最新刊期
期 5 ， 2021
- 摘要：Bogie frame is an important part of high-speed train.The welding quality of bogie frame is the key factor to determine the quality of bogie.It is urgent to strengthen the control of welding production process through information system.The intelligent welding group control system,a platform for bogie frame welding process management and control,is established based on the Internet of things,big data and cloud computing technology.The system is applied to monitor the status of welding machine in real time,realize online control of welding process parameters,digital management of welding process and statistical analysis of data,have improved the ability of welding production management,and provided important data support for managers to optimize the production process,allocate resources and assess welders.关键词：welding management and control;group control system;frame welding;bogie frame
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发布时间：2022-03-14 - 摘要：The solder joint is difficult to position accurately during the resistance spot welding process of enameled wire,resulting in welding quality problems such as virtual welding,weld misalignment and lack of weld. In order to solve these problems, assembly recognition and positioning system for resistance spot welding of enameled wire based on machine vision is developed. The various kinds of bad patterns during the resisance spot welding positioning process of enameled wire are analyzed,the image processing algorithms of recognition and positioning system are studied,and the strategy and rules of positioning are formulated. Firstly,the region images of enameled wire and pad are acquired by extracting ROI with template matching;secondly,the bad patterns are recognized and eliminated by means of image processing algorithms such as thresholding,morphology and Laplacian operator;lastly,the optimum solder joint position are computed through extracting the edge of enameled wire and pad. The experiment results show that the positioning system can effectively eliminate the bad patterns, accurately extract and output the coordinates of the optimum solder joint position. This system can meet the requirements of automatic resistance spot welding of enameled wire because its recognition and extraction time is very short.
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发布时间：2022-03-14 - 摘要：Taking welding projects of various axle housing products as examples, the typical design ideas and application examples of the three-axis inverted positioner used in the robot welding workstation are summarized,including the main structure design,technical parameters,working principle of the three-axis inverted positioner. The working principle and function realization of the three-axis inverted positioner,which is the core equipment of the whole welding workstation,are mainly analyzed. It has been proved by practice that the welding effect is good,the automation degree is high, the manual operation is flexible and convenient,which ensures the welding quality of axle housing and meets the welding requirements. It provides an important reference for the follow-up project.关键词：robot welding workstation;three-axis overturning positioner;design idea;structural analysis;technical parameters
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发布时间：2022-03-14 - 摘要：A welding test is conducted on nuclear grade hollow blade by robot automatic welding method,comparing with manual welding,the microstructure and microhardness distribution of the welded joint are analyzed,and the automatic welding parameters are optimized. The intelligent welding system of automatic welding is established,and the fixture of profiling structure is designed. The automatic welding production line is built with the linkage of multi-positioner,the trial production of hollow blade test piece is completed. Through the test, it is verified that the production efficiency of the system is twice higher than that of traditional manual welding. The welding position and segmented welding scheme of hollow blade are studied by welding numerical simulation analysis,and are compared with the actual blade welding. The results show that the deformation trend of automatic welding is basically consistent with the actual welding process,the weld is well formed.Through the research of hollow blade automatic welding system,the economy and reliability of nuclear power five stage hollow blade welding can be improved,and the product quality requirements can be better met. Thus the research has great practical significance in engineering application.
