224 results about "Cold welding" patented technology

The invention discloses an automatic production line control system and method for stamping and welding vehicle body parts, and relates to the technical field of vehicle body part production. The system comprises a welding robot module, an integrated visual detection module, an image processing server, a control PLC, a welding parameter regulator, a defective workpiece processing module, a data tracing cloud platform, a multispectral illumination module, a deep learning acceleration card and a welding spot temperature infrared sensor. On-line full inspection of the welding spot quality is achieved, the omission ratio is extremely low, and the integrated vision module maintains the imaging definition in a splashing environment through a nanometer coated lens and a piezoelectric self-cleaning technology; the multi-spectral lighting module solves the problem of reflective interference of an aluminum vehicle body, the defect recognition accuracy is high, the real-time closed-loop response is fast, the pseudo soldering recurrence rate is low through dynamic current compensation, the pneumatic marking positioning precision is high, accurate coordinates are provided for repair, the system supports high-speed detection of welding spots, and the high-beat requirement of a vehicle body part punching and welding automatic production line is met.

The invention discloses a printed circuit board welding spot three-dimensional shape high-precision analysis method and system, and the method comprises the steps: constructing a high-precision three-dimensional model, and obtaining three-dimensional point cloud data; acquiring feature data of a welding spot region, and judging whether pseudo soldering occurs or not through fusion analysis; the surface roughness and reflectivity loss data of a welding spot area are obtained, the welding spot solidification line density is calculated, the cold welding direction disorder degree is obtained, and the cold welding condition is judged; the minimum distance between adjacent welding spots is obtained, and the bridging condition is detected in combination with conductive path curvature verification and material diffusion characteristics; acquiring the surface texture gradient and reflectivity attenuation data of the welding spot, and performing welding spot oxidation treatment; and performing model training through a convolutional neural network, constructing a welding spot analysis model, and obtaining a welding spot analysis result. The method has the advantages that through high-precision three-dimensional scanning and convolutional neural network deep learning, pseudo soldering, cold welding, bridging and oxidation defects of the welding spots of the printed circuit board are accurately detected and analyzed, and the production efficiency and the product reliability are remarkably improved.

The embodiment of the invention provides a battery welding device, and relates to the technical field of batteries. The fixing assembly is used for limiting the battery on the supporting assembly and driving the battery to rotate; the visual sensor is used for shooting the end face of the battery and outputting a compensation signal according to the end face of the battery; and then the supporting assembly responds to the compensation signal to conduct height adjustment, so that the laser gun head is used for welding the shell and the top cover of the battery after the height adjustment of the supporting assembly is conducted. According to the method, the height compensation process is guided through vision, so that the battery welding focus is kept on the same point, the state consistency of a molten pool can be effectively controlled, the out-of-focus amount fluctuation caused by circle run-out is avoided, the abnormities such as pseudo soldering and weld penetration are avoided, the welding quality is improved, and the safety risk is reduced.

The invention relates to the technical field of chip packaging, in particular to an indium phosphide chip packaging device which comprises a chip clamp, a spot welding head, a hot welding head, a cold welding head, a testing mechanism and a conveying belt, a plurality of supporting frames are sequentially arranged on the outer side of the conveying belt, electric push rods are installed on the supporting frames, and the output ends of the electric push rods are fixedly connected with connecting plates; the conveying belt is arranged to be the chain plate conveying belt, the packaging and positioning mechanism is installed on the fixing block, the packaging and positioning mechanism can position the chip module while conveying the chip module, and meanwhile, when spot welding, hot welding and cold welding packaging are sequentially carried out on indium phosphide chips on the chip module, the chip module can be subjected to spot welding, hot welding and cold welding packaging at the same time; and through mutual cooperation with the press-down cooperation mechanism, the effect of accurately positioning the indium phosphide chip on the chip module during packaging is further realized, the chip module is prevented from deviating from the initial position due to intermittent conveying of the conveyor belt, and the indium phosphide chip packaging efficiency of the chip module is further ensured.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

