424 results about "Dissimilar metal" patented technology

The invention relates to the field of welding process control, and discloses a pipeline all-position automatic TIG (Tungsten Inert Gas) welding method which comprises the following steps: collecting pipeline geometric parameters, welding position angles and material attribute data in real time through multi-source data fusion; constructing a Gaussian process regression dynamic response model, coupling a nonlinear mapping relationship among the process parameters, the molten pool morphology and the corrosion tendency index, and dynamically adjusting the weight of the model based on the welding position angle; a hierarchical strategy of Bayesian optimization and model prediction control is adopted to generate a parameter solution set meeting the fusion depth constraint and the corrosion threshold value, and the molten pool oscillation frequency is used as feedback to correct the current in real time; the heat accumulation evolution trend is predicted through a hidden Markov chain, and parameter closed-loop migration and trajectory compensation are achieved in combination with molten pool flow field coupling correction. The problems of uneven forming quality and corrosion risk caused by space displacement, dissimilar metal interface effect and dynamic disturbance in all-position welding are solved.

The invention discloses a dissimilar metal laser welding device based on swing light beams and molten pool state monitoring. The dissimilar metal laser welding device aims at improving the welding quality and the joint stability. The device comprises a laser welding head with a light beam swinging function, and the laser welding head can implement nonlinear energy scanning in a welding area according to a preset track type, frequency and amplitude; the acquisition module can synchronously acquire a visual image, an excitation spectrum and an infrared thermal imaging signal of the molten pool at a high frame rate, and extracts interface diffusion and metal mixing characteristics through multi-modal fusion; the calculation module performs dynamic feature modeling according to the collected physical feature information and the swing parameters, and quantifies multi-dimensional state indexes of the welding quality; the control module carries out combined adjustment on the laser power, the welding speed and the swing parameters according to the state indexes, closed-loop feedback control is constructed, and therefore real-time stable regulation and control and defect suppression in the dissimilar metal welding process are achieved.

The invention relates to the field of welding devices, and discloses a laser swing welding device and a welding method.The laser swing welding device comprises a supporting table, an adjusting mechanism, a swing mechanism, a laser welding head, a gradient temperature changing mechanism, a housing, an air supply mechanism, an air injection preheating mechanism and a clamping mechanism; the adjusting mechanism is arranged on the supporting table and connected with the gradient temperature changing mechanism so as to change the welding position of the laser welding head. A first plate body and a second plate body are placed on the supporting table so as to be limited by the clamping mechanism. The laser welding head is rotationally arranged on the housing and driven by the swing mechanism so as to conduct swing welding on the welding position between the first plate body and the second plate body. Through cooperation of the gradient temperature changing mechanism, the ultrasonic transducer and the gas supply and jet preheating mechanism and cooperation of the eccentric driving disc and the swing frame, preheating of protective gas, gradient cooling after welding and heating are achieved, thermal stress and thermal shock are reduced, the welding seam performance is improved, laser energy is evenly distributed, and the welding quality of dissimilar metal plates is improved.

The invention relates to the technical field of metal powder processing, and discloses a high-performance dissimilar metal powder precision forming process which comprises the following steps: filling powder into a mold cavity, applying vibration disturbance, monitoring the change rate of a phase lag angle, judging that the powder is dense when the change rate is lower than an offset threshold value, outputting a pressing mode switching signal, an induction heating device is used for applying transient thermal load to induce cracks of an oxide film on the surfaces of particles, the pressure load is applied, the side wall is adjusted to generate shear displacement to peel off the oxide film, and metallurgical bonding is achieved through fresh metal surface contact. An interface is activated through thermal expansion mismatch and mechanical friction synergistically, a high-density uniform green body is obtained at low temperature, generation of brittle intermetallic compounds is inhibited, and the fatigue resistance of a formed part is enhanced.

