最新刊期
期 12 ， 2019
- 摘要：Due to the characteristics of light weight and high strength,2 A12-T42 aluminum alloy has been used as the main materials of aircraft. Refill friction stir spot welding（RFSSW）as a novel solid phase connection technology,was carried out to investigate the joint,the appearance and microstructure were analyzed by SM and metallographic microscope respectively,the corrosion behaviour of RFSSW joint was investigated by immersion test,static weight loss test and polarization curve test. The experiment results show that the RFSSW joint has a good forming and defect-free on the surface,the metal microstructure and precipitate phase of joint is differentiated in different districts,the grains of SAZ and PAZ are small as the direct stir with the tool,the metal microstructure and precipitate phase of TMAZ is distributed in a certain direction,for the affection of heat input in HAZ,the microstructure grain grew and the precipitate phase coarsed and aggregated. Immersion test shows that the corrosion resistance of 2 A12-T42 RFSSW joint is differentiated in different districts,the corrosion resistance of HAZ is the lowest,and the pitting corrosion is developed firstly,the corrosion resistance of SAZ is the highest. The corrosion resistance of RFSSW joint is lower than that of base metal. The polarization curve test shows that the sequence of the corrosion resistance in each district from high to low was SAZ,PAZ,BM,HAZ/TMAZ.关键词：2A12-T42 aluminum alloy;RFSSW;microstructure;corrosion behavior
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发布时间：2022-03-15 - 摘要：In order to solve the problems of the lack of effective management and reusability of ship welding procedure knowledge,a method based on ontology for ship welding procedure knowledge graph is proposed. Firstly,based on the ship welding procedure content,the ship welding procedure knowledge is condensed,the welding procedure knowledge ontology is established,and the semantic relationship extraction between entities and concepts is completed based on the third-order tensor triplet method. Secondly,the welding procedure knowledge graph is constructed according to the acquired entity and its semantic relationship,and a graph mechanism between ontology and knowledge graph is established;Finally,in order to avoid the repeated storage of the common attributes of the concept,the welding procedure knowledge is stored by considering the hierarchical table structure model. On this basis,the ship welding procedure knowledge management system is designed and developed,and the knowledge graph is used to realize the expression and semantic retrieval of the welding process knowledge,and the rationality of the ship welding procedure knowledge graph construction method is verified.关键词：welding procedure;knowledge graph;ontology;knowledge modeling;welding management
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发布时间：2022-03-15 -
Finite element analysis and process optimization of welding process for rail vehicle floor structure
摘要：In the aluminum alloy body of rail vehicle,the floor is a typical welded structure of aluminum alloy profiles. And after welding,it is prone to occur large residual stress and welding deformation,such as bulging and twisting,which increases the difficulty of assembly of various components,and reduces the bearing capacity of the floor. In this paper,a thermal-mechanical coupled finite element model based on the thermal-elastoplastic method is established and calculated to gain the postweld residual stresses and the distribution of welding deformations of floor structure. And the simulated residual stresses are compared with experimental results,which shows a good agreement. Finally,the simulations of different welding sequence of floor structure are compared and analyzed,and the welding scheme with the minimum welding deformation or residual stress is obtained,which provides a guidance for the welding practice.关键词：thermal-elastoplastic method;floor structure;stress and deformation;process optimization- 27
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发布时间：2022-03-15 - 摘要：The normal operation of bellows in GIS equipment is related to the safety and stability of the substations. The bellows and welds where occurs leakage in GIS equipment of a 750 kV substation are analyzed through macro-inspection,fracture analysis,micro-morphology analysis and chemical composition analysis. And the stress distribution of defective bellows was calculated by finite element method,and the failure reasons of bellows with leakage were analyzed. The results show that stress corrosion is the main reason of leakage and perforation of bellows. Meanwhile,the strength of the joint of bellows decreases due to welding defects,resulting in local crack of the weld and leakage. Therefore,in the production process of bellows,it is necessary to improve the welding procedure and strengthen the non-destructive testing of welding product quality,so as to prevent the introduction of pollutants and effectively avoid bellows failure.关键词：bellow;welding defects;failure;stress corrosion;finite element method
