64 results about "Undermatching" patented technology

The invention belongs to the technical field of steelmaking production scheduling, and provides a steelmaking production scheduling method and system based on digital twinning and a medium. According to the method, a continuous casting billet digital twin body is constructed, dynamic coupling analysis is conducted on cutting action and roller way conveying, and the matching performance of cutting and hot charging rhythms is judged; aiming at the mismatching condition, calculating the backlog driving force by utilizing a car-following model, and activating a dynamic buffer area in combination with a state intensity-spatial distance model; the casting blank temperature drop rate is corrected based on the heat transfer theory and the thermal radiation physical field model, and the hot charging fitness is evaluated; and establishing a space-time constraint scheduling model, and dynamically optimizing casting blank generation scheduling. The system comprises a matching identification module, a buffer establishment module, a hot charging analysis module, an adaptation analysis module and a rhythm adjustment module. According to the scheme, the continuous casting billet cutting is matched with the hot charging rhythm, and the hot charging fitness and the production efficiency are improved.

The invention relates to the technical field of steel structure construction, and particularly discloses a large steel structure truss lifting and sliding system which comprises eight specific implementation processes, a steel structure lifting device and a steel structure sliding device are adopted, and through the core design of overall lifting of a steel structure truss and high-altitude sliding conversion of the steel structure truss, the large steel structure truss can be lifted. The problem of support mismatching in the prior art is solved. The method is mainly suitable for complex engineering scenes such as large-span steel structure venues and high-speed rail stations.

The invention discloses a welding machining method, device and equipment and a storage medium, and relates to the technical field of welding machining.The welding machining method comprises the steps that the size deviation type of a current workpiece to be welded is obtained; wherein the size deviation type comprises at least one of gap deviation, hole position deviation and assembly dislocation deviation; the size deviation value of the current to-be-welded workpiece is determined according to the size deviation type; determining a power compensation value mapped by the size deviation value based on a preset mapping relation; determining an actual power value according to a preset power value and the power compensation value; and when the current workpiece to be welded is welded, the actual power value is applied. By means of the mode, the welding power can be matched with the specific size deviation of the workpiece in real time, the quality problems of overburning, insufficient fusion depth and the like caused by parameter mismatching are avoided, and the stability and consistency of the welding bead quality are improved.

The present application belongs to the technical field of steelmaking production scheduling, and provides a steelmaking production scheduling method and system based on digital twinning and a medium. The method dynamically couples and analyzes cutting action and roller conveying by constructing a continuous casting billet digital twin, judges the matching of cutting and hot charging rhythm, calculates the backlog driving force by using a car-following model for the mismatching case, activates a dynamic buffer zone in combination with a state intensity-space distance model, corrects the casting billet temperature drop rate based on a heat transfer and thermal radiation physical field model, evaluates the hot charging adaptability, establishes a time-space constraint scheduling model, and dynamically optimizes the continuous casting billet generation scheduling. The system comprises a matching identification module, a buffer establishment module, a hot charging analysis module, an adaptability analysis module, and a rhythm adjustment module. The scheme realizes the matching of continuous casting billet cutting and hot charging rhythm, and improves the hot charging adaptability and production efficiency.

The laser filler wire welding in-situ self-learning closed-loop control method for the Fe-Cr-A1 special-shaped component comprises the steps that information of a component to be welded and weld joint characteristics are obtained, and an initial welding program is generated; a multiband composite laser is adopted for welding, meanwhile, welding seam characteristics are monitored, and the wire feeding speed is adjusted in real time; spectral signals and weld pool visual image signals in the welding process are synchronously collected in real time, the current welding defect probability is obtained, and the welding speed is adjusted in real time; and the total laser power is adjusted in real time according to the real-time molten pool temperature and the laser incident angle. The method can effectively solve the problems that the welding track of the special-shaped component is difficult to manually program, welding deformation causes a welding seam gap, and the wire feeding speed is not matched with preset welding process parameters.

A repair welding segment detection method includes generating, based on a result of the inspection determination, shape mismatch data obtained by extracting a shape mismatch portion of the weld bead, dividing the shape mismatch data into N, where N is an integer of 2 or more, equally divided windows in a direction perpendicular to a welding direction of the weld bead, setting a shift region formed by i, where i: an integer of 1 or more, continuous windows among the N windows, separately calculating volumes of (N−i+1) shift regions obtained by shifting one by one the i windows forming the shift region in the welding direction, and determining that a shift region having a volume of a predetermined value or more among the calculated volumes of the (N−i+1) respective shift regions is a defective segment of the weld bead.

