最新刊期
期 8 ， 2019
- 摘要：This work developed a friction-stir-welding system for thin wall pipes and realized high performance Al/Cu pipe joining.Five kinds of intermetallic compounds（IMCs） with different characteristics has been found through macro-/micro-scale observation.The contents of IMCs have been detected to be Al2Cu,Al4Cu9 and AlCu（small amount） through X ray diffraction and nanoindentation.Different shear effect and pressure effect by welding tool were found to be the main formation mechanisms of different kinds of IMCs through further research and analysis.关键词：thin-wall pipe welding;friction stir welding;aluminum alloy;copper;intermetallic compounds
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发布时间：2022-03-15 - 摘要：A visual measurement method is proposed,which is the three-dimensional contour of the groove and weld surface based on the grid structure light. A visual measurement system is built with cameras,lasers,and adjustment mechanisms as core. The grid stripe visual images are collected from the weld profiles of submerged arc plate surfacing and groove butt joint. And the correlative relationship between the contour geometry change and the grid stripe distortion characteristic is analyzed. The coordinates of the grid nodes are extracted by using algorithms, such as window opening, threshold segmentation,refinement and grid cross. Three methods of surface reconstruction are tried based on the node point cloud data. The actual verification results show that it is feasible to obtain the digital contour of the weld surface based on the coordinates of the visual measurement grid nodes.关键词：vision measurement;grid structure light;digital contour
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发布时间：2022-03-15 - 摘要：The formation conditions,the influence on weld properties and the control mechanism of delta ferrite in duplex stainless steel weld are discussed. The results show that the weld structure of duplex stainless steel is a duplex structure of austenite with different morphologies distributed at grain boundaries and in grains of ferrite matrix. Among the influence factors of delta ferrite,the chemical composition and cooling rate of weld metal play a decisive role. Excessive amount of delta ferrite in the weld has an adverse effect on the corrosion resistance and crack resistance of the welded joint. The optimum ratio of austenite to ferrite in weld used in engineering should be determined by procedure qualification method. Optimizing the chemical composition of the weld is the necessary condition to control the austenite formation in the weld,while the reasonable process methods and welding parameters are the sufficient conditions to control the austenite formation.关键词：delta ferrite;weld metal;austenite formation;heat input;duplex stainless steel
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发布时间：2022-03-15 - 摘要：In this paper,the resistance spot welding of Q&P980CR steel under conventional welding parameters is studied. Due to the high carbon equivalent of Q&P980 base metal,the joints contain much hardening structure and manifest poor plasticity,resulting in interface fracture in the tensile-shear tests. Thus,the optimization scheme with the additional postheat current pulse is put forward.Based on SORPAS numerical simulation,the influence of the postheat pulse welding current and welding time on the cooling rate of section-t8/5 of the welding joints is studied,and the optimized welding parameters are determined. The experimental results show that the postheat current pulse increases the tensile-shear strength and cross-tension strength of the welding joints,and the failure mode of the joints changes from interface fracture to pullout fracture,indicating that the postheat current pulse effectively reduces the cooling rate and improves the toughness of the welding joints.关键词：resistance spot welding of Q&P steel;numerical simulation;process optimization;postheat current pulse
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发布时间：2022-03-15 - 摘要：In this paper,the finite element method（FEM）is used to analyze the post-weld dehydrogenation induction heating process for the surfacing of tube sheet on its primary side of a nuclear power evaporator. The inductor structure suitable for induction heating of tubesheet was designed. The electromagnetic-thermal coupling model of tube-sheet induction heating was established based on the ADSL program in ANSYS. The influences of the structure and parameters of induction coil on the temperature distribution during induction heating were studied. The results showed that under the suitable parameters,the installation of induction coils on both sides and bottom could greatly improve the overall heating effect and heating efficiency. Experiments of the optimal parameters were carried out and the simulated temperature distribution was agreed with the experimental results.关键词：induction heating;electromagnetic-thermal coupling;temperature field;numerical analysis
