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Temperature field calculation of rail flash welding
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作者 Rui Xu Min Zhang +6 位作者 Zhenkun Gao Guo Zhao Wei Ding Shouming Wang Peng Zhang Xiang Liu Jingjing Li 《High-Speed Railway》 2024年第2期116-121,共6页
The forging stage of rail flash welding has a decisive influence on joint strength,and the study of the temperature distribution in the process has an important role in further improving joint strength.In this paper,t... The forging stage of rail flash welding has a decisive influence on joint strength,and the study of the temperature distribution in the process has an important role in further improving joint strength.In this paper,three calculation methods for the temperature field are given.First,the finite element model of the temperature field before forging rail flash welding is established by using the transient heat module of Ansys software and verified by infrared temperature measurement.Second,the temperature distribution of different parts of the rail before flash welding is obtained by using infrared thermal imaging equipment.Third,Matlab software is used to calculate the temperature of the non-measured part.Finally,the temperature distribution function along the rail axis is fitted through the temperature measurement data.The temperature distribution before the top forging of the rail flash welding can be used to analyze the joint and heat-affected zone organization and properties effectively and to guide the parameter setting and industrial production. 展开更多
关键词 Flash welding temperature field Joint strength Software calculation
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THE COUPLED FEM ANALYSIS OF THE TRANSIENT TEMPERATURE FIELD DURING INERTIA FRICTION WELDING OF GH4169 ALLOY 被引量:8
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作者 L.W. Zhang J.B. Pei +4 位作者 Q.Z. Zhang C.D. Liu W.H. Zhu S. Qu J.H. Wang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2007年第4期301-306,共6页
The inertia friction welding process is a non-linear process because of the interaction between the temperature field and the material properties as well as the friction force. A thermo-mechanical coupled finite eleme... The inertia friction welding process is a non-linear process because of the interaction between the temperature field and the material properties as well as the friction force. A thermo-mechanical coupled finite element model is established to simulate the temperature field of this process. The transient temperature distribution during the inertia friction welding process of two similar workpieces of GH4169 alloy is calculated. The region of the circular cross-section of the workpiece is divided into a number of four-nodded isoparametric elements. In this model, the temperature dependent thermal properties, time dependent heat inputs, contact condition of welding interface, and deformation of the flash were considered. At the same time, the convection and radiation heat losses at the surface of the workpieces were also considered. A temperature data acquisition system was developed. The temperature at some position near the welding interface was measured using this system. The calculated temperature agrees well with the experimental data. The deformation of the flash and the factor affecting the temperature distribution at the welding interface are also discussed. 展开更多
关键词 inertia friction welding temperature field numerical simulation finite element method
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Numerical simulation of temperature fields for T-joint during TIG welding of titanium alloy 被引量:7
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作者 王敏 董志波 +1 位作者 于澜 魏艳红 《China Welding》 EI CAS 2008年第3期6-9,共4页
Three-dimensional finite element model was established to simulate temperature fields of T-joint titanium sheets during TIG welding with finite element method (FEM) software. Temperature dependent material propertie... Three-dimensional finite element model was established to simulate temperature fields of T-joint titanium sheets during TIG welding with finite element method (FEM) software. Temperature dependent material properties and the effect of latent heat were considered. A technique of element birth and death was used to simulate the process of welded metal filling. Dynamic variation process of temperature fields during T1G welding was achieved. The simulated results agreed well with the measured results. 展开更多
关键词 TIG welding TITANIUM T-JOINT temperature field finite element method
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Numerical simulation on temperature field for resistance spot welding of non-equal thickness stainless steel 被引量:8
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作者 王春生 陈勇 +2 位作者 韩凤武 陆培德 姜中辉 《China Welding》 EI CAS 2003年第1期6-10,共5页
