最新刊期
期 7 ， 2018
- 摘要：The formation mechanism,influencing factors and control principles of cold lap defects in tandem GMAW welds were discussed. The results show that three types of cold lap are found at the weld toe of the tandem GMAW,their properties belong to the micro lack of fusion defects at the weld toe and may affect the fatigue life of the structure. Welding spatter and the overflow of molten metal are necessary conditions for forming cold lap,and the temperature of spatter,base metal and spilled metal are the sufficient condition for forming cold lap. The relationships between the welding behavior and the cold laps formation in tandem GMAW are established,the key points are that when the stability of arc and the balance of weld pool force are destroyed,the tendency of cold lap defect formation is increased. Four possible process routes to limit the number and size of defects are proposed.关键词：cold lap;tandem GMAW;micro lack of fusion;spatter;overflow;oxides
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发布时间：2023-03-29 - 摘要：In order to gain the basic data for the intelligent welding system,a laser grating vision system is built to measure digital contour of weld bore. Firstly,through the fringe images are analyzed under different working distances and grating projection angles,the preconditions are determined for obtaining grating fringe images representing the contour of weld bore. At the same time,it is discussed how to obtain the information of weld bore contour by means of fringe images when fringes continuous scan. And the established algorithm of laser grating scanning speed and camera exposure interval time provides a decision basis for the determination of system measurement speed and accuracy. Secondly,based on the algorithm of segmentation and refinement of the fringe image,the three-dimensional coordinates of discrete point is gained,the digital contour of weld bore is established by the means of three-dimensional reconstruction. Finally,the verification results show that the system can obtain the digital contour of the weld bore in real time,and the coincidence degree of width or depth values is up to 99.75% between the visual measurement system and the manual measuring.关键词：vision measurement;laser grating;digital contour
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发布时间：2023-03-29 - 摘要：A certain type main generator frame used in railway vehicles is taken as a research objective. The finite element simulation analysis of the frame is carried out by ABAQUS. The static strength is evaluated according to the actual working condition and design requirements;reference to the standards of IIW and EN15085,the fatigue strength and stress factor of the dangerous welds in the generator frame are calculated by the hot spot stress method and the equivalent structural stress method respectively and the results are compared.The results show that: under limited conditions,the maximum Mises stress of the generator frame is less than the yield strength of the base material,so the frame meets the static strength requirement;under the impact and stop conditions,the maximum stress change range of hot spot stress of the dangerous welds in the generator frame is less than the cut-off fatigue limit of the corresponding S-N curve,and the fatigue strength of the frame meets the design requirements. The structural stress at the dangerous weld toe is extracted by FE-SAFE,and the fatigue life of the dangerous weld obtained by the equivalent structural stress method can also meet the design requirements. By comparing the stress factors obtained by the two methods,it is concluded that the equivalent structural stress method can predict the fatigue life of welded structures more efficiently and accurately when the welding structure is complex.关键词：generator frame;fatigue life;hot spot stress;equivalent structural stress
