最新刊期
期 12 ， 2021
- 摘要：Process parameters are the key factors to ensure the quality of valve parts repaired by laser cladding.Therefore, with laser power, scanning speed, powder feeding speed and defocus amount as independent variables, and pool depth, micro hardness and dilution rate as optimization objectives, the influence of process parameters on the cladding of Fe-based alloy powder on 40Cr substrate was studied based on orthogonal experiment. The regression equations of dilution rate, depth of molten pool and micro hardness were established by stepwise regression analysis. Finally, a set of optimal process parameters were obtained by the intelligent algorithm of NSGA-Ⅱ and verified by experiments. The results show that the main factor for the dilution rate and micro hardness of the cladding layer is the powder feeding speed, and the most important factor for the depth of the molten pool is the laser power. The optimal process parameters obtained by NSGA-Ⅱare as follows: the laser power is 2 182 W, the scanning speed is 17.2 mm/s, the powder feeding speed is 18.4 g/min, and the defocusing amount is 1.86 mm. Under these parameters, the morphology of the cladding layer is greatly improved, the dilution rate is 20.3%, the depth of the molten pool is 373 μm, the micro hardness is increased by 21.7%, and the repair quality is effectively improved.关键词：laser cladding;process optimization;NSGA-Ⅱ;range analysis
- 47
- |
- 89
- |
- 0
发布时间：2022-03-14 - 摘要：Based on the basic principle of magnetic flux leakage（MFL） detection technology, the finite element method and COMSOL software were used to simulate the magnetic flux leakage signals of crack group and pit group with composite defects of pipeline. The results show that for the crack group, with the increase of crack strips, the amplitude of radial component Bx and axial component By of the flux density increase significantly, and the space of peak valuesof Bx shifts to both sides, and the width of By waveform increases slightly. When the metal loss volume is the same, the peak values of the radial and axial components of the flux density are not only related to the defect size, but also related to the defect distribution. For the compound pits distributed along the axial and circumferential directions, when the pits are superposed with each other, the magnetic flux leakage signal changes in the overlapping part of the pits. When the pits are separated from each other, the magnetic flux leakage signals of the two pits are independent of each other, and the signal strength does not change significantly with the increase of the pit distance. This provides a theoretical basis and reference for the analysis of the leakage signal characteristics of the defect group.关键词：magnetic flux leakage detection;pipeline complex defects;crack group;pit group;finite element simulation
- 61
- |
- 52
- |
- 0
发布时间：2022-03-14 - 摘要：The effects of Ta and Nb element content on the organization and properties of ERNiCrFe-13 nickel-based alloy wire（1# wire high Ta and low Nb, 2# wire high Nb and low Ta） deposited metal were studied comparatively by optical microscope（OM）,scanning electron microscope（SEM）,energy dispersive spectrometer（EDS）,tensile test and impact test. The results show that the microstructure of deposited metal of 1# welding wire and 2# welding wire is columnar dendrite, and there is segregation zone, and there are precipitates on the segregation zone. The precipitates of 1#welding wire are mainly carbide and Laves phase, with an area of about 0.5～2 μm2;in addition to carbide and Laves phase, the precipitated phase of 2# welding wire also exists σ Phase harmony γ/Laves phase eutectic structure, the area of precipitated phase is about 3～10 μm2;the mechanical properties of the deposited metal of 1#welding wire are much higher than the required value, meeting the safety application conditions in nuclear power engineering. The impact properties of the deposited metal of 2# welding wire are poor. On the whole, the mechanical properties of the deposited metal of 1# welding wire are better than that of 2# welding wire. During the development of nickel-based alloy wire, the formation of Laves and σ phases in the molten metal should be minimized.关键词：ERNiCrFe-13;mechanical property;γ/Laves phase eutectic structure
- 29
- |
- 27
- |
- 0
