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| 1 | Development of ultra-narrow gap welding with constrained arc by flux band显示文摘Narrow gap welding has merits of lower residual stress and distortion, and superior mechanical properties of joints. A major problem of this process is the lack of fusion in sidewalls, hence many methods of weaving arc have been developed to increase heating effect of arc to the sidewalls. In this work, a new approach without weaving arc is attempted to ensure the penetration of sidewall, and ultra-narrow gap welding with the gap of less than 5mm was executed successfully. In this approach, the width of gap is decreased further, so that the sidewalls are made within range of arc heating to obtain the enough heat. In order to prevent the arc from being attracted by sidewall and going up along the sidewalls, two pieces of flux bands consisting of the specified aggregates are adhered to the sidewalls to constrain the arc. In addition, when flux band being heated by the arc, slag and gases are formed to shield the arc and the weld pool. This technique was tested on the welding experiment of pipeline steel with thickness of 20mm. The involved welding parameters were obtained, that is, the width of gap is 4mm, the welding current 250A, and the heat input 0.5kJ/mm, the width of heat-affected zone is 1-2mm. | 朱亮 郑韶先 陈剑虹 | 2006 | China Welding2006，15，2： | 26 |
| 2 | Characteristic of laser-MIG hybrid welding with filling additional cold wire for aluminum alloy显示文摘The weld appearance,deposition rate,welding efficiency,stability of arc,laser keyhole characteristic,and weld property were studied by using a novel laser-MIG hybrid welding process with filling wire of aluminum alloy. The results were also compared with those by conventional laser-MIG hybrid welding process. It was found that with the suitable process parameters this novel welding process for aluminum alloy was stable and final weld bead had fine appearance. Compared to conventional laser-MIG hybrid welding process,during this novel welding process the stability of arc,the laser keyhole characteristic and the weld property were similar,while the keyhole cycle frequency and keyhole opening area had differences of 1. 23% and 15. 34%,respectively,and the welding efficiency increased by about 31% without increasing heat input. | 常云峰 雷振 王旭友 滕彬 杨海锋 Gong Tinghe | 2018 | China Welding2018，27，3： | 20 |
| 3 | Research on laser-arc hybrid welding technology for long-distance pipeline construction显示文摘In recent years,the research on pipeline laser-arc hybrid welding technology has been the important and difficult in the field of welding all over the world. China Petroleum Pipeline Research Institute Co. Ltd. has firstly developed pipeline laser-arc hybrid welding system in China,and executed the welding tests based on X70/X80 steel. Preliminary experiment results showed that hybrid welding could meet the requirements of related standards such as API1104,ASME,etc.,the mechanical properties of girth seam are qualified in the case that there were no internal defects. With the development of high-power fiber laser and the continuous improvement of welding equipment,laser-arc hybrid welding technology for pipeline field welding will be available soon. | 曾惠林 许远斌 王长江 何金昆 | 2018 | China Welding2018，27，3： | 17 |
| 4 | A new weld repair technique for friction stir welded aluminium structure:inertia friction pull plug welding显示文摘The paper gives an analysis on technical characteristics of repair techniques for friction stir welding defects. To overcome the defects,a new repair technique, inertia friction pull plug welding( IFPPW), was researched and its equipment was developed as well. Elementary datum was achieved by investigating the influences of technological parameters on mechanical properties and by analyzing the structural characteristics of repair joint with IFPPW. The study shows that the stability and reliability of welding process of IFPPW can be guaranteed through the constant energy from the flywheel.Integrated with the advantages of friction pull plug welding,the IFPPW,free from back anvil,is considered as a promising technique in repair of termination keyhole of bobbin tool friction stir welding and point-like defects in aluminum alloy welding. | 王国庆 赵衍华 张丽娜 白景斌 朱瑞灿 | 2017 | China Welding2017，26，4： | 17 |
| 5 | Microstructure and porosity analysis in ultrasonic assisted TIG welding of 2014 aluminum alloy显示文摘 | 袁鹤然 林三宝 杨春利 范成磊 王帅 | 2011 | China Welding2011，20，1： | 16 |
| 6 | Microstructure and mechanical properties of the joint of 6061 aluminum alloy by plasma-MIG hybrid welding显示文摘Plasma-MIG( metal inert gas arc welding) hybrid welding of 6061 aluminum alloy with 6 mm thickness using ER5356 welding wire was carried out. The microstructures and mechanical properties of the welded joint were investigated by optical microscopy,X-ray diffraction( XRD),energy dispersive spectroscopy( EDS),tensile test,hardness test and scanning electron microscope( SEM) were used to judge the type of tensile fracture. The results showed that the tensile strength of welded joint was 142 MPa which was 53. 6% of the strength of the base metal. The welding seam zone was characterized by dendritic structure. In the fusion zone,the columnar grains existed at one side of the welding seam. The fibrous organization was found in the base metal,and also in the heat affected zone( HAZ) where the recrystallization occurred. The HAZ was the weakest position of the welded joint due to the coarsening of Mg_2Si phase. The type of tensile fracture was ductile fracture. | 王誉静 魏波 郭阳阳 刘正 潘厚宏 | 2017 | China Welding2017，26，2： | 14 |