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发布时间：2023-03-29 - 摘要：Industrial pure titanium TA2 due to its excellent corrosion resistance is widely used in the water environment,in the actual production,pure titanium is mostly welded by TIG welding,but slow welding speed leads to low efficiency. The subject of the 0.9 mm TA2 laser welding research,first has carried on the orthogonal experiment of four factors and five levels. These four factors are laser power,welding speed,defocusing and laser incident angle,it is found that laser power and welding speed have the greatest influence on forming;then each factor is analyzed by single factor analysis,found that increasing laser power or decreasing welding speed can suppress the undercut,increasing the amount of positive defocus can reduce the back spatter,forward laser incident is easier to achieve penetration than backward incident.关键词：industrial pure titanium;laser welding;undercut;spatter
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发布时间：2023-03-29 - 摘要：Based on the characteristics of the technology and heat source of double-sided laser beam welding for T-joint,a new heat source consisting of a Gauss surface heat source and a self-adaptive body heat source is presented. The Gauss surface heat source represents the action of the heating effect of plasma cloud above the keyhole surface,and the self-adaptive body heat source represents the action of the Fresnel absorption and inverse bremsstrahlung absorption of the laser energy in the keyhole,and the effects of keyhole on the heat and mass transfer are also considered. Using the FLUENT software,a three-dimensional mathematical model for double-sided laser beam welding for T-joint is established,and the characteristics of the temperature field and keyhole are analyzed. The result shows that the molten pool temperature and keyhole shape distribute symmetrically along the stringer center. The molten pool temperature gradient on the cross section increases as the distance from the center of stinger center increases,especially on the skin side,and the maximum length of molten pool locates the keyhole interacting position rather than molten pool surface,the primary reason is the heat source coupling action of both sides. The simulated results agree well with the experimental results,which proves the accuracy and applicability of the model.关键词：laser technique;double-sided laser beam welding;T-joint;heat source model;numerical simulation;aluminum alloy
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发布时间：2023-03-29 - 摘要：3 mm thick AZ31B magnesium plates are butt welded by CMT technology. The welding parameters:1.6 mm diameter WE-33M feed wire,welding current of 76 A, wire feed rate of 6 m/min,welding speed of 0.8 m/min,weld interval of 1.5 mm. The welding process is stable without spatters and appearance of the weld is fine. The microstructure, microhardness,mechanical properties and tensile fracture appearance of welded joints are observed. The results show that grains in the weld microstructure are refined,the microhardness of the weld zone is the highest,and the average is 86 HV,the microhardness of HAZ is about 62 HV,the base metal about 65 HV. The maximum tensile strength and elongation of welded joint is 248.8 MPa and 7.16% respectively,which are 96.7%and 98.6% of the base metal respectively. The fracture is located in the base metal zone and belongs to ductile fracture.关键词：MT welding;AZ31B magnesium alloy;microstructure;mechanical properties
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发布时间：2023-03-29 - 摘要：Finishing is the most important process of improving the harshness of rail field welded joint. For the problem that the manual rail profiling refiner,nowadays used for the rail field welded joint grinding after welded in our country,has a low efficiency and an unstable grinding quality and the grinding process can’t be accurately controlled,a new shape finishing equipment for rail welded joint has been developed successfully and tested in field railway. The result shows that such an equipment can improve the harshness and surface quality of the welded joint effectively,and develop the joint’s passing rate of the joint harshness steadily. It has a high efficiency and is also applicable to the complex condition of the field grinding work.关键词：steel rail;welding joint;field grinding;harshness
