation step and a welding process step, a T2 red copper / 304 stainless steel dissimilar metal connector connected through the electron beam welding method for the copper-steel dissimilar metal does not have the defects of air holes, cracks, inclusions and the like in a macroscopic metallographic structure at the connecting position, and the welding quality is improved. The tensile test shows that the strength of the joint can reach 210 MPa.

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.