A grouting metal corrugated pipe with key teeth for steel bar anchoring comprises a corrugated pipe body and the key teeth located at wave troughs of the outer wall of the corrugated pipe body. The bottom of the corrugated pipe main body is closed, the top of the corrugated pipe main body is open, the opening is used for inserting a reinforcing steel bar extending from an adjacent connecting component, and the reinforcing steel bar inserted into the opening and the corrugated pipe main body form reliable anchoring through a grouting material; the key teeth are in a semi-conical shape, a double-semi-conical shape or a semi-cylindrical shape; the key teeth and the corrugated pipe main body are connected together through integral casting processing, welding or a connecting piece; when the corrugated pipe structure with the key teeth is used for grouting corrugated pipe connection, the bonding and anchoring performance of the corrugated pipe and common concrete can be improved, the problem of stress concentration is effectively solved, the anchoring length of the corrugated pipe is reduced, and the problem that when high-performance grouting materials are used, the service life of the corrugated pipe is prolonged is solved. And in addition, the structure and the method are simple in process, and the arrangement position is flexible.

The application relates to the technical field of electric arc welding, in particular to a welding device for trolley part machining, which comprises a welding table and a supporting column fixedly installed on the top of the welding table, an active seat is arranged above the supporting column, an elastic unit matched with the active seat is installed on the supporting column, an electric arc welding gun is penetrated through the active seat, a locking piece matched with the active seat is installed on the electric arc welding gun, a synchronous frame used for contacting the end of a contrast group pipe is arranged above the supporting column, the movement of the electric arc welding gun is not controlled by a preset program, but is directly driven by the solid outline of the contrast group pipe through a mechanical mechanism, the risk that the programmed track does not match the actual workpiece is completely avoided, the real-time accurate coincidence of the welding track of the electric arc welding gun and the joint of the workpiece is guaranteed, so that the heating center of the electric arc does not deviate from the joint, and the heat can uniformly act on the two side pipe fittings.

The invention relates to the technical field of solder, in particular to a solder composition and a preparation method and application thereof, and the solder composition comprises a first alloy and a second alloy; the first alloy comprises the following components in percentage by weight: 65-78% of Sn, 18-30% of In and 2-5% of Ag; and the second alloy comprises the following components in percentage by weight: 94-97% of Sn, 2-7% of Ag and the balance of Cu. The solder composition has double melting behaviors before reflow and has high solidus temperature after reflow, so that the problem of hot cracking caused by mismatching of coefficient of thermal expansion (CTE) among a substrate, a package and a welding spot is solved, and the solder composition is suitable for high-reliability electronic packages including BGA, CSP and flip chip assemblies.

The application discloses a welding material for preparing a copper-stainless steel gradient structure, which comprises a welding material for preparing a near-stainless steel transition layer and a welding material for preparing a near-copper transition layer; the material is specially used for solving the forming difference and the steel-side penetration cracking problem caused by the thermal physical property mismatch during the connection of the copper-steel dissimilar structures. The application further discloses a CMT preparation method for the copper-stainless steel gradient structure by using the welding material for preparing the copper-stainless steel gradient structure.

The invention discloses an assembly method for preventing thermal mismatch of a device. The assembly method comprises the following steps: carrying out modification treatment on the surface of a welding surface of the device; carrying out modification treatment on the surface of the printed board bonding pad; performing solder paste printing processing on a central bonding pad and a target pin bonding pad of the printed board; correspondingly placing the welding surface of the device and a printed board bonding pad, and realizing interconnection between the device and the printed board through reflow soldering; welding the residual pins of the device and the residual bonding pads of the printed board to complete fixation of the residual pins of the device and the residual bonding pads of the printed board; and reinforcing the part between the device and the printed board. Through modification treatment, rasterization steel mesh printing, step-by-step welding and corner reinforcing design on the surface of the device and a printed board bonding pad, stress concentration caused by mismatching of thermal expansion coefficients of the device and the printed board can be effectively relieved, welding spot cracks and failure risks are reduced, and therefore the installation reliability of the device in the long-term application process is improved.

