最新刊期
期 2 ， 2019
- 摘要：Several welding methods commonly applied in rail welding are introduced,including their applicable conditions and occasions. The domestic quality control（QC） system of high-speed rail welding is analyzed in consideration of many factors such as materials,welding equipments,technical conditions for on-site welding construction and etc. Based on above,series of strategies to ensure quality of the rail joint are proposed as follows:proper welding method and on-site construction technologies should be applied to grantee the joint quality;optimal welding combinations should be adopted to improve the quality and efficiency of on-site rail welding;thermit welding is suitable for in situ rail welding and other space limited occasions;numerically controlled gas pressure welding should be applied in locked rail welding of assembled joints,and flash-butt welding is suitable for the rest occasions. After issue analysis of flash-butt welding equipments at home and abroad,a few trends for flash-butt welding equipments and technologies are listed to help ensuring high quality of rail joints.关键词：rail welding;quality control;flash-butt welding;gas pressure welding;thermit welding
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发布时间：2022-03-15 - 摘要：Al-Li alloy is a new type of aluminum alloy with low density,high specific strength and corrosion resistance. It is an ideal material for realizing lightweight in aerospace field. Friction stir welding technology,as a new solid-phase joining technology,can effectively reduce the defects such as porosity and thermal cracks in fusion welding of al-li alloy,and has a wide application prospect in the field of al-li alloy welding. The friction stir welding technology of al-li alloy,the microstructure and properties of welded joints and the research status at home and abroad are summarized,and the future development of friction stir welding technology of al-li alloy is prospected.关键词：aluminum lithium alloy;friction stir welding;welding technology;microstructure;mechanical properties
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发布时间：2022-03-15 - 摘要：The entire roof of the universal studios station of the East extension project of Beijing metro line 7 is based on the main structure of the box,the umbrella column joints of the circular tube conversion box is used as the core supporting member of the entire roof structure. Its welding quality and machining dimensional accuracy are particularly important. From the perspective of processing and production,the key points and difficulties of the umbrella column joints are deeply analyzed,the interpass tearing cracks and welding sequence tending toward dimensional control are prevented,the operability of the umbrella column joints and the reliability of the structure are ensured. This provides some reference for futrure processing of the umbrella column joints.关键词：umbrella column;interpass tearing;multi-layer multi-pass welding;internal stress
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发布时间：2022-03-15 - 摘要：The 2A14 T6 aluminum alloy with a thickness of 5 mm is welded by FSW and VP-TIG respectively,and the characteristics of the welds are studied. The results show that both welding methods can obtain welds that meet the requirements of the corresponding standard level I. There are tiny holes inside the VP-TIG welded joint,and the grains are coarse. The microstructure of FSW welded joints is dense,the grains are fine,and the grain size of the HAZ on the retreating side is significantly larger than that on the advancing side. The minimum hardness of the VP-TIG welded joint is 92.8 HV0.2/20,which is located in the center of the weld. The minimum hardness of FSW welded joint is 104.2 HV0.2/20 and is located at the junction of TMAZ and HAZ on the retreating side. The VP-TIG welded joint has a strength coefficient of 0.63 and an elongation of 4.7%,the fracture occurs in the HAZ. The FSW welded joint has a strength coefficient of 0.8 and an elongation of 5%,the fracture occurs at the junction of TMAZ and HAZ on the retreating side. These two kinds of fractures are ductile fracture.关键词：2A14 T6;FSW;VP-TIG;microstructure;mechanical properties
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发布时间：2022-03-15 - 摘要：In view of problems such as harsh condition,high-cost and high-risk in experiments in the research of reactive power compensation for impact load,a TSC dynamic reactive power compensation hardware-in-the-loop simulation system based on QuaRC platform and DSP is proposed. According to working characteristics of typical impact load,spot-welders,experimental subject is established in the simulation environment,and a reactive power compensation strategy is selected and implemented in the DSP.Simulation result conforming with actual conditions,the reasonability of the design of the system is verified.关键词：impact load;spot-welder;thyristor switch capacitor;reactive power compensation;hardware-in-the-loop simulation system