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发布时间：2022-03-15 - 摘要：Wavelet decomposition method was used to decompose the welding current of VPPA,high frequency pulse VPPA and highlow-frequency pulse VPPA into 6 different bands. The average energy of each frequency bands in the different welding methods was calculated and compared,the average energy of same frequency bands for different welding methods was contrasted simultaneously. It is found that the addition of high and low frequency pulses will affect the distribution of frequency band energy,but the whole frequency distribution is well-distributed. It is more remarkable for high frequency the influence of low frequency pulses on the average frequency band energy than high frequency pulses.关键词：pulse VPPA welding;wavelet decomposition;frequency band energy
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发布时间：2022-03-15 - 摘要：This paper presents a method to realize flexible adaptation of welding controllers to different industrial bus. Firstly,a standard Modbus RTU bus protocol interface is developed on the welding control board,and then Modbus RTU bus is adapted to different bus interfaces（such as ProfiNet,ProfibusDP,CCLink,DeviceNet,EtherNet） by bus conversion module. At the same time,bus conversion module is adapted to different bus interfaces through pin form. It can flexibly change the bus interface to connect the welding controller to different industrial bus,and lay the foundation for automatic welding in the welding workshop of automobile factory.关键词：welding controller;fieldbus;ethernet;conversion module
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发布时间：2022-03-15 - 摘要：In this paper,the research status of TIG-MIG hybrid welding is reviewed. The process characteristics of TIG-MIG composite bypass welding,TIG-MIG indirect arc welding and TIG-MIG double-sided double arc welding are introduced. The recent problems and potential applications of TIG-MIG hybrid welding are discussed in finally. TIG-MIG hybrid welding is novel hybrid welding method. It has the comprehensive advantages of high quality TIG welding and high efficiency of MIG welding. Arc coupling behavior,droplet transfer process and heat source characteristics in TIG-MIG hybrid welding are the hot topics in the future,and the TIG-MIG hybrid welding process can also be extended to special fields such as dissimilar metal welding and narrow gap welding.关键词：TIG-MIG hybrid welding;research progress;welding process
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发布时间：2022-03-15 - 摘要：In order to study the temperature characteristics, strain distribution and material flow law during differential bobbin tool friction stir welding（DBT-FSW）,an all-heat-force coupling model is established for the 5 mm thick AZ91 magnesium alloy plate based on deform-3D software to conduct numerical simulation of DBT-FSW and analyze the similarities and differences with bobbin tool friction stir welding. The results show that the temperature field of DBT-FSW in the direction of thickness shows an approximate "vase" distribution,while the temperature in the affected area of the upper shoulder is lower than that of the lower shoulder. In the horizontal direction,the temperature of DBT-FSW is higher on the retreating side than on the advancing side. As for the strain field distribution,the equivalent strain on the advancing side is higher,which is contrary to the law of temperature field distribution. In terms of material flow characteristics,the advancing side of DBT-FSW has more active material flow. In the direction of thickness of DBT-FSW,the influence area of the shaft shoulder on the side with higher rotation speed is larger,and the material in the middle part moves towards the side with higher rotation speed.关键词：differential velocity;BT-FSW;temperature field;strain field;flow characteristic
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发布时间：2022-03-15 - 摘要：The experiments of friction stir welding with different parameters are implemented on 7085-T7452 aluminum alloy. The microstructure of weld and the mechanical properties of welded joint are analyzed. The sizes of grains in nuclear zone（NZ） are compared quantitatively. The distribution characteristics of strengthening phase are emphatically studied. The results show that the NZ is composed of equiaxial recrystallized grains and the size range of these grains is 3.6～7.5 μm. The tensile strength of welded joint is over 70% of the base metal. There is rich Cu in the strengthened phase in the NZ. It can be seen that the strengthening phase at the top of NZ is more than that at the bottom of NZ.关键词：7085 aluminum alloy;friction sir welding;microstructure;mechanical properties
