3160 results about "Cooling speed" patented technology

The invention relates to a hot-rolled wire rod for a 2500 MPa bridge cable and a manufacturing method of the hot-rolled wire rod, which are characterized in that after Nb-V-Mo high-carbon component is rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 33 DEG C / s through online molten salt rapid cooling isothermal treatment, and enters a sorbite phase region from an austenite state to form a structure mainly comprising sorbite and control the precipitation and growth of carbides; the hot-rolled wire rod with a microscopic structure comprising a mixed structure composed of tempered sorbite, ferrite and fused sorbite is prepared through roller way slow cooling, the content of strengthening elements can be increased without weakening the toughness of the material, the material cost is considered, the tensile strength is 1692-1735 MPa, the percentage reduction of area is 25%-30%, and the tensile strength of the steel wire rod is 1692-1735 MPa. The method is used for the application field of manufacturing of 2500 MPa-grade ultrahigh-strength bridge cables and the like, and the wire breaking risk in the drawing and twisting process can be reduced easily.

The invention relates to a hot-rolled wire rod for a 1960MPa-grade bridge cable and a manufacturing method of the hot-rolled wire rod, after a C-Si-Mn-Cr hypereutectoid component is rolled and spun into a wire rod, the wire rod is subjected to online molten salt strong isothermal treatment, so that the wire rod firstly passes through front-section molten salt and is cooled at a cooling speed of more than or equal to 36 DEG C / s, and enters a sorbite phase region from an austenite state to promote transformation of part of austenite to sorbite; the method comprises the following steps: carrying out high-temperature heat treatment on a steel wire rod, then carrying out rear-section molten salt heating isothermal treatment to promote pearlite phase change and isothermal tempering, and finally carrying out roller way slow cooling to prepare a mixed structure with a microscopic structure mainly comprising tempered sorbite and tempered pearlite and the balance of ferrite and quasi-spheroidized carbide, so that a component system can be simplified, the structure of the steel wire rod is regulated to be uniform, and the service life of the steel wire rod is prolonged. The tensile strength is 1360-1410 MPa, the percentage reduction of area is 45%-50%, the requirement for the strength grade of a 1960 MPa bridge cable is met, and meanwhile the risks of wire breakage and unqualified torsion of manufactured wires are reduced.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2100MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod, after a C-Si-Mn-Cr-Mo high-carbon component system is rolled and spun into a wire rod, the wire rod is subjected to online molten salt strong quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is cooled at a cooling speed of greater than or equal to 33 DEG C / s, and enters a bainite phase region from an austenite state; the method comprises the following steps: firstly, carrying out first-stage molten salt treatment to promote transformation of austenite into bainite, then carrying out later-stage molten salt treatment to form a structure mainly comprising bainite, carrying out isothermal tempering on the structure, reserving part of untransformed retained austenite, and finally, carrying out roller way slow cooling to promote transformation of the untransformed retained austenite into martensite, and carrying out tempering, the microstructure of the hot-rolled wire rod comprises a complex-phase structure composed of tempered bainite and tempered martensite, the tensile strength of the hot-rolled wire rod can reach 1435-1485 MPa, the percentage reduction of area of the hot-rolled wire rod is 31%-36%, off-line heat treatment of follow-up machining is avoided, and the risk of wire breakage is reduced.

