最新刊期
期 11 ， 2018
- 摘要：Vertical welding is a significant welding technique in large-scale components manufacturing. With the enlargement of equipment and the increase of its reliability requirement,the development of high-efficiency and high-quality vertical welding technology is an inevitable trend. In this paper,the vertical welding is affected by gravity,which leads to poor weld formation and poor weld performance. A self-developed test platform for oscillating arc triaxial vertical welding robot system is developed. The thermal model of vertical welding process is simulated according to the pool modeling;through the comparison of welding current waveforms of the cross-section of the vertical plate under specific conditions,the effect of the molten pool on the vertical welding state in the forming process and the correction filtering method are analyzed,eliminating the influence of molten pool forming on welding wave-form and verify its feasibility,which provides a theoretical basis for studying the method of tracking welds in vertical welding.关键词：vertical welding;simulation modeling;filtering method
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发布时间：2023-03-29 - 摘要：Using SiC MOSFET and Si-based Schottky diode as main power devices,a 400 A class pulse MIG inverter welding power supply with ARM（advanced RISC machines） as the main control chip is developed. A SiC MOSFET driver with protection functions is designed according to the characteristics of SiC MOSFET power devices and the inverter welding power supply. The full bridge inverter structure is adopted in the main circuit,and the full bridge rectifier structure is adopted in the rectifier circuit. The results show that the output current waveform of the SiC MOSFET pulse MIG inverter welding power source is stable and controllable,the dynamic response performance is good,and the welding effect is excellent.关键词：SiC MOSFET;pulse MIG inverter;welding power supply
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发布时间：2023-03-29 - 摘要：Based on the spectral characteristics of GMAW arc,a monocular passive vision image acquisition system for molten pool was designed to capture the images of molten pool by adding a compound filter system and an external trigger system to the industrial camera. The average gray value of the image is used to judge the interference degree of arc light to the weld pool image,and the threshold value of wavelet transform modulus maximum edge detection algorithm is defined by the average gray value to extract the weld pool contour and its characteristic parameters. The molten pool contour features can reflect I-groove center and welding defects such as welding deviation（the deviation between groove center and wire projection center）,misalignment,excessive penetration and burn-through. The results show that the algorithm of molten contour extraction is reasonable,and the characteristic of molten pool defect is obvious,which provides technical support for the online monitoring of weld defects based on vision.关键词：gas metal arc welding;molten pool image;characteristic parameters;defect detection
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发布时间：2023-03-29 - 摘要：Aiming at the S355 J2 W+N butt joint with a thickness of 12 mm plate,the influence law of geometrical parameters such as residual height H of weld seam and weld fusion width W of weld seam on stress concentration at weld toe was investigated by using finite element calculation method,and the empirical equation of stress concentration coefficient at weld toe was obtained by regression analysis. The results show that:both weld width and weld residual height have effects on the stress concentration factor H,but the variation of residual height has great effects on the stress concentration at the weld toe. Under the same weld width,the stress concentration coefficient Ktof weld toe increases with the increase of residual height,and the maximum increase is 33.19%. When 1.0 mm<H<2.0 mm,the effect of the increase of weld residual height on Ktincreases gradually,but when 2.0 mm<H<3.0 mm,the effect of the increase of weld residual height on Ktdecreases. Increase the width of weld seam and reduce the residual height of weld seam,which can alleviate the change of section shape at the welding toe and effectively improve the stress concentration at the welding toe.关键词：butt joint;stress concentration factor;geometric parameters;regression analysis
