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Physical Characteristics of Welding Arc Ignition Process 被引量:1
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作者 SHI Linan SONG Yonglun XIAO Tianjiao RAN Guowei 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2012年第4期786-791,共6页
The existing research of welding arc mainly focuses on the stable combustion state and the research on the mechanism of welding arc ignition process is quite lack.The tungsten inert gas(TIG) touch arc ignition proce... The existing research of welding arc mainly focuses on the stable combustion state and the research on the mechanism of welding arc ignition process is quite lack.The tungsten inert gas(TIG) touch arc ignition process is observed via a high speed camera and the high time resolution spectral diagnosis system.The changing phenomenon of main ionized element provided the electrons in the arc ignition is found.The metallic element is the main contributor to provide the electrons at the beginning of the discharging,and then the excitated shielding gas element replaces the function of the metallic element.The electron density during the period of the arc ignition is calculated by the Stark-broadened lines of Hα.Through the discussion with the repeatability in relaxation phenomenon,the statistical regularity in the arc ignition process is analyzed.The similar rules as above are observed through the comparison with the laser-assisted arc ignition experiments and the metal inert gas(MIG) arc ignition experiments.This research is helpful to further understanding on the generation mechanism of welding arc ignition and also has a certain academic and practical significance on enriching the welding physical theoretical foundation and improving the precise monitoring on automatic arc welding process. 展开更多
关键词 welding arc ignition process physical characteristic spectral diagnosis
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Some phenomena and features of the component distributions in welding arc 被引量:1
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作者 Song Yonglun (South China University of Technology, Guangzhou) 《China Welding》 EI CAS 1995年第1期65-69,共5页
The components and their distributions both in space and in time are observed by spectroscopic method under GMAW and GTAW conditions.It reveals the features of component distributions in the arc as well as their regul... The components and their distributions both in space and in time are observed by spectroscopic method under GMAW and GTAW conditions.It reveals the features of component distributions in the arc as well as their regularities,and may lead to an essential knowledge to understand some physical and chemical phenomena in arc welding processes. 展开更多
关键词 component distribution welding arc SENSOR
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Some features of welding arc radiation 被引量:1
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作者 SONG Yonglun(Prof.South China University of Technology,Guangzhou,510641,China) 《China Welding》 EI CAS 1996年第2期96-101,共6页
This investigation is an attempt to obtain quantitative knowledge of the radiation from welding arc,which includes intensity distribution,radiant energy transfer and selfabsorption.Particular attention is paid to the ... This investigation is an attempt to obtain quantitative knowledge of the radiation from welding arc,which includes intensity distribution,radiant energy transfer and selfabsorption.Particular attention is paid to the meaning of optical thickness of welding arc at different welding current conditions.It may provide an useful basis for practical applications,such as ultraviolet radiation protection,information sensingfrom welding arc light,as well as temperature and density measurement in arc plasmas. 展开更多
关键词 welding arc RADIATION optical property
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Numerical Simulation of Radial Ultrasonic Assisted MIG Welding Arc
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作者 洪蕾 肖皓 +1 位作者 叶佳 马国红 《Journal of Shanghai Jiaotong university(Science)》 EI 2024年第2期330-338,共9页
The numerical simulation of arc was carried out for both conventional melt inert gas(MIG)welding and ultrasonic assisted melt inert gas(U-MIG)welding.Based on the model established by Fluent,the arc shape,temperature ... The numerical simulation of arc was carried out for both conventional melt inert gas(MIG)welding and ultrasonic assisted melt inert gas(U-MIG)welding.Based on the model established by Fluent,the arc shape,temperature field,and potential distribution were simulated.The study found that the shape of the arc changed when ultrasonic was added radially;the high-temperature area of the arc stretched,and the temperature peak increased.But as the current increased,the increase in temperature decreased.In addition,under the same conditions,the potential of U-MIG decreased and the pressure on the workpiece increased.To verify the accuracy of the simulation results,welding experiments under identical conditions were carried out,and a high-speed camera was used to collect dynamic pictures of the arc.The simulation results were in a favorable agreement with the experimental results,which provided a certain reference value for ultrasonic assisted arc welding. 展开更多
关键词 numerical simulation welding arc ultrasonic arc welding arc temperature
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Two-temperature modeling of lamellar cathode arc
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作者 李渊博 刘兴 叶韬 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第6期120-139,共20页
A three-dimensional, two-temperature(2T) model of a lamellar cathode arc is constructed,drawing upon the conservation equations for mass, momentum, electron energy, and heavy particle energy, in addition to Maxwell... A three-dimensional, two-temperature(2T) model of a lamellar cathode arc is constructed,drawing upon the conservation equations for mass, momentum, electron energy, and heavy particle energy, in addition to Maxwell's equations. The model aims to elucidate how the physical properties of electrons and heavy particles affect heat transfer and fluid flow in a lamellar cathode arc. This is achieved by solving and comparing the fields of electron temperature,heavy particle temperature, fluid flow, current density, and Lorentz force distribution under varying welding currents. The results show that the guiding effect of the lamellar cathode on current density, the inertial drag effect of moving arc, and the attraction effect of Lorentz force at the lamellar cathode tip primarily govern the distribution of the arc's physical fields. The guiding effect localizes the current density to the front end of the lamellar cathode, particularly where the discharge gap is minimal. Both the inertial drag effect and the attraction effect of Lorentz force direct arc flow toward its periphery. Under the influence of the aforementioned factors, the physical fields of the lamellar cathode arc undergo expansion and shift counter to the arc's direction of motion. A reduction in welding current substantially weakens the guiding effect,causing the arc's physical fields to deviate further in the direction opposite to the arc motion. In comparison with a cylindrical cathode arc, the physical fields of the lamellar cathode arc are markedly expanded, leading to a reduction in current density, electron temperature, heavy particle temperature, cathode jet flow velocity, and Lorentz force. 展开更多