The invention relates to a hot-rolled V-containing high-strength wire rod for a 1860MPa-grade bridge cable and a manufacturing method thereof.After a C-Si-Mn-Cr-V hypereutectoid component system is adopted for rolling and spinning to form a wire rod, online molten salt isothermal weak tempering treatment is conducted, the wire rod passes through front-section molten salt and is cooled at the cooling speed larger than or equal to 35 DEG C / s, the wire rod enters a sorbite phase region from an austenite state, and then the wire rod is cooled at the cooling speed larger than or equal to 35 DEG C / s; the preparation method comprises the following steps of: forming a structure taking sorbite as the main part, then promoting isothermal tempering and sorbite lamellar fusing of the structure through rear-section molten salt heating, and finally, slowly cooling through a roller way to prepare a microscopic structure which takes tempered sorbite as the main part and is a mixed structure consisting of ferrite and fused sorbite, so that the problems of network carbides and hard and brittle structures can be improved; and the structure uniformity and the strength and plasticity matching of the large-specification wire rod are improved, the tensile strength is 1340-1390 MPa, the percentage reduction of area is 38%-43%, and the steel wire rod can be used for manufacturing 1860 MPa bridge cables and meets the wire manufacturing and twisting requirements.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2060MPa-grade stranded wire and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After high-carbon chemical components containing trace V are designed, rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 33 DEG C / s through on-line molten salt semi-quenching treatment, enters a bainite and pearlite mixed phase region from an austenite state, and is subjected to hot rolling and hot rolling at a cooling speed of more than or equal to 33 DEG C / s; the method comprises the following steps: quenching bainite and a sorbite structure to form a structure mainly comprising the quenched bainite and the sorbite structure, then carrying out isothermal tempering, and finally carrying out roller way slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered sorbite and tempered bainite, so that a component system can be simplified, the material cost can be reduced, network carbides can be effectively controlled, and meanwhile, the complex-phase structure can be regulated and controlled; the high strength and plasticity of the wire rod are matched, the tensile strength is 1390-1440 MPa, the percentage reduction of area is 32%-37%, and the steel wire rod is used for manufacturing 2060 MPa grade stranded wires and other application fields and is beneficial to downstream wire drawing and twisting processing.

The invention belongs to but is not limited to the technical field of aluminum alloy preparation, and discloses a high-plasticity aluminum alloy prepared from secondary aluminum and a preparation method, high-quality secondary aluminum waste is selected, and obvious impurities are removed; carrying out chemical or mechanical cleaning on the secondary aluminum, and sorting; the pretreated secondary aluminum waste is added into a smelting furnace to be smelted; a purifying agent is added for melt purification; the melt is further purified through inert gas stirring and standing; adding a proper amount of alloy elements into the melt; under the protection of inert gas, uniformly stirring the melt; casting the melt into a cast ingot by adopting a semi-continuous casting or continuous casting process; controlling the cooling speed; carrying out homogenizing heat treatment on the cast ingot to eliminate composition segregation in the cast ingot; and extruding and rolling to obtain the high-plasticity aluminum alloy material. According to the method, the purity of the aluminum alloy is improved, the performance uniformity is enhanced, and the aluminum alloy material with high plasticity and excellent mechanical performance is obtained and is suitable for industrial application with high requirements.

The invention relates to the technical field of conveying equipment, and particularly discloses a conveying device for rice wine production, which comprises a rack, the rack is provided with a conveying assembly, scattering mechanisms and a cleaning mechanism, each group of scattering mechanism comprises a rotating shaft, a driving assembly, a scattering assembly and a driving structure I. The driving assembly is used for driving the rotating shaft to rotate, and the number of the scattering assemblies is two. Each scattering assembly comprises a plurality of scattering rods, each scattering rod is perpendicular to the axial direction of the rotating shaft and is in sliding fit with the rotating shaft in the radial direction of the rotating shaft, the first driving structure is used for driving the scattering rods to move in the radial direction of the rotating shaft, the cleaning mechanism comprises a first scraping plate, and the end of the first scraping plate makes contact with the peripheral side of the rotating shaft; according to the rice cooling device, gathered rice can be scattered through rotation of the scattering rods, the cooling speed is increased, the rice attached to the outer sides of the scattering rods can be removed through sliding between the scattering rods and the rotating shaft, and meanwhile the rotating shaft can be cleaned through the first scraper blade.

The invention discloses a refrigeration cabinet and an operation control method of the refrigeration cabinet. A weight sensor used for detecting the weight of stored articles and a temperature sensor used for detecting the temperature of a chamber are arranged in the storage chamber of the refrigeration cabinet. When it is detected that the door body is opened, the compressor is controlled to stop running; calculating a weight change value according to the object weight detected by the weight sensor before and after the door body is opened; according to the compartment temperature detected by the temperature sensor, the temperature change rate is calculated; and after it is detected that the door body is closed, the operation state and operation parameters of the compressor are controlled according to the door opening duration of the door body, the weight change value and the temperature change rate. By the adoption of the refrigerator, door opening and closing actions, food material weight changes and compartment temperature changes can be effectively combined to control the rotating speed of the compressor, the cooling speed is increased, and the storage quality of food is improved.

