最新刊期
期 9 ， 2021
- 摘要：Under different operating conditions, the welding current and arc voltage output waveforms are required because the welding process requires different metal transfer modes. At the same time, the welding process affected by many factors to produce random, occasional information is also reflected in the welding current or voltage waveform data composition, so that the data information structure derived from various influencing factors in GMAW process is superimposed by a number of different natures of probability density functions. In the past, the expression of arc welding parameters was generally premised on the law of large numbers, and the statistical value of the data was calculated according to the general assumption of normal or approximate normal. However, this statistical hypothesis and its calculation method, the data information processing under GMAW conditions is only partially feasible, for the arc welding information based on wave control or pulse current mode is no longer valid in most operating conditions, not only will lead to parameter mean, heat input and other physical errors, but also make the arc welding process occasional outlier data and its hidden key information may not be known. On the analysis of the current and arc voltage data of GMAW processes, this paper explains the reasons for the different data distribution properties of the welding process, and puts forward the way to reconstruct the expression of welding parameters and improves the scientific and effectiveness of data statistics analysis in the current development of welding to automation and informationization, so as to prevent and avoid misreading and misleading the information understanding and application of arc welding process.
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发布时间：2022-10-28 - 摘要：In order to meet the performance requirements of new direct connected electrolytic copper permanent cathode plate, the morphology, microstructure, tensile strength, conductivity and electrochemical corrosion resistance of Cu/3116 L dissimilar metal welded joint obtained by laser welding and argon tungsten arc welding were compared and analyzed by optical microscope, scanning electron microscope, energy disperse spectroscopy, electronic tensile testing machine, metal conductivity meter and electrochemical workstation. The results show that there is little difference in average tensile strength of the welded joints obtained by these two welding processes, and the conductivity and corrosion resistance of laser welded joints are better than those of TIG welded joints. Therefore, the direct connected electrolytic copper permanent cathode plate made by the laser welding has better overall performance.
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发布时间：2022-10-28 - 摘要：The stress rupture strength is of great significance to evaluate the service life of the C-HRA-5 welded joint under complex working conditions. A mathematical model was established to predict the stress rupture strength based on the LarsonMiller（L-M） parameter formula through the high-temperature short-time tensile test at different temperatures, and the stress rupture strength of 100 000 hours was extrapolated. The results show that the welded joint of C-HRA-5 steel represents the best strength and plasticity at 650 ℃ at all service temperatures, and presents typical micropore aggregation fracture at 700 ℃. With the increase of temperature, the second phase precipitates in-crease, the dislocation pile-up increases, and the mechanical properties of the welded joint decrease. Based on L-M parameters and the characteristics of state function and total differential, a mathematical model is established to predict the stress rupture strength of C-HRA-5 steel welded joints. The extrapolated fitting formula is lgσ =2.760 18-0.131 51 lgτ at 700 ℃ and the lasting strength of 100 000 hours is σ105973=116.020 3 MPa, higher than ASME SA-213 standard.关键词：C-HRA-5 steel;stress rupture strength;Larson-Miller;dislocation pile-up
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发布时间：2022-10-28 - 摘要：In order to improve the pitting corrosion resis tance of steel, a surfacing layer of Mn-N duplex stainless steel was prepared on Q235 steel plate by plasma build-up welding.The horizontal microscope was used to observe the microstructures of the solution-treated surfacing layer, and the distribution of each alloy element was analyzed by scanning electron microscope equipped with EDS. The pitting corrosion resistance of Mn-N duplex stainless steel plasma surfacing layer after treated at different solution temperatures was measured by ferric chloride immersion experiment and Electrochemical Impedance Spectroscopy（EIS）. The results show that, with the increase of the solution temperature, the pitting corrosion resistance of ferrite decreases, while the pitting corrosion resistance of ferrite austenite increases and the pitting corrosion resistance of the surfacing layer shows a trend of increasing in advance and then decreasing.After treated at 1 230 ℃, the surfacing layer has the lowest pitting corrosion rate of 0.017 6 g/h. EIS test shows that the surfacing layer after solution treatment at 1 230 ℃ has the highest resistance to pitting corrosion. The alloy elements redistributed in the two phases during the solution treatment may be the dominant factor for the differences in the pitting corrosion resistance of the surfacing layer after treated at different solution temperatures.关键词：solution treatment;Mn-N duplex stainless steel;plasma build-up welding;pitting corrosion resistance