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发布时间：2022-03-15 - 摘要：The inner surface of core make-up tank（CMT）in nuclear island shall be overlaid with stainless steel for which the first layer is EQ309 L and the corrosion resistant layer is EQ308 L. According to the design requirements,the first layer of EQ309 L shall meet the ferrite content of 3～20 FN. However,it is found that no SAW parameters can meet the content. The treatment of the first layer ferrite which can not meet the design requirements and subsequent design suggestions according to engineering practice are given.关键词：AP1000;main equipment in nuclear island;stainless steel cladding;first layer;ferrite content
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发布时间：2022-03-15 - 摘要：<正>中国电器工业协会电焊机分会（以下简称"分会"）在中国电器工业协会（以下简称"中电协"）和分会理事会的领导下,在会员单位的支持下,顺利完成了本年度工作计划,积极配合中电协及各职能部门,按时完成中电协及各职能部门布置的各项工作。现对2019年度分会重点工作总结如下:
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发布时间：2022-03-15 - 摘要：<正>第8届东亚焊接技术论坛于2019年11月21～23日在韩国大邱市Inter-Burg EXCO会展中心召开。首届东亚焊接技术论坛于2011年召开,最初由中、日、焊三国焊接学会联合举办,每年召开一次,旨在为三国焊接与连接学者提供学术交流合作平台,促进东亚地区焊接与连接技术产业不断进步发展。自2017年起,东亚焊接技术论坛由中国、韩国焊接学会轮流承办,每两年举行一次。论坛向全亚洲国家开放,吸引
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发布时间：2022-03-15 - 摘要：<正>2019年12月4日,安川首钢机器人有限公司（下称"安川首钢"）与梅卡曼德（北京）机器人科技有限公司（下称"梅卡曼德机器人"）举行了战略合作签约仪式。安川首钢总经理前川昭一、副总经理曹利、总工程师曾孔庚、技术中心主任胡婷、工程部部长刘冰,技术部副部长李晓燕;梅卡曼德机器人CEO邵天兰,联合创始人付翱等人出席了签约仪式。
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发布时间：2022-03-15 - 摘要：<正>由四川省机械工程学会焊接专委会、四川省职工技协焊接专委会、西南交通大学主办的"四川省机械工程学会焊接专委会、四川省职工技术协会焊接专委会2019年度会议",于2019年11月22日在西南交通大学九里堤校区举行。会议得到了四川省机械工程学会、各市区焊接分会、科研院校及商界企业的大力支持。来自全省80余家单位、120余名代表参加了此次
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发布时间：2022-03-15 - 摘要：<正>ABB为专业领域及行业推出了一系列机器人、控制器和端到端解决方案。扩展包括严苛环境版的紧凑型IRB 1100机器人和OmniCoreTMC90XT机器人控制器。RobotStudio?软件新增了3D打印功能,使用户能够在30分钟内为ABB机器人进行编程,实现增材制造。2019年12月18～21日,ABB机器人在东京举行的iREX国际机器人展上,展示其最新的数字产品、解决方案和服务,同时继续拓展其产品组合,使自动化能够应用于更广泛的行业和工作环境。
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发布时间：2022-03-15 - 摘要：<正>2019年12月7日,2019全国机器人焊接技能大赛总结会在上海库茂机器人公司召开。参加会议的有:卢振洋、吴九澎、李宪政、戴建树、李桓、朱志明、杨春利、李国庆、周勇、王国安、江云生、曲杰、姜泽东、俞俊承、陆友添、李波、肖珺、宋金玲、李靖、赵建忠、李千林。本次会议由中国焊接协会吴九澎副秘书长主持,吴秘书长首先对今年赛事承办单位常州工程职业技术学院和上海库
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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：For narrow gap welding,precise weld deviation information is needed to ensure the problem of welding gun alignment.A magnetic tracking arc-laser sensor combined weld seam tracking system is designed.The front laser vision sensor scans the weld center and adopts the shape.The extraction algorithm and the correlation filter based on Kernel algorithm can obtain the coordinates of the weld feature points.The Lagrange interpolation method is used to fit the approximate curve of the weld trajectory.The threshold threshold is set in two cases.The adaptive weighted fusion method performs information fusion,which makes the acquired weld deviation information more accurate,and finally ensures the centering of the welding torch and the good sidewall fusion.关键词：narrow gap MAG welding;magnetron arc laser sensor;weld trajectory prediction;adaptive weighted fusion method
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发布时间：2022-03-15 - 摘要：In order to solve the difficult problem of an intersection-line Underlining of two pipe crossing in the engineering field,A device of realize the synchronous underlining function of branch pipeline intersection-line and main pipeline intersection hole is developed. Specifically,it is a device to realize the function of fast and synchronous marking of branch pipe intersecting line and main pipe intersecting hole by manual operation and using profiling principle. The device has the characteristics of high accuracy of underlining,easy operation,low manufacturing cost,strong universality and reusable. It is suitable for marking intersecting lines and intersecting holes of small and medium-sized intersecting pipelines before welding in the field of production,small batch and field construction. At the same time,It also provides a new way of thinking for the research of pipe intersection synchronization underlining,low-cost automatic cutting and welding,which has certain practical reference value.关键词：crossover pipes;intersecting line;synchronous underlining