The invention belongs to the technical field of casting, and particularly relates to a process for improving the appearance quality of a casting by using a sand-isolating chilling block, which comprises the following steps: step 1, during molding or core making, firstly paving a layer of molding sand between risers or in a hot spot area; step 2, fixing the chilling block by using molding sand or supporting nails to ensure that the position of the chilling block is stable; 3, sand is discharged to wrap the chilling block, and it is ensured that a sand layer is firm through compaction operation; 4, after the molten steel is poured, heat of the molten steel is conducted to the chilling block through the sand layer, the local cooling speed of the casting is increased, and sequential solidification is achieved; and 5, after pouring, heat preservation is conducted till box opening is conducted, and an intact casting is formed. According to the invention, a layer of molding sand with a specific thickness is placed between the external chilling block and the mold, so that the external chilling block is converted into the sand insulation chilling block, and in order to ensure that the chilling block achieves the effect of process design requirements and can effectively play a chilling role on a casting, the thickness and size of the chilling block and the thickness of a sand insulation layer can be properly adjusted according to the size of a hot spot of the casting.

The invention relates to the technical field of steel for agricultural machinery, in particular to low-yield-strength impact-resistant steel for a rotary blade of agricultural machinery and a manufacturing method of the low-yield-strength impact-resistant steel. Cr, Nb, B and Re are used for alloying, meanwhile, the technological parameters such as casting blank heating, rough and finish rolling descaling pressure, the rolling temperature, the reduction rate, the coiling temperature and the cooling speed are controlled, and the prepared steel for the agricultural machine rotary blade is low in yield strength and good in punch forming performance; the yield strength of the agricultural machine rotary blade part produced by using the composite material is 300-400MPa, the tensile strength is 700-800MPa, and the ductility is greater than or equal to 18%; after heat treatment, the yield strength is 1400 MPa or above, the tensile strength is 1900 MPa or above, the ductility is larger than or equal to 10%, the impact energy AKv at the temperature of 20 DEG C is larger than or equal to 25 J, the hardness is 53 HRC or above, the wear-resisting life is prolonged by two times or above, and the service life is obviously prolonged.

The invention relates to a hot-rolled wire rod for a 2100MPa-grade stranded wire and a manufacturing method thereof, after a high-carbon and high-silicon component system is rolled and spun into a wire rod, the wire rod is cooled at a cooling speed of more than or equal to 31 DEG C / s through online molten salt sorbite regulation and control treatment, and enters a sorbite phase region from an austenite state; the method comprises the following steps of: forming a structure mainly comprising a sorbite structure, performing isothermal tempering, promoting fusing of a part of sorbite lamellas, and finally performing roller way cover opening and slow cooling to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, so that alloy components can be simplified, and the strong plasticity matching and the structure uniformity of the wire rod can be improved; the tensile strength is 1420-1470 MPa, the percentage reduction of area is 36%-41%, the composite material is used for the application field of manufacturing 2100 MPa grade stranded wires and the like, off-line heat treatment can be avoided, and the risk of wire breakage during downstream drawing and twisting is reduced.

The invention provides a welding tool for an automobile rear auxiliary frame cross beam, and belongs to the technical field of automobile cross beam welding, the welding tool comprises a base, a rear auxiliary frame main body, an operation table and a welding robot, and the operation table and the welding robot are arranged on the base, and the welding tool further comprises a positioning splicing assembly and a flow guide destressing assembly; protective gas is integrated on the third clamping jaw, the third clamping jaw can effectively guide protective gas flow to a welding seam while fixing the side cross beam, and effective flow guide of the protective gas can be achieved in cooperation with arrangement of the movable spraying pipe; during welding, the impeller is static to block gas, the flow speed is reduced, welding fluid is prevented from splashing and losing due to overlarge airflow impact, and stable combustion of welding arcs is maintained; in the cooling stage after welding is completed, the inductor controls the electromagnetic base to be powered off, gas flow is increased, the cooling speed is increased, meanwhile, vibration is generated to be matched with cooling to eliminate welding residual stress, the stability and reliability of a weldment are improved, the production period can be shortened, and the production efficiency is improved.

