190 results about "Embrittlement" patented technology

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 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.

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.

This invention relates to the field of alloy materials and discloses a method for preparing copper-chromium alloys by recycling copper-chromium alloy waste, comprising: 1) degreasing: immersing the copper-chromium alloy waste in an organic solvent to remove oil, cleaning, and drying; 2) embrittlement: placing the copper-chromium alloy waste in a hydrogen atmosphere, heating to above 500°C for at least 1 hour to embrittle, and then cooling; 3) cryogenic crushing: ball milling the copper-chromium alloy waste in liquid nitrogen medium to obtain copper-chromium alloy powder; 4) molding and pre-sintering: molding and pre-sintering the copper-chromium alloy powder to obtain a sintered blank; 5) densification: densifying and sintering the sintered blank to obtain a copper-chromium alloy. This invention sequentially processes copper-chromium alloy waste through degreasing, embrittlement, cryogenic crushing, molding and pre-sintering, and densification to obtain a copper-chromium alloy with high purity, high electrical conductivity, and high strength, achieving efficient recycling and reuse of copper-chromium alloy waste.

The invention belongs to the field of polymer composite materials, and discloses an antistatic composite material for a safety helmet and a preparation method of the antistatic composite material. Comprising the following components: 70 to 90 parts of a PC / ABS blending matrix, 12 to 20 parts of basalt fiber treated by a titanate coupling agent NDZ-311, 4 to 8 parts of a graphene quantum dot modified carbon nanotube-polyethylene glycol composite antistatic agent, 3 to 6 parts of polyaryletherketone micro powder, 0.2 to 0.6 part of an antioxidant 1010 and 0.4 to 1.0 part of calcium stearate. Wherein the mass ratio of PC to ABS in the PC / ABS blended matrix is (6: 4)-(7: 3); the invention aims to solve the problems that in the prior art, a single antistatic agent is difficult to consider the antistatic effect and the mechanical property, or materials are embrittled due to high addition amount, or the antistatic property fluctuates along with the environment and is easy to lose due to low addition amount; the interface bonding force between the conventional reinforced fiber and the PC / ABS matrix is weak, and the mechanical strength is limited to be improved; the long-term aging resistance of the material is poor, and the long-term use requirements of outdoor, chemical and other severe environments cannot be met.

A wrought nickel-molybdenum alloy containing 27.22 wt.% molybdenum, 4.73 wt.% iron, 0.47 wt.% chromium, 0.67 wt.% manganese, and 0.25 wt.% aluminum, and the balance nickel, as well as this alloy plus or minus the manufacturing variances typically encountered by each element during air melting, vacuum melting, and electro-slag remelting, have improved resistance to thermally-induced embrittlement over 100 hours at 1200⁰ F.

This invention discloses a method for improving the low-temperature impact toughness of high-strength heat-treated steel rails, comprising the following steps: composition control, smelting and refining, rare earth modification treatment, continuous casting / billing and heating homogenization, two-stage controlled rolling forming, online heat treatment with graded cooling and residual heat recovery, slow cooling on a cooling bed and straightening finishing. This invention determines the composition window based on the common constraint range of two sets of steel chemical composition standards for rails, and through the synergistic control of purification, effective rare earth modification, two-stage controlled rolling for grain refinement, and the online graded cooling and residual heat recovery heat treatment path, it reduces the sensitivity to low-temperature crack initiation, constrains the phase transformation path, and weakens the coupling between residual stress and microstructure embrittlement. Thus, while meeting the requirements for high strength, hardness, and wear resistance, it achieves qualified and stable low-temperature impact toughness.

The invention discloses a low-polarity hot-melt pressure-sensitive adhesive, which is prepared from the following raw materials in percentage by weight: 50 to 70 percent of APAO polyolefin, 10 to 25 percent of alkane wax, 20 to 30 percent of petroleum resin and 0.1 to 1 percent of antioxidant. The APAO polyolefin with different melt viscosities and different molecular weights at 90 DEG C is adopted, so that the cohesion, flexibility and thermal stability of the colloid can be remarkably improved, and the problem of high-temperature flowing or low-temperature embrittlement generated by the APAO polyolefin with single performance is avoided. According to the invention, the balance between the low viscosity of 3000 + / -300cps at 150 DEG C and the high softening point of more than or equal to 120 DEG C is realized. And moreover, the quick opening time and the wide temperature range adaptability are considered, and the film covering performance of plastic films such as BOPP, PET and PE is improved.