The invention relates to the field of welding equipment design, in particular to a special-shaped hardware self-adaptive surface welding machine which comprises a machine base and a backflow assembly, a carrying base is fixed to the rear side of the top of the machine base, driving rails are embedded into the two sides of the middle of the carrying base, an electric cylinder A is installed at the top in the carrying base, and a sliding base embedded into the carrying base is rotationally arranged between the front portions of the driving rails on the two sides; a telescopic rod of the electric cylinder A is connected with the upper portion of the sliding seat, a base plate is fixed to the top face of the lower portion of the carrying seat, a folding rod protruding forwards is arranged on the upper portion of the sliding seat, and the folding rod and the base plate are each provided with an electric welding head. The buffer wheel makes contact with the special-shaped surface of the workpiece, the pressed hydraulic rod retracts back to the sleeve, and hydraulic oil is temporarily stored in the backflow box; when the ball valve is closed, a closed cavity is formed, the positions of all the buffer wheels are locked, and full-fitting self-adaptive fixing of irregular contours is achieved. The double electric welding heads (the folding rods and the base plate) are oppositely arranged, vertical synchronous welding is achieved by combining lifting of the sliding base driven by the electric cylinder A, it is ensured that welding force is uniform, and workpiece deformation or insufficient welding is avoided.

The invention belongs to the technical field of welding, and particularly relates to magnesium alloy wire butt welding equipment and a welding method thereof. The equipment comprises a rack, a wire fixing system, an upsetting assembly, a monitoring system, a welding system and an industrial personal computer. Wherein the rack comprises a table board, and baffles and fixing blocks which are arranged on two sides of the table board; the silk thread fixing system comprises a sliding rail, a sliding block, a two-dimensional adjusting table, a movable clamp and a fixed clamp. The two-dimensional adjusting table is used for adjusting the position of the movable clamp relative to the fixed clamp. The upsetting assembly comprises a pressurizer arranged between the baffle and the sliding block and an upsetting adjuster located between the sliding block and the fixing block. The monitoring system comprises at least two electronic magnifiers. The welding system comprises a precise cold welding machine and an arc discharging assembly of the precise cold welding machine. The industrial personal computer is used for displaying observation images obtained by the electronic magnifying lens in real time, adjusting the two-dimensional adjusting table and presetting welding parameters of the precise cold welding machine. The problems that magnesium alloy wires are high in welding difficulty, poor in welding quality, low in welding efficiency and the like are solved.

The invention relates to the field of welding, in particular to a lead welding device for production of a high-voltage silicon stack assembly. In the prior art, the welding operation mostly depends on manual work or a simple mechanism for alignment and clamping, the problems of inaccurate positioning, large assembly deviation, unstable clamping and the like exist, and particularly in the application of high density, small size or complex structure, pseudo soldering, welding deviation or insufficient contact area of a lead body easily occurs. A lead welding device for production of a high-voltage silicon stack assembly comprises a shell. Two covers are rotationally arranged on the shell, two fixing frames are arranged in the shell, and a hopper is installed between the shell and the two fixing frames. A newly aligned movable magnet column is attracted through a fixed magnet column, automatic position correction of the rotating disc, the material pushing block and the lead body is achieved, in combination with limiting cooperation between a clamping groove and a clamping block, the positioning precision and the structural stability can be further improved, the welding attachment effect and the electrical connection strength can be improved, and the consistency and the welding reliability of products are fundamentally improved.

The present invention relates to a novel square battery pack aluminum-palladium welding jig, comprising a jig main body, a first fixed clamping seat and a second fixed clamping seat. Limiting grooves are provided on all four sides of the jig main body, and a first fixed clamping seat and three second fixed clamping seats are respectively installed in the four limiting grooves. A welding groove for limiting the aluminum-palladium position is provided on the jig main body; the jig can effectively prevent short circuits in series connection of battery packs, the first fixed clamping seat and the second fixed clamping seat can effectively limit the relative movement of the battery pack and the jig, the lower surface of the jig is consistent with the positive and negative electrode surfaces of the battery pack, and the movement of the aluminum-palladium is most effectively limited. The jig has high safety performance and good insulation properties. The material can prevent damage to the welded battery pack caused by malfunction of the welding machine. The material is flame retardant, has high efficiency and high fault tolerance, and can effectively prevent the occurrence of cold welding and the like during the welding process.