The invention relates to the technical field of laser welding, in particular to a dissimilar metal laser welding device which comprises a base, and a welding area is arranged at the top of the base. According to the dissimilar metal laser welding device, through an intelligent airflow isolation system, a flexible baffle structure pressurized by a spring is adopted, and dynamic sealing is formed by automatically attaching to the surface of a workpiece in the welding process. A protective air curtain is built around a welding area, cooling airflow is allowed to pass through the peripheral area to achieve overall cooling, airflow disturbance directly blown to a welding seam can be effectively blocked, and a self-adaptive welding seam tracking mechanism is adopted; the whole protection frame is driven to deflect synchronously through contact friction force between the limiting pad and the workpiece. According to the mechanical tracking mechanism, the position of the baffle can be adjusted in real time without an additional sensor and a control system, so that a protection area accurately covers a welding seam path all the time. And the method is particularly suitable for the common irregular joint situation during dissimilar metal welding.

The invention discloses a method for predicting the mechanical property of a dissimilar metal friction stir lap joint welded joint by fusing physical information, and belongs to the technical field of crossing of material processing and artificial intelligence. The method comprises the following steps that firstly, welding samples under different technological parameters are prepared through experiments, and the mechanical properties of the welding samples are tested; meanwhile, establishing a finite element simulation model, and extracting physical field data such as a temperature field and a stress-strain field; fusing the process parameters and the physical field data to serve as input features, taking the measured mechanical property data as output features, and forming a machine learning training data set; a prediction model is trained by adopting algorithms such as a gradient lifting decision tree and limit gradient lifting; and finally, new process parameters and physical field data obtained through finite element simulation are input, and the mechanical property of the joint can be efficiently and precisely predicted through the model. According to the method, the defects that a traditional trial and error method is high in cost and long in period are overcome, and key technical support is provided for optimization and intelligent design of the dissimilar metal friction stir lap welding process.

The invention relates to the technical field of dissimilar metal connection, in particular to a copper-steel bimetal piece with a complex inner runner and a preparation method thereof.The preparation method comprises the steps that a cooling runner is preprocessed through a copper alloy blank, and a primary copper alloy workpiece is obtained; the primary copper alloy part is cleaned, and a secondary copper alloy part is obtained; the stainless steel blank is subjected to surface treatment and cleaning, and a stainless steel workpiece is obtained; the secondary copper alloy workpiece and the stainless steel workpiece are assembled and then are arranged in a sheath; the sheath is heated and vacuumized and then is sealed and welded; carrying out hot isostatic pressing treatment on the sealed and welded sheath to obtain an intermediate part; and the steel ladle sleeve outside the middle part is removed, and the copper-steel bimetal part is obtained. According to the method, the phenomena of generation of brittle intermetallic compounds on the interface and grain coarsening are avoided, the connection strength is remarkably improved, interface metallurgical bonding and high-precision shape control of a cooling runner are synchronously completed in a single process, and the geometric precision of the copper-steel bimetal part is guaranteed.

The embodiment of the present application provides an aluminum-copper dissimilar metal composite laser welding method and an aluminum-copper welding joint, which relates to the field of laser welding technology. The aluminum-copper dissimilar metal composite laser welding method of the embodiment of the present application includes the following steps: S1, stacking and relatively fixing aluminum metal plates and copper metal plates to obtain parts to be welded; S2, combining blue laser, point infrared laser and ring infrared laser, and focusing them to the welding position on the surface of the parts to be welded to form a composite laser beam; S3, welding the parts to be welded in an oscillating manner by keeping the composite laser beam. The aluminum-copper dissimilar metal composite laser welding method and the aluminum-copper welding joint of the embodiment of the present application can reduce the porosity in the weld and improve the mechanical properties and ductility of the weld.