An axisymmetric finite element model is developed to simulate the temperature field of resistant spot welding according to the process characters of nugget formation of non equal stainless steel sheets. A simulation ... An axisymmetric finite element model is developed to simulate the temperature field of resistant spot welding according to the process characters of nugget formation of non equal stainless steel sheets. A simulation method of the interaction of electrical and thermal factors is presented. The spot welding process of nugget formation is simulated using hard and soft welding technique norms. The heating characters of soft and hard norms determine the differences in the process of nugget formation and determine the finally shape and offset of nugget. Experimental verification shows that the model prediction agrees well with the practical. 展开更多
关键词 resistance spot welding finite element temperature field numerical simulation
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Three dimensional numerical simulation of welding temperature fields in stainless steel 被引量:9
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作者 董志波 魏艳红 +1 位作者 刘仁培 董祖珏 《China Welding》 EI CAS 2004年第1期11-15,共5页
Three kinds of mathematical models representing welding heat sources are presented. Among them, Gaussian model and double ellipsoidal model are used to analyze the thermal distributions with finite element method. At ... Three kinds of mathematical models representing welding heat sources are presented. Among them, Gaussian model and double ellipsoidal model are used to analyze the thermal distributions with finite element method. At the same time, this paper analyzed the influences of the heat source models, the latent heat and the welding parameters on the temperature distributions. The comparisons between the simulated results and the experiments show double ellipsoidal model is good for three-dimensional numerical simulations. Furthermore, the adaptive mesh technique is applied in the three-dimensional model which greatly reduces the number of nodes and elements in the simulation. 展开更多
关键词 double ellipsoidal model adaptive mesh technique welding temperature field stainless steel
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Influence of welding parameters on temperature field characteristics during laser welding of TA15 by infrared thermography 被引量:4
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作者 Duan Aiqin Gong Shuili Huang Song 《China Welding》 EI CAS 2018年第2期1-12,共12页
Using an infrared thermographic technique, the temperature field during laser welding of TA15 is quantitatively measured and investigated. The ilffluenee of two welding parameters on the weld temperature distribution ... Using an infrared thermographic technique, the temperature field during laser welding of TA15 is quantitatively measured and investigated. The ilffluenee of two welding parameters on the weld temperature distribution is analyzed and the meehanisnl is discussed. New conclusions are drawn that are different from conventional weld temperature distributions. For the face of the weld, changes in welding speed induce changes in the temperature distribution because of different heat inputs and the cooling effect. Sinfilar temperature features in the welds are observed for all speeds, which exhibit a relatively low temperature area below 1 500 ℃ between the high temperature area in the position of laser incidence and the sub-high temperature area at the end of the molten pool. For the ilffluenee of laser power on the face of the weld, the temperature on the weld is higher for P = 2.8 kW compared to P = 2.0 kW, especially the temperature in the sub-high temperature area. However, for the temperature field of the back of the weld, the ilffluenee of welding speeds is quite different compared to the results for the face of the weld. The highest temperature does not locate in the keyhole area, but instead in the middle of the molten pool. And there are different temperature features at different speeds. When v = 6 m/min, the temperature field is like a uniform color belt and the temperature along the center of the weld fluctuates between 300 and 450 ℃. When v = 4 m/rain, the transient temperature distribution is not uniform and is unstable at different times. However, for v = 2.4 m/rain and lower speeds, the temperature field becomes stable. The ilffluenee of laser power on the back of the weld temperature field is more complex. The measured temperature does not increase with increasing laser power, which seems to eolffliet with the conventional thermal conduction theory-. This may be related with the characteristics of the keyhole area. 展开更多
关键词 YAG laser welding temperature field infrared thennography Ti alloy
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Calculation of temperature field near stagnation point in explosive welding 被引量:2
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作者 王金相 李晓杰 +1 位作者 王占磊 陈涛 《China Welding》 EI CAS 2006年第3期41-45,共5页