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发布时间：2022-03-15 - 摘要：The construction of jointless track and rail repair need a higher efficiency and better quality solution. At present,flash butt welding,gas pressure welding,thermite welding and arc welding are the main solutions,but there are some limitations in the use environment and joint quality. This paper introduces the application of the automatic welding system of narrow gap gas protection in rail welding,and verifies the feasibility of the welding method of narrow gap gas protection in the early stage. The automatic welding system of narrow gap gas protection is composed of the small robot of FANUC company and the welding power supply of Shandong Aotai company. It is welded with the welding method in a specific swing way,the welding seam is well formed,and the internal fusion is in good condition. However,due to the short test rails,the rails deformed severely during welding,and certain anti-deformation measures have been taken. This method has great application prospect and should be further studied and popularized.关键词：rail;welding;narrow gap;automation
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发布时间：2022-03-15 - 摘要：The welding technology and equipment of MIG/MAG and TIG,which are widely applied,have been modified with high efficiency by composite/hybrid welding. It is beneficial to realize high quality and high efficiency welding with low cost,high quality,high depositing rate and high welding speed,and is of great significance to improve the manufacturing efficiency of welding technology. In recent years,MIG/MAG,TIG and other arc welding technologies and equipment with high efficiency have been introduced at home and abroad. In this paper,the principle and application of high efficiency welding technology of double arc pool,such as double wire MIG/MAG welding,double MIG/MAG double-sided welding,double TIG composite welding and TIG-MIG composite welding are summarized. Finally,the new technology of MAG-TIG double arc heat source composite high-efficiency root welding is introduced emphatically.关键词：high efficient welding;double MIG welding;double TIG welding;TIG-MIG hybrid welding;MAG-TIG hybrid welding
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发布时间：2022-03-15 - 摘要：In the manufacturing process of TIG welding augmented material,the reciprocating heating of arc not only changes the forming quality,microstructure and properties of augmented material components,but also has a great influence on the radiation intensity and temperature of arc plasma. In this paper,316 L stainless steel welding wire with a diameter of 1.0 mm was deposited in a single channel and multi-layer to study the arc physical characteristics of augmented 316 L stainless steel TIG welding. According to the characteristics of arc augmentation forming system,an optical acquisition test system for TIG welding augmentation arc was established to obtain the spectral information and arc image of augmentation arc. The arc temperatures of different layers were calculated by relative strength method. The unstable phenomena of the first four layers were analyzed. The influence of the number of additional layers on arc shape and arc temperature was obtained. It is helpful to understand the mechanism of TIG welding arc influence on augmentation forming and lay a foundation for the realization of automatic quality control in arc augmentation manufacturing process.关键词：TIG additive manufacturing;arc physics;stainless steel
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发布时间：2022-03-15 - 摘要：A certain type of aircraft is inspected during use,it is found that exhaust valve motor fixed bearing has suspected crack. After the cleaning,the dye penetrant inspection finds penetrative cracks. The bearing material grade is АЛ34（domestically produced grade is ZL116）,the heat treatment requirement is σb≥294 MPa,and the surface treatment requirements are anodizing sulfuric acid and dichromate filling/priming. The bearing is above the engine compartment and is subject to relatively large vibrations. Through the observation of the fault bearing appearance,stereo inspection,microscopic observation,energy spectrum analysis,metallographic examination,hardness test and other tests,it is concluded that the bearing has fatigue crack,and the main cause of fatigue is stress concentration. Due to the existence of welding defects,the cracks expand rapidly,which is the direct cause of the formation of fatigue cracks.According to the analysis results,a effective method is given to improve the fatigue resistance of the bearing parts and avoid the recurrence of faults. And prevention advice is also put forward.关键词：fatigue;welding;tensile stress;pore;lack of fusion