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发布时间：2022-10-28 - 摘要：As a new degradable biological material,magnesium alloy has important application value in the field of the fourth generation of vascular stent implantation products,but its application and promotion are restricted due to the difficulty in the processing of micro-tubes. A new method of electro-explosive spray deposition of magnesium alloy micro tube is proposed and the process is studied. The results show that when the wire diameter is 0.5 mm, the initial voltage is 14 k V, and the deposition distance is 25 mm, the uniformity,compactness and integrity of the deposition layer are good, and the nanocrystalline structure is obtained. The magnesium alloy micro tube with an outer diameter of 3.5 mm and a wall thickness of 0.12 mm are prepared, which meet the size requirements of the magnesium alloy vascular stent.关键词：spray deposition;magnesium alloy micro tube;nanocrystalline structure;biomaterials
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发布时间：2022-10-28 - 摘要：Automatic location and defect identification of weld defects for large-scale components are the necessary condition to realize the automatic operations of weld grinding and repairing. Due to the characteristics of large-scale component weld and weld defect images, such as shape diversity and random gray distribution, the difficulty of image processing is increased. A method of weld location and defect recognition based on deep learning was proposed. The weld position was determined and the weld bead and unqualified defects were identified through the deep learning target detection method. The gas pore and pit defects were identified by the deep learning semantic segmentation method. The weld location and defect identification models were created and trained based on the FPN network structure, and the model optimization was completed by increasing the number of samples. The accuracy rate of weld location is 95%, the identification accuracy rate of weld bead is 98%, and the identification accuracy rate of gas pore and pit is about 91.8%.关键词：weld location;defect identification;deep learning method
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发布时间：2022-10-28 - 摘要：The tunnel defects were prepared through process tests on 6005A-T6 hollow aluminum profiles, and metallographic,hardness and tensile tests were carried out. After stretching, the fracture was scanned to study the effects of different size defects on the mechanical properties and microstructure of 6005A-T6 hollow aluminum profiles. The test results show that the tensile strength of the joint is negatively correlated with the tunnel size in the thickness direction. The SEM scan results show that there are a large number of equiaxed dimples at the center and edge of the tensile fracture, all of which are ductile fractures; the tunnel defects are all located in the lower part of the weld nugget on the forward side, the weld nugget zone and the vicinity of the tunnel are subjected to strong mechanical stirring, and a dynamic recrystallization process occurs, all of which are fine equiaxed crystals. The microstructure of the heat-affected zone is not much different from that of the base metal, and the grains in these two zones are elongated in the rolling direction of the profile; there are softening zones on the forward and backward sides, and due to heat-mechanical action, the minimum hardness value of the backward side is 63.6 HV, the minimum hardness value of the forward side is 84 HV.关键词：friction stir welding;6005A aluminum alloy;tunnel;microstructure and mechanical properties
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发布时间：2022-10-28 - 摘要：A continuous feeding flux strips constrained arc ultra-narrow gap welding method was developed. The process test was carried out by changing the thickness of flux sheet and the feeding speed of flux strip, and the heating characteristics of the arc under various parameters were analyzed. The results show that increasing the thickness of flux sheet and the feeding speed of flux strips can enhance the restraint effect on the arc,increase the melting width of the weld root and reduce the melting height of the side wall; Increasing the melting coefficient of the flux sheet will increase the constrained height of the fixed wall of the melted flux sheet, and the height of the arc burning on the side wall will decrease, so that the arc energy density increases, which is more conducive to the arc heating the root of the side wall. When the melting coefficient of the flux sheet is less than 0.31, the constrained height of the fixed wall of the melted flux sheet is smaller, and the heating effect of the arc on the side wall enhances.关键词：ultra-narrow gap welding;feeding flux strips;heating characteristics;fixed wall constrained height