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发布时间：2022-03-14 - 摘要：Electrospark deposition（ESD）can be used for preparing strengthened coatings with high hardness,excellent wear resistance and excellent corrosion resistance,which can significantly improve the performance and service life of mechanical parts. However,traditional ESD mainly relies on manual operation. In this paper,a set of ESD automatic deposition monitoring system is designed based on Labview as a development platform,and the hardware of the system is mainly composed of a PC,an Arduino control card,a stepper motor and the like. The system has the functions of motion control,motion feedback, data collection,deposition track setting,display and the like. The Bresenham algorithm is added to a deposition path,and therefore the automatic control over an ESD process is realized.关键词：LabVIEW;Arduino;ESD;Bresenham interpolation algorithm
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发布时间：2022-03-14 - 摘要：In this paper,the research and development background,purpose and significance,content structure and main characteristics of the 1 +X "special welding technology" teaching material are introduced,around on the basis of professional knowledge,project application oriented,with professional skills as the core of the writing principle,fully embody vocational skills escalate characteristics of cognitive regularity and skill level. It is pointed out that the widespread application of welding robots has profoundly changed the development layout of the welding industry. With the rapid development of the automobile production industry,the demand for spot welding robot equipment and skilled personnel has continued to increase. Therefore,the research and development of "spot welding robot" module plays an important guiding role in accelerating the cultivation of spot welding robot technical talents in vocational colleges.关键词：1+X;special welding technology;spot welding robot
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发布时间：2022-03-14 -
Numerical simulation and analysis on overlay weld repair of structure of nuclear-grade weldolet weld
摘要：In order to optimize the technology of overlay weld repair of structure of nuclear-grade weldolet weld. Based on the Abaqus software,the 3 D finite element model is established,combined with double ellipsoid source model and birthdeath element,the simulation calculation analysis of the overlay weld repair is carried out,the distribution of temperature field and welding deformation and also residual stress on the process of overlay weld repair is analyzed. Based on the calculation results,the analysis of the influencing factors of surfacing welding is carried out. The results show that compressive stress is formed on the inner side of the original weld structure;from the inner side of the weld structure to the surface of the surfacing layer,the compressive stress gradually transforms into tensile stress;and the residual stress decreases continuously as the increase of the welding speed,also the welding deformation and residual stress can be effectively reduced by using the alternating anticlockwise-clockwise welding sequence. The results of this research can provide reference for the optimization of overlay weld process.关键词：overlay weld repair;numerical simulation;weldolet weld;residual stress- 32
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发布时间：2022-03-14 - 摘要：In order to achieve high efficiency and high quality plasma cladding of directionally solidified DZ125 alloy,under the condition of water cooling,Eu Tro Loy16006 Co-based alloy powder cladding layer is prepared on the surface of DZ125 alloy by plasma arc spray welding to study the effect of different cooling conditions on the microstructure growth and hardness of cladding layer. The results show that the fine columnar crystal microstructure forms at the bonding interface of the base material,and the microstructure changes from columnar crystal to equiaxed crystal when the cladding layer thickness increases.The growth height of columnar crystal under water cooling condition is higher than that under air cooling condition. The hardness of the columnar crystal is similar to that of the base material,and the hardness of the equiaxed crystal is lower than that of the columnar crystal. The hardness of the equiaxed crystal close to the surface of the cladding layer is the minimum. The cladding layer with the same hardness as the base material obtained under the water cooling condition is wider than that under the air cooling condition.关键词：plasma arc spray welding;Co-based alloy cladding layer;DZ125 alloy;microstructure;microhardness
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发布时间：2022-03-14 - 摘要：In this paper,the TIG welding technology is used to perform a plate welding test on 304 stainless steel,and the test results are analyzed from the microstructure and mechanical properties,the optimum welding parameters are selected as welding current of 310 A and welding speed of 13 mm/s.The composition of austenite and ferrite in weld microstructure of welded joint is obtained by metallographic characterization,X-ray fluorescence diffraction and electron backscatter diffraction. According to the optimum welding parameters,the large-scale finite element simulation software ABAQUS is selected,and the TIG welding process is simulated by double ellipsoid heat source model. The weld cross-section morphology obtained by simulation and test are compared,and according to comparison results,the simulation model is optimized to provide reference for the optimization of welding parameters.关键词：304 stainless steel;tungsten inert gas welding;temperature field;numerical simulation
