721 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.

The invention relates to the field of image processing, in particular to a copper-aluminum dissimilar metal welding quality detection method based on image processing, and the method comprises the steps: obtaining a gray level image of a welding image of copper-aluminum dissimilar metal, constructing gray level co-occurrence matrixes according to a preset direction, and carrying out the clustering of the gray level co-occurrence matrixes in all directions, and obtaining a plurality of clusters; acquiring positions of pixel points in the gray level image corresponding to each cluster to construct a scatter diagram, acquiring a local area according to a preset radius of the pixel points so as to calculate an outlier index and an abnormal possibility of each pixel point in the scatter diagram, marking the pixel points as abnormal points when the abnormal possibility is greater than an abnormal threshold value, acquiring a connected domain formed by all the abnormal points, and performing clustering on the connected domain; and obtaining an abnormal area in the gray level image, and evaluating the copper-aluminum welding quality of the abnormal area in the welding image. According to the method, the abnormal textures in the welding area can be accurately recognized through construction of the gray-level co-occurrence matrix and clustering analysis, and the detection precision of the welding quality is improved.

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 solid-phase regeneration of a high-homogeneity intermediate alloy from dissimilar metal chips. The method comprises the following steps that firstly, metal elementary substance chips and intermediate alloy chips are subjected to ultrasonic cleaning and drying; step 2, mixing; step 3, crushing processing; step 4, pressing; 5, pulse current assisted vacuum sintering is carried out under the pressurization condition; step 6, performing hot extrusion deformation; step 7, carrying out homogenization treatment; 8, surface oxide skin is removed; and ninthly, machining is conducted, and the granular or scrap-shaped high-homogeneity intermediate alloy is obtained. According to the method, the cost of raw materials for preparing the intermediate alloy is reduced through solid-phase recycling of the metal filing, after the metal filing is crushed and pressed, pulse current is used for assisting vacuum sintering and hot extrusion deformation, local heating and rapid pre-compounding of the filing interface are achieved, an oxidation film is crushed, and the mechanical occlusal force of the filing interface is improved; and the defect healing capacity is improved through the homogenization treatment process, and the solid-phase regenerated high-homogenization intermediate alloy with uniform components is obtained.

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 discloses a zirconium-nickel dissimilar metal welding method based on active regulation and control of a temperature field. The zirconium-nickel dissimilar metal welding method comprises the following steps that S1, base metal is cleaned; the butt-joint end faces and the welding surfaces of the zirconium and nickel alloy pipes are polished and cleaned, and clean zirconium and nickel base materials are obtained; s2, a to-be-welded part is assembled; the to-be-welded end face of the clean base metal is assembled in a protective gas cavity of the rotary clamping device; s3, welding is conducted; a laser scanner is adopted for welding at a preset welding position, heat source gradient distribution of base metal at the two ends of a welding seam is controlled by regulating and controlling laser power, welding seam temperature field feedback is established through an infrared temperature sensor, and real-time monitoring and laser power regulating and controlling are conducted; s4, postweld heat treatment; and the laser power is adjusted in real time according to welding seam temperature field feedback so as to adjust and control the welding seam cooling process. According to the method, effective connection of zirconium-nickel indissolvable metal is achieved by controlling the regional welding temperature field, the temperature range for forming brittle compounds is avoided, the uniformity of a molten pool between Zr and Ni materials is ensured, and welding defects such as hot cracks and air holes are reduced.

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 belongs to the technical field of metal composite material preparation, and relates to an ultrasonic-assisted different-temperature aluminum / magnesium / aluminum three-layer composite plate rolling method which comprises the following steps: pretreating a magnesium plate and two pretreated aluminum strips; heating in an induction coil heating furnace to obtain a heated magnesium plate, and welding and sealing edges to obtain two coiled combined aluminum strips; preparing an aluminum / magnesium / aluminum three-layer plate blank; and ultrasonic waves are applied to the rollers, the aluminum / magnesium / aluminum three-layer plate blank is rolled through the upper roller and the lower roller, and the aluminum / magnesium / aluminum three-layer composite plate is obtained. The magnesium plate is heated through the induction coil, the aluminum strip is not heated, so that different-temperature rolling is achieved between the magnesium plate and the aluminum plate, the plasticity difference caused by performance difference of magnesium and aluminum materials can be reduced, an oxide layer on the surface of to-be-bonded metal is broken by applying ultrasonic waves to the roller, and the bonding quality of the to-be-bonded metal is improved. Therefore, dissimilar metals with large plasticity difference are fully combined, and the defects of holes, cracks and the like of the aluminum / magnesium / aluminum three-layer composite board on a composite interface are avoided.

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 belongs to the field of dissimilar metal laser welding, and particularly relates to a method for improving the adaptability of a dissimilar metal butt joint laser welding-brazing gap through assistance of an alternating magnetic field. After the bottom of the butt joint portion of dissimilar metal test plates with assembly gaps is suspended, a transverse alternating magnetic field and inert gas protection are applied to the lower portion of the butt joint portion, a laser welding head above a sample and a magnetic field generator below the sample are kept static in the welding process, and a laser beam is biased towards the low-melting-point metal side; and the molten low-melting-point material is wetted and spread on the surface of the non-molten high-melting-point material, and then interface metallurgical bonding is carried out to form a melt-brazed joint. The adaptability of dissimilar metal butt joint laser melt-brazing to the assembly gap is improved based on the effect that the transverse alternating magnetic field lifts the molten pool, generation of defects such as aluminum alloy weld side hot cracks caused by increase of the assembly gap is restrained, weld forming is improved, and the adaptability of dissimilar metal butt joint laser melt-brazing in engineering is 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.

To provide a clad material for laser welding which enables downsizing of a joint structure involving joint between dissimilar metals, enables reduction of a space in which the joint structure is disposed, and is suitable for laser welding.SOLUTION: A clad material 1 for laser welding comprises: an Al layer 1a formed of pure aluminum or aluminum alloy; and an Fe layer 1b joined to the Al layer 1a by rolling and formed of iron-based alloy. A thickness of the Al layer 1a ranges from 20 μm to 140 μm. The clad material 1 for laser welding is laser-welded to another member by laser radiation from the Al layer 1a side.SELECTED DRAWING: Figure 2

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.

A copper-aluminum dissimilar metal laser overlap welding method and system, a copper-aluminum dissimilar metal laser overlap welding system, including a fixture, a high-frequency current system, and a laser welding system; a copper-aluminum dissimilar metal laser overlap welding method, including the following steps: step 1, providing an aluminum plate and a copper plate to be welded, and using a fixture to form an upper and lower overlap joint with the aluminum plate to be welded and the copper plate to be welded; step 2, providing a high-frequency current system; step 3, providing a laser welding system; step 4, starting the high-frequency current system, and the high-frequency current system feeds high-frequency current to the aluminum plate to be welded and the copper plate to be welded respectively; step 5, starting the laser welding system, the laser welding system outputs a focused laser beam to irradiate the aluminum plate to be welded, and the laser welding system blows welding shielding gas to the welding area to implement high-frequency current assisted laser welding; step 6, moving the laser welding head to the end point, closing the high-frequency current system and the laser welding system, and completing the welding process.

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.