416 results about "Embrittlement" patented technology

The invention discloses a 1000MPa-grade steel plate with high toughness, strain aging embrittlement resistance and excellent weldability and a manufacturing method thereof. The 1000MPa-grade steel plate comprises the following components in percentage by weight: 0.09 to 0.13 percent of C, less than or equal to 0.20 percent of Si, 0.70 to 1.00 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0030 percent of S, 0.15 to 0.40 percent of Cu, 1.50 to 3.00 percent of Ni, 0.45 to 0.70 percent of Cr, 0.40 to 0.65 percent of Mo, 0.040 to 0.070 percent of V, 0.010 to 0.030 percent of Nb, 0.004 to 0.012 percent of Ti, 0.040 to 0.070 percent of Als, 0.0009 to 0.0017 percent of B, less than or equal to 0.0050 percent of N, less than or equal to 0.0030 percent The tensile strength of the steel plate is larger than or equal to 950 MPa, the yield strength is larger than or equal to 890 MPa, the Charpy longitudinal / transverse impact energy (single value) at the temperature of-60 DEG C is larger than or equal to 100 J, the strain aging transverse impact energy (single value) at the temperature of-40 DEG C is larger than or equal to 47 J, the elongation at break delta 5 is larger than or equal to 15%, and the weldability is good (the preheating temperature is smaller than or equal to 150 DEG C, and the steel plate can bear welding heat input of 30 kJ / cm-50 kJ / cm). And the method is particularly suitable for hydropower engineering, ocean platform structures and major equipment manufacturing.

The invention relates to the technical field of cable sheath materials, and provides a high-speed locomotive cable super-cold-resistant sheath material and a preparation method thereof, and the super-cold-resistant sheath material comprises the following raw material components by mass: 60-80 parts of a matrix polymer; 5 to 15 parts of a toughening agent; 3-10 parts of a cold-resistant auxiliary agent; 10 to 20 parts of a flame retardant; 1-5 parts of an antioxidant; 3-10 parts of a nano modified filler; and 1-5 parts of a cross-linking agent. The preparation method comprises the following steps: selecting the raw materials according to the proportion, putting the raw materials into mixing equipment, uniformly mixing to form a primary mixture, and preparing the primary mixture into the composite material through a melt blending process under specific temperature and shearing conditions. The obtained composite material is processed through an extrusion molding process to obtain a sheath material with excellent flexibility, impact resistance and aging resistance, and the problem that an existing material still has embrittlement, cracking or performance reduction in an extremely cold environment is solved.

The invention discloses a coating and hot-pressing process of a PHA material, and belongs to the field of packaging material coating. The process comprises the following steps: tightly combining a molten PHA coating material with a base material through hot pressing; the PHA coating is further compacted through a hot press polish roller, and bubbles between the PHA coating and the base material are eliminated; then entering a cooling device, rapidly cooling through internal water circulation so as to cure the PHA coating, and meanwhile, spraying a trace amount of deionized water mist so as to prevent the base material from being dried and embrittled due to high temperature; entering a recrystallization zone, regulating and controlling the crystallinity of PHA, and balancing the mechanical property and degradation rate. The PHA can be well bonded with various base materials (such as paper, fabrics and films) in the hot pressing process, and an additional adhesive is not needed. Therefore, the technological process is simplified, and the cost is reduced. And the PHA can be uniformly coated on the surface of the base material through the hot pressing process to form a compact coating, so that the performance consistency of the product is ensured.