Energy deposition at the interface of explosive welding is analyzed by symmetrical impaction model of uneompressible liquid. Equation of energy in the flow field of explosive welding is deduced and the distribution of... Energy deposition at the interface of explosive welding is analyzed by symmetrical impaction model of uneompressible liquid. Equation of energy in the flow field of explosive welding is deduced and the distribution of temperature in the flow field is solved by finite difference method on the basis that the adiabatic compression is considered. The results show that the temperature rise increases with the increasing of the velocity of approaching flow and impact angle, under appropriate velocity of approaching flow and impact angle the temperature rise near the welding interface will be higher than the melting point of the material and the thin melted layer is localized on the region near welding interface. 展开更多
关键词 explosive welding adiabatic compression temperature field finite difference method
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Modelling of the plasma-MIG welding temperature field 被引量:2
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作者 白岩 高洪明 +1 位作者 吴林 石磊 《China Welding》 EI CAS 2006年第4期5-8,共4页
A three-dimensional simulation model for the plasma-MIG welding process, which takes the interaction between the plasma arc and MIG arc into account, is presented and the quasi-steady temperature fields on the workpie... A three-dimensional simulation model for the plasma-MIG welding process, which takes the interaction between the plasma arc and MIG arc into account, is presented and the quasi-steady temperature fields on the workpiece are calculated with the model. The 10 mm-5A06 aluminum alloy is welded and the temperature fields are measured with the thermoelectric couple. The simulation results and measured results show that the biggest deviation of peak temperature between them is below 20 ℃, which indicates good coincidence between the simulation and measurement. 展开更多
关键词 heat source model plasma-MIG welding temperature field thermoelectric couple
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NUMERICAL SIMULATION OF TEMPERATURE FIELD ON FLASH BUTT WELDING FOR HIGH MANGANESE STEELS 被引量:2
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作者 B.D. Yu W.D. Song F. C. Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第4期547-551,共5页
An axial symmetry finite element model coupled with electricity-thermal effect was developed to study the temperature field distribution in process of the flash butt welding (FBW) of frog highmanganese steel. The in... An axial symmetry finite element model coupled with electricity-thermal effect was developed to study the temperature field distribution in process of the flash butt welding (FBW) of frog highmanganese steel. The influence of temperature dependent material properties and the contact resistance were taken into account in FEM 'simulation. Meanwhile, the lost materials due to .splutter was resolved by using birth and death element. The result of analyzing data shows that the moddel in the FBW flashing is reasonable and feasible, and can exactly simulate the temperature field distribution. The modeling provides reference for analysis of welding technologies on the temperature field of high-manganese steel in FBW. 展开更多
关键词 flash butt welding (FBW) numerical simulation high manganese steel temperature field
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Real-time measurement of welding temperature field and closed loop control of penetration 被引量:2
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作者 张华 潘际銮 《China Welding》 EI CAS 1999年第2期49-56,共8页
Colormetric method of images by using two different wavelength images is a new measuring method for welding temperature field on the basis of ordinary colorimetric method, which depends little on the measuring distanc... Colormetric method of images by using two different wavelength images is a new measuring method for welding temperature field on the basis of ordinary colorimetric method, which depends little on the measuring distance, emissivity of body etc. In this paper the real time measuring system and measuring principle of welding temperature field are described, the whole welding temperature field is real time measured, so the temperature distribution at the welding direction and its cross section is obtained, then parameters of thermal cycle. With data from the temperature closed loop control system of the parameters of temperature field is developed and tested. Experimental results prove that it has high measurement speed (time of a field within 0.5 s ) and good dynamic response quality. Weld penetration can be controlled satisfactorily under the variation of welding condition such as welding thickness, welding speed and weldment gap etc. 展开更多
关键词 welding temperature field colorimetric method of images welding thermal cycle penetration control
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Finite element simulation of three-dimensional temperature field in underwater welding 被引量:1
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作者 刘习文 王国荣 +1 位作者 石永华 钟继光 《China Welding》 EI CAS 2007年第2期59-65,共7页