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发布时间：2022-10-28 - 摘要：The anti debris plate of AISI 660 is an important core functional part of HPR1000 nuclear fuel assembly, which is used to filter the debris in the fluid to prevent the abrasion and damage of the nuclear fuel cladding. There are nearly 2 000 square or circular holes on the anti debris plate with the overall dimension of about 220 mm square sheet. The size accuracy and position of the holes are very high, so it is difficult to process. In this project, the laser cutting process and its key characteristics are studied from the aspects of laser cutting pretreatment, cutting process, key process parameters, and post-processing. Finally, the laser cutting anti debris plate samples and supporting manufacturing process are successfully trial produced. This research provides a new research idea and direction for solving the technical problems in domestic nuclear fuel manufacturing.关键词：AISI 660;anti debris plate;nuclear fuel;laser cutting;process parameters;pre and post treatment
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发布时间：2022-10-28 - 摘要：The butt welding tests of Q345E thin plate with thickness of 3 mm were carried out by using high frequency pulse MAG backing welding mode and arc cold welding mode respectively. The small deformation process and mechanical properties of butt welding joint were studied, the metallo-graphic test was carried out, the causes of welding defects were analyzed, and the laws of welding residual stress and welding deformation were summarized. The results show that high frequency pulse MAG welding is suitable for small deformation butt welding of Q345E steel plate with 3 mm gap. When assembling "0" gap, the process package of backing welding mode is selected; when assembling 1 mm gap, the process package of arc cold welding mode is selected.关键词：Q345E thin plate;high frequency pulse MAG welding;welding residual stress;welding deformation;mechanical properties of joint
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发布时间：2022-10-28 - 摘要：Single layer surfacing test was carried out with high speed electro-slag welding material under the gradient current of 1 200 A, 1 500 A and 1 800 A, the effect of current on chemical composition and FN of surfacing layer was studied, and the microstructure of surfacing layer was analyzed.The single layer electro-slag surfacing material has good weldability under different currents and automatic deslagging after welding, surfacing layer has good flatness and straightness. The results show that the chemical composition,ferrite, hardness, side bending, intergranular corrosion and hydrogen-induced disbonding under different currents meet the requirements of technical conditions. Under the condition of the same surfacing thickness, with the increase of current and speed, the penetration and dilution rate increase, the contents of Cr and Ni of the surfacing layer decreases, and the ferrite content reduces. In engineering application, the ferrite content of the surfacing layer can be controlled by adjusting the welding parameters. The metallographic analysis results show that the microstructure of surfacing layer is austenite +little δ ferrite, after heat treatment, a C migration band about 10 ～20 μm width appears on the fusion line, which is mainly caused by the large carbon content difference between the surfacing layer of ultra-low carbon stainless steel and the medium carbon base metal.关键词：high speed electro-slag surfacing;single layer;dilution rate;ferrite;weld material
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发布时间：2022-10-28 - 摘要：In this experiment, the 3D printing technology of plasma powder was used to print the Stellite barrel type parts by robot 3D printing. After the experiment, the hardness and anatomy of the printed parts were analyzed. The experimental results show that the structure with dense structure and uniform macro hardness can be obtained by this method. After that, metallographic microscope, scanning electron microscope and high temperature hardness tester were used to test and analyze the samples. The results show that the microstructure of the samples is mainly dendrite, and there are obvious fusion zones between layers. The composition is uniform without obvious segregation. The high temperature hardness distribution accords with the change trend of high temperature hardness of stellite alloy, and the high hardness can be maintained at 700 ℃. The water erosion experiment shows that the printing part has better water corrosion resistance than the part obtained by conventional quenching process. The comprehensive experimental results show that the plasma printing technology of Stellite powder can form reliable components and has great potential for production.关键词：PTA;3D printing;Stellite powder