The invention belongs to the technical field of semiconductor processing auxiliary materials, and particularly relates to a PVC wafer protection film and a preparation method thereof. By compounding the polyester plasticizer and the powder modifier, a double insurance mechanism of'source replacement + adsorption anchoring 'is formed, so that an adhesive layer is effectively guaranteed to be completely separated from a base material when the PVC wafer protective film is stripped, and residual adhesive is further prevented from remaining on the surface of a wafer. According to the invention, the TPU elastomer and the rigid powder modifier are introduced to form a'soft-hard 'synergistic enhancement system, so that the prepared PVC wafer protection film shows puncture resistance far beyond that of a conventional formula when being punctured. By designing a multi-stage precise plasticizing control system, the plasticizing degree of PVC is synergistically regulated and controlled, the problems of molecular chain degradation, material embrittlement, puncture deformation and reduction of elongation at break caused by excessive plasticizing are effectively avoided, and meanwhile, the phenomenon that TPU and an inorganic powder modifier are non-uniformly dispersed is avoided.

This invention discloses a waterproof and anti-corrosion waterstop for construction joints and its preparation method, relating to the field of engineering waterstop technology. This invention improves upon traditional waterstops by preventing them from gradually hardening, becoming brittle, or losing their elastic recovery ability during long-term use, thus ensuring that the material maintains high tear strength and elongation at break even after aging, overcoming the shortcomings of insufficient anti-aging synergy in traditional technologies.

The invention provides an environment-friendly high-temperature-resistant low-smoke halogen-free flame-retardant cable, relates to the technical field of cables, and solves the technical problems of material embrittlement, insufficient oxygen isolation, high temperature resistance and flexibility imbalance caused by high filling of a flame retardant in the prior art. The cable sequentially comprises a copper alloy conductor, a nano compound insulating layer, a ceramic oxygen barrier layer and a bio-based LSZH sheath layer from inside to outside, a material compound system realizes the balance of flame retardance and mechanical properties through nano inorganic flame retardance, organic synergistic flame retardance and base material modification, and the environmental protection property is improved by doping bio-based PLA; and through three-layer co-extrusion and sectional gradient irradiation crosslinking, the production efficiency and the product consistency are improved. The long-term working temperature of the cable is 150-180 DEG C, the flame retardant rating reaches class A, the smoke density is smaller than or equal to 100 Dm, the tensile strength is larger than or equal to 12 MPa, the fire-resistant time is larger than or equal to 180 min, and the material cost is reduced by 10-15%.

The application discloses a kind of hierarchical PU insole production waste crushing regeneration recovery device, it is related to insole production field, including cylinder, vertical crushing mechanism and negative pressure backflow mechanism, the upper portion of the cylinder is equipped with top cover, the upper portion of the top cover is fixedly connected with low-temperature embrittlement treatment mechanism for the brittle and conveying of polyurethane plastic waste.The application, by three-stage gradient low-temperature embrittlement design, is matched with the turning and anti-sticking structure of the first auger conveyor and the second auger conveyor, weakens the elasticity of PU waste from the source, ensures that the material is brittle and uniform, completely eliminates the crushing rebound hidden danger, lays the foundation for efficient crushing of plastic waste, two-stage collaborative crushing and pushing mechanism reciprocating lifting design is combined, impact shearing and precision cooperation of rotary grinding are realized, matched with the guiding of material hopper to avoid material accumulation, compared with traditional one-way crushing, the crushing uniformity of plastic waste is greatly improved.