The invention relates to the technical field of silencer machining, in particular to a production and machining control system and method for an air conditioner silencer, and the method comprises the steps: obtaining an equivalent gap of a joint region, and determining whether the joint gap of a welding region is in a standard interval or not; when the joint gap is in the standard interval, the critical stress of the joint area is estimated according to the joint gap of the welding area and the linear expansion coefficient of the assembly material, and the risk level of the copper pipe in the joint area during high-frequency brazing is determined; when the copper pipe in the joint area is at the first risk level, the welding mode of high-frequency brazing is determined according to the critical stress; after the welding mode of brazing is determined, the welding stage where a weld joint is located is determined according to the temperature rising speed, and a corresponding brazing strategy is adopted; the current fluctuation of the induction coil is detected in the high-frequency brazing process, and the initial current frequency is adjusted back according to the fluctuation duration. The dissimilar metal welding defect rate is reduced by adjusting the welding mode and the brazing strategy of high-frequency brazing.

The invention discloses an aluminum steel welding and material adding method and application thereof, and the aluminum steel welding and material adding method comprises the following steps that S1, aluminum alloy material adding is conducted on a base material steel plate through a friction stirring material adding technology to obtain a plate, and S2, the plate is subjected to graded cooling regulation and control. The IMC thickness is reduced, heat input is reduced, generation of a brittle phase of an aluminum steel dissimilar metal bonding interface is reduced, meanwhile, residual stress is reduced, and the mechanical property and stability of a connector are improved.

The invention discloses an intermediate layer for resistance spot welding of aluminum / steel dissimilar metals and a resistance spot welding method, the intermediate layer is a FeMnCuNi medium-entropy alloy, and the intermediate layer comprises the following components by atomic percent: 20-30% of Fe, 20-30% of Cu, 5-10% of Ni, 5-10% of Ni, and the balance of Fe and inevitable impurities. 20%-30% of Mn; 20%-30% of Cu; the sum of the atomic percentages of all the components is 100%. The method comprises the steps that (1) the aluminum alloy plate and the steel plate serve as welding base materials to be assembled in a lap joint mode, and the middle layer is added to the lap joint area; and (2) through resistance spot welding, a part of the middle layer and the base metal are melted through resistance heat at the lap joint interface, high entropy of nuggets is achieved through atomic diffusion and the high entropy effect, a welding joint with a solid solution as the main part is formed, and the aluminum / steel dissimilar metal composite structure is obtained. Compared with an existing aluminum / steel resistance spot welding technology, high entropy of nuggets is achieved by applying the high entropy effect, generation of brittle-hard phase intermetallic compounds in a welding joint is remarkably reduced, and a high-performance aluminum-steel composite structure is easily obtained.

The invention discloses a dissimilar metal laser arc hybrid welding regulation and control system and method based on multi-source information fusion, and belongs to the technical field of welding monitoring and regulation and control. The dissimilar metal laser arc hybrid welding regulation and control system comprises a welding subsystem (1), a monitoring subsystem (2), a control subsystem (3), an execution subsystem (4) and the like. The multi-dimensional monitoring subsystem is combined with a special data preprocessing mechanism, comprehensive data collection in the dissimilar metal welding process is achieved, the problem that an existing system is single in monitoring dimension is solved, and data support is provided for follow-up defect recognition and parameter regulation and control.

The invention discloses an aluminum alloy and galvanized aluminum magnesium steel CMT dissimilar metal connection method. The method comprises the following steps that S11, a galvanized aluminum magnesium steel plate to be welded and an aluminum alloy plate to be welded are cleaned before welding; s12, laser etching is conducted on the surface of the cleaned zinc-aluminum-magnesium-plated steel plate, a surface microstructure is prepared, and the depth of the surface microstructure is smaller than the thickness of a plating layer on the zinc-aluminum-magnesium-plated steel plate; and S2, the galvanized aluminum magnesium steel plate with the surface microstructure and the cleaned aluminum alloy plate are placed in a lap joint mode, and welding is carried out. According to the method, the surface microstructure is prepared on the surface of the galvanized aluminum-magnesium steel plate, so that the coating restraint degree of the galvanized aluminum-magnesium steel surface is changed, the contact area of brazing filler metal and a base material is remarkably increased, the coating restraint stress of the surface of the base material is reduced, the flowing resistance of a molten pool is reduced, and the wettability is improved; the surface microstructure can promote evaporation of Zn in the coating and reduce the temperature of a molten pool, so that the thickness of an intermetallic compound is reduced, and the performance of a welded joint is remarkably improved.