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发布时间：2022-03-15 - 摘要：A CaO-CaF2-TiO2 basic slag system was designed,ERNi Cr Mo-3 was selected as the welding core,to prepare nickel base electrode JWENiCrMo-3 suitable for Inconel625 alloy welding. The amount of alloy component in the coating was adjusted,optimizing the ratio of metal alloy elements,several Ni-Cr-Mo alloys with different alloy contents were obtained,the mechanical properties,crack resistance and high temperature oxidation resistance were studied.关键词：slag system;nickel base electrode;mechanical properties;crack resistance;high temperature oxidation resistance
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发布时间：2022-03-15 - 摘要：<正>为确保杂志质量,尊重和保护作者及他人的知识产权、著作权,构建公平合理、规范健康的学术平台,严格杜绝"学术不端行为"发生,《电焊机》杂志特作以下声明。1、从本声明公布之日起,凡向本刊投稿,作者均应严格遵守《中华人民共和国著作权法》《中华人民共同和知识产权法》等国家有关法律法规,来稿如出现以下任何情况:抄袭剽窃,篡改他人学术成果,伪造或篡改数据、文献,捏造事
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发布时间：2022-03-15 - 摘要：<正>尊敬的专家、学者、企业家和朋友们:为推动行业企业的技术创新,促进焊接装备研究成果转化和应用,为会员企业产品推广服务,专委会拟定于2019年4月1日在第33届中国焊接博览会期间召开"2019’绿色高效焊接技术论坛——焊接技术创新成果及应用"焊接技术交流活动。论坛以焊接装备的"创新升级、促进应用"为主题,围
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发布时间：2022-03-15 - 摘要：<正>2019年5月11～13日中国·广州指导单位中国焊接协会中国焊接学会主办单位中国焊接协会焊接设备分会成都电焊机杂志有限公司承办单位东方电气（广州）重型机器有限公司深圳市麦格米特焊接技术有限公司四川大西洋焊接材料股份有限公司《电焊机》杂志
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发布时间：2022-03-15 - 摘要：<正>为更好宣传机械工业改革开放40年发展成就,中国机械工业联合会党委组织开展了系列庆祝活动。其中"改革开放40周年——机械工业杰出产品"选树活动,旨在通过集中征集宣传一批标志性产品,充分展现机械工业拼搏奋斗的发展轨迹,展示广大企业创新进取的重要成果,以扩大
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发布时间：2022-03-15 - 摘要：The CuCrZr used for welding arm of manual spot welder has the characteristics of excellent high temperature properties,high electrical conductivity and long service life. The composition of CuCrZr was optimized,and the microstructure of the material before and after optimization and related mechanical properties are tested. The comparison analysis shows that by properly reducing the Cr content in the material and increasing the Zr content,the crystal structure of the material can be refined. Dispersed Cu-Zr particles in the copper matrix can effectively prevent the disappearance of dislocations and the grain boundary slippage. Therefore,the elastic modulus and yield strength of the material can be improved. The optimized CuCrZr material can effectively reduce the electrode deformation during welding.关键词：manual spot welder;welding arm;CuCrZr
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发布时间：2022-03-15 - 摘要：The work characteristics of the current mode converter under the conditions of high input voltage and low output voltage,that is, low duty cycle and light output load are introduced. The minimum On time of PWM converter decided by the duration of leading edge blanking time and current detection time delay is discussed. At a certain frequency,the minimum On time decides the maximum critical input voltage. At light output load,when practical input voltage is close to the maximum critical input voltage,the system goes into the voltage mode from the current mode and oscillates due to insufficient phase margin at feedback link. When practical input voltage exceeds the maximum critical input voltage,the system is forced into skipping pulsed mode,thus the oscillation and big output ripple appear. According to the characteristics of entering voltage mode at light output load,the solution with using output electrolytic capacitance is proposed,the corresponding results and waveforms are given,and the reasons why the phase margin increases by using output electrolytic capacitance is also explained.关键词：current mode;voltage mode;duty cycle;skipping pulsed mode
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发布时间：2022-03-15 - 摘要：Liquid cooling device is one of the auxiliary equipments of welding equipment,which plays an important role in guaranteeing the quality and effect of welding equipment. By analyzing the working principle of the device,the overall design scheme of the data acquisition system is defined. STM32 F103 RCT6 chip is selected as the embedded processor to design the hardware circuit and humancomputer interaction interface. The design idea and method of the data acquisition,processing and communication program of the liquid cooling device for welding equipment are also introudced,the state management of the liquid cooling device of welding equipment is realized,and a data acquisition system of the liquid cooling device for welding equipment with low cost,strong reliability,convenient operation and good human-machine interaction is developed.关键词：welding equipment;liquid cooling device;STM32F103;human-machine interaction
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发布时间：2022-03-15 - 摘要：The tensile test were conducted at low-temperature and elevated temperature by using the chamber and temperature furnace to obtain the parameters of 6082-T6 aluminum alloy,such as the tensile strength,yield strength,elastic modulus,elongation and Poisson ratio,and then the tensile fracture was observed to analyze the fracture process. The test results show that the tensile strength,yield strength and elastic modulus of 6082-T6 aluminum alloy sheet decrease with the increase of temperature,while the elongation increases with increasing temperature. When the temperature is higher than 400 ℃,the material presented softening characteristic and the trend of elongation is significant.关键词：6082-T6 aluminum alloy;low and elevated temperature;mechanical property