发布时间：2022-03-14 - 摘要：The study of the electrical signal characteristics under different process parameters and the establishment of the relationship between electrical signal characteristics and forming characteristics are of great significance for the realisation of highly accurate and sensitive closed-loop control of welding quality. To identify the weld width, different process experiments were set up to obtain the corresponding arc signals under different melt widths. The time-frequency characteristics of electrical signals under different processing conditions were analyzed. The time-frequency characteristic values were extracted by the Variational Mode Decomposition（VMD） method,and the fusion width was classified by the Support Vector Machine（SVM） pattern recognition algorithm. The prediction models of different processing parameters and fusion width were constructed. It is proved that the prediction accuracy is 98.6111%, which lays a great technical foundation for the development of information and intelligence in the welding process.关键词：arc;electric signal;time-frequency characteristics;melt width;prediction
- 31
- |
- 26
- |
- 0
发布时间：2022-03-14 - 摘要：Using high-speed camera, experimentally studied the formation mechanism of hump defects of laser wire deposition 3D printing on 316L stainless steel for inclined wall unsupported structure. The results show that although the wire is deposited on the substrate in the manner of liquid bridge transition, it is still prone to hump defects when stacked in multiple layers; the size of the hump defects is about 4～9 mm,and the formation period is about 430 ms; under inclined conditions, the flow effect caused by the gravity of the liquid in the weld pool is enhanced, and the shear action of the liquid on the surface tension forms the hump.关键词：laser additive manufacturing;weld pool flow;hump defect;inclined wall unsupported structure;multilayer deposition
- 68
- |
- 55
- |
- 0
发布时间：2022-03-14 - 摘要：Plasma arc welding is widely used to weld stainless steel, aluminum alloy, titanium and other materials due to its excellent welding adaptability. In this study, infrared thermography and particle tracing were used to investigate the molten pool dynamic behaviors and the weld appearance defects in lap plasma arc welding. The particle tracing results show that when the gap is 0.3 mm or 0.6 mm, the liquid metal layer on the top plate is very thin, which solidifies prematurely, and a void defect is formed at periphery. When the gap is 0.9 mm, a larger solidification zone is formed on the top plate. The liquid metal at the front part of molten pool flows backward. And then the liquid metal is blocked by the solidification zone and gathered in front of the solidification zone. However, due to the wider gap, it is difficult to form a liquid bridge and a droplet is formed. After the droplet solidifies, humping is formed. The infrared thermography results show that the increase of the gap will form a low temperature zone in the middle of the molten pool, and the area of the high temperature will also increase, which are consistent with the results obtained by particle tracing.关键词：thin stainless steel plates;lap plasma arc welding;weld appearance defects;particle tracing;infrared thermography
- 31
- |
- 43
- |
- 0
发布时间：2022-03-14 - 摘要：This paper introduces the application characteristics of high-strength steel, and summarizes the application of high-strength steel in bridge, construction machinery, automobile manufacturing, construction engineering, aircraft manufacturing,oil pipeline and other industries all over the world. Because welding is an important method of high-strength steel connection, we summarize the welding processes and characteristics of high-strength steel electrode arc welding, gas shielded welding, fluxcored wire gas shielded welding, submerged arc welding, laser welding, laser-MAG hybrid welding, friction stir welding, etc. The problems of hydrogen induced crack, cold crack and performance transformation in heat affected zone caused by complex alloy elements and various strengthening mechanisms of high-strength steel during welding are analyzed. The research and progress of welding materials to solve the welding problems of high-strength steel are introduced.关键词：high-strength steel;light weight;weldability;welding consumables
- 45
- |
- 106
- |
- 0