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发布时间：2023-03-29 - 摘要：Summarize a new type of friction stir welding method based on the stationary shoulder,and can gain no thinning surface after welding,by researching the split mixing tools,the implement of welding process,the microstructure and mechanical properties.Under the condition that the shoulder is stationary,the method can not only obtain the welded joint with excellent mechanical properties,but also achieve the intended purpose of no flashing,good surface finish after welding and no thinning,and may broaden the application field of friction stir welding to the welding of aluminum alloy structural parts with strict surface configuration.关键词：aluminum-lithium alloy;friction stir welding;stationary shoulder;no thinning welding
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发布时间：2023-03-29 - 摘要：<正>2017年是实施"十三五"规划的重要一年,是供给侧结构性改革的深化之年。电焊机行业经济运行呈现恢复性增长,发展势头良好。下面就分会秘书处收录的61家电焊机制造企业2017年度的报表数据进行经济运行综合对比分析。2017年和2016年上报数据的企业都是61家,其中有2家企业不同。为了便于对比,做了必要的区分。表1～表4和图1～图3是2017年的61家企业的经济运行数据统计结果和分析;
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发布时间：2023-03-29 - 摘要：<正>中国焊接装备产业高峰会议始于1978年,计划经济时期称之为中国电焊机行业厂长（经理）峰会,后来更名为中国焊接装备产业高峰会议,至今走过了40年的历程,与中国的改革开放完全同步。一路走来,见证了焊接装备行业的发展。两年一届的峰会,集中了焊接装备产业高层人士的智慧,总结焊接装备产业经济运行情况,交流先进的经营管理理念,讨论应对多变的国内外经济形
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发布时间：2023-03-29 - 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：2023-03-29 - 摘要：<正>各会员单位及相关单位负责人:由中西南十省区（市）焊接学会联合会、四川省机械工程学会焊接专委会主办的"第十五届中西南十省区（市）焊接学术会议"定于2018年8月8日在西南交通大学峨眉校区科技交流中心召开。会议主题为"智能焊接关键技术",重点关注机器人技术、接口技术、传感器技术、绿色、优质、高效的电源及装备、材料及工艺。会议将特邀多名焊接行业知
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发布时间：2023-03-29 - 摘要：<正>"环保焊枪技术应用交流会"于2018年6月20～22日在山东省济南市召开,中国焊接协会焊接设备分会,中国电器工业协会电焊机分会,中国焊接协会教育与培训委员会,中国焊接学会焊接环境、健康与安全委员会,天津市焊接学会,天津市焊接行业协会,电焊机行业的部分生产企业及国外专家等共33位代表参加了会议。会议由中国电器工业协会电焊
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发布时间：2023-03-29 - 摘要：<正>汽车工程领域国际盛会AMTS 2018（第十四届上海国际汽车制造技术与装备及材料展览会）于2018年7月7日在上海新国际博览中心圆满落下帷幕。本届展会展示面积超过100,000m2,全球30个国家及地区的673家展商集体亮相,77,537位专业观众到场参观。十四载砥砺风雨,2018展会再创辉煌AMTS展会秉承工匠精神,十四年来专注汽车工程领域,潜心钻研、默默耕耘,成功打造了汽车工程领域一站式展示
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发布时间：2023-03-29 - 摘要：<正>新型喷涂机器人P-40iA紧凑型喷涂机器人,工作半径可达1300mm;防爆标准设计,可满足各种危险环境下喷涂等应用;适配FANUC PaintTOOL软件,可提供喷涂行业中强大和便捷的应用操作程序界面;集成了FANUC最新的R-30iB Mate Plus控制柜。电池化成测试入盘及卸盘M-20iA/35M机器人变成电池入盘和卸盘作业;铸造版机器人伺服电机等敏感区域采用特殊的罩壳配合密封垫圈对其进行保护,
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发布时间：2023-03-29 - 摘要：<正>DeltaSpot电阻点焊设备伏能士独特的DeltaSpot电阻点焊设备,最突出的优点就在于电极带为电极头提供了最佳的保护,避免了来自于板材层的磨损和沉积。无需修磨的电极头使得伏能士DeltaSpot电阻电焊设备可以连续焊接4000～7000个焊点,并保证每个焊点都能使用全新有效的电极,每个焊点100%的重复精度。与此同时利用电极带精确控制热输入量,能够降低50%的能耗,焊接过程稳定,无飞溅。同时,伏能士的DeltaSpot电阻点焊设备
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发布时间：2023-03-29 - 摘要：<正>机器人3D视觉搬运系统MotoSight-3D是安川最新推出的快速3D视觉搬运功能,可以对料筐内任意摆放的工件进行视觉定位、准确抓取,对沾油的工件、带曲面结构复杂的工件都可实现高精确度的识别分拣。视觉重复精度可达±0.1mm。该系统主要应用于螺母凸焊机上料、汽车冲压件上下料、杂乱堆放工件归整码放作业等需求。
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发布时间：2023-03-29 - 摘要：<正>激光焊缝跟踪系统TH6X系列顶尖的焊接技术应对不断增长的产品质量需求,保持高效的工作持续性,以及提升产品竞争力的唯一方式,需使用最先进的生产系统。新兴的技术和系统配置的完美协调TH6X（TH6D和TH6i）光学焊缝跟踪系统配合ABICOR BINZEL系列的焊枪,将自动化焊接工艺提升到一个全新的高度。
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发布时间：2023-03-29 - 摘要：<正>Power clamps夹紧气缸轻量化:所有产品为阳极氧化铝合金外壳和夹紧手臂。轻量化对于机器人抓手减重提升生产效率具有极大帮助。UNIVER每一个汽缸都具有容差功能,不同板厚可以自适应夹紧,非常适合于多车型生产线（不同车型板厚可能不同）以及冲压板材厚度不稳定情况（同一车型不同批次冲压拉延厚度不同）;并可有效的避免生产成由于过夹、夹头不到位、以及夹头磨损造成的停线并对尺寸稳定具有极大帮助。
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发布时间：2023-03-29 - 摘要：<正>C型搅拌摩擦焊设备设备结构紧凑,占用空间小;焊接厚度小,成本低,性价比高小型二维摩擦焊设备采用小龙门结构、刚性好、性价比高;C轴采用蜗轮蜗杆传动方式,传动刚性好;二维随动控制,保证搅拌摩擦焊过程中焊接倾角的恒定要求。中型二维搅拌摩擦焊设备整体采用铸件结构,结构稳定,刚性优良;工作台面积大、通过空间大,适用产品范围广;工作台可根据需求调整
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发布时间：2023-03-29 - 摘要：<正>全自动穿梭式拼焊生产线全自动上下料,节省人力成本;焊接精度高、质量稳定、生产效率高;适用多幅面、多组料焊接;模块化设计,可自由选择。使用范围不等厚板拼焊:TWB;材料厚度:0.5～3.0mm;焊缝长度:100～2500mm;焊接速度:5～12m/min。汽车车身覆盖件激光焊接工作站设备高效稳定、自动化程度高、兼容性好;可选配旋转台、变位机等,实现不同工件及工艺加工切换;单件加工成本低,适用于各种批量生产。
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发布时间：2023-03-29 - 摘要：<正>0前言相对传统工频焊机,逆变焊机在变压器体积、有效功率输出及焊机输出电压、电流稳定性方面部具先天优势,在可预见的未来将逐步占领焊机行业的主导地位。IGBT（Insulated Gate Bipolar Transistor）全称为绝缘栅双极晶体管,作为逆变焊机中高频逆变的主要开关器件,其性能的优劣将直接影响焊机整体表现。随着国内工艺水平和设计能力的提升,国产IGBT开始进入焊机领域。
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发布时间：2023-03-29 - 摘要：Titanium and titanium alloys have the advantages of both steel（high strength） and aluminum（light weight） as well as excellent corrosion resistance. They are widely used in the fields of aviation,aerospace, chemical engineering and metallurgy. The microstructure characteristics of TIG and LBW welded joints are introduced, and the method of evaluating the corrosion resistance of titanium and titanium alloy welded joints is summarized and compared with base material. The study finds that: titanium and titanium alloy welded joint microstructures change or more stable oxide film makes titanium and titanium alloy welded joints have improved corrosion resistance.关键词：titanium;titanium alloy;microstructure;corrosion property