The invention discloses an austenitic stainless steel welding wire for a liquid hydrogen storage tank and a preparation method and application of the austenitic stainless steel welding wire, and belongs to the technical field of welding materials and preparation of the welding materials. The welding wire solves the problem that the low-temperature performance of a welding seam is poor when the current welding wire for the liquid hydrogen storage tank is used for welding. The welding wire comprises the following chemical components in percentage by mass: less than or equal to 0.02% of C, 0.4-1.5% of Si, 5.0-7.5% of Mn, less than or equal to 0.020% of S, less than or equal to 0.030% of P, 16.0-22.0% of Cr, 15.0-18.0% of Ni, 2.0-5.0% of Mo, 0.05-0.2% of N, less than or equal to 0.01% of O and the balance of Fe and inevitable impurities. According to the welding wire, deposited metal is low in low-temperature embrittlement tendency, high in low-temperature strength and excellent in low-temperature impact and fracture toughness. The welding wire is used for welding the austenitic stainless steel liquid hydrogen storage tank and is wide in application range, and the mechanical property of deposited metal is good.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength corrosion-resistant ABS composite flame-retardant material and a preparation method thereof. The ABS composite flame retardant material is prepared from the following raw materials in parts by weight: 60 to 75 parts of acrylonitrile-butadiene-styrene, 10 to 15 parts of glass fiber, 0.5 to 1 part of gamma-aminopropyltriethoxysilane, 8 to 12 parts of phosphorus-nitrogen flame retardant, 1 to 3 parts of nano aluminum oxide, 0.5 to 1 part of potassium perfluorooctane sulfonate, 1 to 3 parts of epoxy modified graphene oxide and 5 to 8 parts of modified nano montmorillonite. Through the synergistic effect of the epoxy silane modified graphene oxide and the long-chain alkylsilane modified nano montmorillonite, the mechanical property, the corrosion resistance and the flame retardant effect of an ABS matrix are remarkably enhanced. The modified material maintains toughness under high strength, effectively avoids embrittlement, and shows excellent impact resistance and environmental protection property.

The invention relates to the technical field of cables, in particular to a preparation method of a high-temperature-resistant low-temperature-resistant high-toughness cable material and a cable for an oil platform, the cable comprises a cable body, a bionic stranded conductor is arranged in the cable body, and a gradient insulating layer is fixedly connected to the surface of the bionic stranded conductor. The surface of the gradient insulation layer is fixedly connected with a three-layer co-extrusion sheath layer. According to the invention, the feasibility of a core innovation point (a bionic conductor and a gradient sheath) is proved through basic performance verification, the typical working conditions of an oil platform, such as low-temperature embrittlement and dynamic load, are covered through an extreme environment test, and the synergistic effect of key parameters (DCP dosage and vulcanization temperature) is determined through technological parameter optimization; the relation between quantitative repair efficiency and trigger conditions is verified through a self-repair mechanism, three-year equivalent aging is simulated through long-term reliability evaluation, the technical economy is proved, and meanwhile the core requirements of wide-temperature-range stability, mechanical fatigue resistance, chemical corrosion resistance and the like are met.

The invention relates to a welding method of a Q370qENH + S32168 weather-resistant stainless steel composite steel plate. Comprising the steps that the butt joint position of two to-be-welded weather-proof stainless steel composite steel plates is machined into inclined faces, the inclined faces of the butt joint position are spliced into a V-shaped opening, a splash-proof protection belt is pasted, a ceramic liner is placed, base layer bottoming welding is conducted, base layer filling welding is conducted, transition layer welding is conducted, and composite layer welding is conducted. According to the method, it is guaranteed that a welding seam of a base layer base layer welding layer has good weather resistance and mechanical performance, and it is guaranteed that the corrosion resistance of the welding seam is matched with that of a Q370qENH weather-resistant steel base layer; the welding thickness of the transition layer welding layer made of dissimilar materials is controlled, the non-uniformity of the structure of the transition position is improved, the welding stress is reduced, embrittlement and crack generation of the transition layer welding layer are prevented, and it is guaranteed that the transition layer welding layer has excellent plasticity and toughness; and the corrosion resistance requirement of the welding layer of the composite layer is ensured.

To suppress embrittlement of a powder line part material by production of zirconium carbide inside a powder line part, and occurrence of sudden troubles such as hole opening of the powder line part caused by the embrittlement.SOLUTION: A molten steel flow passage 5 includes an upstream flow part 50 provided with an inflow port 3, a downstream flow part 52 provided with a discharge hole 4, and a boundary part 51 in a boundary between the upstream flow part 50 and the downstream flow part 52, wherein a circle equivalent diameter DU of the upstream flow part 50 is set to be larger than a circle equivalent diameter DL of the downstream flow part 52, the boundary part 51 is provided at a position higher than the powder line part 6, and a lining layer 7, which is composed of a material different from a zirconia / graphite material and has thickness of 8 mm or more, is provided inside the power line part 6.SELECTED DRAWING: Figure 1