The utility model relates to a high-density polyethylene (HDPE) plastic steel winding pipe convenient to connect, which aims at solving the technical problems that the connection of the current plastic steel winding pipe needs to consume a large amount of time and energy, and pseudo soldering is easy to occur, and comprises a first pipe body, a second pipe body and a connecting ring, the outer side of the first pipe body is sleeved with a first limiting ring, and the outer side of the second pipe body is sleeved with a second limiting ring. A first limiting ring sleeves the outer side of the first pipe body, a second limiting ring sleeves the outer side of the second pipe body, threaded clamping grooves are formed in the inner sides of the first limiting ring and the second limiting ring, first bolts penetrate through the two sides of one end of the first limiting ring, and first nuts sleeve the outer sides of the two first bolts in a threaded mode; second bolts penetrate through the two sides of one end of the second limiting ring, second nuts are arranged on the outer sides of the two second bolts in a threaded and sleeved mode, the first pipe body and the second pipe body are pulled to move in the opposite directions to be in mutual extrusion butt joint in the connecting ring, and then the connecting efficiency of the HDPE plastic steel winding pipe is improved.

The invention relates to the technical field of cold welding defect identification, and discloses a cold welding defect detection method and system based on multi-source data fusion, and the method comprises the steps: synchronously collecting an acoustic emission signal, infrared thermal imaging data, laser scanning geometric data and embedded mechanical sensing data, carrying out feature extraction, and defining a cold welding feature set; the cold welding feature set is preprocessed, and a normalized cold welding sensitive feature set is generated; calculating a dynamically weighted cold welding risk index based on the cold welding sensitive feature set; according to the cold welding sensitive feature set and a preset defect type feature library, cold welding defect types are output in a classified mode; based on the mapping relation calibrated by the orthogonal test, the cold welding risk index is mapped into three levels of risk levels; and outputting a defect type and risk level report with the three-dimensional space coordinates. According to the invention, double accurate identification of defect types and risk levels can be realized, and auxiliary reference is provided for maintenance strategies.

The invention belongs to the technical field of pipeline welding nondestructive testing, and discloses an ultrasonic phased array detection method and system for welding defects of a polyethylene pipeline hot-melting joint, and the method comprises the following steps: firstly, preparing a welded polyethylene pipeline hot-melting joint and a polyethylene pipeline hot-melting joint containing the welding defects; detecting the polyethylene pipeline hot melting joints at different welding temperatures based on an ultrasonic phased array technology to obtain an ultrasonic phased array detection result; the maximum echo coverage angle range of the tangent plane at different welding temperatures is judged, and the relation between the maximum echo coverage angle range and the welding temperatures is determined; and obtaining an evaluation result of the to-be-evaluated polyethylene pipeline hot-melt joint by combining the relationship between the maximum echo start-end angle difference of the tangent plane and the welding temperature, and determining whether the to-be-evaluated polyethylene pipeline hot-melt joint contains the welding defect or not. According to the method, the welding quality of the polyethylene pipeline hot-melting joint can be more quickly represented by using an ultrasonic phased array detection result, whether the polyethylene pipeline hot-melting joint contains cold welding and over-welding defects or not is judged, the method is convenient and quick, and the cost is reduced.