The invention provides a friction solid-phase additive manufacturing method for improving the bonding strength of dissimilar alloys through interlayer interface texturing. The method comprises the following steps that an aluminum alloy or magnesium alloy plate serves as a base body; depositing a first metal layer on the polished to-be-added area by adopting a friction solid-phase additive process; processing a preset micron-sized three-dimensional texture on the surface of the first metal layer by adopting a laser scanning system so as to form a textured interface, and meanwhile, removing new oxides on the surface of the first metal layer; on the textured interface, a second metal layer which is made of a material different from that of the first metal layer is deposited again through the friction solid-phase additive process, so that a bonding interface which is characterized by micromechanical interlocking is formed between the first metal layer and the second metal layer; layer-by-layer additive manufacturing of a stacked dissimilar alloy having a plurality of dissimilar metal bonding interfaces. According to the method, the interlayer bonding mode of the dissimilar alloy is changed, and the problems of layering and cracking of dissimilar alloy fusion welding additive manufacturing components are effectively solved.

The invention provides an anti-overheating expansion welding method for a tube plate and a heat exchange tube and a tube plate heat exchanger, and relates to the technical field of heat exchanger manufacturing, the method comprises the following steps: planning a welding sequence according to a plurality of to-be-welded tube plate joints on the tube plate, and enabling the continuous tube plate joints on the welding sequence to be non-adjacent in spatial positions; welding is conducted according to the welding sequence, and meanwhile a heat conduction tool is used for making contact with the tube plate connector to conduct heat away; after welding of the preset number of tube plate joints is completed every time, the weld joint temperature is detected and compared with a preset temperature threshold value, and if the weld joint temperature is smaller than or equal to the preset temperature threshold value, welding of the next set of tube plate joints continues; and if the weld joint temperature is larger than the preset temperature threshold value, welding is suspended, and cooling is conducted till the weld joint temperature falls back to be lower than or equal to the preset temperature threshold value. Through a collaborative mechanism of path dispersion, active heat conduction and closed-loop temperature control, the problems of welding seam overheating oxidation, structure deterioration and poor process stability caused by heat conduction difference of dissimilar metals and heat accumulation of batch welding are solved.

The invention relates to the technical field of metal connection, and discloses a welding forming process of an aluminum alloy copper bar and a terminal, which comprises the following steps: sequentially carrying out mechanical cleaning, chemical oil removal and chemical activation pretreatment on the surfaces to be welded of an aluminum alloy base material and a brass terminal; the aluminum-based brazing filler metal foil and the potassium fluoroaluminate scaling powder are sequentially arranged between the aluminum alloy base material and the brass terminal, and an assembly to be welded is assembled; and finally, placing the assembly in hot pressing equipment under vacuum or inert atmosphere protection, carrying out constant-temperature and constant-pressure treatment at the temperature of 600-630 DEG C and under the pressure of 5-15 MPa, cooling, relieving the pressure, and molding. According to the method, a metallurgical bonding transition layer which is compact in structure and free of welding defects is formed at an aluminum-copper dissimilar metal interface under the combined action of liquid-phase filling and solid-phase diffusion, and a prepared welding joint has mechanical shear strength superior to that of an aluminum alloy base material and extremely low interface contact resistance; and reliable connection with high strength and high conductivity is realized.

The invention discloses a high-entropy alloy foil strip and a laser welding method of a titanium alloy and an aluminum alloy, and belongs to the technical field of dissimilar metal laser welding machining, the high-entropy alloy foil strip is used as a dissimilar metal welding middle layer, and the chemical formula of the high-entropy alloy foil strip is TiaFe2aCo2aNi2aCub; wherein a and b both represent atomic proportionality coefficients, b is a continuous adjustable real number parameter in a [1, 3] interval, and 7a + b = 10. The high-entropy alloy foil strip system has uniqueness in element selection, the proportion of Ti, Fe, Co, Ni and Cu is optimized by combining a Miema model and the metallurgical compatibility of base metal, a stable FCC solid solution can be formed in the welding process, the wettability and the structure stability can be improved, and therefore it is ensured that the performance of a welded joint is improved. A high-entropy alloy foil strip middle layer is introduced between two base materials, the high-entropy effect and the hysteresis diffusion effect are utilized, chemical components of a joint are regulated and controlled, generation of brittle Ti-Al intermetallic compounds in a weld joint is restrained, and therefore the mechanical property of the welded joint is improved.