The invention relates to a hot-rolled wire rod for a 2060MPa bridge cable and a manufacturing method of the hot-rolled wire rod, after C-Si-Mn-Cr-V-Nb component is rolled and spun into a wire rod, the wire rod is subjected to online molten salt strong isothermal treatment, so that the wire rod is cooled at a cooling speed of greater than or equal to 34 DEG C / s, and enters a sorbite phase region from an austenite state to form a structure mainly comprising fine lamellar spacing sorbite, and isothermal treatment is carried out; and finally, through roller way slow cooling, the hot-rolled wire rod with a microscopic structure mainly comprising tempered sorbite and the balance being a mixed structure composed of ferrite and microspheroidized carbide is prepared, a deteriorated structure influencing the performance of a wire rod finished product in the production process can be effectively controlled, stable production is achieved, and the strength and plasticity matching of the wire rod is improved. The tensile strength is 1440-1490 MPa, the percentage reduction of area is 42%-46%, and the method is suitable for efficient and stable production and manufacturing of the 2060 MPa bridge cable.

The invention relates to the technical field of pump valve production equipment, in particular to a pump valve casting rapid cooling device which comprises an inner barrel with supporting legs and a liquid discharging pipe at the bottom, a water barrel internally provided with a cavity is connected to the outer portion of the inner barrel, a lifting frame is arranged in the inner barrel in a sliding mode, and a driving piece I used for driving the lifting frame to ascend and descend is installed on the inner wall of the inner barrel. A lower die is installed on the top of the lifting frame, a lifting mechanism is arranged on the top of the lifting frame, an upper die is installed on the lifting mechanism, a driving mechanism is arranged outside the inner cylinder, two cylinder covers capable of being opened and closed are arranged on the driving mechanism, and a cooling mechanism is arranged on the inner cylinder. When the temperature of the lower die and the upper die is too high, external air can be supplied to carry out air cooling on the lower die and the upper die in advance, and after the temperature of the lower die and the upper die is reduced to a certain level, cooling water is supplied to carry out water cooling on the lower die and the upper die, so that the cooling safety and efficiency can be guaranteed, and the production efficiency is improved. And the risk of casting cracking or deformation caused by too high cooling speed can be reduced.

The invention discloses a production method of 700MPa-grade high-strength weathering steel. The production method comprises the following steps: smelting and continuous casting production process flow: molten iron pretreatment, converter treatment, LF (ladle furnace) refining and machine casting; the components of the molten steel for the casting machine in percentage by mass are limited; according to the hot rolling production technological process, the casting blank tapping temperature is 1230 + / -20 DEG C, the finish rolling temperature of finish rolling is 890 + / -10 DEG C, the cooling speed is 10-20 DEG C / S, and the thickness of a hot rolled steel strip is 2.5-3.5 mm; laminar cooling equipment is adopted for cooling, a pre-dispersion cooling mode is adopted, and the coiling temperature is 640 + / -10 DEG C. A conventional C, S, i and Mn component system design is adopted, the content of corrosion-resistant alloy elements is properly reduced by adding corrosion-resistant elements Cu, Cr and Ni, the production cost is reduced, and meanwhile good performance is achieved.

The invention relates to a hot-rolled wire rod for a 1960MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after high-carbon components of C-Si-Mn-Cr-B are rolled and spun into a wire rod, the wire rod is subjected to rapid online molten salt isothermal treatment, and the wire rod is subjected to front-section molten salt treatment, so that the wire rod is cooled at the cooling speed of more than or equal to 32 DEG C / s and enters a sorbite phase region from an austenite state; the steel wire rod is subjected to rear-section molten salt treatment, the molten salt temperature is reduced, unconverted retained austenite is promoted to be converted into the sorbite structure, meanwhile, isothermal tempering of the structure and fusing of a part of sorbite lamellas are promoted, and finally slow cooling is conducted through a roller way; the microstructure of the hot-rolled wire rod comprises a mixed structure composed of tempered sorbite, ferrite and fused sorbite, the tensile strength is 1305-1355 MPa, the percentage reduction of area is 37%-42%, and the hot-rolled wire rod is used for being used as base metal to manufacture high-strength stranded wires and other application fields and is beneficial to reducing the risk of wire breakage.

The invention relates to a high-strength polyethylene wrapping film, which is composed of an ABCBC five-layer composite structure, the A layer comprises linear low-density polyethylene, tackifying master batch and an elastomer; the layer B comprises linear low-density polyethylene, metallocene polyethylene and low-density polyethylene; and the layer C is made of linear low-density polyethylene. By optimizing the ratio of the linear low-density polyethylene to the additive among the layers, the vacuum degree of the preparation process and the cooling speed of the molten adhesive film on a cooling roller are improved, and the longitudinal and transverse tensile strength of the prepared polyethylene film is superior to that of the existing film. The prepared high-strength polyethylene wrapping film can be used in the field of heavy object packaging.