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发布时间：2022-03-15 - 摘要：The CMT seam welding parameters of Q345 NQR2 weathering steel sheet are optimized by three-level five-factor interactive orthogonal experiments. Ten typical positions of 18 groups of experiments were scanned by a three-dimensional scanner,and the optimal welding parameters were obtained by deformation analysis. The effects of welding factors and interaction effects on deformation were analyzed by visual range and variance analysis method. The result shows that the welding gap and the interaction between wire feed rate and welding speed are the key factors affecting CMT seam welding deformation of Q345 NQR2 weathering steel sheets. The welding deformation of Q345 NQR2 weathering steel sheets can be effectively controlled by adjusting wire feed rate,welding speed and welding gap.关键词：CMT seam welding;deformation control;laser measurement;Q345 steel sheet
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发布时间：2022-03-15 - 摘要：In order to optimize the friction welding parameters of X100 pipeline steel, the tensile strength and hardness of the friction welded joint are taken as the evaluation indexes,through the orthogonal test,the influence of the welding parameters such as the friction speed,friction pressure,upsetting pressure and axial shortening on the performance of the welded joint are studied,and the welding parameters for high quality welded joints are obtained. The results show that The influence of each welding parameter on the performance of the X100 friction welded joint in descending order is:friction pressure,friction speed,upsetting pressure and axial shortening. Taking the strength and hardness of the joint as the index,the optimum welding parameters is: friction speed of 1 000 r/min,friction pressure of 170 MPa,upset pressure of 255 MPa,axial shortening of 7 mm. Through the verification test of the optimal welding parameters,the tensile properties obtained exceed the tensile test results before optimization,and the consistency between the test results and the range analysis results is verified.关键词：high grade pipeline steel;friction welding;welding parameters;performance
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发布时间：2022-03-15 - 摘要：Contact reaction brazing of silver and 07 Cr16 Ni6 high-strength stainless steel with Cu as the interlayer was carried out in this paper,and the properties and microstructure of brazing joints were tested and analyzed. The results show that,with the increase of interlayer thickness,the diffusion depth of Cu to the silver matrix increases,and the strength of brazed joint first increases and then decreases. When the thickness of the intermediate layer is 20～30 μm,the silver is reliably connected to the high-strength stainless steel,with full brazing angles,tight joints,and the shear strength is up to 131 MPa.关键词：silver;high-strength stainless steel;contact reaction brazing;interlayer
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发布时间：2022-03-15 - 摘要：At present,the replacement and maintenance of CRDM in in-service unit of PWR nuclear power plant in China,is mainly monopolized by AREVA,and no company has the capability to replace CRDM in in-service unit of PWR nuclear power plant.Therefore,the development of a complete progress of in-service unit replacement for CRDM is of great significance. This paper mainly introduces the automatic welding operation essentials and technical parameters of the lower sealing welds involved in the replacement of the CRDM in the PWR reactor unit in service. According to the process of stand-by test,the proper operation parameters are given,which can provide the reference for the following replacement of the CRDM in the PWR reactor unit in service.关键词：CRDM;in-service unit;replacement;automatic welding