The invention discloses a Ti-Al-Mo-Ta-Cr multi-element interlayer for diffusion welding of titanium-aluminum series dissimilar alloys and application of the Ti-Al-Mo-Ta-Cr multi-element interlayer, and belongs to the field of diffusion welding of dissimilar metals. The middle layer is prepared from the following components in percentage by mass: 68.31 percent to 73.64 percent of Ti, 14.78 percent to 14.90 percent of Mo, 6.50 percent to 6.54 percent of Ta, 4.82 percent to 4.84 percent of Al and 0.13 percent to 5.54 percent of Cr, and the sum of the mass percent of all the components is 100 percent. According to the Ti-Mo-Ta-Al-Cr five-element interlayer alloy disclosed by the invention, the oxidation resistance of a diffusion welding joint can be effectively 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.

The invention belongs to the technical field of dissimilar metal welding, and particularly relates to a laser welding-brazing method for titanium steel dissimilar metal connection. According to the laser welding-brazing method, the laser is adopted as a welding heat source, and laser welding combining brazing and fusion welding is achieved by comprehensively regulating and controlling the filling material, the laser beam position and welding parameters. By the adoption of the welding mode, metallurgical regulation and control of welding seams can be effectively achieved, generation of brittle intermetallic compounds is restrained, a high-quality welding joint with excellent strength and plasticity is obtained, the tensile strength of the welded joint is 317.6 MPa and reaches 82.71% of that of steel base metal and 75.44% of that of titanium base metal, the joint coefficient is 0.83, equal-strength matching is basically achieved, and the welding quality is improved. The welding problem of the titanium steel dissimilar metal is effectively solved, technical support can be provided for matched use of titanium alloy and traditional steel and iron materials, and development of the transportation tool lightweight technology is further promoted.

The invention discloses a titanium-aluminum composite electronic equipment shell and a manufacturing method thereof. The manufacturing method comprises the following steps: manufacturing a titanium alloy frame; manufacturing an aluminum alloy middle plate; the titanium alloy frame and the aluminum alloy middle plate are welded and fixed by adopting a pulse laser welding process to form a titanium / aluminum complex; an in-mold injection molding layer is formed on the titanium / aluminum composite through injection molding; and the electronic equipment shell is formed through CNC machining. According to the electronic equipment shell, functional partition of the inner cavity aluminum alloy and the outer titanium alloy is adopted, compared with a full titanium alloy scheme, the weight and cost of the electronic equipment shell can be reduced, and attenuation of 5G signals can be reduced; the titanium alloy frame and the aluminum alloy middle plate are welded and fixed through the pulse laser welding technology, the connection strength can be improved, and the problem that welding connection of dissimilar metal made of titanium / aluminum materials is not firm is solved. By adopting the mode of injection molding first and then CNC machining on the whole, it can be ensured that all functional characteristics are accurately machined and formed while the in-mold injection molding layer and the metal base body are tightly combined, and mass production is facilitated.

The invention discloses a bimetal thin strip rolling composite interface strengthening method and device based on middle-pass roller roughening. The method comprises the steps that basic parameters of a bimetal thin strip and rolling capacity parameters of a rolling mill are obtained; calculating the limit composite thickness of each pass based on the rolling mill capacity parameters and the basic parameters; based on the limit composite thickness, the number of passes needed by the rolling technology is determined; testing the surface appearance of the composite strip rolled in each pass, and determining the evolution rule of the surface roughness; and based on a surface roughness evolution rule, a texturing roller is adopted for rolling in the middle pass, and a smooth roller is adopted for rolling in the last pass. The texturing roller is introduced into the middle pass, so that the dissimilar metal bonding area is remarkably increased, the interface bonding strength is effectively improved, meanwhile, the deformation resistance difference of dissimilar metal is balanced, the material coordinating deformation capacity is improved, and the phenomena of brittle compound generation and shear stress concentration at the interface are restrained; therefore, the overall performance and quality of the composite thin strip are remarkably improved.