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发布时间：2023-03-29 - 摘要：Wire arc additive manufacturing（WAAM） technology is a high-efficiency and low-cost metal manufacturing method.However,the travel speed of the torch cannot keep constant when fabricating complex parts,which is restricted by varied curvature of the path. Therefore,t is difficult to obtain consistent forming appearance. To deal with this problem,a speed planning algorithm under the technology constraint based on NURBS interpolation is proposed,which considers the allowable speed fluctuation of the WAAM technology. It aims at reducing the speed fluctuation during the manufacturing process and improving the consistency of the forming appearance. The maximum relative error does not exceed 5%,meeting the forming control requirements for arc additive manufacturing.关键词：additive manufacturing;speed planning;interpolation algorithm
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发布时间：2023-03-29 - 摘要：The 2A14 aluminum alloy is widely used in aerospace industry,especially for the manufacture of rocket fuel tanks,due to its good mechanical properties and resistance to stress corrosion from -250 ℃ to 250 ℃. In this paper,3-mm-thick 2A14 aluminum alloys were welded by the VPTIG arc welding,which were used to study the nonuniformity of microstructure and mechanical properties. The results show that grains in the weld are dendritic equiaxed grains,while the solid solution zone are coarse. The overaging zone and the base metal are flat. The content of alloying elements in the matrix of the weld zone is low,therefore the solid solution strengthening effect is weakened. At the same time,eutectic structures precipitate along the grain boundaries. The content of alloying elements in the heat-affected zone and the base metal matrix is relatively high. It can be seen from the microhardness measurements that the weld is almost the weakest zone in the joint. Moreover,base on the regression analysis,linear correlations among the yield strength and microhardness are established,σ0.2=2.94 HV-78.71.关键词：2A14 aluminum alloy;VPTIG;microstructure;mechanical properties;nonuniformity
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发布时间：2023-03-29 - 摘要：Through the analysis of the microstructure, hardness test,pulsating tensile fatigue test and the analysis of fatigue fracture morphology,this paper studied the microstructure and fatigue performance of resistance spot welding joint of 1.5 mm Q310 and 3 mm Q345. The results show that,the microstructure of Q310 and Q345 are similar,the base organization is pro-eutectoid ferrite and pearlite,the microstructure of HAZ is a few ferrite and pearlite. The microstructure of nugget area is lath martensite and bainite. From the nugget area to the base material,the hardness value distribution is in a step downward trend,the hardness value of nugget is the highest of the whole joint. The fatigue fracture is located in the nugget area. And the type of fatigue fracture is mixed with micropore and cleavage,the main cause of fatigue fracture is stress concentration.关键词：weathering resistant steel;resistance spot welding;microstructure;fatigue performance
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发布时间：2023-03-29 - 摘要：Through the analysis of the microstructure,hardness test and pulsating tensile fatigue test,study the microstructure and properties of the plug welding joint of Q310NQL2 and Q345NQR2 corrosion resistant steels. The results show that,when the ER50-G mild steel welding wire is used for plug welding process,the structure of plug weld nugget zone is pearlite,ferrite and Widmanstatten structure. In the heat affected zone the pearlite become larger because of overheating. The hardness of nugget zone is the highest in the whole joint,and the hardness of heat affected zone relatively decreased,but the softening phenomenon is not obvious. The fracture of pulsating tensile fatigue specimen is located at the root of the side nugget zone of thin plate. The brittle structure and stress concentration here are the main causes of fatigue fracture.关键词：weathering resistant steel;microstructure;fatigue property;plug welding