The invention relates to the technical field of waste battery recycling, in particular to a battery module lossless disassembling method based on low-temperature brittleness difference, which comprises the following steps: step 1, analyzing material brittleness and formulating a gradient cooling program; 2, local directional cooling and embrittlement control, wherein a low-temperature cooling medium is adopted to conduct directional spraying on the adhesive concentration area, and meanwhile the temperature of the metal current collector is maintained to be higher than the embrittlement temperature of the metal current collector through heat insulation protection; temperature distribution is monitored in real time, cooling parameters are dynamically adjusted, and it is ensured that a target material is completely embrittled; step 3, vibration separation and layered recovery: applying low-frequency vibration to the embrittled battery module to break the embrittled material layer; and sorting materials based on fragment size and density difference, and recovering the complete metal current collector. By means of the steps, it is guaranteed that materials are not damaged in the disassembling process, and lossless disassembling and efficient recycling of the battery module are achieved through accurate control and the efficient sorting process.

The invention discloses an anti-embrittlement flexible armored cable in an extremely cold environment. The anti-embrittlement flexible armored cable comprises a conductor, an insulating layer, a buffer isolation layer, a flexible armored layer and an outer sheath layer which are sequentially arranged from inside to outside. According to the armored cable, the structure of an existing cable is improved, the material formula of the insulating layer and the material formula of the outer sheath layer are optimized, the requirements for embrittlement resistance and high flexibility can be met, the protection performance of the armored cable can be enhanced, and aging tests show that the cable has good flexibility. The cable can meet the use requirement of long-term stable operation under the extremely cold severe condition with the temperature of-60 DEG C, has important practical significance and economic value, is reasonable in design, and is worthy of popularization and use.

The invention relates to the technical field of electric digital data processing, in particular to an aging analysis method for a boiler dissimilar steel welded joint, and the method comprises the following steps: carrying out a performance test on the prepared dissimilar steel welded joint to obtain a performance test result; based on a performance test result, obtaining a first aging degree grading database corresponding to the nonlinear ultrasonic coefficient and the different aging degree data, and a second aging degree grading database corresponding to the magnetic characteristic parameter and the different aging degree data; and utilizing the first aging degree grading database and the second aging degree grading database to construct an aging degree grading database of the prepared dissimilar steel welding joint under different aging degrees. Therefore, the problems that in the related technology, component embrittlement, carbon migration, creep strength mismatch, residual stress concentration and the like of a fusion area are prone to occurring, safe operation of a unit is seriously threatened, and a dissimilar steel welding joint is high in non-uniformity, prone to cracking and the like are solved.

The invention relates to the technical field of building materials, and discloses a self-repairing microcapsule-based composite waterproof material and a preparation method thereof, and the self-repairing microcapsule-based composite waterproof material comprises the following components by weight: 60-80 parts of modified organic silicon resin, 5-15 parts of nano clay (modified montmorillonite), 3-8 parts of a self-repairing microcapsule, 2-5 parts of a water-based cross-linking agent, and 0.5-2 parts of a dispersing aid. Stress generated by settlement and temperature change of a building structure can be effectively resisted, and cracks are reduced fundamentally; meanwhile, the material still keeps flexibility at the low temperature of-30 DEG C (without cracks when bent), and the technical bottleneck that a traditional material is prone to embrittlement in a cold region is broken through; more importantly, the 24-hour self-repairing rate is up to 92%, self-healing of cracks can be achieved without manual intervention, the service life of waterproof engineering is prolonged to more than two times that of a traditional material, the full-life-cycle maintenance cost is remarkably reduced, and a long-acting and reliable solution is provided for the field of building waterproofing.

The invention relates to the technical field of coating part preparation, in particular to a zinc-iron coating part and a preparation method thereof. The preparation method comprises the steps that a part steel base body is annealed, and an annealed base plate is obtained; carrying out hot dipping on the annealed substrate by using a zinc-containing plating solution, and then carrying out alloying treatment to obtain a rough steel plate containing a zinc-iron plating layer; the rough steel plate is subjected to cold stamping forming, and a preformed part is obtained; according to the thickness of the preformed part, the optimal hot stamping processing parameters are determined; and the rough part is subjected to heat treatment through the hot stamping treatment parameters, and the zinc-iron coating part is obtained. The hot stamping treatment parameters comprise austenitizing heating temperature and austenitizing heat preservation time; and the thickness of the preformed part is in positive correlation with the temperature and the time respectively. According to the preparation method, the correlation between the thickness of the preformed part and the austenitizing heating temperature and the austenitizing heat preservation time is defined, so that the content of a brittle gamma phase in a zinc-iron coating is reduced; and further, the liquid metal embrittlement sensitivity of the preformed part in the hot stamping treatment process is reduced.

