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440 results about "Welding residual stress" patented technology
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Residual stress in welding is mainly the result of thermal expansion, which in basic terms means that materials expand or contract with temperature.
Method for measuring welding residual stress
InactiveCN101539506AReduce additional stressIntegrity guaranteedUsing mechanical meansMaterial analysisThick plateWelding residual stress
The invention relates to a method for measuring welding residual stress-a partial layer-by-layer blind hole removing method for measuring the residual stress on the basis of a blind hole method, which proposes to measure the residual stress in a component by using the partial layer-by-layer blind hole removing method. After materials of certain depth on both the front side and the opposite side of a component to be measured are partially removed, the blind hole method is used for measuring the residual stress. The method is a semi-destructive residual stress measuring method, can be used for carrying out multi-point measurement and measuring the residual stress in the component with severe stress change and has convenient operation and high measuring efficiency. Proved by a thick plate carbon steel welding residual stress measuring test, the method has more accurate measuring results.
Owner:XI AN JIAOTONG UNIV
Method and tooling for controlling deformation of nickel-based ageing-strengthening high-temperature alloy casing welding assembly
ActiveCN103551770AAvoid fatigue crackingMeet reliabilityWelding/cutting auxillary devicesAuxillary welding devicesWelding residual stressElectron
Owner:SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
ABAQUS-based finite element simulation method of correcting welding deformation through ultrasonic shot-peening
The invention discloses an ABAQUS-based finite element simulation method of correcting welding deformation through ultrasonic shot-peening. The method includes: firstly, utilizing the finite element software ABAQUS to simulate the welding process of a certain-sized aluminum alloy sheet to obtain the distribution of the welding residual stress and the deformation;and secondly, reading in a stress force and deformation grid and performing the simulative computation of a shot-peening shape correction process on the basis of the welding stress and deformation. The ABAQUS-based finite element simulation method of correcting the welding deformation through the ultrasonic shot-peening takes the limits that the complexity of mechanism of the shot-peening process and the influence of various variable factors result in great difficulties in optimizing shot-peening process parameters and the method which purely relies on experimental data and experience consumes much time and money into consideration, so that the ABAQUS-based finite element simulation method is introduced to assist the selection of the ultrasonic shot-peening process parameters and the strain of the stress and the change of the deformation are analyzed to explain the mechanism of the shape correction.
Owner:TIANJIN UNIV
Wall board creep age forming method based on finite element mould profile rebound compensation
ActiveCN102930115AReduce auto-optimizationExtended service lifeSpecial data processing applicationsRepair timeWelding residual stress
The invention belongs to the technical field of metal plate forming, and relates to a wall board creep age forming method based on finite element mould profile rebound compensation. By the wall board creep age forming method, a finite element method is used for determining a mould profile, technological tests and mould repairing times are largely reduced, appearance control of formed parts can be realized, and forming precision is improved; according to the data through analog computation of forming process and rebound process of a formed piece, the mould profile is compensated, revised and optimized, so that rebound parts are the same as or close to the appearance of an ideal formed piece, and automatic optimization to the mould appearance during a creep age forming process is realized. The forming method can be applicable to various wallboard structures; except for overall wallboard parts, the forming method can be used for welding overall wallboards; welding residual stress can be effectively reduced, stress corrosion resistance capability is enhanced, and service lives of parts are prolonged.
Owner:BEIJING AERONAUTICAL MFG TECH RES INST
Submerged-arc welding process for T-type joint for extra thick steel plate
ActiveCN102240841AImprove welding qualityReduce the deterioration of mechanical propertiesArc welding apparatusCrazingThick plate
The invention discloses a submerged-arc welding process for a T-type joint for an extra thick steel plate and belongs to the technical field of welding of extra thick plates. The process comprises the following steps of: before welding, pre-heating the extra thick steel plate to 100 to 150 DEG C; removing pollutants of oxides, greasy dirt and the like on the surface of the groove of the extra thick steel plate; bottoming the extra thick steel plate by submerged-arc welding; forming systematical grooves and after the front face of the extra thick steel plate is bottomed, welding and filling; performing back gouging on the reverse side of the extra thick steel plate and welding and filling the reverse side; and filling welding wires on the front side of the extra thick steel plate and covering the side. The problems that manual bottoming efficiency is low, labor intensity is high, and heat cracking, undercutting, mechanical slag inclusion, large working amount of back gouging of the reverse side and the like are easily caused by submerged-arc welding bottoming when the T-type joint of the extra thick plate of which the thickness is 50 to 150mm is welded are solved; by the selection of an appropriate groove form, the welding sequence, and welding process parameters, and slow cooling measures, slag is easy to clean in a filling weld pass, the working amount of back gouging is reduced, the welding deformation is reduced, the welding residual stress is reduced and the quality of a weld joint is guaranteed; and the submerged-arc welding process is easy to operate and implement, and is convenient to popularize.