The utility model relates to a substrate and a PCBA board. The substrate is provided with a plurality of bonding pad parts, the bonding pad parts are arranged around a preset central area at intervals, and each bonding pad part sequentially comprises a first bonding pad section, a second bonding pad section and a third bonding pad section; the first bonding pad section and the second bonding pad section of each bonding pad part are used for adaptively welding a first adapter, and the second bonding pad section and the third bonding pad section of each bonding pad part are used for adaptively welding a second adapter. Therefore, the first bonding pad section and the second bonding pad section of each bonding pad part are combined to form a first composite bonding pad with a smaller size, so as to adapt to a first adapter with a smaller welding size; and the second bonding pad section and the third bonding pad section of each bonding pad part are combined to form a second composite bonding pad with a larger size so as to be adaptive to a second adaptive part with a larger welding size, so that the risks of defects such as component pulling deviation, difficulty in controlling the height of the welding flux, missing soldering or false soldering and the like caused by mismatching of the size of the bonding pad and the amount of the welding flux are greatly reduced, the welding quality is greatly improved, and the production cost is reduced. And the process requirements can be better met.

This invention discloses a real-time detection method and system for steel slag flow based on a triaxial accelerometer, belonging to the field of steel metallurgical process detection technology. It acquires triaxial vibration data to fully capture the impact energy of steel slag in any direction in three-dimensional space, overcoming the signal loss problem caused by the mismatch between the installation direction and the impact direction of traditional single-axis sensors. Based on this, a dynamic threshold pre-screening mechanism is adopted, requiring only the calculation of a few core features to quickly determine the slag-free state. For suspected slag-containing periods, a CNN-LSTM hybrid model is further used for fine identification. The model automatically extracts the nonlinear combinations and temporal dependencies between feature dimensions, achieving accurate classification of four states: initial flow, stable slag flow, and impact of large slag pieces. This invention integrates comprehensive perception, efficient prediction, and intelligent identification, providing a safe, reliable, and low-cost online detection and classification control solution for steel slag flow in the steelmaking process.

The invention discloses an optimization method for welding equipment and a process of a steel annealing and pickling production line. The optimization method comprises the following steps: S1, adopting pure Ar gas as welding shielding gas; s2, replacing a large-diameter protective nozzle; s3, a gas screen is additionally arranged at a protective gas outlet of the welding gun, and a protective net is additionally arranged in the gas screen; s4, the push-pull type wire feeding mechanism is replaced; s5, process parameters of welding equipment are adjusted; and S6, the steel is connected with the titanium material, so that the special connecting band is formed. By improving the welding equipment and optimizing the welding process, the problems of titanium material MIG welding air suction brittle failure, unsmooth wire feeding, parameter mismatching, dissimilar material connection failure and the like are solved, it is ensured that the welding seam quality meets the subsequent annealing and pickling procedure requirement, the welding efficiency adapts to the continuous operation rhythm of a production line, and it is ensured that titanium materials can be produced in batches.

According to the preparation method of the 2.5 D packaging structure provided by the invention, in the process of preparing the 2.5 D packaging structure, the large-size substrate is directly and electrically connected with the rewiring layer, so that compared with a traditional technological process of packaging first and then carrying out substrate mounting, the warping problem of a high-performance and large-size chip packaging structure can be effectively solved, and the reliability of the packaging structure is improved. The problem of pseudo soldering caused by mismatching of thermal expansion coefficients is avoided; according to the preparation method of the 2.5 D packaging structure, the three supporting substrates are respectively and simultaneously subjected to process operation and then combined through bonding, so that the electrical connection quality can be improved, the process time can be effectively shortened, the process yield can be improved, and the thermal stress accumulation problem of the process structure can be improved.

The present application belongs to the technical field of combustion chamber flame tube structure, and particularly relates to a non-metallic composite material combustion chamber flame tube based on elastic connecting structure, which adopts various elastic connecting structures between the inner and outer rings of the non-metallic composite material flame tube and the head ring of the metal material flame tube, changes the thermal matching deformation into elastic matching, has good thermal expansion matching performance, good sealing performance and assembly performance, can maintain good sealing performance under hot state, and effectively reduces the flame tube air leakage problem caused by the mismatch of thermal expansion amount. The elastic connecting structure of the inner and outer rings of the flame tube can effectively disperse the axial and circumferential stress, reduce the stress concentration of the non-metallic composite material, reduce the risk of damage caused by uneven stress of the matrix, and increase the service life of the non-metallic material flame tube. Meanwhile, the present application also has split structure design, which can effectively improve the maintainability of the flame tube, reduce the maintenance cost, and has high engineering application value.