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发布时间：2022-03-14 - 摘要：The 3 D finite element model of keyhole plasma arc welding of 316 stainless steel was established by GAMBIT software and meshed,and then the iterative calculation was carried out by FLUENT software. By programming UDF program,the loading of moving heat source and force source and the definition of phase were realized. The VOF equation was used to trace the phase interface. The temperature field nephogram of longitudinal cross-section and transverse cross-section at different time and the flow of liquid metal in molten pool were solved.The results show that:with the change of welding time,the workpiece is gradually penetrated under the action of arc heat,and the liquid metal in the molten pool changes dynamically under the action of plasma arc pressure, plasma flow force and its reaction force. The welding experiment of 6 mm 316 stainless steel was carried out,and the numerical simulation results of the weld cross-section were compared with the experimental results,which basically agreed with each other,which verified the reliability of the numerical simulation results.关键词：316 stainless steel;temperature field;liquid metal;numerical simulation
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发布时间：2022-03-14 - 摘要：Based on the ANSYS "element birth and death technology",a three-dimensional finite element analysis model of multilayer laser cladding is established. The distribution law of temperature field of multilayer laser cladding is obtained,and the influence of preheating temperature on thermal cycle of laser cladding is analyzed. The experimental results show that the heating speed of the nodes parallel to the moving direction of the heat source is faster and the cooling speed is slower. For the nodes perpendicular to the moving direction of the heat source,the closer to the center of the cladding layer,the faster the heating speed and cooling speed.The temperature gradient of node in Y direction is greater than that in X direction. When the heat input remains constant,as the preheating temperature increases,the heating speed changes little,the peak temperature increases,and the residence time above the phase transition temperature stays longer,but the residence time at high temperature has little change. When the preheating temperature is 200 ℃,the t8/5 parameter is about 3.2 times of that without preheating,and the cracking tendency of the cladding can be reduced by preheating. The simulation results show that preheating can effectively reduce the coating stress.关键词：laser cladding;temperature field;ANSYS;element birth and death;preheating
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发布时间：2022-03-14 - 摘要：The relationship between parameters and tensile strength of CMT+P welded 2 A97 Al-Li alloy is established by quadratic rotary unitized design,and the influences of welding parameters on the mechanical properties of welded joint are investigated by metallographic microscope,scanning electron microscopy and tensile testing machine. Experimental results show that the range of optimized welding parameters can be determined according to the regression equation,in this range,the weld is well formed,and the tensile strength exceeds60% of the base metal. The tensile fracture occurs in the bond line zone with ductile-brittle mixed mode,and the transition zone between equiaxed fine grain and columnar crystal becomes the weakest link of the joint.关键词：Al-Li alloy;quadratic rotary unitized design;CMT+P welding;mechanical properties
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发布时间：2022-03-14 - 摘要：According to relevant standards,there are four main testing methods for diffusive hydrogen:glycerol method,mercury method, gas chromatography method and thermal displacement method. Among them,glycerol method has the characteristics of the most common application,the longest use time,the lowest test cost and the best safety,so it has been applied in the standard for a long time. However,the accuracy of glycerol method is low,especially in the case of ultra-low hydrogen,it is difficult to meet the requirements. The latest national standards are no longer recommended. Based on the discharging method of Tianjin University,a new diffusive hydrogen testing technology by glycerol method was realized through structural optimization and improvement. The results show that the precision of alkaline electrode E5015（Tianjin Bridge） used in electrode arc welding is 24%～28% higher than that of KQ-3 equipment,28% higher than that of CO2 gas shielded welding and 28.7% higher than that of argon arc welding.关键词：new test method;diffused hydrogen;glycerol method