Owner:SHOUGANG CORPORATION
Ultrasonic assistec laser electric arc composite welding method of aluminum alloy
InactiveCN105710537AEfficient weldingPromote escapeWelding/soldering/cutting articlesLaser beam welding apparatusCavitationWelding residual stress
The invention relates to an ultrasonic assisted laser electric arc composite welding method of an aluminum alloy. On the basis of carrying out a welding scheme by combining TIG electric arc welding and laser welding, ultrasonic vibration pressure is introduced into a welding seam, wherein a designed vibration head is in direct contact with the welding seam, so that ultrasonic resources can be more sufficiently utilized, and gas in the welding seam can be rapidly escaped; most of gas in the welding seam is removed so that welding seam gas pore defects are reduced or avoided; tissue crystal grains of the welding seam are remarkably refined by utilizing cavitation effect and acoustic streaming effect caused by the fact that ultrasonic waves are transmitted in liquid, and furthermore, tissue alloy elements of the welding seam are more uniform, segregation is reduced, the strength and corrosion resistance performance of the welding seam are improved, and the performance of a welding connector is improved; and welding residual stress is effectively eliminated or reduced and the strength and corrosion resistance performance of the connector are enhanced, so that the efficient welding of the aluminum alloy is realized.
Owner:北京隆源自动成型系统有限公司
Self-diagnosis system for wind-induced cumulative fatigue damage of pull lug node substructure of mast structure
InactiveCN101825522AEnsure safetyMaterial analysis using acoustic emission techniquesForce measurementFatigue damageReal time analysis
The invention discloses a self-diagnosis system for wind-induced cumulative fatigue damages of a pull lug node substructure of a mast structure. The system comprises a displacement measuring apparatus, a pull rope tension determination module, a welding residual stress determination module, a pull lug substructure wind-induced stress field determination module, a fatigue crack initiation degree real-time analysis module and a man-machine interaction interface, so that the system can timely inform a user of the degree of the cumulative fatigue at the danger point position of the pull lug node substructure of the mast structure and the time when the cumulative fatigue crack initiation occurs and make early warning on cumulative fatigue cracks when the pull lug node substructure of the mast structure is in a good condition. In addition, the system also comprises an acoustic emission sensor, a strain transducer, a fatigue crack growth determination module and an ultimate crack length and fracture analysis module, so that the system can timely inform the user of the degree of the cumulative fatigue crack growth and the time when the fracture occurs, timely repair the crack and ensure the safety of the mast structure when the cumulative fatigue cracks of pull lug node substructure of the mast structure occur.
Owner:WUHAN UNIV OF TECH
Welding microcell performance test based residual stress computing method
InactiveCN102759504AReduce mistakesAccurate calculationUsing mechanical meansMaterial analysisBacksteppingElement model
The invention provides a welding microcell performance test based residual stress detection method, which comprises the following steps of: carrying out a micro-compression-shear test on a welding microcell so as to obtain a load-displacement curve of the welding microcell, establishing a 3D (three-dimensional) finite element model of a micro-compression-shear test process, and carrying out a finite element reverse backstepping method based on an improved Gurson model so as to obtain a true stress-strain relation of the welding microcell; computing the welding residual stress, wherein in the process of carrying out computing on a welding temperature field, the influence of the mechanical property of the welding microcell on the change of the temperature field is not considered; and after the welding temperature field is obtained, in the process of carrying out computing on a welding stress field, taking normal-temperature mechanical property parameters (when the temperature of a weldment is reduced according to the true stress-strain relation of the welding microcell) into a welding computing model, and then obtaining the welding residual stress through computing. The accuracy of the method disclosed by the invention is higher than that of a result obtained by using a residual stress computing method which is implemented through not considering the mechanical property of the welding microcell.