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发布时间：2022-10-28 - 摘要：Based on COMSOL Multiphysics finite element simulation software, a numerical model for ultrasonic monitoring of double pulse resistance spot welding（RSW） is established,and the transient distribution of the ultrasonic field inside the workpiece during the spot welding process is studied. The built-in ultrasonic probe electrode is designed, and the ultrasonic online monitoring experiment during the RSW is carried out. The A-type and M-type ultrasonic echo diagrams characteristics are analyzed, the M-type echo diagram characteristic of typical RSW defects is studied, and a new method for identifying the fake welding based on the M-type echo diagram is proposed. The research results show that the RSW M-type diagram based on ultrasonic signal can reflect the welding process, and the fake welding spot can be quickly identified through the M-type diagram characteristic.关键词：double pulse resistance spot welding;ultrasonic real-time signal;numerical simulation;fake welding
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发布时间：2022-10-28 - 摘要：In this paper, how to measure the softening zone of high strength and wear-resistant rail joint conveniently and accurately in construction site is discussed, in order to meet the requirements of the TB/T1632 "Rail Welding" standard, the test method of using the Leeb hardness tester to refine the measuring point spacing is studied. And the hardness of 60N U76CrRE rail gas pressure welding joint is tested. The results show that the average hardness of the softening zone on the top surface of the joint rail is 15 HB（5%） lower than that of the standard testing method; The average hardness of the joint decreases by 18 HB（5%）, and the width of the softening zone widens 0.5～1.2 mm（4% ～ 9%）; The average hardness of the joint softening area on vertical section decreases by 1.1 HRC（3%）, the average hardness of the joint decreases by 1.3 HRC（3%）, and the softening zone broadens 1～1.5 mm（7%～10%）.The measuring point spacing method is more accurate and convenient than the standard method.关键词：steel rail;welding;softening zone;hardness;measuring method
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发布时间：2022-10-28 - 摘要：According to the contract requirements, our company implemented AWS D17.2/D17.2 M:2013 resistance spot welding standard in an export project, which is the American aerospace resistance spot welding standard, which is quite different from the EN15085 railway vehicle welding standard currently implemented by our company. This paper describes the AWS D17.2/D17.2 M: 2013 spot welding standard from the aspects of the resistance spot welding procedure qualification test, welding machine qualification, spot weld quality evaluation and periodic inspection, and compares it with the railway vehicle industry general EN15085 standard and Japan standard JIS E 4048. Identifies the requirements of AWS D17.2/D17.2 M: 2013 resistance spot welding standards, which provide technical guarantee for the implementation of the project.关键词：railway vehicle;resistance spot welding;spot welding standard;qualification of welding machine;acceptance criteria
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发布时间：2022-10-28 - 摘要：In this paper, a new heating control method of rail AC flash welding based on current feedback is realized by fixing PLC scanning period and servo solenoid valve. The moving end clamp of welding machine head is superimposed with a variable speed feed motion on the basis of fixed vibration, so as to realize the rapid and high-quality heating of the rail end surface. The temperature field of the original pulse heating process is collected by infrared thermal imager and compared with that the new heating process before the end of high voltage stage. The results show that under the same heating time, the width of the high temperature zone of the new heating control method increases by more than 13.82% compared with the original pulse flash welding. Combining with the welding curve, it can be seen that the new heating control method increases the thermal efficiency by increasing the minimum current and reducing the circuit breakage, which can quickly establish the width of the temperature field at high temperature.关键词：rail AC flash welding;welding temperature field;heating control