The invention relates to the technical field of photovoltaic connector manufacturing, in particular to a temperature control forming process of a photovoltaic nylon connector mold and a composite runner, the mold is divided into a fixed mold area, a movable mold area, a mold cavity area, a mold core area and a pouring gate area, and each area is provided with an independent temperature control loop. According to different requirements of the mold filling state and the cooling stage of nylon materials, the temperature of each area of the mold is dynamically adjusted, the mold temperature is properly increased in the initial mold filling stage, a cavity is rapidly filled with melt, and along with mold filling, the mold temperature is gradually reduced, and melt cooling and crystallization are accelerated. According to the temperature control forming process of the photovoltaic nylon connector mold and the composite runner, the phase change energy storage material is embedded in the fixed mold area of the mold, and the heat absorption and release characteristics of the phase change energy storage material during phase change are used for assisting temperature control, so that the problem of embrittlement or insufficient strength caused by non-uniform crystallization of a product in a traditional process is solved; and the photovoltaic connector is ensured to have good mechanical property and weather resistance in long-term use.

The invention discloses a microcrack-assisted composite microstructure surface forming method, and belongs to the technical field of precision machining of complex microstructure surfaces of brittle materials. According to the generating method of the composite microstructure surface, machining is carried out in the range that the cutting depth is larger than the brittle-plastic transformation critical cutting depth and smaller than the cutting depth range that the microdefect extends to the lowest point of a groove mainly through active modulation of the tool pose and the vibration track in cooperation with tool feeding path planning; microcracks are used for inducing to form machining microdefects and extend towards the single side and the surface of the tool machining direction, material removal is achieved by regulating and controlling mutual extension and intersection of the microcracks in a specific area, or composite microstructure surface generation is achieved by regulating and controlling generation of the microdefects induced by the microcracks in a specific position. According to the method, the space low-frequency feature structure with the plastic removal feature can be created on the brittle material at a time, the composite microstructure surface with the space high-frequency embrittlement removal feature can be created on the plastic low-frequency space, the efficiency is high, and the cost is low.

The invention relates to a method for evaluating the crack initiation probability of an RPV surface crack under a transient working condition, and belongs to the field of safety analysis of nuclear pressure-bearing equipment. The method comprises the following steps: sampling a random variable and determining a sampled multivariate sample; calculating a stress intensity factor of the crack evaluation point caused by multiple loads under the transient condition; calculating a stress intensity factor of the crack evaluation point after the influence of the crack tip plastic zone is brought into the transient condition; calculating the reference temperature of the crack evaluation point after neutron irradiation embrittlement is considered under the transient condition; constructing a fracture toughness probability distribution model of the crack evaluation points under the transient condition; calculating the crack initiation probability of the crack at the current moment under the transient condition; judging whether the current moment is the last moment of the transient working condition, if so, ending the calculation process of the crack initiation probability under the transient working condition, and otherwise, updating the transient moment; and evaluating the crack initiation probability of the RPV surface cracks under all samples. According to the method, the crack initiation probability of the RPV surface crack under the transient working condition can be efficiently and accurately evaluated.

The invention relates to the technical field of laser welding, and particularly discloses laser welding equipment for instrument and meter production and manufacturing, the laser welding equipment for instrument and meter production and manufacturing achieves the purpose of stably clamping a circular workpiece, and the equipment is supported by an equipment bottom plate and an equipment bracket; the welding support supports the electric lifting table and the laser welding head, the laser welding head welds components, the protection device performs gas protection on the components, gas consumption is low while gas protection is performed in the welding process, and the density of pure inert gas is slightly larger than that of air, so that gas retention is facilitated, and the welding quality is improved. According to the welding device, the circular shell accessories are fixed and rotated through the corresponding assemblies, so that the welding requirements of different angles are met, meanwhile, liquid inert gas is gasified and heated through the pneumatic device, welding embrittlement caused by gas supercooling is avoided, and the error influence caused by fan vibration on welding is counteracted.