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发布时间：2023-03-29 - 摘要：Aiming at the complex structural parts of aerospace aluminum alloy,he research on the integration and application of automatic welding system based on laser sensing robot was carried out. The real-time perception and adaptive ability of robotic automatic welding system for complex structures were improved by integrating intelligent laser sensing. The intelligent laser sensor is used to collect and analyze the geometric information of welding groove,and the automatic tracking of welding seam track in the automatic welding process of the robot is realized through the algorithm compensation calculation,and the complex path tracking of 0.2～10 mm gap and 0.1～3 mm staggered edge is realized,as well as the adaptive tracking adjustment of 1 ～4 mm gradual gap,the weld is uniformly penetrated and formed.关键词：GTAW;seam auto-tracking;laser intelligent sensor;Aluminum;cycle seam
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发布时间：2023-03-29 - 摘要：In order to study welding technology with higher heat input for super thick plates,the double-wire,three-wire and fourwire submerged arc welding experiments were carried out for steel plates of E36 W with thickness of 50 mm and 80 mm. The welded joints were tested by tensile and impact test. The experimental result shows that the mechanical properties of the joint after multi-wire submerged arc welding meet the requirements of marine engineering steels. The relative low impact toughness was exhibited in the weld metal. As the number of wires increases,the content of pre-eutectoid ferrite in the weld increases,and the grain size increases,which resulting in the decreasing of impact toughness. In the same welding process,the content of pre-eutectoid ferrite in 80 mm thick plate welds is more,and the grain size is larger,which resulting in the impact toughness decreasing.关键词：higher heat input welding;multi-wire submerged arc welding;mechanical property;acicular ferrite;grain size
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发布时间：2023-03-29 - 摘要：In this paper,based on the residual stress in the inner and outer sides of different structural diaphragms of B subway,with the help of numerical simulation technology,studying the residual stresses distribution of weld between inner and outer panels under two kinds of clapboard structure. By analyzing the simulation date,drawing a conclusion:the residual stress peak value of the two structures with holes and no holes is equal,and the pore structure is limited in reducing the residual stress. Therefore,the porous structure can be used instead of the pore structure to realize automatic welding and improve the working efficiency and economic benefit.关键词：B subway;SYSWELD;residual stresses of weld;numerical simulation
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发布时间：2023-03-29 - 摘要：Aiming at the laser welding of overlap joints of 3 mm+2.5 mm weathering steel material,the influence of welding parameters on weld penetration and weld width was studied by surfacing welding test,and the relationship between weld penetration and weld width with shear force was studied. The metallographic structure,hardness and tensile test results of the joint were analyzed. The results show that the optimum process parameters are obtained,and the shear force reaches a stable value when the weld penetration is greater than 1 mm when fixed weld width in the range of 0.7 ～0.9 mm. When the weld penetration is greater than 1 mm,the maximum shear force is 26 kN with a uniformly mechanical properties of the whole joint and a stability laser welding process. The hardness of weld and heat affected zone is higher than that of base metal,and there is a certain tendency of hardening.关键词：laser welding;overlap joint;weld penetration;weld width;shear force
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发布时间：2023-03-29 - 摘要：<正>（中国焊接协会）"以赛带培、以赛促练"——赛事宗旨2018年10月16-20日,2018’中国机器人焊接技能大赛在兰州职业技术学院召开,本次大赛由中国焊接协会和中国职工焊接技术协会联合主办,中国机械工程学会焊接分会、美国焊接学会、北京工业大学和兰州理工大学协办,山东奥太电气有限公司、库卡机器人（上海）有限公司和上海库茂机器人有限公司为支持单位,中国焊接协会教育与培训工作委员会和兰州职业技术学院承办。大赛共有来自全国各地
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发布时间：2023-03-29 - 摘要：<正>2018年11月3日,中国焊接协会在深圳召开了第十六届中国焊接之桥（深圳佳士）行业发展论坛,本次会议主题是"发展高端产品推动技术创新"。中国焊接协会原理事长张德邻,中国机械工程学会监事长宋天虎,国资委协会党建局处长龚治刚,中国焊接协会副会长兼秘书长李连胜,中国焊接协会副会长卢振洋、冯美娟、柳铮、王春生、王鲁君、陈清阳、谢伟新等领导以及常务理事、理事等共计约150人参加了会议。
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发布时间：2023-03-29 - 摘要：<正>随着制造业升级换代,焊接的发展之路应该如何前行?为此,成都电焊机研究所、成都智能焊接装备行业协会借中国机械工程学会在成都召开年会之际,于2018年11月11日特别邀请了我国著名的焊接行业专家和领导——中国机械工程学会宋天虎监事长,与大家一起分享和探讨面临材料技术的发展、数字化及智能化的推广,焊接技术、装备、材料发展的科学之路;同时参观成都熊谷加世电器有限公司。
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发布时间：2023-03-29 - 摘要：<正>Hypertherm海宝发布X-Definition系列等离子切割系统新成员——XPR170。这台全新170安培等离子切割系统和XPR300是全球仅有的两款X-Definition级系统。集工程科学前沿技术以及高精细等离子工艺于一体的X-Definition级等离子系统,可以实现低碳钢、不锈钢和铝材的高品质切割。实验室测试,低碳钢薄板切割质量可稳定在ISO-9013范围2,在切割较厚的板材时,有更多的切割可达到ISO范围3的质量标准。跟之前发布的XPR300—样,新的XPR170含有多项专利