The invention provides a precision casting and friction welding digital manufacturing method for a basic part of an aero-engine, which specifically comprises the following steps of: 1, preparing a blade by adopting a high-temperature alloy material through a precision single crystal casting process; 2, a titanium alloy / high-temperature alloy / carbon fiber composite material is adopted for preparing a blisk / turbine disk; 3, the blades and the blisk / turbine disc are connected through a linear friction welding technology, and connection of homogeneous or heterogeneous metal or nonmetal is achieved; 4, in the linear friction welding process, data of vibration and force-heat multi-frequency key factors are collected, and support is provided for construction of a digital twinborn model; and 5, a digital twinborn model of the linear friction welding process is constructed based on the collected data. According to the method, key factors such as vibration and force heat in the linear friction welding process are collected and reconstructed, the digital twinborn model is constructed, the welding process can be monitored in real time, the welding quality can be predicted, and a basis is provided for welding process optimization and component performance evaluation.

The invention discloses a dissimilar metal sheet welding method for preparing a middle layer based on laser cladding, which is characterized in that a titanium-steel dissimilar metal sheet welding method is improved, temperature field, stress and strain field simulation is combined with a pre-stress method, and substrate deformation in a substrate surface laser cladding process is controlled; in the laser cladding process and the laser welding process, temperature control system equipment is adopted for controlling the temperature field of the substrate, the temperature of the substrate can be effectively controlled within the normal range, the temperature of the substrate cladded with the middle layer can be maintained within the normal range, laser energy can be reduced during welding, and the welding quality is improved. And therefore, deformation in the welding process is controlled, the welding efficiency is improved, and efficient and high-quality welding of the dissimilar metal sheets is achieved.

The invention discloses a near-net forming friction welding method for a dissimilar metal stud based on a middle layer, which comprises the following steps of: pre-processing a similar T-shaped boss with a thread or a circular truncated cone-shaped boss without a thread section on the end surface of a workpiece with high hardness, and pre-processing a corresponding similar T-shaped groove or a circular truncated cone-shaped groove on the end surface of a workpiece with low hardness; and before welding, middle-layer alloy is placed at the upper end and the bottom of the T-like groove or the bottom of the circular-truncated-cone-shaped groove, and the welding steps comprise rotary pressing, rotary pressing and friction, sudden stop and upsetting. The intermediate layer alloy is used as a medium, direct contact friction of a welded workpiece is avoided, surface oxidation films of adjacent base metal are broken and gaps are filled through severe plastic deformation of the intermediate layer under rotary extrusion of the workpiece, and effective welding under the conditions of low upsetting friction pressure and no obvious deformation of the workpiece is achieved. And a dissimilar metal welding interface is prevented from being overheated to generate an overthick intermetallic compound, subsequent machining is omitted, near-net forming of a friction welding joint is achieved, and the production efficiency is improved.

The invention provides a cover plate, a cover plate assembly and a battery cell, and relates to the technical field of batteries. The cover plate comprises a first metal piece and a second metal piece, and the first metal piece and the second metal piece are both annular; wherein the first metal piece is sleeved on the second metal piece, the first metal piece is provided with a first circumferential part close to the second metal piece, the second metal piece is provided with a second circumferential part close to the first metal piece, and the first circumferential part is riveted with the second circumferential part. By riveting the first metal piece and the second metal piece, on the basis of realizing direct connection of dissimilar metals, interlocking in mechanical structure can be formed between the first metal piece and the second metal piece based on plastic deformation for realizing riveting, so that the first metal piece and the second metal piece can be stably connected into a whole; the reliability of connection between the first metal piece and the second metal piece is improved.