This invention relates to the field of box welding technology, specifically to an explosion-proof control box welding equipment, including a base and a robotic arm, wire feeding module, clamping module, and wire cleaning and cutting module mounted on the base. The robotic arm has a support plate with a fixed pipe fixed to it. Each end of the fixed pipe has a positioning mechanism for clamping the welding wire. A bidirectional lead screw is rotatably mounted on one side of the support plate, and two movable blocks symmetrically connected to the lead screw are threaded onto it. Clamping force is provided by a cylindrical spring, and the compression of the spring automatically matches the thickness of the welding wire. This avoids the problem of mismatch between the welding wire thickness and the clamping force, preventing thinner welding wires from developing indentations, scratches, or even plastic deformation due to excessive clamping force, and preventing thicker welding wires from slipping or experiencing wire feeding speed fluctuations due to insufficient clamping force, thus ensuring welding effect and final product quality.

The invention provides a method for ceramic-steel efficient diffusion bonding and synchronous preparation of metal-based ceramic, and belongs to the technical field of welding. The method comprises the following steps that Al powder, Ti powder and B2O3 powder are mixed and then subjected to ball milling, and intermediate layer powder is obtained; mixing ceramic powder, a binder and an active component, and performing secondary ball milling to obtain a metal-based ceramic precursor; and sequentially assembling a base material, the intermediate powder and the metal-based ceramic precursor from bottom to top into a layered structure to obtain an assembly, and sequentially carrying out cold pressing pretreatment, hot pressing diffusion bonding and cooling on the assembly to obtain the metal-based ceramic. Smooth transition of thermal expansion coefficients is achieved through the middle transition layer, residual stress caused by mismatching of the thermal expansion coefficients of ceramic and steel is effectively restrained in cooperation with an optimized control cooling system, and long-term service reliability of the connector under the thermal cycle condition is guaranteed.

According to the 2.5 D packaging structure and the preparation method thereof provided by the invention, in the process of preparing the 2.5 D packaging structure, the large-size substrate is directly and electrically connected with the rewiring layer, so that compared with a traditional technological process of packaging first and then carrying out substrate mounting, the warping problem of a high-performance and large-size chip packaging structure can be effectively solved, and the reliability of the packaging structure is improved. The problem of pseudo soldering caused by mismatching of thermal expansion coefficients is avoided; according to the 2.5 D packaging structure and the preparation method thereof, the two supporting substrates are respectively and simultaneously subjected to process operation, and then are combined through bonding, so that the electrical connection quality can be improved, the process time can be effectively shortened, the process yield can be improved, and the thermal stress accumulation problem of the process structure can be improved.

A laser welding device and method for a cross-shaped spiral core filling rod and a cross-shaped end plug aim at achieving reliable connection of a special-shaped thin-wall cladding and the end plug, and the device comprises a welding clamp, a front tool, a stepped cross-shaped front end plug, a cross-shaped spiral simulation fuel rod, a stepped cross-shaped rear end plug and a rear tool. The rear end of the cross-shaped spiral simulation fuel rod is connected with the rear tool through a stepped cross-shaped rear end plug; the front end of the cross-shaped spiral simulation fuel rod is connected with the rear end of the stepped cross-shaped front end plug, and the front end of the stepped cross-shaped front end plug is connected with the welding clamp through the front tool. The welding method adopts step-by-step spot welding: firstly fixing the front end plug, and rotating a welding clamp to perform spot welding for four times; the same process is repeated for rear end plug welding; according to the method, the welding seam with narrow welding seam, high surplus height and good air tightness can be formed on the thin-walled tube, the phenomenon that the thin-walled tube is easy to burn through during welding due to mismatching of assembly gaps and non-uniform solder accumulation in the welding process is avoided, and poor tightness and overlarge spacing of the welding seam in the welding process are prevented.

The utility model discloses an automatic ring welding machine for a fire extinguisher cylinder, and belongs to the technical field of fire extinguisher cylinder production. Comprising a rack and a mounting table, and the rack is fixedly connected with the side face of the mounting table. The lower portion of the machine frame is connected with a barrel feeding device for fixing the direction of a barrel, the upper end of the machine frame is connected with a first sliding rail, and the first sliding rail is connected with a lifting device for driving the barrel to ascend in a sliding mode. The upper end of the rack is connected with a first electric cylinder, and an output shaft of the first electric cylinder is fixedly connected with the side face of the lifting device. The two sides of the rack are connected with an upper bottom conveying line and an M bottom conveying line, the two sides of the mounting table are connected with rotary feeding mechanisms, and the lower end of the rack is connected with an assembly feeding device. Clamping devices are connected to the two sides of the upper portion of the mounting table, and a welding gun is connected to one side of the mounting table. The problems that a feeding mechanism in the prior art is not matched, and production efficiency is low and errors are increased due to redundant steps in the prior art are solved.