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发布时间：2022-03-15 - 摘要：Microstructure,mechanical properties and electrochemical corrosion properties of bobbin-tool friction stir welding（FSW）for the 7075 aluminum alloy were studied. The results show that,the welding zone is composed of weld nugget,thermo-mechanically affected zone,heat affected zone and base metal. The weld nugget is composed of fine equiaxed grains,the heat affected zone is composed of coarse deformed grains and the heat affected zone is coarse microstructure of base metal. Due to grain refinement and mechanical work hardening,the hardness of welding zone is markedly improved. However,the tensile strength has no significant increase,which is only 267.84 MPa. The boundary of retreating side and base metal is fuzzy,consisted of inhomogeneous mixed-grain microstructure,which is responsible for the low strength. The corrosion resistance of the surface perpendicular is better than that of the parallel to the weld joint,but the corrosion resistance of the welding zone is worse than that of the base metal.关键词：7075 aluminum alloy;bobbin-tool FSW;microstructure;mechanical properties;corrosion resistance
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发布时间：2022-03-15 - 摘要：For the microstructure evolution mechanism study and control problems of welded joints in welding process,the study based on numerical simulation method has been used to analyze the microstructure growth and evolution rule of welded joints and it has been increasingly received attention. Several numerical simulation methods which have been well used for microstructure are summarized,and their principles,characteristics and application are analyzed,and the possible research directions are discussed.关键词：welded joints;microstructure;numerical simulation
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发布时间：2022-03-15 - 摘要：The application of U20 Mn bainte/martensite duplex-phase rails with high strength and wear-resisting in heavy-duty lines is restricted by the poor quality of flash welding. Using the special device which assembled high-frequency induction on the hydraulic press to weld small U20 Mn rail samples,simulating heating and forging process of gas pressure welding. Doing plastic pressure welding experiment under the process of same heating input and forging length,different forging velocity. Metallurgical welding behavior of welding crystallization and fracture feature at welding interface were observed and researched. The results show that bainte/martensite duplex-phase rails can realize metallurgical welding under the condition of plastic heating,forging length（5～7 mm）,forging velocity is less than 6 mm/s. However,with the forging velocity increases,the grain size of the weld metal interaction crystallization becomes smaller,the difference between the grain size and the parent grain become greater,the degree of brittle fracture are greater.关键词：bainte/martensite duplex-phase rails;plastic;pressure welding;weldability
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发布时间：2022-03-15 - 摘要：Three-point bending fatigue test and fracture micro-analysis are used to study the fatigue performance of typical welded j oints of bogie welding for railway express truck with different as-weldeds（without processing） and different postweld treatments. The results show that the fatigue strength of full penetration T-type welded joint is 146.25 MPa. The fatigue strength of the joint after the polishing of weld toe is 165.75 MPa. The fatigue strength of the joint after the shot blast of weld toe is 180.45 MPa. The fatigue strength of the joint after the polishing + shot blast is 203.75 MPa. Through polishing,shot blast and polishing + shot blast of the weld toe after welding,the stress concentration at the weld toe of the joint can be improved effectively,the surface tension stress at weld toe is changed into compression stress,and the fatigue strength of fully penetration T-type welded joints is improved significantly.关键词：welding bogie;welded joint;fatigue performance