| 7 | Development of a welding system for 3D steel rapid prototyping process显示文摘Metal device rapid prototyping with welding is one of the research interests at present. A controlled inertial droplet transfer MAG welding (CIDTMAGW) process was developed for the 3D steel device rapid prototyping with metal deposition. In this process, by using a special designed wire feeder, a controlled inertia is imposed on the droplet formed on the wire tip and combines with the arc force to make it detached. Thus, according to the requirements of rapid prototyping, the arc heat and the droplet detaching force can be separately controlled to attain a stable and satisfactory metal deposition process. A CIDTMAGW system and a testing manipulator for the 3D steel device rapid prototyping are presented. The required software is completed as well. The experiments proved that the geometric formation of the rapid prototyping device with welding deposition is well agreed the data of the device CAD modeling. The surface of the deposited device is comparatively smooth. | 杨世彦 韩明武 王其隆 | 2001 | China Welding2001，10，1： | 14 |
| 8 | Mathematical model and magnetic-control mechanism of the stability of rotating spray transfer显示文摘To realize stable rotating spray transfer in the region of high constant current is the key of realizing high deposition rate MAG welding process without helium in shielding gas and extending the welding current range of traditional MAG welding process. In this paper, the magnetic control mechanism of the rotating spray transfer is stated and mathematical model is given. Theoretic basis is established, which implements high deposition rate MAG welding process with magnetic control instead of helium in shielding gas. | 殷树言 陈树君 王军 徐鲁宁 | 2003 | China Welding2003，12，1： | 14 |
| 9 | Background removal and weld defect detection based on energy distribution of image显示文摘The lateral wave in ultrasonic TOFD (time of flight diffraction) image has a tail in transit time, which disturbs the detection and evaluation of shallow weld defect. Meanwhile, the lateral wave and back-wall echo that act as background add redundant data in digital image processing. In order to separate defect wave from lateral wave and prepare the way for following image processing, an algorithm of background removal method named as mean-subtraction is developed. Based on this, an improved method by statistic of the energy distribution in the image is proposed. The results show that by choosing proper threshold value according to the axial energy distribution of the image, the background can be removed automatically and the defect section becomes predominant. Meanwhile, diffractive wave of shallow weld defect can be separated from lateral wave effectively. | 迟大钊 刚铁 高双胜 | 2007 | China Welding2007，16，1： | 13 |
| 10 | Effect of filler wire on the joint properties of AZ31 magnesium alloys using CO_2 laser welding显示文摘Laser welding with filler wire of AZ31 magnesium alloys is investigated using a CO2 laser experimental system. The effect of three different filler wires on the joint properties is researched. The results show that the weld appearance can be effectively improved when using laser welding with filler wire. The microhardness and tensile strength of joints are almost the same as those of the base metal when ER AZ31 or ER AZ61 wire is adopted. However, when the filler wire of ER 5356 aluminum alloy is used, the mechanical properties of joints become worse. For ER AZ31 and ER AZ61 filler wires, the microstructure of weld zone shows small dendrite grains. In comparison, for ER 5356 filler wire, the weld shows a structure of snowy dendrites and many intermetallic compounds and eutectic phases distribute in the dendrites. These intermetallic constituents with low melting point increase the tendency of hot crack and result in fragile joint properties. Therefore, ER AZ31 and ER AZ61 wire are more suitable filler material than ER 5356 for CO2 laser welding of AZ31 magnesium alloys. | 王红英 李志军 | 2007 | China Welding2007，16，2： | 13 |
| 11 | Numerical simulation of the welding deformation for the side sill of the bogie frame based on local-global method显示文摘Considering the limitation of computational capacity,a new finite element solution is used to simulate the welding deformation of the side sill of railroad car's bogie frame based on the local-global method.Firstly,a volumetric heat source defined by a double ellipsoid is adopted to simulate the thermal distributions of the arc welding process.And then,the local models extracted from the global model are computed with refined meshes.On these bases,the global distortions of the subject studied are ascertained by transferring the inner forces of computed local models to the global model.It indicates that the local-global method is feasible for simulating the large welded structures by comparing the computed results with the corresponding actual measured values.The work provides basis for optimizing the welding sequence and clamping conditions,and has theoretical values and engineering significance in the integral design,manufacturing technique selection of the bogie frame,as well as other kinds of large welded structures. | 杨鑫华 王春生 常力 李娅娜 兆文忠 | 2007 | China Welding2007，16，4： | 13 |