Owner:XI AN JIAOTONG UNIV
Catalytic converter assembly welding method for vehicle exhaust system
ActiveCN103464912ASimple structureImprove accessibilityWelding/cutting auxillary devicesAuxillary welding devicesWelding residual stressWelding deformation
A catalytic converter assembly welding method for a vehicle exhaust system uses incremental part welding and includes the following steps of welding a front cone, a carrier shell and a rear cone on carrier shell subassembly welding equipment to form carrier shell subassembly, welding a front flange, a front connection tube, a middle connection tube, and the welded carrier shell subassembly on a front subassembly welding equipment to form a front subassembly, and welding flexible connection, a rear connection tube, a rear flange and the front subassembly on assembly welding equipment so as to form a catalytic converter assembly. The catalytic converter assembly welding method for the vehicle exhaust system has the advantages of greatly reducing cumulative welding residual stress caused by integrated welding and forming, avoiding deformation of complex welding on junctions of various part, improving product quality, eliminating quality problems caused by welding residual stress and a large of unqualified products owing to the welding deformation, and improving production efficiency.
Owner:保定市屹马汽车配件制造有限公司
Methods for repairing gas turbine engine components
ActiveUS7244320B2Minimizing post-weld residual stressFurnace typesHeat treatment furnacesWelding residual stressEngineering
Systems and methods for repairing Thermo-Span® gas turbine engine components are described herein. Embodiments of these methods minimize post-weld residual stresses in a weld repaired Thermo-Span® component by solution heat treating the component by heating the component to about 2000° F.±25° F., holding the component at about 2000° F.±25° F. for about one hour; and cooling the component to below about 700° F. at a rate equivalent to cooling in air; and precipitation heat treating the component by heating the component to about 1325° F.±25° F., holding the component at about 1325° F.±25° F. for about 8 hours, cooling the component to about 1150° F.±25° F. at a maximum rate of about 100° F. / hour, holding the component at about 1150° F.±25° F. for about 8 hours, and cooling the component at a predetermined cooling rate. Dimensions of the fully-machined and weld repaired component are maintained during solution heat treating and precipitation heat treating via custom designed furnace tools.
Owner:RTX CORP
Method for measuring sheet welding residual stress
ActiveCN103808438AHigh measurement accuracyImprove reliabilityForce measurementWelding residual stressEngineering
The invention relates to a method for measuring sheet welding residual stress. The method comprises the steps of sticking two rows of symmetrically distributed resistance strain gages on a weldment at first and enabling the direction of a strain grid to be consistent with the direction of a weld joint, next, cutting the weldment into two parts with the same size in a direction perpendicular to the weld joint so that the residual stress is released, observing and recording the changes of readings of the two groups of strain gages to obtain two groups of strain values released in the direction of the weld joint, and performing numerical value averaging on the obtained two groups of strain values of the two cut surfaces of the weldment, carrying out polynomial fitting through EXCEL, and finally, obtaining an original residual stress distribution curve in the direction of the weld joint through conversion according to Hooke's law. The method has the beneficial effects of high measurement accuracy, multi-point measurement, high reliability, convenient operation and low equipment cost.
Owner:ZHEJIANG UNIV OF TECH
Preparation method for hydraulic pressure composite thermometal oil pipe
InactiveCN105171349AAnti-corrosion and wear-resistantStrong enoughDrilling rodsOther manufacturing equipments/toolsWelding residual stressMaterials science
The invention relates to a preparation method for a hydraulic pressure composite thermometal oil pipe. A carbon steel outer pipe is subjected to abrasive blasting and derusting, and the cleaning of the inner surface of the carbon steel outer pipe and the outer surface of a stainless steel inner pipe is ensured; the inner pipe penetrates into the outer pipe, and hydraulic pressure composite is conducted through a hydraulic press after the penetration is completed; the carbon steel outer pipe is made to deform elastically and the stainless steel inner pipe is made to deform plastically in the composite process, so that the inner pipe and the outer pipe are made to combined closely. After the composite process, pipe end machining is conducted before welding, and eddy current inspection is conducted on the whole oil pipe after the pipe end machining is completed; if the oil pipe is qualified through the inspection, the two pipe ends are subjected to bead welding which is completed through an automatic welder, and the bonding strength of the pipe ends are ensured. Pipe end heat treatment is conducted for removing the residual stress of the welding after the welding is completed. After the stress is removed, coping of a screened pipe and turning of threads are conducted, and inspection is conducted after the turning of threads is completed. Coupling and path opening are conducted after the oil pipe is qualified. The whole inner surface of the product prepared through the preparation method is corrosion resistant, and the corrosion-resistance strength is high; the outer pipe ensures that the strength of the composite oil pipe is enough, so that the stainless steel composite oil pipe has the characteristics of anticorrosion and abrasion resistance. Besides, the cost is low and the service life is long.