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发布时间：2022-03-15 - 摘要：Due to the problems that the groove rails need to be repaired in the field during the service process such as wear and fatigue,special welding wire and special automatic welding repair equipment are selected. On the basis of the optimal surfacing welding process parameters explored by the failed orthogonal test of the single-layer surfacing welding,discussing the feasibility of multi-layer welding repair process,and the organization and performance level of surfacing layer. The results show that under the preheating condition of300 ℃,in the heat affected zone of the single-layer welding layer,martensite is inevitable. But with the welding voltage of 31 V,wire feed speed of 220 mm/s,and welding speed of 8 mm/s,the martensite content in the heat-affected zone of the surfacing layer is the lowest. The microstructure of the heat affected zone in these multi-layers are pearlite,and there are no cracks,pores,and other defects in these layers. Welds are well-formed,the microstructure of welds are austenite,and their hardness values are well matched to the parent metal;the polymer damping material properties are not obviously effected by heat generated by welding repair process.Therefore,multi-layer welding repair technology has good process feasibility.关键词：groove rail;service damage;online welding;repairing technology
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发布时间：2022-03-15 - 摘要：The P-GMAW is carried out on a 5083 aluminum alloy sheet with a thickness of 10 mm. Under the condition of welding current of 240 A,the arc shape,metal transfer and molten pool behavior during P-GMAW process with or without external longitudinal magnetic field are compared. The results show that the external magnetic field causes the arc to rotate rapidly,the arc length becomes shorter,the droplet is rotated by the tangential force,the neck is obviously constricted during the droplet transfer,and the gray floating object appears on the surface of the molten pool. The corrugation on both sides of the molten pool is uneven,and the contour of molten pool is shifted to one side;the external longitudinal magnetic field does not change the symmetry of arc shape and metal transition,but the molten pool is subjected to an external electromagnetic force,which affects the symmetry of the molten pool flow,thereby the weld offset appears.关键词：external longitudinal magnetic field;aluminum alloy P-GMAW;arc shape;metal transfer;molten pool behavior
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发布时间：2022-03-15 - 摘要：Welding process test of 6 mm pure nickel N6 plate is carried out by plasma arc welding（PAW）. Based on a large number of technical tests by orthogonal design in earlier period,the welding parameters are optimized with statistical product and service solution software（SPSS）. The results show that single pass double formed welding joint of 6 mm pure nickel N6 plate can be achieved by PAW. Welding current has the most significant effect on tensile strength of joint,followed by plasma gas flow and the third is the welding speed. So optimal process parameters obtained by orthogonal test design are as follows:welding current 175 A,welding speeding 170 mm/min and plasma gas flow 1.5 L/min. Average value of tensile strength of joint welded by those parameters can reach302 MPa,which is up to 87.3% of the strength of base material and above result illustrate that the parameters obtained by orthogonal test design are reliable.关键词：pure nickel N6;plasma arc welding（PAW）;process parameters;orthogonal test
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发布时间：2022-03-15 - 摘要：When the big pipe（φ133×10 mm） is fixed and butted at 45 degrees,the welding position of the pipe is between the horizontal fixed pipe and vertical fixed pipe. The welding is always carried out in the inclined position of pipe,which increase the operative difficulties. When using hybird gas solid wire with low current,the shallow penetration will easily form inclusions and dot defects,and the form is difficult to control when the current is too high. The experimental study is conducted for how to improve the appearance and internal quality,the welding specifications,angles and swing methods,interpass arrangement and welding skills are emphasized,which plays a guiding role in training teaching and production practice.关键词：appearance of weld;internal quality;welding technology
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发布时间：2022-03-15 - 摘要：In order to realize the assembly and welding of large arched box steel structures,a tooling was developed,which was used for submerged arc welding,and the welding process and welding deformation were studied. The results show that when the welding gun inclination angle θ is in the range of 7°～10°,the incomplete penetration at the root of the weld can be reduced. In addition,the two welds on one side of the box structure are welded simultaneously in the same direction,inverted after welding,and then welded simultaneously in the same direction to the two welds on the other side,and the welds on the upper and lower sides are measured by measurement. The shrinkage occurs simultaneously in the lateral direction,the shrinkage amount is 2 ～4 mm,and there is almost no change in the vertical direction,and the difference between the two diagonal dimensions is not more than 2 mm. In summary,under the above-mentioned tooling and process welding,the welding deformation is controlled to meet the engineering requirements.关键词：arch;box structure;SAW;welding process;welding deformation