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发布时间：2023-03-29 - 摘要：During disk laser welding bead-on-plate welding of type 304 austenitic stainless steel plates,a near infrared band highspeed camera,an ultraviolet band high-speed camera and a visible light band high-speed camera are used to capture the dynamic images of the keyhole,plume and spatters in the laser welding at the same time. The keyhole,plume and spatters are defined as the characteristic parameters of welding process,and the dynamic characteristics are considered as the output parameters of the neural network,and the weld width is considered as a parameter reflecting the welding status and the input parameter of the neural network. A technique that uses multifeature information fusion of keyhole,plume and spatters to obtain the welding status of high-power disk laser welding based on neural network technology is presented. The defined keyhole,plume and spatters characteristic parameters are considered as inputs to calculate theoretical weld width. The proposed BP neural network has been successfully tested in a real time disk laser welding process.关键词：high-power disk laser welding;multi-feature parameters;welding status;synchronous detection
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发布时间：2023-03-29 - 摘要：The application of weathering steel sheet is the core technology to solve the lightweight of high speed heavy load truck. In order to solve the problems of large heat input,burn through and large deformation during the welding process of weathering steel sheet,the CMT welding method is used to optimize the welding parameters of 1.5 mm weathering steel sheet,and the optimal parameters are used to simulate and compare the deformation of CMT welding with that of traditional welding（MAG welding）for weathering steel. The results show that the properties of the full penetration joints are good,and increasing welding speed can reduce joint misalignment and improve the joint property,the tensile strength of joint peaks at 669.6 MPa;the simulation results show that the deformation trend of CMT welding is similar to that of MAG welding,the deformation of weld center and edge plate are large,the maximum CMT welding deformation is +3.8 mm,the maximum MAG welding deformation is +4.8 mm,the CMT welding deformation is obviously smaller than MAG welding deformation.关键词：weatherproof steel sheet;CMT welding;welding technology
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发布时间：2023-03-29 - 摘要：In order to study the effect of wire feed speed and welding speed on the forming of Q345E low-alloy steel narrow gap laser wire-bonding welding,the experiment were designed by changing the wire feeding speed and welding speed. According to the test results,the macro-metallurgical status of the welded joint at the welding speed and wire feed speed,the penetration depth and the weld width were analyzed. Through the analysis and comparison,the suitable wire feeding speed of Q345E narrow-gap laser wire-bonding backing welding were obtained,the welding speed was 5 m/min and the welding speed was 0.36 m/min.关键词：Q345E low alloy steel;narrow gap laser filler wire welding;penetration and melting width
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发布时间：2023-03-29 - 摘要：Dissimilar metals of 1060 aluminum and galvanized steel were joined with lap joint by pulsed double electrode gas metal arc welding-brazing with ER4043 aluminum filler metals. The welding joints of aluminum and steel were heat-treated at 270 ℃ and 350 ℃. The microstructure of the welded joint was observed by scanning electron microscopy,the diffusion and hardness distribution of alloying elements in different areas of the welded joint before and after heat treatment were tested by energy spectrometer and microhardness tester. The results show that the homogenization diffusion of alloy elements in welding joint occurs after heat treatment.After heat treatment at 350 ℃,a layer of Fe2Al5Zn0.4 intermetallic compound was formed in the weld toe area of the welding joint. The microhardness distribution of weld metal is uniform and the change of microhardness of weld toe area is smaller after heat treatment at 270 ℃,it is beneficial to avoid the stress concentration and improve the mechanical properties of the welding joint.关键词：aluminum-steel welding-brazing;intermetallic compounds;heat treatment;microhardness