The invention provides a titanium-aluminum dissimilar metal connection additive manufacturing method which comprises the following steps: S1, preparing a titanium substrate layer, and manufacturing a titanium alloy space lattice structure on the titanium substrate layer; s2, pouring deposition of the lattice space in the aluminum alloy is carried out in an electric arc welding mode to prepare a titanium-aluminum transition layer; and S3, an electric arc swing mode is adopted, and an aluminum additive layer is prepared on the titanium-aluminum transition layer. The titanium alloy dot matrix transition layer is designed, the characteristic that titanium and aluminum are different in melting point is utilized, arc spot welding filling is adopted, and the risk that titanium and aluminum metal generates a brittle phase under high heat input can be avoided; meanwhile, the connection reliability can be greatly improved by adopting the tenon-and-mortise structure, even if the interface is fractured, the tenon-and-mortise structure effectively hinders the expansion of cracks at the interface, and the connection transition layer still has certain strength.

The invention belongs to the technical field of metal additive manufacturing and metal material connection, and discloses a Ti / Al dissimilar metal integrated additive manufacturing method based on niobium-based interlayer interface structure substitution. According to the method, a niobium intermediate layer is added to the interface of a titanium alloy and an aluminum alloy, a Ti-Nb-Al double interface is formed to replace a Ti-Al single interface in a transition mode, mutual diffusion of Ti and Al is blocked, interface brittle intermetallic compounds TiAl3 and Ti3Al are replaced with an Nb-Ti solid solution, an Nb-Al compound and other Nb-containing compounds, and therefore the problem of interface cracking is effectively solved, and the service life of the interface is prolonged. And the Ti / Al dissimilar metal which is good in interface bonding performance and stable in comprehensive performance is prepared.

The invention discloses a laser hybrid welding device for dissimilar metal connection, and relates to the technical field of laser welding, the laser hybrid welding device comprises a supporting mechanism, the supporting mechanism comprises a welding table and a protective cover, and the top of the welding table is fixedly connected with the bottom of the protective cover; and the clamping and positioning mechanism comprises a first motor. Through the arrangement of the pretreatment mechanism, the cleanliness of the to-be-welded surface is remarkably improved, the dissimilar metal welding quality is guaranteed, a steel wire brush driven by a fourth motor is matched with a first double-shaft displacement assembly, precise and uniform grinding of compact oxide layers on the surfaces of aluminum and copper can be achieved, the local residue problem caused by single mechanical grinding is avoided, and the welding quality of the dissimilar metal is improved. Thorough removal of the oxide layer is ensured; and meanwhile, alcohol is accurately conveyed through the alcohol spraying opening through a conveying pump, machining residual oil stains can be efficiently removed, cleaning dead corners caused by traditional simple wiping are prevented, blocking of molten pool fusion is eliminated through thorough removal of an oxidation layer, and air holes generated by high-temperature decomposition are avoided through efficient cleaning of the oil stains.

The application discloses a brazing method of magnesium / aluminum dissimilar metals, which comprises the following steps: pre-electroplating nickel on a magnesium alloy base material, connecting the prepared magnesium alloy with a nickel plating layer and an aluminum alloy by using an ultrasonic-assisted brazing method, and using a brazing filler metal SAC305. The method prevents the generation of Mg-Sn intermetallic compounds (IMCs) in the process of magnesium / aluminum dissimilar metal low-temperature brazing using a Sn-based brazing filler metal. After welding, the position of the original nickel plating layer is changed into a Cu-Ni solid solution, and no large block-shaped Mg2Sn IMC is found in the brazing seam. Compared with a joint without a plating layer, the shear strength of the magnesium / aluminum dissimilar metal brazing joint based on the nickel plating layer is greatly improved, and the joint strength is strengthened by the diffusion of the nickel element into the brazing seam in the welding process. In addition, the corrosion resistance of the magnesium alloy can be improved by plating nickel on the surface of the magnesium alloy, and the service life of the magnesium / aluminum component is prolonged.