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发布时间：2022-03-15 - 摘要：With the progress of laser technology,and laser technology applied more and more widely. Currently laser brazing and laser welding is mainly used in the manufacture of automobile,for door,bodyside,roof,decklid,bodyside surrounded water tank and other components. This research mainly introduces the application of laser brazing and laser welding in the automotive industry from the aspects of equipment composition,process and quality control.关键词：laser brazing;laser welding;quality control;body manufacture
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发布时间：2022-03-15 - 摘要：T2/Q345 steel-copper dissimilar metal welded joint is fabricated by argon tungsten arc welding with nickel-based welding material. X-ray diffractometer,metallographic microscopy,scanning electron microscopy,microhardness tester and universal materials tester are used to analyze the microstructure and properties of the welded joints. Weld metal and base metals on the both side in welded jonit have excellent physical and chemical compatibility. Weld metal consists of face-centered cubic γ phase with the apperance of columnar dendrite and equiaxial dendrite. Due to the heat source concentration of argon arc welding and high heat conductivity of the copper alloy,the range of the coarse grained region on both sides of the heat affected zone is very limited. Chemical composition analysis result shows that diffusion of Ni and Cr occurs in the T2 heat affected zone. Tensile testing result shows that the welded jonit fractures in the position of the copper alloy where the microhardness is minimum and the welded joint shows good mechanical properties.关键词：dissimilar metal welding;microstructure;properties
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发布时间：2022-03-15 - 摘要：With the rapid development of nuclear power industry in china,it is imperative to make nuclear power technology and equipment independence,it is necessary to design and manufacture nuclear power equipment independently. For CPR1000,on the basis of the original foreign design,though the introduction,digestion,absorption of domestic design units,the process optimization of domestic manufacturing plants,the experimental development of domestic material suppliers,boron injection tank self-design and independent manufacturing have been realized. In this article,analyzing the chemical component and mechanical property of 20 MnHR of domestic material for boron injection tank and experimenting the property of welding,actualize welding procedure qualification under welding property analyzing,thus the qualified welding procedure specification can be worked out to carry out welding,which can be used in the manufacture of boron injection tank in nuclear station,the welding of domestic material 20 MnHR for boron injection tank can be completed and the independence and localization of boron injection tank can be realized.关键词：boron injection tank;domestic;material;welding
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发布时间：2022-03-15 - 摘要：This paper aims at the difficult problem of repairing and welding the oil leakage of locomotive oil tank in the locomotive depot,through the analysis of the defects which cause oil leakage of the oil tank and the site situation,we develop a reasonable welding process and implement it,then summarize a set of welding operation method for oil tank. The results show that the selection of the correct welding parameters,groove form,and the welding process of manual arc breaking arc welding repair welding oil tank can completely meet the requirements of tank structure design and operating.关键词：manual arc welding;broken arc welding;crack
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发布时间：2022-03-15 - 摘要：In view of short of initiative of accepting innovation and entrepreneurship education and the lack of individualized development of innovation and entrepreneurship abilities for university students,Nanchang Hangkong University and Chongqing University of Science and Technology apply the concept of "Party Construction Plus" to the second class construction of innovative and entrepreneurship talents training for welding technology and engineering major. It aims to strengthen the role of the second class in the innovation and entrepreneurship talent training. Through the construction of the "three-three-two" double-creation talent training system,efforts have been made to improve the enthusiasm of university students to accept innovation and entrepreneurship education,strengthen the practice of double-creationeducation,and improve the double-creation ability of welding technology and engineering major students.关键词：double-creation talent training;welding technology and engineering major;"three-three-two" training system
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发布时间：2022-03-15 - 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
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发布时间：2022-03-15 - 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：2022-03-15
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