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发布时间：2022-03-14 - 摘要：The welded joint specimens are obtained through surfacing the Cr-Ni stainless steel on Q235 by ESW（electro-slag welding） with band-electrode. Metallographic observation shows that there is various microstructure morphology in the fusion zone,where an "island" and a "peninsula" images are observed. The composition characteristics of fusion zone across the "peninsula" are analyzed by EDS. The formation mechanism of "island" and "peninsula" is analyzed from the metal transfer and molten pool characteristics of electro-slag surfacing. Metallographic analysis of the surfacing layer shows that the welding heat input and cooling rate are the main factors affecting the surfacing microstructure morphology. With the decrease of welding heat input and the increase of cooling rate,the content of δ ferrite in the deposited metal increases gradually, and its morphology changes from vermicular and intermittent to slender skeletal, finally appears dense and thick skeletal and lathy.关键词：mircostructure;composition;δ-γ phase transition;electro-slag surfacing with band-electrode
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发布时间：2022-03-14 - 摘要：A series experiments are conducted to study the selective laser melting（SLM） process of refractory metal tantalum. The single pass,single layer and bulk experiments with different laser powers,scanning speeds and scanning spaces are explored. The experimental results show that the optimum SLM parameters for tantalum are laser power of 300 W and scanning speed of 50 mm/s. According to the different degrees of cracking on the tantalum layers,the heat conduction and the accumulation of internal stress in SLM process are analyzed qualitatively. Finally the cubic tantalum is successfully fabricated and its microstructure and component distribution is characterized by SEM and EDX.关键词：selective laser melting;tantalum;deformation and cracking;interlayer separation;heat conduction
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发布时间：2022-03-14 - 摘要：Cast steels AAR M 201 with different preheating temperatures and groove forms are welded with low alloy and high strength steel ASTM A588. The tensile, bending and impact tests are performed on welded joints to determine the welding process of cast steel structure. The results show that for butt joint of 8 mm and below,the preheating and interpass temperature must not be lower than 150 ℃ ;for butt joint of 8 ～20 mm,the preheating temperature must not be less than 300 ℃.Both 8 HV and 10 DHV,the welded joints have good tensile strength, plasticity and toughness,and welded joints with 180°bending are qualified. Both weld and heat affected zone,welded joints have good low temperature impact toughness.关键词：AAR M 201;welding process;mechanical properties
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发布时间：2022-03-14 - 摘要：The precipitation behavior of σ phase and its effect on mechanical properties of ER347 deposited metal during long-term aging at 750 ℃ are studied. The results show that the ferrite content,hardness and impact toughness of ER347 deposited metal are closely related to the aging time. When ER347 deposited metal is aged at 750 ℃,with the extension of aging time, σ phase precipitation increases,hardness increases,while the ferrite content and toughness decrease. ER347 deposited metal has good as-welded impact toughness,but the toughness decreases after aging treatment. The root cause of the embrittlement is that δ-ferrite decomposes to form a hard and brittle σ phase,which significantly reduces the toughness of ER347 deposited metal. There are a large number of high-energy σ/γ2 and δ/σ/γ2 incoherent interface inside（σ +γ2） structure,and the σphase itself is hard and brittle, which is easy to act as a potential crack source,under high strain rate,brittle cracking occurs and spreads rapidly, resulting in the deposited metal toughness decreased.关键词：ER347 deposited metal;σ phase;mechanical properties;aging treatment
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发布时间：2022-03-14 - 摘要：The effective connection of Si C ceramics can be achieved through the brazing with Ag-Cu-Ti filler. A large residual stress is caused in the cooling process of brazing due to a big difference of thermal expansion coefficient between the filler and Si C ceramic. In this article,the thermal expansion coefficient of Ag-26.7 Cu-4.5 Ti filler is adjusted by adding W particles with different volume fraction to make it closer to Si C ceramics. The influence of brazing parameters on microstructure and mechanical properties of weld is studied by changing brazing temperature and holding time. The results show that W particles are uniformly distributed in the matrix and do not react with other elements. When adding a suitable volume fraction of W particles,a composite joint with uniform microstructure and good connection is formed under an appropriate brazing temperature and holding time. When the adding volume fraction of W is 10%,the maximum shear strength of 95.05 MPa is obtained at 807 ℃ for 10 min.关键词：SiC ceramics;brazing;Ag-Cu-Ti +W composite filler;shear strength
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发布时间：2022-03-14 - 摘要：In this paper,domestic submerged arc welding technology with large diameter welding wire for steel structures is mainly introduced. According to the output parameters（current,voltage） of the existing equipment in the factory, replacing the existing φ4.8 mm welding wire with a large diameter welding wire for submerged arc welding to improve the deposition efficiency per unit time of submerged arc welding and achieve the purpose of improving the efficiency of submerged arc welding. This article provides a reliable technical basis for efficient welding with large diameter welding wire,and provides a reference for the construction of related projects in the future.