发布时间：2022-03-14 - 摘要：To achieve the seal of the high-pressure helium gas inside round rods, a kind of a new welding device has been developed. Aiming at the special structure of the end plug and limited manufacturing demand, we analyze the main difficulties of helium seal welding. On this basis, an integrated welding chamber was designed to replace the traditional large pressure chamber and its welding set. The welding device was used to carry out application tests, and helium leakage detection and the macro metallographic tests were carried out. Finally, helium gas can be sealed in the rod sat high pressure. The welding device has the advantages of easy operation and controlled cost. It is valuable to spread and apply on other round rod devices for the high-pressure helium sealing welding.关键词：plugging holes welding;welding set;high pressure helium gas;seal
- 30
- |
- 14
- |
- 0
发布时间：2022-03-14 - 摘要：Optical micrography, electron back scattered diffraction system, microhardness tester and universal material testing machine were used to detect and analyze the cracked T91/TP347H dissimilar steel weld joint of the reheater in a 350 MW supercritical boiler. Results show that, the crack was caused by type Ⅳ cracking of new type martensite heat resistant steel and the cracking region located in the intercritical HAZ of the T91 side in the dissimilar steel weld joint. The dissimilar steel weld joint withstood relatively higher stress during the service process, while the intercritical HAZ possesses the lowest creep strength due to its microstructure feature. Crack was formed by the mode of creep void interconnection in the intercritical HAZ during the high temperature service process and led to the final cracking.关键词：T91/TP347;dissimilar steel weld joint;cracking;type Ⅳ cracking
- 34
- |
- 67
- |
- 0
发布时间：2022-03-14 - 摘要：A large number of hot cracks in the fillet welds of SA-213TP347HFG membrane water wall which were assembled as high temperature super heater and reheater parts produced by a boiler manufacturing company. This paper describes the characteristics of crack morphology and fracture morphology through macro observation and microstructure observation. The causes of thermal crack formation are analyzed from the aspects of flat steel surface quality, welding material selection, welding heat input and restraint stress, energy spectrum analysis and so on. It is found that the poor surface cleanliness of fins and choosing ER309LSi as welding material are the main causes of a large number of hot cracks in the fillet weld of SA-213TP347HFG membrane water wall, providing a theoretical basis for the treatment of similar defects.关键词：SA-213TP347HFG;hot cracks in the fillet welds;analysis of causes;cleanliness;ER309LSi
- 31
- |
- 23
- |
- 0
发布时间：2022-03-14 - 摘要：As a key force part in a civil new typed aircraft engine, the inlet case consists of welding assemblies of outlet case, inlet one and supporting panel. Distortion during the welding manufacturing and welding recovery problem has become the critical difficulty which limits the normal use of parts. In the essay, some methods, such as welding parameters optimization, welding process control refinement, improving welding fixtures, heat-treatment shaping, local recovery and heat-treatment technology, are promoted to settle the difficulty of part development, and largely reduced the parts during welding distorting, realizing welding distortion control of inlet case assembly. This paper has important role on complicated welding inlet case processing ability improvement for equivalent structure parts welding and distortion control, and raised typical processing technology to research and promote for the complicated welding inlet case on the aircraft engine.关键词：inlet case;electro-beam welding;heat-treatment shaping;local recovery;distortion control
- 35
- |
- 48
- |
- 0
发布时间：2022-03-14 - 摘要：In order to solve the problems of heavy workload, poor stability of welding quality and high labor intensity when using traditional technology to weld the runner body overflow surface of large hydraulic turbine, a new arc additive manufacturing process is developed based on the characteristics and difficulties of arc additive technology. The results show that this technology is effective and feasible,ensures the consistency of additive size of overflow surface,realizes stable and efficient welding quality, reduces labor intensity of workers, and achieves the effect of cost decreasing and benefit increasing.关键词：arc additive manufacturing;Robot welding;runner body
- 36