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发布时间：2023-03-29 - 摘要：For the thick plate box K-joint component of Malaysian signature tower project,the welded joint form and welding groove sequence are optimized. Considering the local cushioning effect of welded joints,the first weld in each layer starts from the side of the flange. In order to control the welding heat input,a combined welding method of flux-cored wire gas shielded welding and submerged arc welding filling cover is adopted for the welds of main part. The welding sequences of the main weld and K joint are well-designed. Preheating, post-heat and interpass temperatures are strictly controlled to prevent lamellar tearing and guarantee the delivery quality of project components.关键词：box K-joint;lamellar tearing;joint form;layer sequence;welding sequence
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发布时间：2023-03-29 - 摘要：Pressure vessel of gasifier is usually made of ASME specification material SA-387GR11CL2 plate. Due to the specific requirements of working conditions and service performance, the medium temperature mechanical properties of the pressure vessel are generally specified. In a gasifier project of DBC,the tensile strength of material and welding joints SA-387GR11CL2 plate at 427 ℃ should be not less than 450 MPa. Whether the material and welding joints could meet the relevant technical requirements after series of welding and heat treatment is the main manufacturing difficulty of this product. The effect of welding process and heat treatment specification on the properties of SA-387GR11CL2 materials and welding joints was studied by series of welding and heat treatment process tests analyzed with larson-miller parameters,and the heat treatment process test of the head was especially carried out. Reasonable welding process and heat treatment specification of pressure vessel of gasifier reactor,quench room and head were worked out.关键词：gasifier;SA-387GR11CL2 plate;welding and heat treatment process;larson-miller parameters;performance effect
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发布时间：2023-03-29 - 摘要：Economizer tube leakage occurs after 34 days of use,and the leakage point is at the butt weld of the steel tube. In order to find out the leakage reasons,the base material composition test,microstructure observation and hardness test of the weld section are carried out,and the test results are compared with the specified requirements in the standard <GB 5310-2008 seamless steel tubes and pipes for high pressure boiler>,the material composition and hardness test results meet the requirements of relative standards. By observing the microstructure,it is found that the pores and internal cracks in weld fusion zone cause the decrease of the weld strength.In use process,the extension of internal cracks in work environment is the main reason for steel tube leakage at weld.关键词：microstructure;crack;vickers hardness
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发布时间：2023-03-29 - 摘要：The submerged arc surfacing with band-electrode technology is used to surfacing Inconel 625 on the 16 Mn tube sheet. And then the macroscopic testing, permeation testing,metallographic structure analysis,HV-hardness testing and corrosion resistance testing are used to test the quality of welded joints. By welding procedure qualification,suitable welding parameters are chose and formulated to ensure the welding quality to meet the requirements of design and use.关键词：inconel625;surfacing;SAW;tube sheet
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发布时间：2023-03-29 - 摘要：By using a C type induction heater with variable radius and three dimensional tooling car,an electromagnetic induction heating device which is suitable for the preheating of the inner wall surfacing of the nuclear pressurizer and the hydrogen baking is designed in this article. The C induction heater with adjustable radius can heat the large area in a certain range,and the tooling car can adjust the position of the C induction heater in the three-dimensional space. The device is featured by high automation and good heating effect,and is of high engineering application value.关键词：pressurizer cylinder;inner wall surfacing;induction heating;tooling design