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发布时间：2022-03-14 - 摘要：High chromium cast iron core welding wire was selected to carry out surfacing experiments with different layer temperatures on the ZTA reinforced high chromium cast iron base composite test block. The microstructure and interface of deposited metal and composites were observed by bulk microscope,optical microscope and scanning electron microscope,and the volume percentage of deposited metal carbide was counted by quantitative gold phase method. The results show that,the deposited metals are typical high chromium cast iron with different layer temperature. The microstructure consists of primary carbide,eutectic ledeburite,martensite and retained austenite. With the decrease of interlayer temperature,the volume percentage of carbide increases gradually,and the volume percentage of deposited metal carbide can reach 55.17% when the layer temperature is 30 ℃. The lower the interlayer temperature is,the more fully the stress is released through the stress release crack. When the layer temperature is 30 ℃,the ZTA particles are not cracked and the interface is stripped,which is suitable for surfacing welding of composite materials.
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发布时间：2022-03-14 - 摘要：<正>2020年12月,经过多项学术指标综合评定及同行专家评议推荐,《电焊机》杂志被中国科学技术信息研究所收录为"中国科技核心期刊"（中国科技论文统计源期刊）。《电焊机》杂志多年来一直被收录为"中国科技核心期刊",在此感谢行业专家、学者、广大读者、作者长期以来的关注与支持,《电焊机》杂志将继续努力,进一步提高出版质量和办刊水平,不断增强影响力、传播力和竞争力,争创优秀精品期刊。
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发布时间：2022-03-14 - 摘要：<正>近日,由中国学术期刊（光盘版）电子杂志社有限公司、中国科学文献计量评价研究中心编制出版的《中国学术期刊影响因子年报（2020版）》正式发布,《电焊机》杂志再次入选《中国学术期刊影响因子年报》统计源期刊,在此感谢行业专家、学者、广大读者、作者长期以来的关注与支持,《电焊机》杂志将继续努力,进一步提高出版质量和办刊水平,不断增强影响力、传播力和竞争力,争创优秀精品期刊。
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发布时间：2022-03-14 - 摘要：<正>著名的国际焊接界资深专家、德国莱布尼茨大学（原汉诺威大学）教授Dr. D. Rehfeldt于2021年5月5日（德国当地时间）因病去世,享年83岁。Dr. D. Rehfeldt教授是中国焊接界的老朋友,曾在20世纪70年代末作为德国科技代表团成员来我国访问,至2017年先后20余次访华,开展学术与技术交流、参加我国举办的焊接国际论坛等活动。我国焊接界多位专家、学者曾在他的实验室进修、合作与交流。他曾任《焊接学报》、《电焊机》杂志的编委,曾被聘为我国多个大学院所的客座或名誉教授。他原创发明的"汉诺威分析仪"是焊接过程信息化工业应用的先驱,已在全球包括中国用户在内的100多个企业与研究院校单位得到应用。
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发布时间：2022-03-14 - 摘要：<正>专题以"增材制造"为主题,重点关注各种增材制造技术的最新研究进展和应用、以及增材制造装备和配套材料的研发等,期望提升制件过程的可靠性,推动增材制造在各制造领域的不同维度的研究发展。征文时间:2021年1月1日～2021年6月30日重点关注内容:增材制造技术（激光、电子束、等离子束、电弧及其复合）的国内外现状和发展趋势;主要包括:增材制造工艺和过程优化、材料及结构的各种后处理工艺、增材制造质量控制与评估技术、增材制造结构完整性理论与实验技术、增材制造修复再制造技术、增材材料工艺-组织-性能-服役关联建模、增材制造结构一体化设计技术、增材制造装备发展、增材制造在国家重大项目中的应用等。
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发布时间：2022-03-14
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