This invention discloses a grinding device for metal powder processing, relating to the field of metal additive manufacturing powder technology. It includes a collection box with a controller fixedly installed on one side of its outer wall. A grinding cylinder is fixedly connected through the top of the collection box. The inner wall of the grinding cylinder is made of silicon carbide ceramic, and a grinding mechanism is installed inside the grinding cylinder. A spiral feeding mechanism, a gear transmission mechanism, and a cooling mechanism are sequentially arranged outside the grinding cylinder. This invention uses multiple surface-mount temperature sensors to monitor the temperature of different areas of the grinding cylinder in real time. When the temperature rises, a circulating pump starts, and cooling water circulates within a hollow cooling ring, carrying away the grinding heat. Furthermore, a water temperature control component actively cools and stirs the cooling water to ensure a continuously low temperature. This closed-loop temperature control system effectively controls the temperature of the grinding zone, effectively preventing oxidation, phase transformation, or cold welding of the metal powder, thus ensuring the production and forming effect of the metal additive powder.

The application provides a kind of hot vacuum equipment cable storage device, including fixing device, connecting device and storage hook;The fixing device includes first clamping plate and second clamping plate;The connecting device includes ball head mounting seat, ball head clamp seat, ball head adjusting rod;The ball head mounting seat is fixedly arranged on the first clamping plate or second clamping plate;The ball head clamp seat is rotatably connected with the ball head mounting seat;The ball head adjusting rod is connected with the ball head clamp seat at one end, and is connected with the storage hook at the other end.Solve the current hot vacuum environment scene, using ordinary nylon cable ties, metal clamp or plastic wire clamp, resulting in material outgassing pollution optical lens or sensitive device, cold welding and jamming, high and low temperature cycle causes material expansion and contraction, resulting in cable is not firm and angle adjustment difficult, difficult to adapt to complex wiring path;Storage is inconvenient, cable disassembly lacks temporary fixing point, easy to scatter or damaged and other technical problems to be improved.

The invention provides a cold welding and over-welding microwave detection method and device for a PE pipe hot-melt weld, and the method comprises the steps: carrying out the axial microwave scanning of the PE pipe weld meeting the requirements across the weld to obtain a series of reference comparison data, scanning the base metal of the to-be-detected PE pipe weld to obtain the parameters of the base metal, carrying out the circumferential scanning, and carrying out the welding of the to-be-detected PE pipe weld; the method comprises the following steps of: finding out a corresponding suspected point, axially scanning the suspected point to obtain a target data matrix for judging cold welding and over welding, solving a measurement parameter by combining a corresponding algorithm, comparing the measurement parameter with an optimal parameter of a normal PE pipe welding seam, and making a final judgment according to a comparison result. The provided device is used for guaranteeing the detection precision, and the detection method and device can accurately identify cold welding and over-welding defects, can be suitable for PE pipes of different manufacturers and different specifications, and are higher in identification efficiency.

The present application provides a method for preparing gold mud powder and the gold mud powder, and relates to the technical field of preparation of precious metal powder colloids. The present invention uses spherical gold powder as a raw material, firstly mixes the spherical gold powder with the additives polyvinyl alcohol and gelatin for ball milling, washes with deionized water, and dries to obtain flaky gold powder; then the flaky gold powder is evenly mixed with an adhesive and a non-ionic surfactant, and dried to obtain gold mud powder. The present application adds two organic additives to aid grinding during grinding, and the two synergistically adjust the dispersibility of the gold powder in the ball milling liquid, effectively avoiding the cold welding phenomenon caused by the soft texture of the gold powder during the grinding process and the gold powder adhesion and agglomeration phenomenon caused by the viscosity and insufficient lubricity of the ball milling liquid. In addition, the present application reduces the surface tension of the water in the gold slurry by adding a non-ionic surfactant, so that the gold mud powder can be directly applied to the smooth surface of the object after being mixed with water, which not only simplifies the gold brushing process, but also expands the application range of the gold mud powder.