- |
- 25
- |
- 0
发布时间：2022-03-14 - 摘要：The weldability of Q345R steel and 20 steel is analyzed, welding procedure TIG+MAG is formulated, the optimum welding specification parameters are determined, welding procedure test and qualification are carried out, the surface and internal quality of weld are verified by penetration testing and radiographic testing, and the properties of welded joints are verified by mechanical properties tests. Combined with the welding structure of high pressure electrode boiler body and branch pipe,the experimental results are applied to the welding of high pressure electrode boiler body and branch pipe. Ultrasonic testing and penetrant testing are performed on the welds according to the requirements of NB/T 47013.2 and NB/T 47013.5, the test results meet the grade Ⅰ quality requirements of the corresponding standards, and good welding results are obtained.关键词：dissimilar steel welding;Q345 steel;metal active gas arc welding;welding procedure;welding application
- 31
- |
- 91
- |
- 0
发布时间：2022-03-14 - 摘要：With the progress of science and technology,the welding of large structural parts has been greatly improved,but the welding of heavy load bases with high-quality welds and complex structures is still a big problem. Welding defects still accompany the entire welding process, and the quality of weld is difficult to meet the requirements of grade Ⅰ in QJ176B-2016"Technical requirements for fusion welding of land-based facilities", and the long-term load use of the base has safety risks. For this problem, a certain product base is taken as an example, the welding method selection, welding process control, stress relief and other aspects are analyzed and researched, and a set of technological method that can improve the quality of weld and reduce the deformation is proposed. By using these methods, the welding of the base achieves remarkable results, and the qualification rate of radiographic inspection of grade Ⅰ weld reaches 90%. The successful use of this method in the heavy load base provides reference for the welding of large frame type structural parts with high weld quality requirements.关键词：heavy load base;welding defect;welding deformation
- 56
- |
- 30
- |
- 0
发布时间：2022-03-14 - 摘要：With the increasing of the single unit capacity of pumped storage unit, the steel plates for the key parts of the unit are becoming thicker and thicker. In order to realize the robot welding of the large-scale pumped storage ring and reduce the labor intensity, the welding structure of the fixed guide vane of the seat ring is innovatively designed, and the complicated irregular welding bead is changed into a simple straight welding bead, through the design and parameter test of L type narrow gap MAG welding gun system suitable for T-joint narrow gap groove welding, and the integration of robot narrow gap welding system, a set of mature multi-robot narrow gap MAG welding technology has been developed and successfully applied to the welding of large pumped storage seat rings, which improves the efficiency and quality reliability of the seat ring robot welding, the labor intensity of the girth welding of the large-scale pumped storage sty ring is reduced.关键词：pumped storage;stay ring;Robot welding;narrow gap welding
- 28
- |
- 29
- |
- 0
发布时间：2022-03-14 - 摘要：The size of friction stir welding joint has a very important influence on its mechanical properties, welding speed and stability of welding process. The microstructure and properties of friction stir welded joints of 3.5 mm aluminum alloy for rail transit under different tolerance states were studied. The weld performances under the condition that the tolerance deviated greatly from the standard value were compared. The results show that when the upper and lower overlap gap of the joint is greater than 0.4 mm, the weld is easy to appear welding defects, and the welding process window is narrow; when the rotate speed is 1 600 r/min and welding speed is 1 200 mm/min, the weld performance decreases significantly with the increase of welding gap.关键词：friction welding profile joint;dimensional tolerance;weld performance
- 36
- |
- 61
- |
- 0