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发布时间：2022-03-15 - 摘要：The necessity of using titanium and titanium alloys in ship construction is expounded,the types,applications and weld ability of titanium alloys used in naval ships are reviewed. Then the characteristics and adaptability of advanced welding technology of ship titanium alloy,such as TIG,electron beam,laser welding, are described,the problem in material,process and equipment of titanium alloys used in naval ships are pointed out. Finally,it is proposed that attention should be paid to advanced titanium alloy materials preparation process and automatic,intelligent equipment development.关键词：titanium and titanium alloys;naval ships;welding technology
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发布时间：2022-03-15 - 摘要：The materials surface morphologies were observed by using scanning electron microscope（SEM）. The surface roughness and hydrophobicity,laser-MIG hybrid welding penetration depth were investigated after laser cleaning. The results indicate that the materials surface morphology,surface roughness and hydrophobicity are different with various laser cleaning parameters. Compared to the as-received and mechanically polished samples,while the laser scanning speed less than 100 mm/s,the surface roughness of aluminum alloy increased with the increase of scanning speed. The laser-arc hybrid welding qualities were improved to some extent.The maximum penetration depth was 3.374 mm while the laser scanning speed was 50 mm/s. Compared to the as-received and mechanically polished samples,the weld penetration depth increased by 23.4% and 10.1%,respectively.关键词：laser cleaning;aluminum alloy;laser-MIG hybrid welding
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发布时间：2022-03-15 - 摘要：By comparing and analyzing the available welding materials for austenitic heat-resistant steel SA-213TP310HCbN,it is considered that ERNi Cr-3 is the best choice for welding SA-213TP310HCbN. The performance of welded joints obtained by welding SA-213TP310HCbN with ERNi Cr-3 is tested,and the application of these welded joints is analyzed. It is considered that the room temperature properties of welded joints of welding SA-213TP310HCbN with ERNi Cr-3 can meet the requirements of welding procedure qualification and test specimen inspection standards,and the short-term tensile properties of welded joints at a high temperature can meet the requirements of base metal and engineering applications.关键词：SA-213TP310HCbN;welding material;joint properties;application
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发布时间：2022-03-15 - 摘要：A dissimilar metal branch pipe joint on primary pipe in a nuclear power plant has leaked,which had certain impact on nuclear safety and caused huge economic losses. The main cause of the leakage is stress corrosion cracking（SCC） due to excessive residual strain on the stainless steel side of the weldment. In this paper,the welding residual stresses of joints with different welding materials, heat input and structures are analyzed by finite element method. It is found that the residual strain near the bond line on the joint stainless steel side could be effectively reduced with the improvements such as replacing 82 filler metal with 309L,reducing heat input and adding a carbon steel transition section,thus the SCC susceptibility of joint can be mitigated.关键词：nuclear power;dissimilar metal welding;residual strain
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发布时间：2022-03-15 - 摘要：By using MAG welding with φ（Ar）80%+φ（CO2）20% shielded gas,the welding procedure test of 8 mm thick TS980QC steel plate is carried out to study the cold crack resistance sensitivity of material,the influence of welding heat input on welding quality and the comprehensive quality of welded joint. The results show that the cold crack in the welding of TS980QC high-strength steel（8 mm thick） can be avoided at a preheating temperature over 50 ℃. This steel is sensitive to welding heat input,and its performance decreases when the heat input is too high or too low. The welding wire selected in the experiment can match the performance of TS980QC high strength steel when using the appropriate technological conditions.关键词：980 steel;cold crack;heat input
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发布时间：2022-03-15 - 摘要：For the problems of residual stress and deformation of welding structure,the numerical simulations of conventional welding and welding with trailing cooling are carried out to analyze the influence of the welding with trailing cooling method on the temperature field,stress field and deformation of T-joints. The results show that comparing with conventional welding,the application of welding with trailing cooling can forms the temperature trough at the welding cold source and reduces the range and time of high temperature action. The effect of welding with trailing cooling on residual stress is mainly concentrated in the area near the weld,which can reduce the maximum residual stress of the welding structure. The maximum welding deformation is 2.89 mm for conventional welding and 2.06 mm for welding with trailing cooling. Thus,the residual deformation can be reduced by the method of welding with trailing cooling.关键词：welding with trailing cooling;temperature field;residual stress;residual deformation