The invention relates to the technical field of metal material processing, in particular to cold spraying composite structure powder with coarse powder coated with fine powder, which comprises the following contents: coarse powder which is a metal coarse powder matrix, and the particle size of the metal coarse powder matrix is 10-80 [mu] m; the fine powder is a fine powder coating layer, and the particle size of the fine powder coating layer is 0.1 nm to 5 [mu] m; the fine powder is jointed on the surface of the coarse powder through a mechanical ball-milling cold welding effect to form a core-shell structure; the coarse powder is selected from Cu, Al, Ti or other alloys. The fine powder coats the coarse powder to form a core-shell structure, so that the problem of powder blockage of equipment caused by direct spraying of the fine powder is avoided; compared with traditional cold spraying single-particle-size powder or mechanical mixed powder with the particle size range of 10-80 micrometers, distribution of a second phase in a sedimentary body prepared from the cold spraying composite-structure powder with the coarse powder coated with the fine powder is finer and more uniform, in addition, a core-shell structure formed by coating the coarse powder with the fine powder provides a high-density heterogeneous interface, HDI stress is remarkably enhanced, and the performance of the cold spraying composite-structure powder is improved. And the prepared sedimentary body has more excellent comprehensive mechanical properties.

The utility model provides a novel curved needle stepping motor, which comprises a casing and a motor output shaft, a winding framework is mounted in the casing, a plurality of curved needles are mounted on the winding framework, one end of each curved needle is bent to form a bent portion, the bent portion is flat, a terminal wire is mounted on the bent portion, and the terminal wire is connected with the motor output shaft. According to the stepping motor, a circuit board does not need to be used, the procedure of welding the terminal wires on the circuit board is omitted, the stepping motor is simpler and more convenient in technology, material and labor cost is saved, the structure is simple, the cost is low, the cost is low, the production efficiency is high, and the production cost is low. In addition, bad conditions such as wrong wire sequence welding, insufficient welding and missing welding are reduced, the wire breaking risk of a finished motor is reduced, the error rate is reduced, the frequency of repairing and scrapping of the stepping motor is reduced, raw material waste is reduced, and the production efficiency of the stepping motor is improved.

Vacuum electron devices (VEDs) are produced having a plurality of two-dimensional layers of various materials that are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together using brazing, diffusion bonding, assisted diffusion bonding, solid state bonding, cold welding, ultrasonic welding, and the like. The manufacturing process enables incorporation of metallic, magnetic, and ceramic materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability. The VEDs so produced include a combination of magnetic and electrostatic lenses for electron beam control.

This utility model relates to the field of copper wire cold welding technology and discloses a multi-directional synchronous pressure device for a copper wire cold welding machine, a welding platform, a welding support arm fixedly installed on one side of the top of the welding platform, and a limiting mechanism provided inside the welding platform; the limiting mechanism includes a sliding bracket, which is slidably connected inside the welding platform, and a hydraulic rod is fixedly installed on one side of the outer wall of the sliding bracket. This utility model, through the design of a moving plate, a fixed frame, a support shaft, a connecting block, a pressure plate, and a limiting ring, achieves a synchronous pressure clamping effect on the copper wire in multiple directions, avoiding rotation or shaking under force, which would affect the accuracy and quality of welding and cause misalignment. At the same time, it can adjust the displacement of the moving plate according to the diameter of the copper wire, so that the pressure plate rotates, which is suitable for pressure fixing copper wires of different diameters, further improving applicability.

This utility model relates to the field of cold welding machine technology, specifically a three-station bimetallic cold forging composite contact automatic welding machine. It mainly includes a support frame, with a protective shell at the top. Feeding components are connected to the left and right sides of the front end of the protective shell. A bottom mold and a wire inlet mold are located at the front of the protective shell, and cutting components are located on both the left and right sides of the front end. A linkage turntable is located on the left rear end of the protective shell, and a transmission gear set is located on the right side of the protective shell. This three-station bimetallic cold forging composite contact automatic welding machine, through the cooperation of a rotation adjustment component, an intermittent lifting component, a moving support component, and a stamping station component, processes the product at multiple stations, resulting in a uniform silver layer distribution and stronger bonding strength. The processing is monitored by an imaging device, and the machine automatically stops immediately upon detecting material shortage, material depletion, overlapping of products, or broken needles, thus preventing further losses.