发布时间：2022-03-14 - 摘要：In accordance with the design standards of American passenger railway vehicle, low carbon stainless steel and low alloy high strength steel conforming to the American Standard are used for the design of the body structure. The spot welding joint on the Multi-level stainless steel car body meet the welding standard AWD D17.2 and AWS C1.1., and the form of arc welded joints are designed according to AWS D1.1 and AWS D17.2 respectively according to different plate thicknesses. The car body components and car body assemblies are suitable for modular manufacturing, and lead to small welding deformation. The visual surface flatness of side wall,side top and end wall is good, which can meet the beautiful and smooth appearance requirements of the car body. The comparative analysis of the car body static strength, flexural calculation results and test data shows that the strength of the test car body conforms to the American passenger rail vehicle design standard APTA PR-CS-S-034-99, the car body is safe and reliability.关键词：multi-level stainless steel car body;structure design;welding joint;elastic limit
- 32
- |
- 31
- |
- 0
发布时间：2022-03-14 - 摘要：In view of the complex and difficult to control the instability deformation caused by the Q235 thin plate TIG welding, this paper studies the judgment method of the thin plate instability, clarifies the instability deformation state of the thin plate in the whole welding and cooling process, and analyzes the law of instability evolution of thin plate welding.Research shows that during the TIG surfacing and cooling process of the Q235 thin plate, the instability deformation state gradually changes from the arch to the reverse saddle shape.The instability deformation is generated by the compressive stress around the weld and occurs during the welding heating process. The displacement-type internal stress loading method the of the thin plate makes the instability deformation process exist between the two deformation inflection points.关键词：thin flat plate;welding;instability;deformation;evolution
- 36
- |
- 25
- |
- 0
发布时间：2022-03-14 - 摘要：Beijing Essen Welding & Cutting Fair, as one of the two major professional welding fairs in the world, has played an important role in the development of welding technology.Through this fair, the technical features of the latest exhibits of the seam tracking system in the intelligent welding technology and the application of the seam tracking system in industrial robot are introduced. The technologies in the fair show that more and more intelligent welding system equipped with high-performance seam tracking system to meet the demands of technological development.关键词：welding;seam tracking system;welding robot;Essen fair
- 45
- |
- 79
- |
- 0
发布时间：2022-03-14 - 摘要：A digital prefabrication automatic welding production line is designed for the offshore platform operation and maintenance engineering pipeline. According to the manufacturing process, different work stations and logistics measures are set to achieve the assembly line operation mode.Through automatic and digital control system, a series of process are managed and controlled, such as raw material preparation,group alignment, feeding, welding and blanking, and the working state of field equipment and welding process data are collected in real time and are uploaded to the central control system by the bus mode, the process status are displayed with digital information. Through the interface with the MES system,the centralized monitoring of production line and production process is realized.关键词：pipeline;digitization;welding production line
- 40
- |
- 39
- |
- 0
发布时间：2022-03-14 - 摘要：In order to study the welding performance of 304L（D） dual-brand stainless steel made by a company,submerged-arc welding tests were carried out on 304L（D）dual-brand stainless steel, 304L stainless steel and 304 stainless steel respectively, and the macro-examination, non-destructive inspection and comparative analysis on the structure and properties of the welded joint were carried out.The technological parameters of SAW of 304L（D） double grade stainless steel were obtained and the performance advantages of 304L（D） double grade stainless steel were verified, which can provide reference for the actual production of 304L（D） double-brand stainless steel.
- 34
- |
- 45
- |
- 0