The invention relates to the technical field of copper-clad plate processing, in particular to a processing technology for a copper-clad plate, which comprises the following steps: S1, preparing semi-finished sizing paper; s2, pressing the copper-clad plate; s3, embrittlement glue coating is carried out; s4, stacking the copper-clad plates; s5, uniformly cutting and drilling the stacked copper-clad plates; s6, performing low-temperature embrittlement separation and vibration separation; and S7, when preparation of a single batch of copper-clad plates is completed, the copper-clad plates are selected for detection, side edge profile curves of the copper-clad plates for detection are obtained, and whether the copper-clad plates are qualified or not is determined based on profile coincidence parameters, determined by the side edge profile curves, of the single copper-clad plates. According to the method, the copper-clad plate is selected to be detected, the parameters of the copper-clad plate are obtained, the parameters comprise the side edge profile curve and the profile difference parameter, the copper-clad plate is judged according to the obtained parameters, when it is determined that the copper-clad plate is unqualified, the machining process of the copper-clad plate is controlled and adjusted in real time according to the specific conditions of the copper-clad plate, and the production efficiency of the copper-clad plate is improved.

The invention discloses a heat treatment method for improving fracture toughness and hydrogen embrittlement resistance sensitivity of steel, which comprises the following steps: S1, carrying out preheat treatment on sample steel to obtain the sample steel subjected to preheat treatment; s2, austenitizing treatment is carried out; s3, quenching the sample steel subjected to austenitizing treatment in S2; s4, cooling the sample steel quenched in the step S3 in air; s5, aging treatment is conducted on the sample steel cooled in the step S4; the method is characterized by further comprising the following steps between S1 and S2: carrying out sub-temperature austenitizing treatment on the sample steel subjected to pre-heat treatment; and then oil medium quenching is carried out. After the A-100 ultrahigh-strength steel is subjected to heat treatment, on the premise that the tensile strength and the fracture toughness of the A-100 ultrahigh-strength steel meet design indexes, the hydrogen embrittlement sensitivity resistance of the A-100 ultrahigh-strength steel in a high-embrittlement environment can be greatly improved.

The invention relates to the technical field of steel and iron smelting, in particular to corrosion-resistant steel and a preparation method and application thereof, and the corrosion-resistant steel contains C, Si, Mn, P, S, Cr, Ni, Cu and Fe. The corrosion-resistant steel is prepared from, by weight, 0.15%-0.20% of C, 0.18%-0.28% of Si, 0.75%-0.85% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.85%-0.95% of Cr, 0.26%-0.32% of Ni, 0.20%-0.36% of Cu, and the sum of the content of Cr, the content of Ni and the content of Cu gt. 1.25%, 1.25%; and the model number of the corrosion-resistant steel is 15CrNiCu. By adjusting element components in the corrosion-resistant steel and optimizing process parameters, the problems of cracking, embrittlement and descaling in the prior art are effectively solved, and meanwhile, the corrosion resistance and the mechanical property of the steel are improved.

The invention relates to the technical field of welding equipment, and particularly discloses cooling equipment for metal building material welding, and the cooling equipment for metal building material welding achieves the purposes of cooling a workpiece and carrying out gas protection during welding. The heat dissipation device dissipates heat generated in the welding device, so that the working state of the welding device is stabilized, long-time work is facilitated, gas is guided into the surface of a workpiece through the pipeline design of the heat dissipation device, and therefore the welded workpiece is rapidly cooled; due to the fact that the temperature rises after heat is transferred through the surface of the welding device, the temperature difference between the gas temperature and the workpiece is reduced, workpiece embrittlement caused by too fast cooling is avoided, the heat dissipation device blows the surface of the workpiece in a targeted mode, compared with a traditional gas protection mode, the using amount of nitrogen is reduced, the workpiece is self-locked and fixed through the fixing device, and the welding efficiency is improved. And welding errors caused by shaking of the workpiece during welding are prevented.