| 12 | Numerical simulation of soldered joints and reliability analysis of PLCC components with J-shape leads显示文摘This paper deals with a study on SnPb and lead-free soldered joint reliability of PLCC devices with different lead counts under three kinds of temperature cycle profiles, which is based on non-linear finite element method. By analyzing the stress of soldered joints, it is found that the largest stress is at the area between the soldered joints and the leads, and analysis results indicate that the von Mises stress at the location slightly increases with the increase of lead counts. For PLCC with 84 leads the soldered joints was modeled for three typical loading (273-398 K, 218-398 K and 198-398 K) in order to study the influence of acceleration factors on the reliability of soldered joints. And the estimation of equivalent plastic strain of three different lead-free solder alloys (Sn3.8Ag0.7Cu, Sn3.5Ag and Sn37Pb) was also carried out. | 张亮 薛松柏 卢方焱 韩宗杰 王俭辛 | 2008 | China Welding2008，17，2： | 13 |
| 13 | Laser-pulsed MIG hybrid welding technology of A6N01S aluminum alloy显示文摘Welding research of A6N01S-T5 aluminum alloy profile for high-speed train was done by using laser-MIG hybrid welding and MIG welding individually. And the weld appearance,welding distortion,mechanical properties of the joints and microstructures were analyzed. The test results demonstrated that high-efficient welding for the profile can be achieved by using laser-MIG hybrid welding,the speed of which can be over 3. 0 m/min. The processing had a good gap bridging ability,even if the gap of the butt joint was up to 2. 0 mm,a good weld appearance can also be got. While the hybrid welding speed was greater than 2. 5 m/min,the welding distortion of the laser-tandem MIG hybrid joints was just about 33% of that of the MIG joints,but the welding efficiency was over 3 times of MIG welding. And tensile strength of the hybrid joints was 85% of that of A6N01S-T5 base metal,9% higher than that of the MIG joints. Fatigue properties was tested individually with pulsed tensile fatigue method in the condition of 1 × 10~7 lifetime. The test results demonstrated that the fatigue strength of the joints was a little lower than that of base material,which could be up to 115 MPa. But the fatigue strength of hybrid welding joints was 107. 5 MPa,which was 23% higher than 87 MPa of MIG welding joints. | 雷振 李小宇 徐富家 汪认 常云峰 | 2017 | China Welding2017，26，4： | 13 |
| 14 | Effect of shielding gas and defocusing on porosity during laser beam welding of 7A52 alloy显示文摘Laser beam welding is used to fabricate the 7A52 aluminum alloy plates.Effects of shielding gas and defocusing on porosities are investigated.Porosities are divided into hydrogen porosities and keyhole-induced porosities.With the increasing flow rate of the front shielding gas,the porosity ratio firstly decreases,then increases.The porosity ratio is lowest under the flow rate of 25 L/min.When the flow rate is 30 L/min,the porosity ratio is higher because the large flow rate can affect the stability of the keyhole.The porosity ratio is also higher when the flow rate is less than 25 L/min because the protection is weakened.With the increase of the defocusing,the porosity ratio firstly decreases,then increases.When the defocusing is-2 mm,the porosity ratio is lowest.When the defocusing is more than 0 mm or less than-4 mm,the porosity ratio is higher due to the movement of the instable keyhole. | 王磊 许雪宗 王克鸿 李赫 黄勇 | 2020 | China Welding2020，29，3： | 13 |
| 15 | 3DPMD-Arc-based additive manufacturing with titanium powder as raw material显示文摘The study aims to demonstrate the suitability of the 3DPMD for the production of titanium components with and without reinforcing particles in layer-by-layer design. Various demonstrators are prepared and analyzed. The microstructure, the porosity and the hardness values of the different structures are compared with each other through metallographic cross-sections. The uniform distribution of the carbides and the interaction with the matrix was analyzed by SEM and EDX.The miller-test method(ASTM G75-07) was used to determine data for the relative abrasivity of the structures. In summary, 3DPMD offers the possibility to produce titanium structures with and without reinforced particles. Using automated routines, it is possible to generate metal structures using welding robots directly from the CAD drawings. Microstructures and properties are directly related to the process and therefore material-process-property relationships are discussed within this work. | Hoefer Kevin Mayr Peter | 2019 | China Welding2019，28，1： | 12 |