发布时间：2022-03-14 - 摘要：For the phenomenon that nickel-based alloy welding wire are quite different from imported products in terms of composition control, process manufacturing stability,appearance and forming quality. Through the optimization of composition design of ERNiCrMo-3 nickel-based alloy welding wire, VIM+ESR（VIM+VAR） duplex metallurgy, forging + hot rolling thermoforming technology and adjustment of annealing treatment process, the finished wire products had a higher purity and uniformity. Meanwhile, SEM, EDS, microhardness and other microstructure characterization methods were used to analyze the chemical composition, microstructure and mechanical properties of the finished wire products in detail.The results show that all indexes of finished wire products reach the domestic and overseas standards. The duplex metallurgical technology and annealing technology in this paper provide technical guidance for the industrial production of nickel-based alloy welding wires, and are suitable for production and application of other special alloy welding materials.关键词：nickel-based alloy welding wire;thermoforming technology;alloy composition;annealing treatment
- 31
- |
- 36
- |
- 0
发布时间：2022-03-14 - 摘要：Taking the self-developed and designed low-nickel nitrogenous austenitic stainless steel self-shielded fluxcored wire as study object, the effect of laser-MAG arc hybrid heat source surfacing parameters on bead penetration and depth-to-width ratio were studied. The results show that the laser power, overlaying current and arc voltage have significant effects on the penetration and depth-to-width ratio during the hybrid heat source surfacing, and the effect law is closely related to the laser-arc position; changing the laser-arc distance can adjust the penetration and depth-to-width ratio, and then affects the dilution rate; laser front and DLA（laser-arc distance）<0 mm are more beneficial to reduce the penetration and depth-to-width ratio. The dominant mechanism of penetration and depth-to-width ratio differs with different surfacing parameters. When DLA <0 mm, laser power <2.0 kW, current >160 A and voltage <28 V, the arc dominates the penetration and depth-to-width ratio; conversely, the laser dominates the penetration and depth-to-width ratio.关键词：self-shield;laser surfacing;hybrid heat source;surfacing process;penetration
- 40
- |
- 53
- |
- 0
发布时间：2022-03-14 - 摘要：Taking training textbook "Welding Equipment Operator" that recognized by national vocational skill identification system as the object, the compiling ideas of this textbook is expound, its characteristics are analyzed, and some use suggestion are puts forward. Based on the "National Professional Skill Standard for Welders"（2018 Edition） and the classification of professional levels, the "Welding Equipment Operator" is guided by professional activities and centered on professional skills, which reflects the laws of training and people’s cognition. This book covers all levels of skill requirements and related knowledge requirements, with the characteristics of standardization, standardization, preciseness,systematicness, universality and practicability. It is suggested that when using this book, the teaching content should be grasped flexibly, and the teaching methods should be used flexibly to integrate theory and practice as much as possible, so as to improve the effectiveness of skilled personnel training. At the same time, it is suggested to return to the essence of education and pay attention to the cultivation of professional quality in the use of the book, so as to make it become a powerful tool for the growth and success of welding skilled talents with both political integrity and ability.关键词：welding equipment operator;training textbook;professional skills
- 36
- |
- 31
- |
- 0
发布时间：2022-03-14 - 摘要：<正>2022年第3期——高效焊接论文征集主题:高效非熔化极焊接技术（A-TIG、热丝TIG、VPPAW、K-TIG等）;高效熔化极焊接技术（CMT、Tandem、TIME、AC-MIG、STT、MIG钎焊等）;高效埋弧焊技术（双丝、多丝、粉末、带极等）;窄间隙焊接（TIG、GMA和SAW）;复合热源（激光-电弧、PAW+MIG、双面双弧等）;带状焊丝MIG焊接;免开坡口熔透焊技术;免清根焊接技术;H型钢高效生产线;厚壁容器/大直径厚壁管/锅炉膜式水冷壁管屏的高效焊接;船舶高效焊接工艺及装备;焊接机器人;焊缝跟踪等。
- 29
- |
- 17
- |
- 0
发布时间：2022-03-14 - 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。
- 27
- |
- 9
- |
- 0
发布时间：2022-03-14 - 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。
- 26
- |
- 5
- |
- 0
发布时间：2022-03-14 - 摘要：<正>《电焊机》杂志拥有一支学术水平高、作风严谨、客观公正、认真负责、强有力的审稿专家队伍,他们为《电焊机》杂志学术质量及影响力的稳步发展,提供了坚实保障。为感谢2021年度对《电焊机》杂志作出突出贡献的审稿专家,根据2021年度审稿数据统计情况,综合考虑评审质量、评审时效和评审数量,评选出10名"优秀审稿专家"。在此,谨向为《电焊机》杂志编审工作作出贡献的各位专家及一直以来关心和支持《电焊机》杂志发展的业界朋友致以崇高的敬意!
- 48
- |
- 3
- |
- 0
发布时间：2022-03-14 -
- Postal code：610051
- Tel：028-83289008
- Technical support is provided by Beijing Founder electronics co., LTD 蜀ICP备07004068号-2
公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0