The invention relates to the technical field of wear-resistant pipelines, and discloses a bimetal double-layer ceramic lining mitre elbow and a manufacturing method thereof. The manufacturing method comprises the following specific steps: 1, rolling a steel plate mesh with rhombic holes, honeycomb hexagonal holes and the like into a barrel shape, and spot-welding the steel plate mesh on the inner surface of a straight steel pipe; 2, coating an alloy coating and a first ceramic coating through a centrifugal self-propagating process; 3, a mitre elbow structure is formed through cutting and welding; 4, coating a second layer of ceramic by adopting a static self-propagating process; and 5, processing a joint welded with the straight pipe to form a transition slope. In the process, ceramic coating gaps in the pipe generated by tailor welding are filled with static self-propagating reaction products. The total thickness of the ceramic layer of the elbow is 2-3.0 times that of a straight pipe, and the inner surface roughness Ra is smaller than or equal to 1.6 microns. The problem that the service life of an elbow is not matched with that of a straight pipe is effectively solved, the abrasion resistance is improved by 3.2-3.8 times, the impact strength is improved to 42 J / cm < 2 >, the equal-life design of a pipeline system can be achieved, and the cost of the whole cycle is reduced by 52% or above.

The invention relates to the technical field of water conservancy projects, and discloses a steel sheet pile connecting structure and an ecological revetment. According to the steel sheet pile connecting structure, the thickening layer of the plain concrete cushion layer is arranged at the connecting position of the steel sheet pile and the bearing platform, and the exposed metal area formed in the welding process is completely wrapped inside, so that the exposed metal area formed due to high-temperature damage in the welding process is not directly exposed to seawater or a high-corrosion environment; corrosion media (water, chloride ions and oxygen) are prevented from being in contact with the metal surface, invasion of the corrosion media is avoided, and a corrosion starting point is eliminated. Meanwhile, according to the structural design, post-welding supplementary coating treatment is not needed, the construction cost is remarkably reduced, the construction period is remarkably shortened, the problem of secondary corrosion prevention failure caused by mismatching of adhesive force and durability in a traditional supplementary coating process is solved, and continuity and integrity of the corrosion prevention performance of the connecting part are ensured.

This invention discloses a post-weld heat treatment process to improve the strength and toughness of welded joints made of 1600MPa grade ultra-high strength steel. The core technology utilizes a composite heat treatment of "precision quenching + low-temperature tempering" to solve the problem of strength-toughness mismatch caused by elemental segregation and uneven microstructure in the welded joint. The process involves oil quenching at 840-850℃ for 5.4-5.8 hours, followed by oil cooling at 200-220℃ for 7.4-7.8 hours. This effectively reduces the segregation of Cr, Mo, W, and Si elements, transforming the weld microstructure from martensite to tempered martensite and precipitating uniform carbides. After treatment with this invention, the tensile strength of both the base metal and the weld joint is ≥1740MPa, the impact energy of the weld joint is increased to over 34J, the impact energy of the base metal reaches over 69J, and the uniformity of hardness distribution is improved by 40%. This process is suitable for welded components made of 1600MPa grade ultra-high strength steel in the automotive, aerospace, and other fields, significantly improving service safety and lifespan.

The application belongs to the field of civil engineering and specifically relates to a negative Poisson's ratio composite steel plate shear wall, which comprises a negative Poisson's ratio component and an edge component; the negative Poisson's ratio component comprises a sandwich layer arranged in the middle and outer steel plates arranged on both sides of the sandwich layer respectively; the outer steel plates are connected with the edge component, the sandwich layer is arranged inside the edge component, and the sandwich layer is connected with the outer steel plates; the outer steel plates and the sandwich layer both have a negative Poisson's ratio configuration. Compared with the prior art, the application solves the defect that the blast resistance and the seismic resistance of the steel plate shear wall do not match in the prior art, optimizes and improves the steel plate shear wall, a typical steel structure component, based on the design concept of the negative Poisson's ratio metamaterial, and provides a new type of negative Poisson's ratio composite steel plate shear wall, which realizes the seismic resistance and the blast resistance of the SPSW and basically realizes the goal of overall coordination of the structural performance requirements under the actions of two disasters.