The present application relates to the technical field of aluminum alloy, and particularly provides a heat treatment free 6N01 aluminum alloy, a preparation method and application thereof, the 6N01 aluminum alloy is an extruded profile obtained by compacting, sintering, extruding and aging treatment of composite powder cold welding particles; the composite powder cold welding particles are obtained by ball milling of composite powder composed of aluminum powder and carbon nanotube and Mg and Si, and the aging treatment refers to transient aging precipitation during the natural cooling process after alloy phase extrusion; wherein, the content of Mg in the composite powder cold welding particles is 0.5-0.7wt%, the content of Si is 0.6-0.7wt%, the content of carbon nanotube is 0.5-1.2vol%, and the content of trace alloying elements is not higher than 0.5wt%. For the 6N01 aluminum alloy long profile with a single length of 26-30 meters for high iron, the present application can greatly shorten the delivery cycle and reduce the cost, and has good practical engineering significance and economic value.

The invention discloses a pump shaft bearing position abrasion repairing method and device, and relates to the technical field of pump shaft repairing. The method comprises the following steps that firstly, a detached pump shaft is fixed; 2, detecting the wear condition: accurately measuring the wear area of the bearing position, generating a detailed three-dimensional surface model, and recording the wear depth and range; 3, surface cleaning; and the abraded surface is cleaned, and rust, old coatings and impurities are removed. By integrating the laser contour scanner, the cold welding machine, the angle grinder, the polishing machine and other devices, high-precision detection, efficient repair and comprehensive inspection of pump shaft bearing position abrasion are achieved. Compared with a traditional method, the method has the advantages that the repairing precision and efficiency are improved, the operation difficulty and cost are reduced, the downtime is shortened, the service life of equipment is remarkably prolonged, the production efficiency of the equipment is remarkably improved, and the method has important economic value and application prospects.

The application discloses a preheating device for glass material circuit board welding and belongs to the technical field of circuit board processing and welding. The preheating device for glass material circuit board welding comprises a workbench and further comprises a rotary table rotatably arranged on the workbench, a motor one fixedly connected to the top of the workbench and used for driving the rotary table to rotate, wherein a preheating bin is formed in the top of the workbench, a first heating wire is fixedly arranged in the preheating bin, and a heat conduction plate is slidably arranged in the preheating bin; a storage rack for placing the circuit board is slidably arranged on the rotary table, a driving part for driving the storage rack to slide is arranged on the rotary table, and the storage rack is matched with the heat conduction plate; the preheating bin is arranged in the welding process to preheat the circuit board, sudden high-temperature bearing of the circuit board can be prevented, thermal expansion and cold contraction are intensified, welding defects such as false welding, cold welding and empty welding are generated at the welding points, the product quality is affected, and the production cost is increased.

The utility model discloses a battery multilayer tab double-sided welding device, which comprises a first welding machine and a second welding machine, the first welding machine comprises a first welding head and a first driving piece, the second welding machine comprises a second welding head and a second driving piece, and the first welding head and the second welding head are oppositely arranged. The first driving piece and the second driving piece synchronously drive the first welding head and the second welding head to move oppositely, and the first welding head and the second welding head are used for welding the two opposite faces of the battery cell tab correspondingly. According to the utility model, the two welding machines are arranged, the two welding machines are provided with the welding heads and the driving pieces which correspond to each other, the battery cell tabs are arranged between the first welding machine and the second welding machine, and the two driving pieces synchronously drive the corresponding welding heads to move oppositely through the collaborative operation of the first welding machine and the second welding machine; the two sides of the battery cell tabs can be welded at the same time, the method can be better suitable for welding the tabs with large thickness and connecting pieces after multiple layers of tabs are stacked, and pseudo soldering of the multiple layers of tabs and the connecting pieces is avoided.