Owner:SHANGHAI HILONG CRA LINED STEEL PIPE MFR
Low-alloy high-strength steel welding process
InactiveCN101337298ASolving the Elimination of Welding Residual StressHigh tensile strengthArc welding apparatusWelding/cutting media/materialsWelding residual stressAlloy
The invention discloses a technological method for welding low-alloy high-strength steel, which comprises the following steps: a divided edge is formed, a welding area is polished and cleaned, and the strength of welding material is equivalent to that of steel to be welded; Ar+CO2 mixed gas protective welding is adopted, preheating is performed before welding, and the welding speed is 250-300mm / min; a 800MPa solid welding wire is adopted to perform multilayer multirun welding; the interlayer temperature is kept at 150 DEG C plus or minus 20 DEG C during the welding process, a preheating spray gun is used from time to time for temperature compensation, the welding line energy is 16-18KJ / cm, low temperature aging is performed to the whole after welding, and the temperature is 300-400 DEG C. The welding technological method prevents welding cracks from being generated, eliminates residual stress generated during welding large-sized structural members, and serves the purpose that the tensile strength of weld joins equals the tensile strength of parent metal.
Owner:四川航天神坤装备有限公司
Welding residual stress measuring method based on XJTUOM three-dimensional optical surface scanning and measuring system
InactiveCN104374499AEasy to operateImprove measurement efficiencyForce measurement by measuring optical property variationUsing optical meansStress distributionExperimental methods
The invention discloses a welding residual stress measuring method based on an XJTUOM three-dimensional optical surface scanning and measuring system. According to the method, on the basis of an original small-hole method measuring principle, an experimental method is greatly changed, the XJTUOM three-dimensional optical surface scanning system is utilized, different breadth can be quickly measured under an overall coordinate system of a mark point, multi-vision scanning point cloud is automatically spliced to the overall coordinate system of the mark point, workpieces of different accuracy and sizes can be measured, the welding residual stress measuring method is suitable for the workpieces ranging from dozens of millimeters to one hundred meters in size, multi-point measuring can be conducted, the stress distribution states of all measuring points can be analyzed conveniently, and the method is convenient to operate and high in measuring efficiency. Tested by the welding residual stress measuring test of a Q235B thin steel sheet, the method is relatively accurate in measuring result.
Owner:XI AN JIAOTONG UNIV
Self-reset magnetic fluid damper
ActiveCN105064531AForce stabilityEasy to assembleShock proofingWelding residual stressMagnetorheological fluid
The invention discloses a self-reset magnetic fluid damper. The self-reset magnetic fluid damper comprises an outer tube, an inner tube, outer tube inner casing tubes, inner tube outer casing tubes, damper pistons, a magnetorheological fluid, permanent magnets, a magnetism isolating ring, sealing end plates, a left side spring and a right side spring, wherein first bosses are inwards arranged on the inner wall of the middle of the outer tube, outer tube fixing baffles are inwards arranged at two ends of the outer tube and are round baffles provided with round holes formed in the middles, the outer tube inner casting tubes are fixedly arranged on the inner wall of the outer tube between the first bosses and the outer tube fixing baffles, and second bosses are arranged at the ends, close to the first bosses, of the outer tube inner casting tubes. A force is transferred in the inside through the inner tube, the outer tube and the casting tubes, assembly is simple, a welding range is greatly decreased, change of the metallographic structure and mechanical performance of a steel product caused by welding and residual welding stress are avoided, and the stress performance of the members is more stable. The self-reset magnetic fluid damper is convenient to use and has higher reliability.