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发布时间：2023-03-29 - 摘要：The welding technologies of aluminium alloy and steel are becoming hot spot because of the requirement of lightweight and security for cars. Several kinds of spot welding technologies have been used since the metal sheets are commonly thin and lapped for welding in automobile manufacturing area. The weldability of aluminium alloy and steel is analyzed. Then the study state of several common spot welding technologies such as resistance spot welding,friction stir spot welding and ultrasonic spot welding is reviewed.The focus is on the microstructure characters and the mechanical performance of Al/steel dissimilar joints.关键词：aluminium;steel;dissimilar metals;welding
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发布时间：2023-03-29 - 摘要：A series of welding experiments of 2205 duplex stainless steel welding using SMAW with different heat input were carried out. Various physical and chemical properties were tested in order to know the welding characteristics of 2205 duplex stainless steel.The test results show that the increase of heat input will lead to the decrease of ferrite content in the weld area,and strength tension of weld joint will decrease and toughness increase;the heat affected area is the weakest area of the welded joint for the pitting resistance.The weld joint of duplex stainless steel can obtain well comprehensive properties if we control the welding parameters reasonably.关键词：duplex stainless steel;welding;properties of weld joint;heat input
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发布时间：2023-03-29 - 摘要：AP1000 is the third-generation nuclear power technology introduced from Westinghouse in China. The CAP nuclear power is the third-generation nuclear power technology that is based on the digestion and absorption of AP1000 nuclear power technology and has independent intellectual property rights. As ASME code class I component,in order to ensure the smooth development at site and meet the installation quality of the main pipe,a physical simulation of 1:1 ration is conducted before the formal installation,which is to simulate the process of machining,fitting,and welding about single loop main pipe. Through the 3D modeling technology,the construction process is monitored in real-time,the control measures,crafts and results meeting design requirements is verified,so as to accumulate experience for the formal construction of the main pipeline.关键词：main pipe of nuclear power;full-scale simulation;3D modeling;laser tracking apparatus;fitting
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发布时间：2023-03-29 - 摘要：Underwater oil tree is the key equipment for marine water and oil development. Due to the long-term blockade of the design and manufacturing technology of offshore oil and gas exploration equipment in the United States,the design,manufacture and testing of marine trees depend entirely on foreign countries. The complex structure of the tree causes a large degree of welding restraint and a large increase in welding stress. The welding structure,the process,and the design of the welding groove will affect the welding quality. The hardness of welded joint of underwater oil tree has always been the focus of attention.In this paper,the hardness changes of the used materials sa-516 gr.70,GMAW welding conditions,different line energy and different welding joints of the welding joints are studied. The optimum welding parameters and heat treatment temperature were found by experiment.关键词：oil tree;line energy;GMAW;welding stress;post weld heat treatment
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发布时间：2023-03-29 - 摘要：The application and research of laser welding technology for stainless steel car body of railway vehicle are discussed. First,the present situation and development history of laser welding for stainless steel car body are introduced. Then,starting from the welding principle,welding method and welding influence factors of laser welding technology,based on the laser welding technology of leading enterprises in railway vehicle industry,the laser welding is introduced. The advantages and disadvantages of laser welding technology for stainless steel car-body and its testing principle are illustrated from the analysis of the microstructure properties of material after welding by using the relevant technological test data.关键词：stainless steel;laser welding;welded joint