The invention discloses a welding deformation pre-control device of an H-shaped steel assembling, welding and correcting all-in-one machine, and relates to the technical field of H-shaped steel welding, the welding deformation pre-control device comprises a welding table and a workpiece, and further comprises a deformation pre-control mechanism connected with the welding table and used for performing deformation control on the workpiece before welding; the deformation pre-control mechanism is installed to pre-control a wing plate and a web plate before welding, deformation of the wing plate and the web plate is controlled in the welding process, correction is not needed through pre-control over the web plate and the wing plate, and the H-shaped steel machining efficiency and the H-shaped steel machining quality are improved; the upper pressing combination mode is changed by installing the web side pressing limiting mechanism, pressure is applied from the side face, the workpiece machining stability is guaranteed in the welding process, the situation that a workpiece inclines due to upper pressing is avoided, and the workpiece machining quality is guaranteed; and heat generated in the welding process is reduced by installing the staggered welding mechanism, the deformation amplitude is reduced, the cooling speed is increased, and the machining efficiency is improved.

The invention discloses an amorphous alloy transformer with a buffer protection function, and relates to the technical field of transformers, a plurality of protection springs are installed at the bottom end of the inner side of an outer fixing integration box at equal intervals, an inner fixing treatment box is fixed to the top ends of the protection springs, and a top sealing fixing plate is fixed to the top end of the inner fixing treatment box; the fixed dampers are symmetrically installed at the bottom end of the inner side of the outer fixed integration box, and the elastic rubber blocks are installed at the top ends of the fixed dampers. The problems that in the prior art, due to factors such as magnetic field changes, electromagnetic force imbalance and uneven cooling speeds of silicon steel sheets and windings, equipment generates large-amplitude vibration and noise are effectively solved; according to the invention, the equipment is prevented from generating resonance reaction due to the influence of vibration and noise, so that the protection treatment of transformer parts is realized, the damage speed of the parts is reduced, the circulating cooling and the three-section linkage cooling are matched, the temperature of the transformer during continuous operation is effectively reduced, and the service life of the transformer during operation is prolonged.

To provide a quenching simulation method for steel with high accuracy.SOLUTION: Provided is a quenching simulation method for steel, comprising: a calculation section 1 calculating a distribution of temperatures by a heat conduction analysis using a finite element method after inputting each of steel phases and physical properties at each of steel temperatures to separate a shape model; a calculation section 2 calculating distribution of strain or stress by an elastoplastic analysis; a calculation section 3 calculating distribution of phase fraction through calculation of a basic equation representing phase transformation; and a calculation section 4 calculating distribution of cooling speed from time change of temperature of each of elements, the method comprising a step of carrying out coupled analysis using phase transformation parameters of the steel calculated from the cooling speed calculated with the calculation section 4 on a procedure to calculate the phase fraction in the calculation section 3.SELECTED DRAWING: Figure 1

The invention relates to the technical field of dust removal, temperature reduction and cooling, and discloses an intelligent water mist dust removal, temperature reduction and cooling control method and system fused with machine vision, and the method comprises the steps: collecting and fusing image data through a multi-mode visual perception module, and recognizing a key region; constructing a neural ejection field by using an implicit neural representation technology; developing a water mist diffusion prediction model based on the conditional generative adversarial network; pID control and reinforcement learning are combined to realize parameter adaptive optimization; visualizing a preview effect by adopting a neural rendering technology; according to the system, accurate identification and positioning of a dust high-temperature area are achieved, the water resource utilization rate and the cooling speed are improved, centimeter-level spraying precision is achieved, control delay is reduced, energy consumption is reduced, and the technical problems of blind spraying, inaccurate control and response lag of a traditional system are solved.