Owner:BEIJING JIAOTONG UNIV
Method and device for laser peening correction size precision online control for welded metal plate
ActiveCN106216842AAdjust the impact in timeTimely adjustment of the school pathLaser beam welding apparatusWelding residual stressOptoelectronics
The invention provides a method and device for laser peening correction size precision online control for a welded metal plate. A laser machine emits a laser beam, the laser beam is transmitted to a workpiece welding area through a light path system, a water limiting layer covers the welding area, and a limiting layer is formed. Under the action of laser pulse, impulse waves are formed on the welding surface, residual compressive stress is generated in the welded metal plate, and the residual compressive stress is eliminated. Efficiency of laser penning is high, a deep residual compressive stress layer can be generated, size correcting efficiency is high, the size correcting makes the surface and a certain depth range of a peening area of a welded piece to be subjected to plastic deformation, the straightening purpose is achieved, and meanwhile, fatigue strength of a welded joint is improved. According to the method and device for the laser peening correction size precision online control for the welded metal plate, precise size correcting can be conducted on the welded piece, working efficiency is high, controllability is good, and the range of application is wide.
Owner:GUANGDONG UNIV OF TECH
Multi-path high-energy ultrasonic field treatment device for regulating and controlling welding residual stress
ActiveCN103060545AImprove structural strengthImprove corrosion resistanceFurnace typesProcess efficiency improvementHigh energyWelding residual stress
The invention relates to a multi-path high-energy ultrasonic field treatment device for regulating and controlling a welding residual stress. The device sends a control instruction by matching with regulating-controlling system software and via an industrial personal computer; an ultrasonic signal excitation controller receives the control instruction, and then sends a regulating-controlling signal to a high-power ultrasonic amplifier; the high-power ultrasonic amplifier drives a high-energy ultrasonic transducer according to the regulating-controlling signal to generate a high-energy ultrasonic beam; and the energy of the high-energy ultrasonic beam is injected in a residual stress concentrated area in the surrounding of a weld joint according to set requirements, and then is used for regulating the residual stress. The device is simple in structure and good in regulating-controlling effect, can effectively solve the various adverse effects of a residual stress on the dimensional stability, the fatigue strength and the like of a welding workpiece at the present stage, has the characteristics of being efficient, energy-saving, environment-friendly and the like, and is very wide in application prospect.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Method for analog calculation of welding value by taking temperature as control variable
ActiveCN101559511AImprove efficiencySolve accurate controlArc welding apparatusProgramme control in sequence/logic controllersResidual deformationWelding residual stress
The invention relates to a method for analog calculation of a welding value by taking temperature as a control variable, which comprises the following steps: 1) arranging welding temperature field distribution into a function of time and space: T(x, y, z,t)=f(x)f(y)f(z)f(t); 2) taking the obtained temperature distribution function T(x, y, z, t)=f(x)f(y)f(z)f(t) as a thermology boundary condition to add into a mechanics analysis model of a welding structure in a subprogram form; and 3) calculating the welding residual stress and the residual deformation of the model. The method converts the control variable in the welding simulation from heat to temperature, adds the proper temperature distribution in a sectional mode onto the mechanical analysis model for the analysis of stress and deformation, and can reduce the mechanical value analyzing time within 10 percent of the time used by a moving heat source method. The method can be widely used for welding welded structures with long welding lines, multiple welding lines and multiple passes, and has very important function on promotion and reference in projects.
Owner:TSINGHUA UNIV
Extra-thick sheet submerged-arc welding technique
ActiveCN105057856ASmall amount of welding deformationReduce turning timesArc welding apparatusWelding/soldering/cutting articlesThick plateWelding residual stress
The present invention discloses an extra-thick sheet submerged-arc welding technique. The technique comprises the following technological parameters and steps: 1) connector preparation: X-type beveled edges are adopted by extra-thick sheets; 2) preheating: first heating a back side of an extra-thick sheet and then a front side of the extra-thick sheet, a preheating temperature being 150 DEG C to 160 DEG C, and a heating rate being not higher than 105 DEG / h; 3) backing welding: after preheating, using flux-cored wire gas shield welding for backing welding for two paths to form two layers, and using submerged-arc welding to fill at least two paths to form one layer, maintaining interlayer temperature to be not higher than 230 DEG C; 4) turning over after an inter-welding deformation is not larger than 6-8 mm; 5) backside welding: after carbon gouging and back chipping, backing welding according to the step 3) after the extra-thick sheet reaches a preheating requirement according to the preheating method described in the step 2); 6) stress relief treatment; and 7) carrying out post heating treatment at 200 DEG C / 2h after the welding, then slowly cooling the extra-thick sheet to be at the room temperature. With adoption of the technique provided by the present invention, rooting welding deformation is reduced, welding residual stress for subsequently filling a cover face is also reduced, and thus turn-over times in welding of the extra-thick sheet are reduced.