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发布时间：2023-03-29 - 摘要：The nuclear island of a new nuclear power plant is designed according to the standard of a foreign country. The material used in equipments,components and structures of the nuclear island shall conform to ASTM,ASME or other codes and standards. During the construction of the subject project,in order to lower the construction cost and shorten the procurement period,some metal materials procured from domestic manufacturer brought material substitution into being,for example,in some cases,some American standard materials were substituted by Chinese standard materials,or other American ones. This paper outlines the material substit-ution issue during the construction of the new nuclear power project. It describes the causes,purposes and requested principles for material substitution,including performance equivalence,code and specification permission,and additional design coordination measures in detail. It also describes the classification,enumeration and analysis of typical cases in regards to material substitution. Besides,based on the method and sharing pointed in this paper,the standardized material substitution process can be formed in nuclear power project construction which can provide reference for material substitution in the acquisition of similar technology or the export of projects.关键词：nuclear island;metal material;substitution;analysis
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发布时间：2023-03-29 - 摘要：Offshore platform,which is also called module,like a kind of huge traditional offshore steel structure,comprises various disciplines such as structure,pipeline,mechanical equipment,etc.,and it is usually composed of multi-layer deck. Structural discipline is the fundamental discipline which is at the front end of the whole platform construction process. It includes the column,plate girder,H-shape and some other kinds of structural parts. The size of structural discipline basically decides the whole platform size.The construction of offshore platform usually includes pre-fabrication and final assembly. In design stage,each layer of deck is divided into several panels to be prefabricated,and then,these panels are assembled into a layer of deck by transportation and hoisting and other production links. Thus,there are a lot of factors existing in the construction can affect the size of the platform. The size control of platform construction is discussed in detail.关键词：offshore platform;size control;measurement
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发布时间：2023-03-29 - 摘要：The indirect spot welding test is carried out with 0.1 mm enameled wire and 0.2 mm copper foil. Under the condition of constant welding current and time,the influence law of different welding pressures on welding quality is studied. The welding quality is comprehensively judged by observing the appearance of welded joint,measuring the size and breaking force of welded joint,and the formation mechanism of welded joint is analyzed combining the microstructure. The test results show that with the increase of welding pressure,the breaking force of welded joint increases gradually first,and then decreases gradually after reaching the peak value;the width of welded joint increases linearly,and the degree of the melt of paint film is high,but the length of welded joint does not change significantly.关键词：enameled wire;indirect spot welding;welding pressure;joint quality
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发布时间：2023-03-29 - 摘要：The microstructure and properties of the butt joint of repair welding of 6 mm 6005 A-T6 aluminum alloy plate for railway vehicle are studied by using the rapid thermal start-up technology（RTS）. The results show that the microstructure of the original welds are dendritic crystal and equiaxial dendritic crystal,the grains are fine,and the microstructure of the weld is composed of α-Al matrix and Mg2 Si,Al0.7 Fe3 Si0.3 second phase;the original weld is affected by the weld thermal cycle of repair welding,the α-Al matrix grains begin to coarsening,and the microstructure deterioration and grain coarsening of the original weld are more serious after three times of repair welding,and more equilibrium phase precipitates out. At the common boundary of the repair welding weld and original weld,as the times of repair welding increases,the grain coarsening is more obvious and the microstructure of interface tends to deteriorate;Using once RTS（80 ℃） repair welding technology before welding,it can be more obvious to reduce the pores caused by the normal repair welding,and at the common boundary of repair welding weld and original weld,the grain coarsening is not obvious,its microstructure is superior to that of once normal repair welding. There are obvious softening zones in as-welded joint and repair welded joint,the minimum HV0.1 hardness value appears in the heat-affected zone of the original welded joint. The tensile specimens of repair welding joints break at 45°,and the fracture has obvious dimple,which is a typical ductile fracture. The strength coefficient of the original joint and the once repair welding joint by RTS is 0.6,and except the welded joint after three times repair welding,when the bending angle of welded joint is 180°,bending specimens have no cracks,and the plasticity of welded joint is good.