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发布时间：2023-03-29 - 摘要：The principle of hydrodynamics is applied to the design of automatic welding cover for underwater pipeline repair by using FLUENT software. The structure and size of the drain cover are determined,and the MIG automatic welding experiment is carried out for underwater pipeline repair. Argon is used as protective gas and the pressure of the experimental environment is 0.15 MPa. The velocity and pressure cloud images obtained through the calculation and simulation of the FLUENT software can directly show the influence of different intake modes on the airflow stability in the gas phase space. The underwater MIG automatic welding experiment by this method shows that the drainage hood has good drainage effect,the arc combustion is stable and the underwater weld quality is good,which lays the foundation for the underwater welding equipment and technology research.关键词：drainage hood;automatic welding for underwater pipeline repair;FLUENT software
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发布时间：2023-03-29 - 摘要：Based on the analysis of the development of welding technology and characteristics of welding discipline,this paper points out that in the field of patent examination,books retrieval has an important meaning,and Duxiu Knowledge Search Database shows as one of the most important database,and is the necessary searching database in welding field,and combined with case analysis elaborated to point out Duxiu Knowledge Search Database is of importance in acquiring closest prior art,proofing common general knowledge,auxiliary reasoning,understanding and responding to comments stated by the applicant.关键词：welding;searching;Duxiu;patent examination
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发布时间：2023-03-29 - 摘要：During the structure construction of offshore engineering,there is a large number of welding and inspection work accompanied,as each weld joint is combination with an independent inspection report,there are many different kinds of welding inspection reports,and the format is not identical,thus it takes a lot time to manage the inspection reports. The low efficiency and high error rate bring great trouble to the construction management. A welding inspection report management system is developed,which SQL Server database and client/Server mode are used,and the system had been well applied in BZ34-9 etc. project. Many users online simultaneously, data sharing,intelligent query operation,intelligent error correction,automatic statistics etc. functions are realized in this system,so the accuracy and efficiency of the inspection report management is improved significantly,and a lot of time is saved for the subsequent work.关键词：offshore engineering;structural welding;inspection report;database;building block
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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
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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。联系电话:028-83267908联系人:黄秀艳E-mail:bj@toweld.com
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发布时间：2023-03-29 - 摘要：<正>书号:250售价:56.00元作者:（美）利波尔德//科特基,译者:陈剑虹。本书介绍了国际上不锈钢焊接冶金学及焊接性方面的进展。以不锈钢的成分和相组成图的开发和演变为基础,详细阐述了马氏体、铁素体、奥氏体、双相组织和析出硬化组织等五种不同显微组织的不锈钢合金系的焊接冶金和焊接性问题。有些章节还举出了实例研究,这就让读者看到
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发布时间：2023-03-29 - 摘要：<正>书号:0095定价:16元焊接操作中存在诸多危险因素和有害因素,可能发生触电、火灾、爆炸、灼烫和高处坠落等工伤事故,还可能患眼睛、皮肤、呼吸系统和血液等疾病。因此,焊接属于特种作业,电气焊工属于特殊工种,遵照国务院颁布的有关规定,焊工必须经过安全培训并考试合格,方准独立操作。并且在取得安全考核合格证之后,尚需定
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发布时间：2023-03-29 - 摘要：<正>好书推荐,欲购从速!书号:0232定价:41元本书主要讲述如何控制焊接变形。内容包括焊接变形的规律和梁、柱焊接弯曲变形的计算,焊接板结构箱形梁腹板预拱度计算,减小焊接变形的方法,焊接变形的机械矫正方法、火焰矫正的机理和火焰矫正的实际操作方法。本书适合于从事焊接结构设计制造的技术人员和焊接工艺人
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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: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,弧焊电源的基本特性,弧焊变压器、弧焊整流器、弧焊逆变器、数字控制弧焊电源的基本原理、结构、性能特点及其应用,以及弧焊电
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发布时间：2023-03-29
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