| 16 | Prediction of welding distortion during assembly process of thin plate structures显示文摘Ships and automobiles are fabricated from thin plates. To assemble parts, welding is commonly employed. However, welding distortion in large thin-plate panel structure is usually cased by buckling due to the residual stress. In this study, an elastic finite element method for predicting the welding distortion of three-dimensional thin-plate structures with considering welding sequence was proposed. In this method, the inherent strain was employed to model the local shrinkage due to welding itself, and the interface element was introduced to simulate the assembly process. The proposed method was applied to study the influence of welding sequence on the buckling distortion of the large thin-plate panel structure during assembly. | 罗宇 邓德安 江晓玲 | 2005 | China Welding2005，14，2： | 12 |
| 17 | Studies on the effect of weld defect on the fatigue behavior of welded structures显示文摘Structural integrity isstated as the science and technology of margin between safety and disaster. Systematic prediction of structural integrity of critical structures such ascombustion chambers,pressure vessels,nuclear reactor components,boilers etc.,ensures the human safety,environmental protection,and the economical considerations.The present work aims at prediction of fatigue behaviour of symmetric structures like pressure vessels in the presence of common welding defects such as lack of fusion( LOF),lack of penetration( LOP) and porosity.A ring type specimen which replicates the stress pattern in thepressure vessel is considered for the study of severity of weld imperfections. Initial dimensions of weld defects are arrived by performing NDT inspection.Crack growth analysis is carried out to determine the remaining life of the welded joint with defects. | Ramu Murugan Prabhu Raja Venugobal Thyla Pudukkarai Ramaswami Sathiskumar Jothi Somu Chinnusamy | 2018 | China Welding2018，27，1： | 12 |
| 18 | Study on microstructure and properties of high velocity arc sprayed Fe_3Al intermetallic coating显示文摘Coating structural materials with Fe 3Al based intermetallics may rapidly lead to industrial application of their environment and wear resistant features. In the present study, high velocity arc spraying (HVAS) was used to in situ synthesize Fe 3Al intermetallic coating. The microstructural characterization and properties of the coating have been investigated. The microstructure was found to consist of Fe 3Al based intermetallic (D0 3 and B2) and α Fe regions together with fine oxide (α Al 2O 3) layers. TEM images of coating show that the solidified lamellae are polycrystalline and have a grain size of the order of about 150 nm , and there also exists amorphous state in some areas. It can be concluded that a very high cooling rate has been obtained during HVAS process. Moreover, the coating has relatively higher adhesion strength and microhardness, as well as lower density and porosity. | 朱子新 徐滨士 马世宁 杜则裕 | 2002 | China Welding2002，11，1： | 12 |
| 19 | Effect of heat treatment on microstucture and properties of explosive welding clad plate of TA1/Q345显示文摘The composite plate made by explosion welding technology generally has high residual stress and bed plasticity due to the explosion reinforcement. The heat treatment can play a part of eliminating stress and recovering property.In this study,TA1/Q345 clad plate made by explosive welding was annealed at different temperatures.The microstructure,micro-hardness,and tensile,shear,and bending properties were analyzed after anneal.The result shows that there is fibrous structure in the bonding zone and the plastic deformation is severe,the grain growth and fibrous structure dribbles away with the temperature increasing.Micro-hardness in the interface is bigger than it on the both sides. Tensile and shear strength reduced with the temperature of heat treatment increasing.The propel anneal temperature for TA1/Q345 clad plate is 600 | 张敏 张涛 蔡俊清 刘娟娟 李继红 | 2018 | China Welding2018，27，1： | 11 |
| 20 | Microstructure and properties of the joints of ZrO2 ceramic/ stainless steel brazed in vacuum with AgCuTi active filler metal显示文摘The ZrO_2 ceramic was successfully jointed to stainless steel by vacuum brazing with active filler metal. The AgCuTi active filler metal was used and the joining was performed at a temperature of 850 ℃ for 10 min. The microstructures of the joints were characterized by metallographic microscopy,scanning electron microscopy( SEM),and energy dispersive spectroscopy( EDS).Metallographic microscopy analysis shows that the morphology of the cross section was a sandwich structure and the Ti O is observed in the surface of ZrO_2/stainless steel. The diffusion and enrichment of the elements are the key roles in the brazing of ZrO_2 ceramic and stainless steel. The formation of TiCu compounds inhibited the further diffusion of titanium into stainless steel or the ZrO_2 ceramic to form TiO compound. In the experimental conditions,the average tensile strength is 80 MPa for the joint of ZrO_2 ceramic/Ag Cu Ti/stainless steel systems. A complete joint is formed between the ZrO2 ceramic and stainless steel with the leakage rate at the degree of 10^(-12) Pa·m^3/s. | 柳旭 黄晓猛 马会斌 史秀梅 齐岳峰 | 2018 | China Welding2018，27，2： | 11 |
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