The invention discloses a method for improving the welding performance of low-alloy high-strength wind power steel, which is characterized by comprising the steps of optimization of welding heat input, preheating before welding, welding process control and slow cooling after welding. By optimizing the welding heat input parameters, reasonably controlling the time (t8 / 5) for cooling to 500 DEG C from 800 DEG C, adjusting the structure transformation behavior of the welding heat affected zone and combining the process measures of preheating before welding, slow cooling after welding and the like, precise regulation and control of the microstructure of the welding heat affected zone are achieved, the hardening tendency and the embrittlement phenomenon of a coarse grain zone are effectively restrained, and the welding quality is improved. And therefore, the strength, toughness and crack resistance of a welding joint are remarkably improved, and the high requirements of offshore wind power structural parts for welding quality and service performance are met.

The invention belongs to the field of natural gas development, and discloses a high-strength and high-ductility soluble alloy and a preparation method and application thereof, and the soluble alloy comprises the following components in percentage by weight: 8-10% of Mg, 1-2% of Ce, 0.5-1% of Mn, 0.1-0.5% of Bi, 1-2% of Re, 0.5-1% of Ti, 0.5-1% of C, 0.5-1% of Cr, 0.5-1% of Ga, 0.5-1% of Cu and the balance of Al and impurities. The strengthening effect of the Mg element on the aluminum alloy is improved by increasing the content of the Mg element in the alloy, meanwhile, the problems of low tensile strength and sodium brittleness caused by the high Mg element content are solved, the prepared soluble alloy has the characteristics of high strength, high ductility and good solubility, and the performance requirements of the bridge plug preparation field on the soluble alloy are met.

The utility model provides a dissimilar steel strip isolating layer submerged-arc welding structure which comprises a first base material and a second base material, the edges of the first base material and the second base material are subjected to the same beveling operation, specifically, the front side and the back side of each plate end are each provided with a beveled edge, the plate ends are assembled to form an X-shaped beveled edge, and a truncated edge is reserved in the middle of each beveled edge; and surfacing the edge of the first base material to form a first welding body with the same thickness, butting the edges of the first base material and the second base material, and welding to obtain a second welding body. According to the method, subsequent submerged-arc welding is converted into similar steel welding through the isolation layer structure, and the risk of cracking caused by interaction of high residual stress and brittle structures after dissimilar steel welding is eliminated; and meanwhile, the problems that a wide recarburization and decarburization layer is generated due to carbon diffusion migration in direct welding of dissimilar steel, and cracking is caused due to serious ferrite embrittlement of a decarburized wide ferrite belt under long-time heat treatment and high-temperature operation are solved.

The utility model relates to the technical field of turnover boxes, in particular to a low-temperature-resistant turnover box with a lateral outwards-protruding guide sliding structure, which comprises a turnover box main body and a sliding mechanism. According to the turnover box, through the arrangement of an anti-skid pad, an anti-skid block, a sliding groove, a first sliding block, a buckle and a clamping groove, firstly, the box cover is opened, the box cover is pushed to be closed after objects are put in, a first insertion buckle on one side of the lower portion of the box cover is inserted into an insertion buckle groove in one side of the top of the turnover box body to be fixed, and secondly, a protection mechanism in the turnover box body can buffer external impact force and vibration; the low-temperature-resistant coating prevents the main body from being embrittled and broken, and the insulation board maintains the low-temperature environment in the box and protects the quality safety of articles. And finally, the bottom non-slip mat increases friction force to ensure the stability of the turnover box, and the non-slip blocks on the two sides assist in guiding and prevent sideslip during transportation. When a plurality of turnover boxes are connected, the first sliding blocks are inserted into the sliding grooves, the buckles and the clamping grooves are clamped to guarantee firm connection, and the first sliding blocks can be pulled out by pressing down the buckles during separation.

The invention belongs to the field of organic silicon materials, and particularly relates to carborane modified heat-resistant silicone oil and a preparation method thereof. The carborane modified heat-resistant silicone oil is prepared by introducing a molecular chain containing a benzene ring and carborane structure into a side chain of the silicone oil, and the heat resistance and radiation resistance of the hydrogen-containing silicone oil are remarkably improved by utilizing the synergistic effect of a cage structure of the benzene ring and carborane; the modified silicone oil can still keep good physical and chemical properties in high-temperature and radiation environments, the application range of the modified silicone oil in the high-temperature and radiation fields is expanded, the modified silicone oil rubber material containing a carborane structure can be further processed to be used in a thermal protection system of an aircraft, and the situation that the aircraft is prone to falling off in the high-speed flight process is prevented. And the material embrittlement and cracking are caused by violent friction between the surface of the aircraft body and air, so that the structural integrity of the aircraft is effectively protected.