Titanium-based composite powder is used as a raw material, the titanium-based composite powder takes titanium or a titanium alloy as a titanium matrix and takes TiBw or TiC as a reinforcing phase, and the mass ratio of the TiBw or TiC reinforcing phase in the titanium-based composite powder is 1 wt.%-5 wt.%; tiBw or TiC reinforcement bodies in the formed heterostructure titanium-based composite material are distributed in titanium-based composite powder in a net-shaped structure along a Ti matrix grain boundary, a reinforcement phase in the composite material has a nanoscale, and matrix grains have an obvious coarse and fine grain heterostructure. The invention further discloses a preparation method of the material, according to the preparation method, different grain sizes are caused by different cooling speeds of powder with different grain sizes, a low-temperature and high-pressure spark plasma sintering process is combined, the material is prepared under the conditions that grains and a reinforced phase do not grow up at a low temperature and are densified at a high pressure, the preparation process is simple, and the cost is low. The preparation method is also suitable for preparation of other alloys.

The invention discloses a carburizing and quenching process of a thin-wall gear and a clamping tool of the thin-wall gear. The carburizing and quenching process comprises process parameters of temperature, time, flow, carbon potential, cooling speed and the like in stages of pre-cleaning, pre-oxidation, preheating, strong carburizing, diffusion, cooling, quenching, tempering and the like. It needs to be explained that in the technical process, the purpose of reducing the heat treatment deformation quantity of the thin-wall gear is achieved by optimizing the hanging and clamping mode of the thin-wall gear and improving the temperature and time parameters during carburizing and quenching in the scheme. Besides, a clamping tool suitable for the process is designed in the scheme, so that the clamping stability of the thin-wall gear during carburizing and quenching treatment is improved, and the heat treatment deformation quantity of the thin-wall gear is further reduced.

The invention discloses an intelligent adjustment method and system for a computer cooling fan, and relates to the technical field of computer fan adjustment, a computer host temperature area is divided, a defined area set is output, the defined area set is collected, the temperature of each temperature area is obtained, and first temperature data is output; defining a global target temperature; establishing a model to obtain a global fan control signal and a weighted average temperature; calculating a total cooling speed after secondary acquisition; comparing the total cooling speed with an ideal value; by accurately dividing and monitoring the temperature area of the computer host and intelligently adjusting the rotating speed and angle of the fan, the heat dissipation efficiency is remarkably improved, the local temperature is prevented from being too high, the internal components of the equipment are protected, the service life is prolonged, the performance and stability of the equipment under high load are improved, the operation cost is reduced, and the service life of the equipment is prolonged. And the method accords with the green and energy-saving development trend and has an important application value.

The invention discloses a fire-fighting water storage tank welding auxiliary device, and relates to the technical field of fire-fighting water storage tank processing, the fire-fighting water storage tank welding auxiliary device comprises a base, an outer stabilizing mechanism, an inner stabilizing mechanism and a horizontal adjusting seat installed on an external supporting device, the base is provided with a supporting mechanism, and the horizontal adjusting seat is provided with the outer stabilizing mechanism and the inner stabilizing mechanism; the outer stabilizing mechanism and the inner stabilizing mechanism are each provided with an anti-deformation mechanism and a welding head. Through cooperation of the bearing assembly, the side supporting assembly and the second side supporting piece, the water storage tank body and the sealing cover piece can be adaptively borne and supported during welding, and the welding efficiency and stability are improved; through a multi-point supporting structure, the stability of a welding head during welding is improved, and the problem that a welding seam is discontinuous is solved; the temperature of the front welding area and the temperature of the rear welding area are properly increased, the cooling speed can be reduced, the shrinkage difference caused by rapid cooling is reduced, residual stress generated in the welding process is released, and the deformation risk is reduced.

The utility model discloses a laser welding device with a shielding gas heating function, which comprises a laser welding module, a shielding gas heating module is arranged on one side of the laser welding module, the shielding gas heating module comprises a cavity, the cavity is provided with a gas inlet and a gas outlet, a heating rod is arranged in the cavity, and the shielding gas heating module is arranged in the cavity. The air outlet is connected with an air supply pipe, and an outlet of the air supply pipe is arranged below a laser vibration mirror of the laser welding module. According to the utility model, nitrogen reaching a working procedure can be heated in advance, so that the consistency of the temperature of protective gas is ensured; and meanwhile, the shielding gas heating device has a temperature adjustable and controllable function, and the optimal temperature of the shielding gas can be confirmed by discussing the influence of the shielding gas at different temperatures on gas holes and cracks after welding, so that the cooling speed after welding is slowed down, the gas escapes from a molten pool, the probability of generating the welding cracks and the gas holes is reduced, and the welding quality is improved.