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发布时间：2022-03-15 - 摘要：Optical microscope,micro-hardness tester,scanning electron microscope（SEM）,energy dispersive spectrometer（EDS） and X-ray diffractometer（XRD） were applied to analyze the microstructure and phase transformation of Shielded Metal Arc Welding（SMAW） joint for T91 heat resistant steel under 760 ℃+different holding time of annealing treatment. The test results show that the hardness of welded joints decreases obviously,and the hardness distribution decreases from base metal to heat affected zone by different holding time of annealing treatment. In the same time,the microstructure in the weld zone transforms from lath martensite to acicular martensite or plate martensite with different holding time of annealing treatment. Fine dispersed precipitated phases are mainly distributed in grain boundaries and martensitic boundaries and interior after annealing treatment of holding 6 h. The properties of materials are relatively excellent by second phase strengthening.关键词：T91 heat resistant steel;SMAW welded joint;holding time;microstructure;precipitation phase
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发布时间：2022-03-15 - 摘要：The AFA 3 G grid is the key component of the fuel assembly. The tensile breaking force of the A-A’ cross welding point directly affects the strength of the grid frame and the safe operation of the fuel assembly in the nuclear reactor. Starting with the structure composition and electron beam welding principle of the electron beam welder,this paper analyzes the stability of the tensile breaking force of the solder joint through the statistics and calculation of the tensile breaking force of the A-A’ cross welding point,according to the fluctuation of the tensile breaking force of the solder joint,and takes the pertinent measures and carries out the test.The test results show that the cause of the fluctuation of the tensile breaking force of the A-A’ cross welding point is systematic,but the main and key reason is the change of the distance between the cathode and the grid. In the process of production,it is effective to control the shape and size of A-A’ cross solder in time and measure and control the distance between the cathode and grid,and then take 220 h to replace the cathode to control the tensile breaking of the A-A’ cross welding point.关键词：frame electron beam welding;cross crossing solder joint;tensile breaking force;stability analysis
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发布时间：2022-03-15 - 摘要：By using the large bell type annealing furnace, the influence of different annealing cooling procedures on the microstructure and hardness of hacksaw blades after the 800 ℃ temperature annealing of bimetal hacksaw blades are systematically studied. The results show that in a furnace cooling speed range of 20 ℃/h（average） and discharging temperature range of 540～650 ℃,the weld,saw teeth back material hardness and metallographic structure of bimetal hacksaw blades are not sensitive to the cooling rate and discharging temperature,which shows that the cooling mode has a large adjustment space in the annealing process of bimetal hacksaw blades.关键词：bimetal hacksaw blades;anneal;cooling curve;weld hardness
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发布时间：2022-03-15 - 摘要：The causes of weld cracking in the welding repair process of railway freight cars are analyzed. The brittle structure,welding restraint stress,weld structure design,welding material structure selection,and diffusion hydrogen content in the weld metal are obtained from the welding arc. The corrosion of the surface of the base material in the near seam area and the influence of oxide on the welding quality were analyzed. The process and method of welding and repairing the railway freight car compartment were put forward. It has a good guiding significance for improving the repair quality of truck compartments.关键词：railway freight cars;welding repair;restraint stress;welding material;diffusion hydrogen;corrosion