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发布时间：2022-03-15 - 摘要：The effects of different cryogenic treatments on the microstructure and properties of dissimilar repair welding joint of WE43 A magnesium alloy by TIG welding are studied. The results show that comparing with the as-welded,as the deep cryogenic time extends,after the deep cryogenic treatment,the grains of the dissimilar welded joints of WE43 A magnesium alloy are gradually refined and the second phase precipitates from the matrix and the grain boundary,and the microhardness of WE43 A magnesium alloy TIG welding repair joint increases,its corrosion resistance improves,the grain refinement rate can reach 54.4%,and the microhardness of weld metal zone increases by 25.3%. In general,the-100 ℃× 8 h deep cryogenic process is the best.关键词：WE43A magnesium alloy;repair welding;deep cryogenic treatment
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发布时间：2022-03-15 - 摘要：The robot MAG welding method is used for flat welding test,and the influence of the important welding parameters on the appearance of weld in the rapid metal forming process of robot MAG welding is studied. By single factor test method,the influence of welding current,welding voltage,welding speed and wire extension on the appearance of weld are tested respectively,and the influence rules of different welding parameters on weld geometry dimension（weld width,reinforcement and penetration） are obtained. The experimental results show that welding current,welding voltage and welding speed have significant influence on the weld geometric dimension,while wire extension has little influence on the weld geometric dimension. The weld geometric dimension can be adjusted slightly by changing the welding parameters.关键词：robot MAG welding;welding parameters;appearance of weld
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发布时间：2022-03-15 - 摘要：The microstructure and impact properties of Q345 E low alloy steel in the superheated zone under different welding heat input were studied by welding thermal simulation technology. The results indicate that with the increase of welding heat input,the microstructure of the superheated zone is gradually transformed from pro-eutectoid ferrite+pearlite and part of martensite into granular bainite and acicular ferrite structure. When the welding heat input is 3.06 kJ/mm,a small amount of Wei’s tissue appears,with the lowest impact energy. As the weld heat input increases,the average hardness value of the coarse grain zone gradually decreases. When the welding heat input is 1.35 J/mm,there is a small amount of lath martensite in the microstructure,and the hardness is the largest. When the welding heat input reaches 2.68 kJ/mm,acicular ferrite appears in the microstructure at this time,and the hardness decreases more obviously. The overall impact energy is gradually decreasing. When the welding heat input is 2.68 kJ/mm,the microstructure was acicular ferrite and the impact energy is the largest.关键词：Q345E low alloy steel;welding heat input;coarse grain zone;microstructure;impact performance
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发布时间：2022-03-15 - 摘要：The welding quality of bogie products is pretty high,and the welding defect exceeding the standard,especially crack,is not allowed in any welding quality grade. Some crack develops immediately after welding, others comes out after a period of time after welding. Therefore,effective method should be taken to inhibit the generation of crack when formulating the welding process of the bogie welding parts,and preheating is the most effective way to prevent cold cracks. This paper takes a typical welded joint of bogie frame as an example and introduces how to determine the preheating temperature.关键词：bogie welding;cold crack;preheating temperature
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发布时间：2022-03-15 - 摘要：ZG15 Cr2 Mo1 is the common material used for large castings in thermal power plants. The welding repair technology of ZG15 Cr2 Mo1 main steam combined regulating valve in the thermal power plant is introduced,including the removal of defects,welding preparation,heat treatment procedure,welding technology and inspection. The main steam combined regulating valve is repaired by manual metal arc welding with ENi Cr Fe-2 electrode,single U groove and preheating temperature of 100 ℃～150 ℃. To get a good result,the manual metal arc welding with low current is used for the backing weld,and the multi-layer and multi-pass welding is also used for continuous welding. After welding,the penetration test and hardness test are carried out,no effect is found,and the hardness test results also meet the standard requirements,the results show that the technology can repair the large castings of ZG15 Cr2 Mo1 in thermal power plants.关键词：thermal power plant;main steam combined regulating valve;crack;repair
