514 results about "Dissimilar metal" patented technology

The invention relates to the technical field of welding processing, and discloses a dissimilar metal welding joint temperature field optimization control method and system. Real-time temperature field scanning is conducted on the dissimilar metal welded joint, image segmentation processing is conducted on a temperature field image obtained through scanning, temperature data of a weld joint area, a heat affected area and a base metal area are extracted, and whether the temperature gradient exceeds a preset threshold value or not is judged; aiming at an area with non-uniform distribution of heat input quantity, analyzing the performance of the welding joint under the combined action of thermal stress and mechanical stress, obtaining the difference between residual stress distribution and plastic deformation capacity, and analyzing a stress concentration area by combining with the yield strength of the material; and a mapping relation between the welding process parameters and temperature field distribution is established, and a welding process parameter adjustment prediction model is obtained through historical welding process parameters and corresponding temperature field data training in combination with heat flux density distribution. The problems of uneven heat input, stress concentration and the like in dissimilar metal welding are effectively solved, and the welding quality and efficiency are improved.

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.

A method of assembling and installing a vertical cable infill deck railing system is disclosed in which cables are strung two parallel rails, pulled taut, and tightened into position. The cable railing system resists galvanic corrosion by using a flange nut cap to separate dissimilar metals. The flange nut cap also prevents the associated flange nut from falling if it is overly loosened. Galling is reduced without the need for additional coatings by using a phosphor bronze threaded crimp.

The invention discloses a dissimilar metal friction welding interface regulation and control layer and an aluminum steel friction welding method. The dissimilar metal friction welding interface regulation and control layer comprises a micro-texture arranged on the metal surface, paste is laid at the micro-texture, and non-metal substances in the paste are completely volatilized before dissimilar metal metallurgical bonding; the welding method comprises the steps that a microstructure is prepared in a designated area on the surface of a stainless steel plate, Zn-20Al powder and ethyl alcohol are mixed and stirred into paste, then the paste is evenly laid on the microstructure area on the surface of base metal, and then friction stir welding is conducted. A welding joint obtained through the scheme is good in toughness (plasticity) and high in strength, atomic-level tight combination of a joint interface is achieved, the mechanical property of the joint is excellent, the joint is free of air hole and crack defects, the adverse effect of brittle intermetallic compounds on the mechanical property is weakened, the wetting spreading performance and the element diffusion capacity of the interface are enhanced, and the welding quality is improved. The obtained welding joint has a good mechanical embedding characteristic.

The invention belongs to the technical field of welding, and discloses a dissimilar metal power modulation galvanometer laser welding method which comprises the following steps: finely cleaning a 6061 aluminum alloy and a 304 stainless steel plate by using acetone, and then airing for more than 20 minutes; the aluminum steel sheet is assembled, pressed and fixed on a welding test platform in a steel-up-aluminum-down mode; the position of the welding test platform is adjusted, argon serves as welding protection gas, and a protection gas nozzle is arranged to be aligned with a welding pool area; laser welding parameters are set, a laser power modulation mode is set to be a gradient power mode, and the gradient power mode is to regulate and control phase point laser power in a circular scanning track in the advancing direction of a welding seam; a welding test is carried out in the mode that a galvanometer laser head is fixed and a welding test platform is moved, and a laser and the welding test platform are synchronously started and stopped; and the protective gas is started 5 seconds before the laser is started, and after the laser is stopped, the protective gas is stopped lagging for 10 seconds so as to continuously protect the welding seam and prevent oxidation.

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 relates to the technical field of composite material and metal connection, in particular to a carbon / carbon composite material, a modification method and a nickel-based high-temperature alloy brazing method thereof, a SiC coating and a Mo-Si coating are sequentially embedded and sprayed on the carbon / carbon composite material, and a SiC-MoSi composite coating is formed on the surface of the carbon / carbon composite material through high-temperature heat treatment curing. Due to the existence of the SiC-MoSi composite coating, a CTE transition layer is provided for a connector, residual stress caused by thermal expansion difference is reduced, conditions for generating Mo-based compounds are created, wettability and interface bonding strength of brazing filler metal and base metal can be improved, interface reaction of the base metal can be optimized, a uniform and continuous brazing layer is formed, and the service life of the brazing filler metal is prolonged. Therefore, the brazed connection is higher in strength and more stable, and is more suitable for connection of large-size components and service under the high-temperature condition. The problems that in the prior art, the connection performance of a carbon / carbon composite material and dissimilar metal is poor, and failure is prone to occurring are solved.