Owner:CHINA MERCHANTS HEAVY IND JIANGSU +1
Butt joint method for super-thick steel plates
ActiveCN104002030AShort cooldownHeat dissipation fastWelding/soldering/cutting articlesMetal working apparatusSheet steelButt joint
The invention discloses a butt joint method for super-thick steel plates. The butt joint method for the super-thick steel plates comprises the steps of: machining grooves at butt joint parts of the steel plates, wherein the grooves are U-shaped grooves with symmetrical two surfaces, the angle of each groove is 8-10 degrees, and the radius of the arc at the root of each groove is 9-11mm; pre-heating before welding, wherein the preheating temperature is 40-60 DEG C, and locating welded joints after preheating; alternatively welding the welded joints on two sides by turning over for many times, backstep welding the layers of welding joints; keeping temperature in a welding process to be not more than 200 DEG C; keeping warm after welding, and cooling slowly. Since the U-shaped grooves are employed, the sectional area of the welded joints are greatly reduced, thermal input is reduced, control on welding deformation is facilitated, welding residual stress is reduced by backstep welding, two sides of the welded joint of the steel plate are subjected to uniform force by turning over for many times in welding, deformation in the welding process is corrected, the super-thick steel plate is rapid in heat dissipation after welding, quality of the welded joint is ensured by the method of keeping warm after welding, and stress deformation can be reduced by slowly cooling.
Owner:中铁宝桥(扬州)有限公司
Method for eliminating welding residual stress by utilizing high-pressure water jet
ActiveCN103805760AGood effectLow costFurnace typesProcess efficiency improvementWelding residual stressEngineering
A method for eliminating the welding residual stress by utilizing high-pressure water jet belongs to technical field of welding. The high-pressure water jet (3) sprayed by a nozzle (1) moves on a weld (4), the axial dynamic pressure of the water jet (3) is adjusted to be 220-700MPa; the distance between the water outlet of the nozzle (1) and the weld (4) is kept to be 5-10mm, the water jet (3) moves back and forth for 4 to 8 times along the weld track and perpendicular to the workpiece surface, and the stress eliminating effect is reinforced. The method for eliminating the welding residual stress is easy to operate, and quickly eliminates the residual stress on the welding part after welding. The stress on the weld in a narrow space can be eliminated, such as dead angle part and repair welding part, and can ensure that the whole weld stress eliminating effect is good, stable and average.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Diffusion connection method of carbide ceramic
InactiveCN103044058AImprove mechanical properties at room temperatureImprove antioxidant capacityWelding residual stressComposite ceramic
A diffusion connection method of carbide ceramic relates to a carbide ceramic welding method. The diffusion connection method aims at solving the problem that when a metal middle layer is used for connecting the carbide ceramic and composite ceramic, a residual metal middle layer is formed in a welded joint, and the structure of the welded joint is inhomogenous. The diffusion connection method comprises the steps of: 1, carrying out surface cleaning; 2, electroplating a Ni metal layer; and 3, welding, thus completing the diffusion connection of the carbide ceramic. The diffusion connection method has the advantages that 1, the welded joint without the residual middle layer and with the homogeneous structure is formed, the welding residual stress caused by the residual middle layer in a common diffusion welding joint is relieved, the room-temperature mechanical property of the welded joint is increased, and the high-temperature mechanical property and oxidation resistance of the welded joint are also increased; and 2, the diffusion connection method is simple and practicable without needing complex working procedures and equipments. The diffusion connection method of the carbide ceramic, provided by the invention, is mainly used for diffusion welding of the carbide ceramic.
Owner:HARBIN INST OF TECH
Argon-arc welding for austenitic stainless steel using water cooling welding method
The invention discloses a water-cooling argon-arc welding method for welding austenitic stainless steel, which is characterized in that: after finishing backing welding at the welding seam of a workpiece, the back of the welding seam is cooled with cold water when filling and cover-welding is carrying out for the welding seem. The invention solves the problems that high welding stress and poor corrosion resistance exist in the prior austenitic stainless steel welding and ensures that the welding seam of the austenitic stainless steel has fine metal crystal grains, uniform structure and small residual welding stress. The invention can not only obtain ideal welding joints but also improve the productive efficiency of welding.