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发布时间：2022-03-15 - 摘要：In this paper,a large four-roller plate bending machine is used to roll a batch of shells with same material different sizes and same size different materials for two groups of research objects. Data of the thick-shell rolling length variation in the rolling process are collected and analyzed. It is concluded that the plasticity of materials and the shell sizes are the main reasons for the rolling length variation. For the different materials,better plasticity means easier roll long,more deviation and greater impact on the shell forming accuracy. For the same material,larger thickness and smaller diameter mean greater pressure on the shell in the rolling process,more plastic deformation and greater impact on the shell forming accuracy. Through this experimental study,we summarize the experience for optimizing the rolling process,controlling the change of rolling length,and improving the thick-shell forming accuracy.关键词：plate welding pressure vessel;thick-shell;rolling forming;rolling length;forming accuracy
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发布时间：2022-03-15 - 摘要：A certain transformer support is made of Q235 B steel tube. In order to achieve the requirements of preventing eddy current phenomenon and special performance,it is necessary to use red copper for filling and welding. The welding of steel and copper is difficult,welded joint is prone to hot crack and porosity defect. By analyzing their weldabilities and welding process problems,it is decided to adopt the manual tungsten argon arc welding（GTAW）. By making a reasonable welding procedure,including the controls of welding materials control,welding procedure measures,welding parameters,welding operations,the welded joint obtained meets the requirements of quality and design.关键词：structural support;GTAW;welding procedure
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发布时间：2022-03-15 - 摘要：One side welding both sides forming technology of butt welding in the overhead position with shielded metal arc welding（SMAW） is summarized. The preparation before welding,selection of electrode,the operating points during the welding of backing layer,filling layer and covering layer are also introduced in detail, so as to control the appearance of weld,improve the welding quality,and provide reference for the follow-up production work and the training of backup technical personnel.关键词：SMAW;butt welding in the overhead position;one side welding both sides forming
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发布时间：2022-03-15 - 摘要：Inspired by the era background of "mass entrepreneurship,mass innovation" and the current thought of "new subject" talent training,the teaching content,teaching methods and teaching evaluation system of virtual simulation welding experiment are emphatically constructed,and a welding virtual simulation platform with "complete system,rigorous science,vivid image,educational and fun,virtual and real,open sharing" is established,and a new model of student-centered,results-oriented education and multi-disciplinary cross-personalization is formed,the establishment of new subject paradigm is gradually explored,and the training objectives of diversified and innovative outstanding engineering talents are achieved under the new situation.关键词：new engineering;virtual simulation;welding experiment
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发布时间：2022-03-15 - 摘要：<正>专题活动一:石油、天然气管道工程先进焊接技术对应活动:2020’长输管道焊接技术研讨会关注重点:长输管道焊接技术现状及发展方向,长输管道焊缝设计、工艺及强度匹配原则及实践,管道自动化焊接数字电源、管道全位置自动焊接装备及工艺,管道焊接质量在线监测方法及分析,长输管道焊接材料发展及国产化,长输管道无损检测技术与设备,小口径管道全自动焊接设备及工艺,复合管道焊接性分析及焊接工艺方法,海洋管道铺设中的焊接装备及工艺,管道激光一电弧复合焊
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发布时间：2022-03-15 - 摘要：<正>2019年11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）。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：2022-03-15 - 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：2022-03-15 - 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：2022-03-15 - 摘要：<正>书号:0111定价:26元为配合技师评聘工作的开展,满足机械行业对工人技师培训和考评的需要,加快技师培训教材建设,我们经过到上海、江苏、四川等地进行广泛的调研,并结合《通知》精神,确立了教材编写的总体思路;组织了一批由工程技术人员、教师、技师、高级技师组成的编写队伍,编写了这套《机械工业技师考评培训教材》。全套
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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。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：2022-03-15 - 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：2022-03-15 - 摘要：<正>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：2022-03-15 - 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：2022-03-15 -
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