The invention belongs to the field of sealing materials, and discloses a high-pressure-resistant hydrogen embrittlement-resistant metal rubber composite sealing material and a preparation method thereof. The high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber composite sealing material comprises a titanium alloy base material, a metal rubber layer and a metal rubber layer which are sequentially stacked from bottom to top, the titanium oxide layer is generated on the surface of the titanium alloy base material in situ; and the rubber layer is adhered to the surface of the titanium oxide layer through hot pressing treatment. The invention further discloses a preparation method of the high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber composite sealing material, and the hydrogen-embrittlement-resistant metal rubber composite sealing material which can still keep stable deformation in a high-pressure environment is prepared by constructing the hydrogen-inhibiting oxidation layer and combining surface roughening, laser irradiation treatment and hot pressing treatment. After the high-pressure-resistant and hydrogen-embrittlement-resistant metal rubber sealing material is kept in a 100 MPa high-pressure hydrogen environment for 1000 hours, the tensile strength retention rate is larger than or equal to 88%, the percentage elongation retention rate after fracture is larger than or equal to 80%, and the deformation is smaller than or equal to 0.5%.

The invention belongs to the technical field of plastic pipe preparation, and particularly relates to a polypropylene hollow wall winding pipe and a preparation method thereof.The preparation method of the polypropylene hollow wall winding pipe comprises the following preparation steps of S1, raw material preparation, S2, base material extrusion, S3, winding forming, S4, welding reinforcement, S5, cooling shaping and S6, aftertreatment and detection. The ring stiffness and low-temperature impact resistance of the pipe can be synchronously improved through a composite modification system, the problem that the pipe is damaged due to low-temperature embrittlement after construction in winter in northern severe cold areas is solved, and deformation caused by insufficient ring stiffness after the pipe is deeply buried in soil is prevented; the pipe can stably adapt to complex scenes such as construction in a severe cold environment and pressure bearing of deeply-buried soil, is not limited by basic use requirements any more, and meanwhile, solves the processing problems of unstable melt flow and mold blockage during extrusion molding.

The application discloses a method for improving high-temperature water vapor oxidation resistance of FeCrAl alloy based on pre-oxidation, and the method comprises the following steps: performing surface pretreatment on FeCrAl alloy material; placing the pretreated FeCrAl alloy material in a high-temperature and high-pressure water environment to perform pre-uniform corrosion treatment, so as to form a double-layer oxide film; and placing the FeCrAl alloy material with the double-layer oxide film in a high-temperature water vapor environment to test the oxidation resistance thereof. The pre-uniform corrosion oxide film formed under the normal working condition of a nuclear reactor improves the oxidation resistance of the FeCrAl alloy under the accident high-temperature condition, especially enables the low-Cr-content FeCrAl alloy (Cr 10-12%) to have high-temperature oxidation resistance equivalent to or even better than that of the high-Cr-content alloy, and meanwhile, the irradiation embrittlement problem caused by the high-Cr-content is avoided, thereby providing technical support for development of a new generation of nuclear materials and safe operation of a nuclear power station.

This utility model discloses a multicolor telescope body cladding, including a cladding tube. Support tubes are connected to both sides of the cladding tube. Sealing slots are provided on both sides of the cladding tube, outside the support tubes. Sealing components, including sealing caps, are installed on both sides of the cladding tube. This utility model utilizes the high resilience and wear resistance of the styrene-butadiene rubber (SBR) inner tube, which is less prone to deformation and cracking, thus improving fatigue resistance. The use of a polyethylene (PE) tube optimizes structural strength and weather resistance, reduces the impact of thermal expansion and contraction by dispersing stress, adapts to temperature differences from -40℃ to 60℃, and prevents aging and embrittlement. The use of a maleic anhydride-modified TPE tube achieves a balance between lightweight and impact resistance, and also has low-temperature resistance, preventing aging and embrittlement. The use of a nitrile rubber (NBR) outer tube enhances oil resistance, chemical resistance, and low-temperature toughness, effectively resisting sweat, oil stains, or extreme environmental corrosion, improving overall durability and sealing.