关键词：6005A-T6 aluminum alloy;high speed pulsed MIG welding;RTS technology;microstructure and properties of welded joint
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发布时间：2023-03-29 - 摘要：Plug welding experiment is carried out with ER308 welding wires for1.5 mm ferritic stainless steel 1.4003 and 3 mm weathering resistance steel. The microstructure analysis, microhardness test and pulsating tensile fatigue test of plug welding joints are carried out. The result shows that the microstructure of nugget zone of plug welding joint is δferrite+austenite,the microstructure of heat-affected zone（HAZ） of stainless steel 1.4003 is granular ferrite,grain size is 3～4 class,and the grain growth phenomenon is relatively obvious. The microstructure of HAZ of Q345 NQR2 steel is pearlite + a small amount of ferrite. The hardness of nugget zone is the highest,and the hardness of side HAZ of stainless steel 1.4003 is slightly lower than that of the nugget zone,while the hardness of side HAZ of Q345NQR2 significantly increases. Under the condition of cycle life of 1 ×107,the median fatigue strength of plug welding joint is 1.675 kN,and the fatigue cracks start at the edge of nugget zone between the two plates,the main reason is that this place is affected by both tensile stress and shear stress.关键词：weathering resistance steel;ferritic stainless steel;microstructure;fatigue property;plug welding
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发布时间：2023-03-29 - 摘要：The finite element software is used to simulate the welding process of the body side wall of EMU at 400 km/h. The results show that when simulating the simultaneous welding by double manipulator arms,the postwelding deformation is the smallest under the condition of uniform distribution of special fixtures. The deformation presents a circular arc arched in reverse, and the both sides are symmetrical taking middle section as the center,and the maximum deformation is 5.13 mm. The actual welding test results coincide with the simulation results,the deformation trends are the same,and the deformation deviation is less than 0.5 mm. According to the deformation results,the predeformation is prefabricated and the postwelding deformation reduces further. The maximum postwelding deformation is 1.5 mm when the predeformation is 6 mm.关键词：side wall;welding deformation;simulation;predeformation
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发布时间：2023-03-29 - 摘要：The traditional arc welding technology of oil drill bit causes serious damage to the alloy blade and is easy to be detached.Aiming at these problems,the principle and implementation method of welding YG8 cemented carbide and steel by resistance brazing are introduced. The possible defects in the implementation process are briefly analyzed and the solutions are given in detail. The test shows that this method can completely overcome above shortcomings and meet the requirements of the welding of oil drill bit. It is an advanced and practical production technology.关键词：cemented carbide;resistance brazing;oil drill bit
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发布时间：2023-03-29 - 摘要：The intergranular corrosion rate index of the Incoloy825 nickel base alloy equipment can not meet the design requirement by using conventional welding technology in domestic nuclear chemical industry. Aiming at this problem,the solutions are proposed to improve and optimize the welding technology and welding material,such as using argon tungsten arc welding to weld the last run,water cooling method for the back of weld and welding material E/S Ni8025 instead of E（R）NiCrMo-3. Finally,the test results meet the qualified index of design requirements. This can provide reference for the welding technology of Incoloy825 nickel-base alloy.关键词：nickel based alloy;welded joint;intergranular corrosion