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发布时间：2022-10-28 - 摘要：In order to better meet the requirements of rails with high wear resistance on heavy haul railways such as Daqin and Shuohuang, Panzhihua Iron and Steel Group has developed 1330 MPa high-wear-resistant U95Cr hypereutectoid rails.Reliable, stable and efficient welding technology is urgently needed in site rail welding construction. In this paper,experimental studies on welding and normalizing process of 75N U95Cr rails were carried out by the GPW-1200 digital control gas pressure welding machine. The results show that the hardness of U95Cr welded joints with this set of process parameters（The first stage: Acetylene/oxygen 111/107 SLM, welding heating for 270 s; the second stage: Acetylene/oxygen 92/87 SLM, welding heating for 90 s） meets the requirements of "Technical Conditions for Gas Pressure Welding of High-Wear-Resistance, High-Strength-Toughness Hypereutectoid Rails for Trial Laying Tests",and the drop weight, static bending, fatigue, tensile, impact,metallographic and grain size meet the requirements of TB/T1632.4 "Gas Pressure Welding". The performance of the gas pressure welding joints is stable and reliable, which is equivalent to the performance of the flash welding joints.关键词：U95Cr hypereutectoid rail;gas pressure welding;normaliziong process test;mechanical property
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发布时间：2022-10-28 - 摘要：This paper mainly introduces the new mode of training high skilled welding talents, that is, relying on the way of skill master studio established by vocational colleges to train international qualified welders, implementing the combination of vocational colleges +studio +production enterprise +qualification certification agency, exploring and practicing in the aspects of training mode, resource integration, system application, etc.,so as to meet the needs of continuous development of technology for talents.关键词：vocational college;skilled master studio;high skilled personnel;international welder
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发布时间：2022-10-28 - 摘要：This paper focuses on the engineering practice teaching mode based on the welding manufacturing of turbojet engine combustion chamber. Based on the theory of combustion chamber design, material selection, parts forming, welding and post-processing, the basic forming and manufacturing methods such as stamping, welding, cutting and heat treatment are known through hands-on practice. Practical projects focus on integrating theory with practice, emphasizing the process of knowledge acquisition, comprehensive application of knowledge and innovative ability, and deepening students’ systematic cognition of the manufacturing process of general welding products. Through team cooperation labor practice, cultivate engineering literacy（including labor literacy）, engineering practice ability and innovative spirit. At the same time, by making jet engines by themselves, students are encouraged and guided to have enthusiasm for aviation, so as to improve the effect of practical teaching.关键词：combustion chamber;practical teaching;welding processing;engineering ability
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发布时间：2022-10-28 - 摘要：This paper takes the welding training course carried out by the Engineering Training Center of Xi’an Polytechnic University as the research object, and takes the training of students’ engineering practice and innovation abilities as the base point. In the engineering training practice teaching, different modules of welding training are carried out for students of different majors. The teaching contents, teaching methods and practical operating methods are innovated to increase the students’ interest in learning, the comprehensive engineering ability of students and the instruction of teachers have been greatly improved, and the welding practice teaching effect of engineering training is good.关键词：welding training;engineering practice;innovation ability
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发布时间：2022-10-28 - 摘要：Taking welding technology and automation of Shaanxi Railway Institute as an example, in view of the implementation of "1 +X" certificate of the major pilot system,through the research on manufacturing industry enterprises and social evaluation organizations, the direction of the talent training mode reform of the welding technology and automation has been clarified. Around the "1 + X" pilot work, the talent training mode reform, class certificate accommodation, and teaching material construction has been discussed. The new personnel training mode has been constructed.关键词：welding technology and automation;1+X certificate system;cultivation of talents
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发布时间：2022-10-28 - 摘要：<正>2020年12月,经过多项学术指标综合评定及同行专家评议推荐,《电焊机》杂志被中国科学技术信息研究所收录为"中国科技核心期刊"（中国科技论文统计源期刊）。《电焊机》杂志多年来一直被收录为"中国科技核心期刊",在此感谢行业专家、学者、广大读者、作者长期以来的关注与支持,《电焊机》杂志将继续努力,进一步提高出版质量和办刊水平,不断增强影响力、传播力和竞争力,争创优秀精品期刊。
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发布时间：2022-10-28 - 摘要：<正>近日,由中国学术期刊（光盘版）电子杂志社有限公司、中国科学文献计量评价研究中心编制出版的《中国学术期刊影响因子年报（2020版）》正式发布,《电焊机》杂志再次入选《中国学术期刊影响因子年报》统计源期刊,在此感谢行业专家、学者、广大读者、作者长期以来的关注与支持,《电焊机》杂志将继续努力,进一步提高出版质量和办刊水平,不断增强影响力、传播力和竞争力,争创优秀精品期刊。
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发布时间：2022-10-28 - 摘要：<正>随着数字时代的到来和新媒体的出现,数字阅读已成为一种新的生活方式,期刊的数字化发行已成为转型发展重要举措。为促进学术传播和交流,扩大期刊传播范围、提高影响力,推进学术资源的公益使用和开放共享,《电焊机》杂志积极与多家数字期刊发行平台合作,以数字化方式进行互联网和移动互联网的发行与传播,竭力为读者提供优质服务。欢迎搜索阅读!
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发布时间：2022-10-28
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