The application discloses a stress-guided low-temperature cutting device and a cutting method thereof, and relates to the technical field of brittle material cutting. The stress-guided low-temperature cutting device comprises a roller and a spraying module which are installed in a main body. Periodic distribution of indentation teeth is arranged on the surface of the roller to press periodic grooves on the surface of a plastic strip, form a stress concentration guide belt, make the stress of a cutting hob release along the groove path, and then spray refrigerant to the groove in a direction through the spraying module to realize local embrittlement, so that the groove preferentially breaks under the stress of the cutting hob. Through the synergistic effect of the pre-indentation stress and the refrigerant directional embrittlement, the material fracture behavior is changed from random fracture to controllable fracture, the neatness of the cutting section is improved, and the precise and efficient cutting of the plastic strip is realized. Not only the problems of irregular section or material tearing caused by stress diffusion in the traditional cold cutting process are avoided, but also the cutting load is significantly reduced.

The invention relates to the technical field of film packaging, in particular to a polyamide flexibilizer and a preparation method thereof, and a high-toughness biaxially oriented polyamide film and a preparation method thereof. The polyamide flexibilizer overcomes the incompatibility of the flexibilizer and a nylon material, improves the toughness of a polyamide film, realizes the regulation and control of the dehydration rate of the material at low temperature by regulating and controlling the component proportion of the polyamide flexibilizer, and reduces the low-temperature embrittlement phenomenon; furthermore, the high-toughness biaxially oriented polyamide film is prepared by cooperating with a polyamide copolymer which is relatively weak in hydrogen-bond interaction between molecular chains and is relatively low in crystallization speed and melting point and cooperating with polyamide 12 which is low in water absorption rate, so that the technical effects of high toughness, low temperature resistance, high tensile strength, excellent punching depth, puncture resistance and easiness in ultrathin processing are realized; good market application prospects are realized.

The invention provides a ceramic / metal multilayer brazing structure and a preparation method and application thereof, and relates to the technical field of electronic packaging. The ceramic / metal multilayer brazing structure comprises a ceramic substrate, a titanium layer, a diffusion barrier layer and a nano bonding layer from bottom to top, wherein the thickness of the diffusion barrier layer is 10-40nm. According to the ceramic / metal multi-layer brazing structure, the diffusion barrier layer is additionally arranged between the titanium layer and the nano bonding layer, Ti atoms can be effectively prevented from diffusing upwards to the Cu or Ag layer, generation of a brittle Ti-Cu reaction layer is inhibited, disintegration of the multi-layer structure and interface embrittlement can be effectively prevented, and the service life of the ceramic / metal multi-layer brazing structure is prolonged. Therefore, the integrity of the amorphous Ag / Cu multilayer structure is kept, the long-term reliability of the joint is improved, the interface structure of the joint is more uniform, the stress concentration is reduced, and the reliability under long-term thermal cycle and mechanical shock is remarkably improved.

Disclosed in the present invention are a 980-MPa-grade automotive galvanized steel sheet resistant to liquid metal embrittlement during spot welding, and a manufacturing method therefor. The steel sheet is classified into a roll-formed steel sheet and a stamped steel sheet. The roll-formed steel sheet comprises the following chemical components in percentages by mass: C: 0.13%-0.16%, Mn: 1.60%-2.30%, Si: 0.80%-1.00%, Al: 0.035%-0.06%, P: 0.008%-0.015%, S≤0.003%, and the balance of Fe and inevitable impurities. The stamped steel sheet comprises the following chemical components in percentages by mass: C: 0.18%-0.25%, Mn: 1.80%-2.50%, Si: 0.80%-1.80%, Al: 0.05%-0.80%, P: 0.008%-0.015%, S≤0.003%, and the balance of Fe and inevitable impurities. The steel sheet is prepared by means of a process route consisting of continuous casting, hot rolling, cold rolling, and continuous annealing and galvanizing. The present invention has the advantage of involving a low-cost high-performance dual-carbon strategy, and produces roll-formed and stamped anti-LME QP 980-MPa products.