Owner:普瑞特机械制造股份有限公司
Method for eliminating welding residual stress
ActiveCN106555046AOvercoming randomnessOvercome with experienceFurnace typesHeat treatment process controlSurface layerWelding residual stress
The invention discloses a method for eliminating welding residual stress. The method comprises the steps that an X-ray diffraction (XRD) test is conducted on a welding part for surface welding residual stress testing, and welding residual stress surface layer data is obtained; a welding simulation model of the welding part is established, simulation data of the welding residual stress is calculated, and then the distribution law of the welding residual stress of the welding part is finally obtained; numerical simulation calculation of the vibration impact process is conducted by simulating the impact frequency and the impact amplitude on the basis of the distribution law of the welding residual stress, and then vibration impact parameters for eliminating the welding residual stress are obtained; the welding part is clamped in a drivable positioning workbench, the positions of an impact head and a welding part welding joint on the positioning workbench are adjusted, and impact treatment is conducted in the mode that the axis of the impact head arranged on the workbench is perpendicular to the weld joint surface of the welding part according to the impact frequency and impact amplitude which are obtained before. The method has the advantages of being precise, low in energy consumption, good in eliminating effect, high in efficiency and the like.
Owner:BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
Heat treating process of titanium alloy in antivacuum furnace
InactiveCN101423922AOvercoming the Need to Handle Titanium Alloy ProductsFlexible designVacuum pumpingHeat-affected zone
The invention provides a titanium alloy non-vacuum furnace heat treatment process, which comprises four procedures of manufacturing a heat treatment box, placing a work piece in the heat treatment box, vacuum pumping the heat treatment box and performing the heat treatment. By utilizing the process, the surfaces of titanium alloy parts are non oxidation and show the original color before treatment or little golden yellow, the stress of the product is removed by more than 55 percent, and the indexes of the mechanical performances meet the standard requirement. In the process, a titanium alloy welding test plate of which 6 is equal to 20mm, is subjected to annealing heat treatment, and the annealing process is as follows: the plate is heated up to the temperature of 650 DEG C, kept the temperature for 90 minutes and air cooled to room temperature. The welding residual stress of the welding test plate is measured by the blind hole measurement before and after the heat treatment of the welding test plate, the tensile strength of the welding test plate and the impact toughness of a welding seam heat affected zone are also measured before and after the heat treatment of the welding test plate, and the results meet the requirement, thereby solving the problems that a factory is not equipped with the vacuum heat treatment furnace or the production of small batch of products is not worthy of using the large-sized titanium alloy vacuum furnace and increasing yield; moreover, the process also has the advantages of short temperature rise time, short processing period, high yield and reliable product quality of products.
Owner:725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
Error correction method of welding residual stress ultrasonic measurement
ActiveCN105004789AImprove test accuracyGood for thermal simulationAnalysing solids using sonic/ultrasonic/infrasonic wavesForce measurementWelding residual stressCorrection method
The invention discloses an error correction method of welding residual stress ultrasonic measurement. The method comprises A, preparing a welded test plate 1 and a welded test plate 2 from a mother material plate of a welded test piece to be detected, B, taking an arcing region sample, a stable region sample and an arc suppression region sample from the welded test plate 1, subdividing the samples according to microstructural difference, and labeling welding feature points, C, labeling welding feature points at corresponding positions of the welded test plate 2, and acquiring a thermal cycle curve by the labeling welding feature points of the welded test plate 2, D, preparing a thermal simulation block E by the thermal cycle curve, E, according to mother material small block and thermal simulation block residual stress measured by an ultrasonic method and a sectioning method, determining a residual stress corrected value, F, according to the residual stress corrected value, correcting an ultrasonic measurement residual stress measured value so that an accurate residual stress value of the welded piece to be detected is obtained. The error correction method can correct errors caused by difference of microstructures of a mother material zone and a zone to be detected and substantially improve residual stress ultrasonic measurement precision.