The invention relates to the field of ceramic materials, and discloses a ceramic-metal material composite brazing method with an in-situ synthesis reaction, which comprises the following steps: pretreating a ceramic surface and a metal surface to be welded; brazing filler metal is preset between the welding faces of the to-be-welded ceramic and the to-be-welded metal, and the brazing filler metal is AgCuTi welding flux added with amorphous boron powder; in the vacuum brazing process, the Ti element and boron powder are subjected to an in-situ reaction, and a TiB ceramic reinforced phase is generated. The technical problem of joint cracking caused by low interface bonding strength and mismatched thermal expansion coefficients in traditional ceramic-metal connection is solved. According to the method, the mixed powder intermediate layer containing the active elements is preset on the to-be-connected interface of the ceramic and the metal, the intermediate layer is induced to be subjected to the in-situ chemical reaction through heating, the composite reaction product with high strength and gradient thermal expansion performance is generated, and metallurgical bonding and stress buffering integration of the ceramic and the metal is achieved; the mechanical property and the service stability of the joint are obviously improved.

The application discloses a production process optimization method and system for a photovoltaic module, and relates to the technical field of photovoltaic production. The method comprises the following steps: front welding is performed on a target photovoltaic module, an infrared thermal image is used to monitor the thermal distribution of a welding head and a welding seam area, and a welding seam peak temperature distribution is obtained by analysis; the weldability of a plurality of tail ends after front welding is identified according to a preset index, and a tail end weldability distribution is obtained; based on the welding seam peak temperature distribution and the tail end weldability distribution, back stringing is positioned, compensated and matched with a secondary reflow heat curve, and a back stringing process optimization scheme is formed; and the back stringing is completed according to the scheme. The technical problems of unstable back stringing quality and electrical performance loss caused by the mismatch of front welding and back stringing process parameters are solved, the technical effect of realizing accurate positioning and heat process matching of back stringing through the data linkage of welding heat distribution and tail end weldability is achieved, and the stringing quality and the component yield are improved.

The invention relates to the field of GTAW welding, in particular to an aluminum alloy GTAW imitation welder welding speed control system and method based on multiple perception. The aluminum alloy GTAW imitation welder welding speed control system and method based on multiple perceptions are provided for solving the problems that the welding seam forming quality is unstable and adjustment depends on artificial experience due to the fact that the welding speed is not matched with the dynamically-changing welding state. A GTAW robot is used for welding; a visual sensor is used for shooting molten pool boundary and molten pool rear images; capturing the three-dimensional shape of the molten pool by using a three-line structure light sensor; beveled edge width information is obtained in real time through a single-line structured light sensor; detecting arc sound by using a sound sensor; and the industrial personal computer analyzes and processes the obtained data. On the basis of accurate analysis of dynamic characteristics of the molten pool, control over welding seam quality forming is finally achieved.

The application discloses a material for butt welding of aluminum-steel composite plates, which comprises welding materials for near-aluminum layers and near-steel layers; the welding material for the near-aluminum layer is a near-aluminum layer welding wire, which comprises a core and a sheath, wherein the core is composed of the following components in percentage by mass: Zn powder 40-50%, Sn powder 20-25%, Ti powder 5-10%, Mg powder 5-10%, Re powder 1-3%, and the rest is Al powder; the welding material for the near-steel layer is a near-steel layer welding wire, which comprises a core and a sheath, wherein the core is composed of the following components in percentage by mass: Zn powder 40-50%, Ag powder 30-35%, Si powder 5-10%, and the rest is Fe powder. The material is specially used to solve the problems of large stress caused by mismatch of thermal physical properties and cracking caused by brittle phase generation in the butt welding process of the aluminum-steel composite plates. The application further discloses a butt welding method of the aluminum-steel composite plates.

The invention belongs to the technical field of negative pressure dust suppression, and discloses a slag discharge port negative pressure dust suppression device which comprises a negative pressure shell, and a sealing partition plate is fixedly mounted in the middle of the negative pressure shell. The dust filtering bag can be kept in a tight state in a supporting mode, the situation that the filtering effect is affected due to looseness is avoided, the height of each set of air guide barrels can be adjusted by using the lifting adjusting movable frame, the supporting rod is driven to rotate by adjusting rotation through the adjusting screw rod, and the fixing block cannot continue blocking after making contact with the welding rod; meanwhile, the supporting rod cannot continue to rotate, the supporting rod can be driven to move downwards by continuously rotating the opening adjusting knob again, the dust filtering bag can be pushed through the supporting hole disc at the bottom, and the problem that the filtering effect is affected due to loosening and deformation caused by mismatching of the keel and the dust filtering bag can be effectively solved through the mode.