The application provides a kind of low carbon high phosphorus weathering cold upsetting steel satisfying cold upsetting large deformation and preparation method, belongs to steel preparation field.The chemical composition of the cold upsetting steel includes:C:0.15%~0.25%, Si:0.20%~0.30%, Mn:0.30%~0.40%, Cu:0.20%~0.60%, P:0.08%~0.14%, S≤0.01%, Ni:0.10%~0.15%, Cr:0.20%~0.50%, Al T :0.025%~0.06%; wherein, C and P satisfy the following relationship: [P]*[C]≤0.035.Rationally design the chemical composition of cold upsetting steel, inhibit pitting by proper high phosphorus content and Cu, Ni element cooperation, form passivation film, satisfy the corrosion performance of the atmospheric environment characteristics of strong radiation, high SO2 concentration.At the same time, control C and P satisfy the relationship, avoid the problem of phosphorus segregation, grain boundary embrittlement, so as to satisfy the requirement of cold upsetting one-time forming limit quantity>80%.

This invention discloses a quantitative characterization method for the degree of brittleness in high-strength steel. The method is characterized by integrating three factors—tensile-compressive asymmetry, elongation after fracture, and fracture morphology—to construct a brittleness evaluation index for the material. This quantitative characterization method for the degree of brittleness in high-strength steel better reflects the physical properties of high-strength steel, quantitatively describing the ratio of toughness to brittleness, and providing a more accurate and reliable characterization of brittleness. This allows for better application in fracture analysis and judgment of high-strength steel, improving the accuracy of the assessment.

The production technology comprises the technological steps of material selection, pretreatment, texturing treatment, electrostatic spraying and follow-up treatment, a base plate is subjected to texturing treatment after being subjected to polishing pretreatment, the roughness of the surface of the plate is changed, the adhesion strength of a follow-up coating and the base plate is enhanced, and the surface of the base plate is subjected to electrostatic spraying; a small amount of fluorine is added into a polyester powder coating in electrostatic spraying, so that the hydrophobic and oleophobic properties of the coating are improved, the acid and alkali resistance and pollution resistance of a film layer are improved, the phenomena of cracking and embrittlement caused by long-time use are avoided, and the service life is prolonged; according to the present invention, the use amount of fluorine is reduced, the powder coating material has advantages of environmental protection, stable performance and good durability, the barium sulfate commonly used in the powder coating material is not used, the use amount of the pure polyester is increased, and the cracking phenomenon during bending, stamping and molding of the plate is improved.

The present invention addresses the problem of providing a method for producing a steel material in which it can be expected that hot shortness is suppressed. A means for solving the problem is a method for producing a steel material including at least Cu and S, the method for producing a steel material including: a holding step for holding a steel raw material including at least Cu and S to a range from the temperature at which a sulfide of Cu enters solid solution to 1,300° C for 180 seconds or more; and a steel raw material cooling step for cooling the steel raw material after holding the steel raw material to an austenite area temperature for 180 seconds or more.

The invention provides a liquid nitrogen cooling auxiliary disassembling device for a composite insulator. The liquid nitrogen cooling auxiliary disassembling device comprises an intelligent control unit, a gradient cooling embrittlement unit and a composite vibration separation unit, the intelligent control unit collects real-time material data of the composite insulator in real time, inputs the real-time material data into an internal preset material brittleness prediction model to calculate a brittleness index, and sends out a valve opening signal according to the brittleness index; capturing the material fracture characteristic frequency in real time, and calculating the vibration parameters of the composite vibration separation unit by adopting a PID (Proportion Integration Differentiation) algorithm; the gradient cooling embrittlement unit cools the composite insulator step by step according to a valve opening signal to embrittle the composite insulator; and the composite vibration separation unit is arranged at the output end of the gradient cooling embrittlement unit and is used for applying composite vibration to the catalyzed composite insulator according to the vibration parameters so as to separate metal and rubber materials. Through cooperative operation of multiple systems, efficient separation of silicone rubber and metal parts is achieved.