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发布时间：2023-03-29 - 摘要：The two-dimensional grain growth process is simulated by phase field method. The grain radius, distribution characteristics of grain edge number,and the correlation between grain radius and edge number are analyzed statistically. The kinetics and track of individual grain growth are studied. The results show that the distributions of relative grain radius and grain edge number have selfsimilarity. There is a positive correlation between the grain edge number and grain radius. The relationship between the growth rate and radius of individual grain agrees well with Hillert equation.关键词：grain growth;grain radius distribution;grain edge number distribution;phase field method
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发布时间：2023-03-29 - 摘要：With the implementation of the "Made in China 2025" strategy,the field of welding manufacturing has been transformed into an intelligent,information-based manufacturing industry through the promotion of the deep integration of "two industries." The welding practice teaching links with KUKA arc welding robot in a material forming laboratory of fundamental industrial training center of Tsinghua University are discussed,and the application of inquiry learning in practical teaching of arc welding robot is expound,including curriculum design,teaching plan and teaching environment. Through inquiry learning such as experiment,operation,collection,processing information and communication,students can not only master the basic programming operation of KUKA arc welding robot,but also understand the influence of welding parameter on weld forming quality,aiming at strengthening students’ engineering awareness and exploration spirit.关键词：arc welding robot;practical teaching;welding parameter;inquiry learning
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发布时间：2023-03-29 - 摘要：Aiming at the problems of high consumption of traditional welding training material and energy,polluting the environment and being harmful to health,a set of simulation welding training system is designed based on virtual reality to realize the simulation operation of arc welding. The training system hardware includes welding platform,control host,simulation welding gun,video glasses and so on. The main purpose of the software is to enable trainees to complete the actual welding training courses in "virtual reality".The system provides a variety of different workpiece form selections,so that the trainees can practice different weld forms and welding positions. This system has simple operation and a full range of vision,provides a useful learning method for schools and training institutions and is a supplement to traditional welding teaching activities.关键词：virtual reality;simulation welding;training system;research
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发布时间：2023-03-29 - 摘要：<正>书号:0226售价:38.00元本教材以焊接结构制造工艺过程为主线,全面论述焊接结构制造中的工艺规程编制、备料加工、装配焊接及装备、典型焊接结构的制造技术、质量控制与检测、焊接生产环保和安全等五大板块,共8章。本教材较全面地反映了焊接结构制造的新技术、新方法和新装备。本教材可作为普通
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发布时间：2023-03-29 - 摘要：<正>书号:0023售价:58.00元本书介绍了逆变式弧焊机相关的基本电路、功率器件、高频变压器设计及铁磁性材料、高频电容器、PWM集成控制电路、电流传感器、新型绝缘材料等基础知识,同时对逆变式弧焊机发展过程中存在的可靠性、节能、电磁兼容等一系列热点问题进行了探讨和论述,并通过对目前具有代表行的各种逆变式弧焊机的具体描述,反映其市场动态和现状,跟踪逆变式弧焊机的最新发展
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发布时间：2023-03-29 - 摘要：<正>书号:230定价:34元本书是为满足普通高等教育"材料成型及控制工程"专业毕业后从事焊接技术工作的学生、材料加工工程专业焊接方向的研究生了解和掌握焊接专业基础知识,以及企业开展焊接工程师培训和焊接工程技术人员自学焊接专业基础知识的需要而编写的"焊接工程师系列教程"之一。主要内容有:焊接电弧的电特性和焊接工艺对弧焊电源的要求,弧焊电源
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发布时间：2023-03-29 - 摘要：<正>征文主题:a、核电焊接——核安全监管及核安全文化针对安全监管部门开展政策、法规和核安全监管、核安全文化的宣讲和讨论。b、核电焊接——标准/规范针对标准规范中使用存在的问题进行讨论,探讨我国核电焊接标准的未来发展思路。c、核电焊接——焊接材料研讨焊接材料在核电领域的使用情况、存在问题以及焊材国产化及焊接材料的基础研究。d、核电焊接——质量控制
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发布时间：2023-03-29 - 摘要：<正>《电焊机》杂志是中国科技论文统计源期刊（中国科技核心期刊）、《中文核心期刊数据库》收录期刊"、英国《科学文摘》（INSPEC）来源期刊""俄罗斯《文摘杂志》收录期刊""美国《剑桥科学文摘》（CSA）收录期刊""波兰《哥白尼索引》（IC）"收录期刊等。各地邮局均可订阅,邮发代号:62-81,订价:15元/月,180元/年。
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发布时间：2023-03-29 - 摘要：<正>征文主题:国内外焊接机器人发展现状和前景;机器人弧焊、点焊、激光焊接与切割、复合连接技术等;机器人焊接技术及工艺,包括CAD/CAM、焊接柔性制造、焊接敏捷制造、焊接环境与过程信息获取、焊接工艺数据库、焊接过程自主规划和自适应、焊接质量在线检测、焊接设备通讯协同等;机器人焊接的关键功能部件、传感器、弧长及焊缝跟踪、摄像及监视系统、视频化及AI;机器人在线监控、程序优化、与制造MES兼容、离线编程、使用及异常处理等;
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发布时间：2023-03-29 - 摘要：<正>征文主题:国内外新型金属材料焊接工艺性及相应焊材的开发与应用异种材料连接技术高效、高性能的焊接材料焊接冶金基础理论高强钢、耐候钢、管线钢焊接材料及焊接工艺耐热钢、双相不锈钢、镍基金合的焊接先进焊接工艺及在金属材料焊接中的应用机理焊接工艺与组织性能优化焊接配比在工程中的研究应用轨道交通车辆用金属材料可焊接
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发布时间：2023-03-29 - 摘要：<正>征文主题:国内外焊接仿真技术应用与发展趋势;金属材料焊接温度场与应力场的数值模拟及可靠性分析;焊接结构疲劳性能评估及疲劳行为仿真;微观结构-力学性能计算;焊点可靠性的有限元模拟;焊接热过程模拟仿真系统;焊装数字化规划与设计;焊接变形控制、在线监测及检测;热仿真;机械连接的仿真;
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发布时间：2023-03-29
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