The invention discloses a welding process control method for a W-shaped structure of a light aviation radiator. The welding process control method comprises the following steps that a gas collecting hood, a connector pipe nozzle, a corrugated plate and a barrel are subjected to positioned welding; the inner cavity of the corrugated plate and the inner cavity of the gas collecting hood are sealed; high-purity argon is introduced from the position of a connector pipe nozzle, an argon detector is connected to the far end of the corrugated plate to detect the purity of argon in an inner cavity of the corrugated plate, a welding gun dragging cover is placed at a weld joint after the purity reaches the standard, then a transparent ceramic nozzle is installed on one end face of the welding gun dragging cover, and a gas blocking and heat absorbing tool is installed on the corrugated plate; in addition, argon is introduced to protect the welding seam area on the back face of the barrel; welding parameters are adjusted, welding of the welding seam of the W-shaped structure is carried out, and after welding is finished, welding is stopped for 15 seconds or above, and various protection tools can be disassembled. Through the control method, the material embrittlement problem in the welding process is solved, and the product stability is improved.

The invention relates to the technical field of steel-plastic composite pipe machining, and discloses a steel-plastic composite pipe sealing forming device and method.The steel-plastic composite pipe sealing forming device comprises a base, a supporting mechanism, a sealing mechanism, a grinding mechanism and a fixing plate are arranged at the top of the base, and a rotating shaft is rotationally installed in the fixing plate; the sealing mechanism comprises an extrusion cylinder and a spiral auger, the spiral auger is rotatably mounted in the extrusion cylinder, one end of the extrusion cylinder is communicated with a square-opening extrusion nozzle, and a preheating mechanism and a flattening mechanism are arranged on one side of the extrusion cylinder. The device is reasonable in design, the temperature of a plastic layer and the contact pressure of the flattening roller are monitored in real time through a closed-loop control system integrating the temperature sensor, the pressure sensor and the semiconductor refrigeration ring, the temperature sensor dynamically adjusts the power of the semiconductor refrigeration ring, and the cooling airflow temperature is accurately controlled; embrittlement caused by too fast cooling of the plastic layer or deformation caused by insufficient cooling is prevented.

Disclosed in the present invention is a composite coating for steel. The composite coating comprises a first coating and a second coating which are sequentially arranged in the thickness direction of the coating, wherein the first coating is in direct contact with a steel substrate and comprises Mo and / or Cr, and the second coating is a zinc-based coating. Further disclosed in the present invention are a coating method for the composite coating, a steel plate comprising the coating, and a spot-welded joint comprising the steel plate. The present invention can greatly inhibit the phenomenon of liquid metal embrittlement caused by welding during a spot welding process, reduce cracks generated due to the phenomenon, and ensure the performance stability and functional stability of a steel plate, especially a galvanized high-strength steel plate.

This invention provides a crack-resistant, high-toughness composite packaging bag and its preparation method, relating to the field of composite packaging bag technology. The bag includes a bag body comprising an inner cold-resistant toughening layer, a middle elastic buffer layer, and an outer tough protective layer. The inner wall of the bag body has a material guide strip, and the bottom of the inner wall has longitudinal reinforcing ribs. The material guide strip has exhaust micropores. A flexible buffer pad is installed at the bottom of the bag body. Elastic buffer strips are provided on both sides of the bag body. Rounded transition corners are provided on both outer sides of the bottom of the bag body. In this invention, by using an inner cold-resistant toughening layer made of modified metallocene PE and POE toughening agents combined with a TPE material middle elastic buffer layer, the toughness of the bag body in low-temperature environments of -18℃ to -5℃ is significantly improved, preventing low-temperature embrittlement of the substrate. It can effectively withstand the instantaneous impact of high-speed filling of viscous materials, completely solving the problem of low-temperature embrittlement and cracking.