The application provides an amorphous magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: (1) brittle heat treatment is performed on a Fe-based amorphous alloy, the amorphous alloy is broken and then pre-annealing treatment is performed to obtain amorphous powder, and two portions of the amorphous powder are taken and sieved through different sieves to obtain first powder and second powder; (2) the first powder and the second powder are mixed, and then MgO is used to perform magnetron sputtering treatment on the first powder and the second powder to obtain precursor powder; (3) surface modification treatment is performed on nano ferrite powder, the precursor powder and the surface-modified nano ferrite powder are mixed and ground, a binder is added for granulation, and then annealing treatment is performed after compression treatment to obtain the amorphous magnetic powder core. The amorphous powder / MgO / ferrite double-layer core-shell structure amorphous composite material is prepared by using the magnetron sputtering method and the mechanical ball milling method, and the prepared magnetic powder core has high permeability, low power loss and good direct current superposition performance.

This invention discloses an aqueous TPU film and its production method, belonging to the field of polyurethane film production technology. This aqueous TPU film achieves self-healing by grafting disulfide bonds and using them as crosslinking agents, and by grafting benzotriazole and polytetrahydrofuran ether onto thermoplastic polyurethane using a silane coupling agent. This results in a self-healing function that can be achieved at room temperature (25°C) without the need for high-temperature equipment, relying solely on disulfide bonds, with a repair rate exceeding 80%. Simultaneously, benzotriazole specifically absorbs ultraviolet light, inhibiting photo-oxidative degradation; the polytetrahydrofuran soft segment (Tg≈-70°C) ensures the material maintains good elasticity at -40°C, solving the low-temperature embrittlement problem; the rigid benzene ring and the polyurethane hard segment synergistically enhance its mechanical strength: tensile strength ≥30MPa, tear strength ≥80kN / m, and the long ether chain soft segment ensures elastic recovery rate, achieving a balance between mechanical strength and toughness, suitable for coatings, films, seals, and other applications.

The invention relates to an aluminum alloy soldering lug and a preparation method and application thereof, and belongs to the technical field of welding. The aluminum alloy soldering lug disclosed by the invention is prepared from the following elements in percentage by mass: 3.0 percent to 4.5 percent of Si, 2.0 percent to 3.5 percent of Fe, 0.8 percent to 1.2 percent of Mg, 0.10 percent to 0.25 percent of Zr, 0.05 percent to 0.15 percent of Sc, 0.02 percent to 0.08 percent of Er, 0.05 percent to 0.12 percent of Ti, 0.005 percent to 0.02 percent of B and the balance of Al and other inevitable impurities. The mass ratio of (Zr + Sc) / Fe is 0.08 to 0.15; the mass ratio of Mg to Si is 0.25 to 0.35; the mass ratio of (Fe + Si) to (Zr + Sc + Er) is 20-25; the problems that laser welding aluminum alloy is thick in weld joint structure and uneven in performance, and a dissimilar material welding interface is embrittled are fundamentally solved.

The invention relates to the technical field of cold-rolled complex-phase steel welding, in particular to a continuous annealing inlet welding method for 980 MPa-grade cold-rolled complex-phase steel. A narrow lap welding machine is adopted, the strip tail of the front strip steel coil and the strip head of the rear strip steel coil are sheared and then subjected to lap welding, and the welding process parameters are controlled as follows: the current is 10-18 kA, the speed is 10-17 m / min, the pressure of a welding wheel is 12-27 kN, the lap amount is 0.9-1.6 mm, and the compensation amount is 0.8-1.2 mm. By means of collaborative optimization of the parameters and precise regulation and control of welding heat input and mechanical action, the embrittlement tendency of a heat affected zone is effectively restrained, a welding joint is promoted to present an ideal vertical welding seam fracture mode, and therefore the technical problem that 980 MPa-grade cold-rolled complex-phase steel is prone to strip breakage when welded at an inlet of a continuous annealing production line is fundamentally solved. And the stability and efficiency of continuous annealing production can be remarkably improved, the rolling performance of products is guaranteed, and application and popularization on existing equipment are easy.