The present invention discloses a laser welding device for assembling an energy storage power supply, which relates to the field of power supply assembly and includes a welding mechanism, wherein the welding mechanism includes a mounting plate, the lower end of the mounting plate is rotatably connected to a rotating shaft, the lower end of the rotating shaft is fixedly connected to a connecting column, a second electric slide is installed on the left side of the connecting column, and a laser welding head is installed on the slide rail seat of the second electric slide; a moving mechanism, wherein the moving mechanism is used to move the mounting plate up and down, the moving mechanism includes a first electric slide, a connecting frame is installed on the front side of the first electric slide, and the front side of the connecting frame is fixedly connected to the rear side of the mounting plate; and a rotating mechanism. During use, the welding device can reduce the possibility of cold welding, and after each welding is completed, a welding tightness test can be performed to minimize quality problems caused by cold welding. In addition, the fume generated during the welding process can be removed.

The present invention proposes a current collecting plate, a battery cover plate assembly, a cylindrical battery and an assembly process, wherein a plurality of through holes are provided on the current collecting plate, and the through holes are arranged at equal intervals around the axis of the current collecting plate, and the through holes are used for the pole lugs at the ends of the winding core in the axial direction to pass through and fall toward the side of the current collecting plate away from the winding core. Compared with the traditional penetration welding, the present invention can intuitively and controllably implement the welding of the pole lugs on the surface of the current collecting plate. On the one hand, the welding quality can be intuitively detected to avoid the occurrence of cold welding and leaking welding. On the other hand, the welding of the pole lugs and the current collecting plate can be achieved by using a laser with a lower intensity, avoiding the phenomenon of pole lug breakdown caused by excessively strong penetration welding in the traditional method, and greatly improving the welding yield of the current collecting plate and the pole lugs.

The present invention discloses a ball-milling layer-by-layer adhesion coating method for a gradient coating on the surface of a wheel hub. The aluminum alloy wheel hub is fixed in a ball-milling tank, and mixed powders of AlxFeNiSiTi high-entropy alloy + 6061 aluminum alloy with different volume fraction ratios are sequentially added in the ball-milling tank at different time periods. The stainless steel tank is tightly sealed and evacuated, and high-purity argon gas is introduced. The mixed powders are gradually mixed evenly under the impact between the stainless steel tank and the stainless steel grinding balls. During the ball-milling process, the mixed powders undergo cold welding under the impact between the stainless steel grinding balls and the surface of the wheel hub, and are adhered layer by layer on the surface of the aluminum alloy wheel hub, forming a gradient composite surface layer with different volume ratios of AlxFeNiSiTi high-entropy alloy + 6061 aluminum alloy on the surface of the aluminum alloy wheel hub. During this process, ultrasonic vibration is used to assist the high-frequency impact of the stainless steel balls on the surface of the coating to eliminate the pores in the coating, and deposition is carried out layer by layer in this way. Finally, diffusion sintering is carried out at an appropriate temperature, and the sintered coating is more dense, with good bonding of the particles and good bonding with the surface of the wheel hub.

The invention provides flaky zinc powder suitable for a water-based zinc-rich coating and a preparation method of the flaky zinc powder, and the preparation method comprises the following steps: preparing spherical fine zinc powder of which the particle size is less than or equal to 74 microns; mixing the spherical fine zinc powder, an auxiliary agent A and an auxiliary agent B, putting the mixture into a roller ball mill, and performing ball milling in a protective gas atmosphere to obtain flaky powder; the sum of the mass of the assistant A and the assistant B is 1-3% of the mass of the spherical fine zinc powder; in a protective gas atmosphere, continuously polishing and shaping the flaky powder obtained in the step S2 in the roller ball mill, and discharging; the rotating speed of the roller ball mill in the step is not greater than that of the ball mill in the step S2. According to the technical scheme, the obtained flaky zinc powder is good in powder flowability and dispersity and less in cold welding, and a prepared coating is easy to disperse and not prone to precipitation; the powder is good in flaking and smooth in surface, and the product is not oxidized and does not generate heat even if being completely exposed in the air.

The application discloses a method of liquid cold welding (LCW) including: (a) engaging two or more porous conductive substrate layers between perforated non-conductive frames so that the substrate layers contact one another; (b) immersing the substrate layers in an electrolyte solution; and (c) applying electric current and / or voltage and / or electric power to the electrolyte solution. Apparatus suitable for performance of some embodiments of the method are also disclosed.