Mathematical models of three-dimensional temperature fields in underwater welding with moving heat sources are built. Double ellipsoid Gauss model is proposed as heat sources models. Several factors which affect the t... Mathematical models of three-dimensional temperature fields in underwater welding with moving heat sources are built. Double ellipsoid Gauss model is proposed as heat sources models. Several factors which affect the temperature fields of underwater welding are analyzed. Water has little influence on thermal efftciency. Water convection coefftcient varies with the temperature difference between the water and the workpiece , and water convection makes molten pool freeze quickly. With the increase of water depth, the dimensions of heat sources model should be reduced as arc shrinks. Finite element technology is used to solve mathematical models. ANSYS software is used as finite element tool, and ANSYS Parametric Design Language is used to develop subprograms for loading the moving heat sources and the various convection coefftcients. Experiment results show that computational results by using double ellipsoid Gauss heat sources model accord well with the experimental results. 展开更多
关键词 underwater welding temperature fields finite element method double ellipsoid Gauss heat sources model water convection
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Artificial-neural-network-based storage method for three-dimensional temperature field data during friction stir welding 被引量:1
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作者 Han Ce Zhang Qian +4 位作者 Shi Qingyu Tang Tianxiang Liu Xin Zhang Gong Chen Gaoqiang 《China Welding》 CAS 2022年第3期1-7,共7页
In this paper,a new storage method for the three-dimensional temperature field data based on artificial neural network(ANN)was proposed.A multilayer perceptron that takes the coordinate(x,y,z)as inputs and temperature... In this paper,a new storage method for the three-dimensional temperature field data based on artificial neural network(ANN)was proposed.A multilayer perceptron that takes the coordinate(x,y,z)as inputs and temperature T as output,is used to fit the three-dimension-al welding temperature field.Effect of number of ANN layers and number of neurons on the fitting errors is investigated.It is found that the errors decrease with the number of hidden layers and neural numbers per layers generally.When the number of hidden layers increases from 1 to 6,the maximum temperature error decreases from 74.74℃to less than 2℃.The three-dimensional temperature field data is obtained by finite element simulation,and the experimental verification is completed by comparing the simulation peak temperatures with the measured results.As an example,an ANN with 4 hidden layers and 12 neurons in each layer were applied to test the performance of the proposed method in storage of the three-dimensional temperature field data during friction stir welding.It is found that the average error between the temperature data stored in ANN and the original simulation data that stored point-by-point is 0.517℃,and the error on the maximum temper-ature is 0.193℃,while the occupied disk space is only 0.27%of that is required in the conventional point-by-point storage. 展开更多
关键词 friction stir welding temperature field artificial neural network numerical simulation
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Semi-analytic Solution of Steady Temperature Fields During Thin Plate Welding
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作者 DAI Yao TAN Wei +1 位作者 SUN Qi SUN Chang-qing 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2006年第B12期248-251,共4页
Usually, it is very difficult to find out an analytical solution to thermal conduction problems during high temperature welding. Therefore, as an important numerical approach, the method of lines (MOLs) is introduce... Usually, it is very difficult to find out an analytical solution to thermal conduction problems during high temperature welding. Therefore, as an important numerical approach, the method of lines (MOLs) is introduced to solve the temperature field characterized by high gradients. The basic idea of the method is to semi-discretize the governing equation of the problem into a system of ordinary differential equations (ODEs) defined on discrete lines by means of the finite difference method, by which the thermal boundary condition with high gradients are directly embodied in formulation. Thus the temperature field can be obtained by solving the ODEs. As a numerical example, the variation of an axisymmetrical temperature field along the plate thickness can be obtained. 展开更多
关键词 steady temperature field method of lines thin plate welding semi-analytic solution high gradient
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Effect of arc distance on temperature field and weld shape during double-sided arc welding
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作者 张广军 张华军 +1 位作者 高洪明 吴林 《China Welding》 EI CAS 2009年第1期23-28,共6页