The invention provides a multilayer heterogeneous material ultrafast laser integrated connection method and device, and the method specifically comprises the steps: stacking and fixing a chip bonding pad, a spring pin and quartz glass on a three-dimensional motion platform, and adjusting the platform to enable a laser focal plane to be located at the center of the pin; aiming at the connection of a bonding pad and a pin, high-repetition-frequency ultrafast laser with a high Rayleigh length is obtained through spatial shaping, a two-dimensional galvanometer is used for carrying out spiral line or concentric circular ring scanning to act on the periphery of the pin, metal plasma is excited, molten metal is formed and deposited in a contact hole of the pin and the bonding pad, and the molten metal is continuously accumulated along with reverse heating, so that the metal is formed. Dissimilar metal welding is achieved; aiming at the connection of the pin and the glass, laser penetrates through the quartz glass, plasma is excited on a metal interface, molten metal with increased volume is formed, a material interface gap is filled, and welding from non-optical contact to optical contact is regulated and controlled; and two heterogeneous materials are successfully welded through single scanning until welding of the whole pin array is completed, and efficient integrated packaging is achieved.

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 provides a method for improving fluidity of weld metal in friction stir welding of dissimilar aluminum alloy, and belongs to the technical field of friction stir welding of dissimilar metal. The method comprises the following steps that 7075 and 6061 aluminum alloy plates are in butt joint and fixed, and friction stir welding is conducted; and the ratio of the length of a stirring needle for friction stir welding to the thickness of the aluminum alloy plate is 0.675-0.725. The metal fluidity and hardness distribution uniformity of a welding joint of dissimilar aluminum alloy friction stir butt welding are influenced by regulating and controlling the needle length of the stirring needle. And when the ratio of the length of the stirring needle to the thickness of the plate is 0.7, the elliptical onion ring formed in the nugget zone of the welding joint is complete in structure, the number of circles is large, and the whole position is moderate, so that the weld metal fluidity of the welding joint is better, and the hardness distribution is more uniform.

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 belongs to the technical field of dissimilar metal additive manufacturing, and particularly relates to a niobium interlayer assisted titanium-aluminum dissimilar metal ultrasonic-laser composite additive manufacturing method. The method comprises the following steps: polishing the surfaces of an aluminum plate and niobium foil to remove an oxidation film; the niobium foil is placed on the surface of the aluminum plate and fixed, and the niobium foil is solidified through an ultrasonic additive manufacturing method; and melting a titanium alloy welding wire on the surface of the niobium foil by using a laser fuse additive method, and carrying out additive layer by layer in the same direction to finally realize effective connection of the titanium alloy wall body and the aluminum alloy substrate. According to the method, the niobium middle layer is prepared through ultrasonic additive manufacturing, and the titanium alloy is added in combination with laser fuse, so that aluminum-titanium dissimilar metal additive manufacturing is achieved, and the formed multi-channel multi-layer additive has good mechanical performance.

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 utility model discloses a dissimilar metal laser welding device with an external magnetic field and a preset gradient coating, which comprises a left lifting system, a right lifting rotating system, a laser welding system, a welding fixture, an electromagnetic field powder mixing electroplating system, an electroplating power supply, a magnetic field power supply, a blowing nozzle, a left upright post, a right upright post and a workbench, according to the electromagnetic field powder mixing electroplating system, a gradient magnetic field is additionally arranged in an electroplating machining area, a middle metal coating distributed in a gradient mode is deposited on the surface of a lower plate test piece, a left lifting system and a right lifting rotating system are matched, and a dissimilar metal upper plate test piece and the lower plate test piece are attached; and the laser welding system is used for carrying out laser lap welding on dissimilar metal materials by utilizing a high-power laser beam. The mechanical property of the dissimilar metal welding seam can be effectively improved, the device is simple in structure and convenient to operate, and the machining quality and the machining efficiency can be improved.