The invention relates to a high-strength complex-phase hot-rolled wire rod for a 2400 MPa bridge cable and a manufacturing method of the high-strength complex-phase hot-rolled wire rod. After high-carbon chemical components of Mo-Al-V are rolled and spun into a wire rod, the wire rod is subjected to online molten salt tail end quenching toughening treatment, so that the wire rod passes through front-section molten salt and is cooled at the cooling speed of more than or equal to 35 DEG C / s, part of austenite structures are transformed into quenched martensite, and the quenched martensite structure is cooled at the cooling speed of more than or equal to 35 DEG C / s; the method comprises the following steps of: heating to the temperature of a sorbite phase region through rear-section molten salt, controlling unconverted austenite to be converted into sorbite, carrying out isothermal tempering, and finally, slowly cooling through a roller way to prepare a hot-rolled wire rod of which the microscopic structure comprises a complex-phase structure consisting of tempered martensite and tempered sorbite, so that the control of network carbide and other hard and brittle phase structures can be realized, and the service life of the hot-rolled wire rod is prolonged. According to the steel wire rod, the strength and the structure uniformity of the steel wire rod are improved, the material cost and good plasticity are both considered, the tensile strength is 1665-1705MPa, the percentage reduction of area is 26%-31%, the production efficiency is high, and stable production of 2400 MPa bridge cables is facilitated.

The invention provides a 700MPa-grade high-strength anti-seismic reinforcing steel bar and a production method thereof. The reinforcing steel bar comprises 0.24-0.28% of C, 0.50-0.80% of Si, 1.20-1.60% of Mn, 0.165-0.200% of V, 0.025-0.050% of Nb, 0.026-0.040% of N, [Nb] + [V] < = 0.23%, [V] / [N] < = 6.35, [C] + [N] < = 0.31%, ([Nb] + [V]) / ([C] + [N]) < = 0.67%, carbon equivalent Ceq < = 0.57% and the balance of iron and impurities. In the production method, the temperature of a soaking zone is 1255-1300 DEG C; water cooling is not adopted in the rolling process; and after rolling is completed, cooling to room temperature in air, the temperature on a cooling bed is larger than or equal to 1125 DEG C, and the cooling speed during natural cooling is smaller than 1 DEG C / s.

The invention discloses a construction method of a building steel structure project, which relates to the technical field of steel structures and comprises the following steps of material preparation, arrangement before construction, steel structure preheating, welding energy control, evaluation of heat absorbed by a weld joint in unit length by using a welding heat input algorithm, comprehensive evaluation, and construction of the steel structure project after welding is completed. The welding seam quality is evaluated by utilizing a comprehensive evaluation algorithm and combining welding line energy to obtain a welding seam score and welding seam finishing, the welding seam preheating temperature can be adjusted according to different steel properties and welding modes, the accuracy of the welding seam preheating temperature is guaranteed, different influence factors are introduced into a welding heat input algorithm, and the welding quality is improved. And in a comprehensive evaluation algorithm, factors such as the cooling speed of the welding line, the welding line energy and the welding line area are combined for evaluation, the unified standard of welding line quality evaluation is achieved, and the effect of improving the overall quality of a steel structure project is achieved.

The utility model provides a hot galvanizing strip steel edge heating device, and relates to the technical field of hot galvanizing strip steel production, the hot galvanizing strip steel edge heating device comprises a shell, strip steel, an air supply assembly and two air knives, the strip steel penetrates through the shell, and the left side and the right side of the strip steel are each provided with a heating assembly, a first adjusting assembly and a second adjusting assembly; by arranging the heating assembly, the cooling speed of the strip steel edge coating can be slowed down, so that the phenomenon that the strip steel edge coating is too thick is prevented, the strip steel quality is guaranteed, the heating assembly can heat the strip steel edge from the upper side and the lower side at the same time, the heating uniformity is improved, and the heating effect is improved; by arranging the first adjusting assembly, the distance between the first air outlet pipe and the second air outlet pipe can be adjusted according to actual use requirements so as to adapt to strip steel of different thicknesses, and the use stability is improved; and by arranging the second adjusting assembly, the distance between the two heating assemblies located on the left side and the right side of the strip steel can be adjusted according to actual use requirements so as to adapt to the strip steel with different widths, and the use stability is improved.