A new high efficiency welding method, double-sided double arc welding with double powers (DSAW-D), is developed for thick plate of low alloy high strength steel in this study. It is well known that the thermal cycle... A new high efficiency welding method, double-sided double arc welding with double powers (DSAW-D), is developed for thick plate of low alloy high strength steel in this study. It is well known that the thermal cycles have an important influence on the microstructure, shape, stress, distortion and mechanical property. The DSA W-D method can control the temperature field on a wide range by regulating the distance between two arcs, improve the microstructure and prevent hot and cold cracking of high strength steel. But at present, the effect of arc distance on the temperature field and shape is not clear. Therefore, the paper researches the effect of arc distance on the temperature field and weld pool during DSAW-D using finite element method. The transient temperature field of different arc distance in DSAW-D is calculated. To verify the numerical results, the temperature is measured by the thermo-couple and the calculated results agree approximately with experimental data. Farther, the thermal property and mutual effect of double-sided arcs are investigated. The temperature distributions and weld pool profile at different arc distances are obtained. The results show that arc distance is a very important factor to affect the heat process. 展开更多
关键词 double-sided arc welding temperature field weld pool numerical simulation arc distance
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Welding temperature field analysis for featheredged cylinder based upon conformal transformation
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作者 张国栋 张富巨 《China Welding》 EI CAS 2006年第4期34-38,共5页
The accurate calculation and measurement of welding temperature field is an important precondition for welding metallurgical analysis and welding process controlling. In this paper, the conformal transformation is fir... The accurate calculation and measurement of welding temperature field is an important precondition for welding metallurgical analysis and welding process controlling. In this paper, the conformal transformation is firstly used to analyze the welding temperature field of featheredged cylinder. The center of the cylinder is chosen as the origin of column coordinate system, and every point may be expressed as complex field vector. The branch isogonality counterchanges the line parallel with the fusion line in half-infinite z-plane to the circle concentric with the fusion line in infinite cylinder. The Laplace equation and Poisson's equation still keep validity, so the temperature field equation can be solved. The conformal transformation and equation solution is processed by Matlab program language. It shows that the obtained analytical modeling of temperature field for featheredged cylinder based on conformal transformation is effective and accurate. 展开更多
关键词 welding temperature field conformal transformation CYLINDER thermal cycle
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Finite element analysis on temperature field and residual stress of welding assembly for I-beam and end-plate
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作者 贾栗 赵永生 +1 位作者 邹增大 邹勇料 《China Welding》 EI CAS 2013年第1期16-20,共5页
Based on full scale model of 1-beam and end-plate welding assembly with medium plate, welding temperature field and residual stress were simulated, infrared thermometers were employed to measure the real-time temperat... Based on full scale model of 1-beam and end-plate welding assembly with medium plate, welding temperature field and residual stress were simulated, infrared thermometers were employed to measure the real-time temperature Jbr verification purposes. Results show that the measured thermal cycle curves match well with the simulation result. Simulation results of welding residual stress indicate that the values of longitudinal and transverse stress on the upper surface of the plate are higher than the normal stress; higher tensile stresses exist at the end of the web weld toes and in the central area of the flange weld toes. The dangerous zones are located at the central areas of weld toes of the flange welds and near weld toes of the web welds. 展开更多
关键词 I-beam and end-plate welding assembly temperature field residual stress finite element analysis
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Numerical simulation of 80 ℃ temperature field distribution of thick plate multi-pass welding with SYSWELD 被引量:4
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作者 Han Tao Zhang Hongjie +3 位作者 Wu Qian Bao Liangliang Zhu Xiaoyu Ding Ling 《China Welding》 EI CAS 2018年第1期20-25,共6页