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 provides a dissimilar metal compounding method for rolling separation of a corrugated roller and a flat roller, and relates to the technical field of metal composite plate preparation. The method comprises the steps that firstly, a corrugated roller is used for rolling a base material, and the corrugation morphology is accurately transferred; then pollutants and oxide layers on the surfaces of the corrugated plate and the covering plate are removed; oppositely assembling the corrugated characteristic surface of the base plate and the flat and straight surface of the covering plate after surface treatment to form a to-be-compounded blank; and finally, the composite blank is rolled through a flat roller in a one-pass or multi-pass mode, and the dissimilar metal composite plate is obtained. According to the method, the surface corrugation characteristics of the base material are prefabricated through the roller, flat roller composite rolling is conducted after dissimilar metal assembly, and the phenomena that deformation and impermeability are caused by the thickness and hardness influence of a covering material when the corrugation form is conducted to a composite interface through direct corrugation rolling of the combined blank, and the interface corrugation characteristics are not obvious are avoided; and the interface bonding area and the bonding strength can be obviously increased.

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 discloses a titanium-based interlayer for titanium-aluminum series dissimilar alloy diffusion welding and a preparation method and application of the titanium-based interlayer, and belongs to the field of dissimilar metal diffusion welding. The middle layer is prepared from the following components in percentage by mass: 72.7%-83.1% of Ti, 13.5%-14.8% of Mo and 2.1%-13.8% of Ta, and the sum of the mass percentages of all the components is 100%. According to the method, the oxidation resistance of the diffusion welding head is remarkably improved while the welding quality and precision are guaranteed, high-quality and high-performance diffusion welding of the TiAl / Ti2AlNb composite component is achieved, and the design index and use reliability requirements are met.

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 belongs to but not limited to the technical field of dissimilar metal welding, and discloses a method and system for improving the erosion resistance of a laser cladding cobalt-based alloy coating. Carrying out surface pretreatment on the base material; preparing a cobalt-based alloy cladding layer through a laser cladding technology; and the clad material is subjected to stress relief annealing treatment. Through the key step of annealing treatment after laser cladding of the cobalt-based alloy, generation of micro cracks and defects in a cobalt-based alloy cladding layer is effectively reduced, and therefore the coating which is tightly combined with a base body, excellent in mechanical property and remarkably improved in erosion resistance strength is prepared. The invention further provides an effective solution for solving the problem that cracks are easily generated due to improper heating rate and heat dissipation conditions in the laser cladding process of the cobalt-based alloy, and the quality and reliability of a cladding layer are remarkably improved. The technical innovation is of great significance in promoting high-quality development of the manufacturing industry, especially in the aspect of prolonging the service life of key parts and improving the performance of the key parts.

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 dissimilar metal composite material manufacturing, in particular to a preparation method of a dissimilar metal connecting material for ship engineering, which comprises the following steps: S1, sequentially placing an isolation support plate, a first support block and a base plate on an explosion foundation; s2, sealing along the peripheries of the substrate and the isolation support plate by using a sealing material; s3, a second supporting block of the metal net frame is placed on the surface of the base plate; s4, the compound plate is placed on a second supporting block; s5, explosive is laid on the upper surface of the compound plate; s6, water is injected from a water injection opening; s7, inserting a detonator into the explosive; and S8, detonating the detonator and detonating the explosive to form the explosive welding material. Through the cylindrical mesh-shaped supporting piece and overwater explosive welding, the production length of a product is increased, the shearing performance of a far-end interface is greatly improved, the influence of interface performance of different areas caused by non-uniform basic virtuality and reality is reduced, and the problems of poor long-distance combination and consistency of performance of all the areas of the product in explosive 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.