Owner:SOUTHWEST JIAOTONG UNIV
Welding residual stress measurement method based on ABAQUS
InactiveCN108491652ADesign optimisation/simulationSpecial data processing applicationsWelding residual stressEngineering
The present invention discloses a welding residual stress measurement method based on the ABAQUS. The method comprises: according to the geometry of the test piece, establishing a 3D geometric model of the welded test piece; performing global mesh generation on the model; loading material data and thermal boundary conditions to simulate the welding process; and finally solving the temperature field and the stress field. The numerical simulation results of the method disclosed by the present invention have high accuracy and can be used as an effective tool for welding process design and parameter optimization.
Owner:CHINA JILIANG UNIV
Accumulated fatigue damage self-diagnosis system for railway steel truss bridge node
InactiveCN101769913ATimely repairEnsure safetyMaterial analysisFatigue damageWelding residual stress
The invention discloses an accumulated fatigue damage self-diagnosis system for a railway steel truss bridge node. When a train boards a bridge, a stress response time-history signal of a middle cross section of a truss rod piece which is connected with the tested node when the train goes by is automatically acquired through a strain sensor; a bending moment and shaft force time-history conversion module converts the stress response time-history signal into a bending moment and shaft force time-history signal; a dynamic stress analysis module takes a node welding residual stress field which is determined according to a construction process of a node welding line as an initial stress field, and superposes a node train traveling dynamic stress field which is determined by the bending momentand shaft force time-history signal to obtain the position of a most dangerous point and the strain state of the bridge node welding line; and finally, a fatigue accumulation analysis module determines the fatigue damage accumulation degree of the most dangerous point when the train goes by according to the position of the most dangerous point and the strain state and the strain fatigue critical surface method, and then a man-machine interaction interface informs a user of the fatigue damage accumulation degree. Therefore, the system can automatically inform the user of fatigue information ofthe welding line of the railway steel truss bridge node in time so as to repair the railway steel truss bridge in time and guarantee the safety of the railway steel truss bridge.
Owner:WUHAN UNIV OF TECH
Method used for testing residual stress in welding heat affected zone
ActiveCN107643141AAvoid destructionAvoid the problem of inaccurate calculation of contact areaApparatus for force/torque/work measurementHeat-affected zoneWelding residual stress
The invention relates to the field of material mechanical property characterization, and in particular relates to a method used for testing residual stress in a welding heat affected zone. The methodcomprises the steps that different press-in displacements h are loaded in a welding sample base zone to acquire corresponding press-in force F, and corresponding contact stiffness S is acquired at theinitial phase of unloading; according to the curve of the press-in force F and the press-in displacements h, curvature K1 is acquired; curvature K2 is acquired according to the curve of the contact stiffness S and the press-in displacements h; the set press-in displacement hx is loaded in the welding sample base zone to acquire the average press-in force F0 of the welding sample base zone; the set press-in displacement hx is loaded in the welding sample welding heat affected zone to acquire the press-in force FHAZ of the welding sample heat affected zone; and the welding residual stress of the welding sample heat affected zone is acquired. According to the method, a welding seam is prevented from being damaged; the test application range is expanded; the problem of inaccurate contact area calculation caused by the wear of an indenter is avoided; the problem of inaccurate contact area caused by the stacking effect is avoided; and the testing accuracy is ensured.
Owner:BEIJING JIAOTONG UNIV
Method for lowering weld seam cracking risk in heat treatment process after welding of large inserting plate of extra-high pressure container
ActiveCN109722525AReduce distortionImprove coordinationFurnace typesHeat treatment furnacesStress concentrationWelding residual stress
The invention discloses a method for lowering a weld seam cracking risk in the heat treatment process after welding of a large inserting plate of an extra-high pressure container, and relates to the technical field of pressure container welding. The method includes the following steps of increasing the width of a weld seam cover; grinding the weld seam cover; determining a heating region, and arranging heating sheets and heat preservation cotton; and carrying out post-welding heat treatment by adopting a six-section three-times symmetric heating mode. The method has the beneficial effects thatby increasing the width of the weld seam cover and combining a mechanical grinding method, the weld seam cover and a base material are made to in smooth transition, stress concentration and tensile welding residual stress at weld seams and weld toes of the large inserting plate of the extra-high pressure container are remarkably lowered, the six-section three-times symmetric heating mode is adopted for post-welding heat treatment, large discordant deformation in the post-welding heat treatment process is avoided, deformation coordination on two sides of the weld seams is improved, and the weld seam cracking risk is effectively lowered.
Owner:SHANDONG NUCLEAR POWER EQUIP MFG +1
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