The PPG PITT-CHAR XP flame retardant system has been used by COOEC to preventing the thermal softening of steel in the high temperature,whose degradation temperature is 80 ℃.To prevent damage to PPG PITT-CHAR XP fire... The PPG PITT-CHAR XP flame retardant system has been used by COOEC to preventing the thermal softening of steel in the high temperature,whose degradation temperature is 80 ℃.To prevent damage to PPG PITT-CHAR XP fire retardant paint from excessive heat during welding,it is necessary to get accurately reserved area near the welding joints prior to welding. For the foregoing reasons,the 80 ℃ temperature field distribution of thick plate multi-pass welding was analyzed with SYSWELD.The influence of welding groove form and time interval on welding temperature field was also analyzed. Results showed that the range of 80 ℃ welding temperature field increased with the increasing of weld layers at first and then it inclined to stable value. Interpass time setting was crucial to control the range of 80 ℃ welding temperature field. It was also found that double V groove had better thermal diffusivity than double-bevel groove.And double-bevel groove was better than single V groove. 展开更多
关键词 THICK PLATE MULTI-PASS welding SYSWELD 80℃temperature field distribution
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Simulation on temperature field of TIG welding of copper without preheating 被引量:1
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作者 雷玉成 郁雯霞 +1 位作者 李彩辉 程晓农 《中国有色金属学会会刊:英文版》 EI CSCD 2006年第4期838-842,共5页
According to the conservation of energy principle and technology characteristics of tungsten inert gas(TIG), a model of non-steady three-dimensional temperature field for red copper’s TIG welding with a locomotive ar... According to the conservation of energy principle and technology characteristics of tungsten inert gas(TIG), a model of non-steady three-dimensional temperature field for red copper’s TIG welding with a locomotive arc was established. The temperature field of welding pool was calculated with finite element software ANSYS. Indrafted the heat enthalpy conception and the surface distribution dual-ellipsoid model, the demands of welding numerical simulation was primely satisfied. Aimed at bad weldability of red copper, the TIG welding of thick-wall red copper was studied adopting Ar+N2 without preheating. The results show that the heating effect of arc is evidently enhanced, it is viable to achieve the no preheating TIG welding of red copper. Comparing the experimental values with the calculated ones under different technological parameters, the results indicate that the model and practical course are well matched, which proves that the model is reliable and correct. 展开更多
关键词 TIG焊接 温度场 数值模拟 预热
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Analytical Model of Temperature Field in Unsteady Stage of Friction Plug Welding
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作者 YAN Chongjing ZHENG Yongle 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2019年第5期789-797,共9页
The temperature field in unsteady phase greatly affects the quality of friction plug welding(FPW).An analytical model is put forward to correlate the process parameters and the temperature field in unsteady phase of F... The temperature field in unsteady phase greatly affects the quality of friction plug welding(FPW).An analytical model is put forward to correlate the process parameters and the temperature field in unsteady phase of FPW.Applying the von Mises criterion for plastic deformation and linearizing the heat flux,the model is achieved by Laplace transformation.The predicated peak temperature and peak time agree with the experiment data,with errors of about 4%and 8%,of AA7075-T6 FPW. 展开更多
关键词 FRICTION PLUG welding(FPW) UNSTEADY STAGE temperature field ANALYTICAL model
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SIMULATION ON TEMPERATURE FIELD OF FRICTION STIR WELDED JOINTS OF 2024-T4 Al 被引量:6
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作者 S.X. Lu J. C. Yan W.G. Li S. Q. Yang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2005年第4期552-556,共5页
The thermal model of FSW based on the thermal elastic-plastic finite element method, and the transient temperature distribution of FS welded joints of 2024-T4 Al was simulated by using this model, which provides usefu... The thermal model of FSW based on the thermal elastic-plastic finite element method, and the transient temperature distribution of FS welded joints of 2024-T4 Al was simulated by using this model, which provides useful information for the investigation of FSW process. Simulation resuits show that the temperature distribution of the weld gradually decreases toward periphery in a radiate format, whose center is the probe, and the highest temperature in the weld can reach about 400℃. The initial terminal of the weld is a zone, in which the temperature gradient is great, and defects of the welding are easily produced in this zone. Temperature change at the end of the welded joint is as layer variation, the local serious defects are not easy to produce in this zone. 展开更多
关键词 friction stir welding aluminium alloy temperature field SIMULATION
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