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发布时间：2022-03-15 - 摘要：The high-chromium wear-resistant flux-cored wire with the self-made tungsten carbide is used as the welding material. By using gas metal arc welding,surfacing experiments under different welding conditions are carried out to analyze the microstructure and wear resistance of the surfacing layer and study the effect of welding procedure on the microstructure and properties of tungsten carbide reinforced high chromium wear-resistant steel. The results show that as the heat input increases,the bead penetration and width increase,the heat affected zone of the surfacing layer enlarges,while the weld reinforcement reduces. The matrix structure of the tungsten carbide reinforced high chromium wear-resistant steel surfacing layer is composed of austenite and eutectic carbide. The eutectic carbide is fishbone-shaped or rod-shaped and mainly composed of iron-chromium-tungsten phase. The spherical tungsten carbide is melted and decomposed in the matrix,and its microstructure is mainly composed of the original tungsten carbide particles,tungsten iron chromium diffusion layer and fishbone-shaped eutectic carbide. As the heat input increases,the proportion of austenite content in the matrix structure increases,the original tungsten carbide particles gradually get smaller until they are completely melted,and the hardness and wear resistance of surfacing layer reduce.关键词：high chromium steel;WC;microstructure;wear resistance
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发布时间：2022-03-15 - 摘要：Welding experiment on flux cored wire E71T-1C for nuclear power engineering were carried out and then the deposited metal were subjected to post-weld heat treatment（PWHT）,which were annealed at 480 ℃、550 ℃、620 ℃、690 ℃、760 ℃ for 16 hours.Optical microscope,material testing machine,impact testing machine and scanning electron microscope were used here. It is shown that,the microstructure is composed of ferrite,fine ferrite and second phase after the specimen is annealed below 690 ℃. When the annealing temperature reaches 760 ℃,the microstructure consists of blocky ferrite and a small amount of pearlite coupled with second phase. As the temperature increase,the precipitates nucleate and grow at grain boundary,in addition,the impact toughness value decreases. When the annealing temperature is raised to 690 ℃,the impact value tested at-20 ℃ is the lowest,that is,95 J. Typical impact fracture morphology and sound impact properties are illustrated by the macrostructure and microstructure of all deposited metal fracture samples.关键词：E71T-1C;post weld heat treatment;deposited metal;microstructure
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发布时间：2022-03-15 - 摘要：In the manufacturing process of nuclear power equipment,welding is the most basic,key and important technology. Its quality directly affects the overall quality of equipment and the operation safety of the whole nuclear plant. As the implementers of welding technology-welders and welding operators（hereinafter referred to as "welding personnel"）,their skills directly affect the quality of welding. According to the evolution and updating process of HAF603 "Management Regulations on the Qualification of Welders and Welding Operators for Civil Nuclear Safety Equipment",qualification standard for nuclear power welding personnel in China,and the comparison of the requirements of qualification and management of welding personnel between domestic and foreign regulations and standards,combining with our own experience in the qualification of welding personnel,a brief analysis and exploration are made for the exchange and discussion among colleagues.关键词：nuclear power;welding personnel;evaluation;standard
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发布时间：2022-03-15 - 摘要：HPR1000 is the "China’s business card" in "the Belt and Road" initiative,and also the mainstay and strategic task of the nuclear power development of China General Nuclear Power Corporation. The reactor pressure vessel is the "heart" of the nuclear power plant. It is the second barrier to prevent the release of radioactive materials and the core to fix and contain the internal components of the reactor. CGN HPR1000 reactor pressure vessel adopts brand-new core structure,with higher manufacturing technology standard,more difficult process, maximum pressure of rate of progress and the highest quality risk. Through wide and comprehensive analysis and research,China Nuclear Power Engineering Co.,Ltd. implements a whole domain,in-depth and improved enhanced administration of quality supervision in the first HRP1000 reactor pressure vessel manufacturing process,and eight measures are adopted simultaneously,which creates the domestic and overseas million kilowatt nuclear pressure vessel nuclear power unit critical path of zero defect "Hualong" quality and of the world’s shortest manufacturing cycle "Hualong" speed.关键词：HPR1000;reactor pressure vessel;quality supervision;quality;rate of progress
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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员、铆焊技术工人阅渎,并可作为高等学校、中等
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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。本教材可作为普通高等学校材料成形及控制工程、材料加工工程（焊接方向）、焊接技术与工程的专业课教材,同时
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发布时间：2022-03-15
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