关键词 numerical simulation two-temperature model welding arc
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Study on gas metal arc welding of two types of TMCP steels
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作者 HUANG Zhijun 《Baosteel Technical Research》 CAS 2023年第4期22-27,共6页
Gas metal arc welding experiments were conducted on two types of steels with 0.41% carbon equivalent(Ceq) and 0.31% Cequsing WER70T wire and 20% CO_(2)and 80% Ar as shielding gas.The two types of steels show satisfact... Gas metal arc welding experiments were conducted on two types of steels with 0.41% carbon equivalent(Ceq) and 0.31% Cequsing WER70T wire and 20% CO_(2)and 80% Ar as shielding gas.The two types of steels show satisfactory weldability.The transition temperatures of 50% upper shelf energy(Tk0.5) for Charpy-V impact test of both the welded joints are below-40 ℃.However, the toughness of the fusion line zone and heat-affected zone(HAZ) of the two steel joints exhibits differences, with the toughness of 0.41% Ceqsteel being better than that of 0.31% Ceqsteel.The Tk0.5of the fusion line zone and the HAZ of 0.41% Ceqsteel is below-60℃,whereas that of 0.31% Ceqsteel is above-40℃.The welded joint of 0.41% Ceqsteel has low hardness fluctuation, while that of 0.31% Ceqsteel exhibits a narrow, softened zone, which has no obvious influence on the tested tensile strength.The coarse grain heat-affected zone(CGHAZ)microstructure of 0.41% Ceqsteel is bainite, while that of 0.31% Ceqsteel is bainite with ferrite and minor pearlite. 展开更多
关键词 thermo-mechanically controlled processing(TMCP) COMPOSITION gas metal arc welding(GMAW) mechanical properties microstructure
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Welding of Ti-6Al-4V alloy using dynamically controlled plasma arc welding process 被引量:2
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作者 陈建春 潘春旭 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1506-1512,共7页
A novel dynamically controlled plasma arc welding process was introduced,which is able tominimize heat input into the workpiece materials while maintaining desired full penetration,and it was used to weld Ti-6Al-4V al... A novel dynamically controlled plasma arc welding process was introduced,which is able tominimize heat input into the workpiece materials while maintaining desired full penetration,and it was used to weld Ti-6Al-4V alloy sheets.The microstructures,facture surfaces and microhardness of the welded joints were characterized by using optical microscope,scanning electron microscope (SEM) and Vickers microhardness tester.Comparing with welds such as gas tungsten arc and conventional plasma arc processes,the experimental results revealed the improvements when using the present process including:1) reducing prior-beta (β) grain size and prohibiting formation of hard martensite phases in the fusion zone due to the decreased heat input;and 2) better toughness and higher hardness. 展开更多
关键词 dynamically controlled plasma arc welding Ti alloy welding microstructure FRACTURE MICROHARDNESS
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Sensitivity model for prediction of bead geometry in underwater wet flux cored arc welding 被引量:1
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作者 石永华 郑泽培 黄晋 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期1977-1984,共8页
To investigate influence of welding parameters on weld bead geometry in underwater wet flux cored arc welding (FCAW), orthogonal experiments of underwater wet FCAW were conducted in the hyperbaric chamber at water d... To investigate influence of welding parameters on weld bead geometry in underwater wet flux cored arc welding (FCAW), orthogonal experiments of underwater wet FCAW were conducted in the hyperbaric chamber at water depth from 0.2 m to 60 m and mathematical models were developed by multiple curvilinear regression method from the experimental data. Sensitivity analysis was then performed to predict the bead geometry and evaluate the influence of welding parameters. The results reveal that water depth has a greater influence on bead geometry than other welding parameters when welding at a water depth less than 10 m. At a water depth deeper than 10 m, a change in travel speed affects the bead geometry more strongly than other welding parameters. 展开更多
关键词 underwater welding bead geometry sensitivity analysis flux cored arc welding (FCAW)
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COMPUTERIZED SIMULATION AND EXPERIMENTAL RESEARCH ON SOFT-SWITCHING ARC WELDING INVERTER POWER SOURCE 被引量:24
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作者 S. J. Chen S. Y. Yin L. Feng and L. Y. Li( 1) School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, China 2)National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 150001, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期128-132,共5页
Based on the existing component models in the Pspice software package, a combined model for Insulat- ed the Bipolar Transistor (IGBT) is established, in which a non - linear is introduced to represent the parasitic ... Based on the existing component models in the Pspice software package, a combined model for Insulat- ed the Bipolar Transistor (IGBT) is established, in which a non - linear is introduced to represent the parasitic capacitance. Using this model, computerized simulation is conducted for the FB - ZVZCS - PWM soft - ewitching converter,the switching and energy-transferring characteristics of the components are analyzed.The simulation results are testified by experiments.It is proved that by abopting appropriate models,computerized simulation becomes an effective tool for investigation of arc welding inverter power source. 展开更多
关键词 arc welding inverter computerized simulation.IGBT soft switching
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Electromagnetic Characteristic of Twin-wire Indirect Arc Welding 被引量:7
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作者 SHI Chuanwei ZOU Yong +1 位作者 ZOU Zengda WU Dongting 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第1期123-131,共9页
Traditional welding methods are limited in low heat input to workpiece and high welding wire melting rate. Twin-wire indirect arc(TWIA) welding is a new welding method characterized by high melting rate and low heat... Traditional welding methods are limited in low heat input to workpiece and high welding wire melting rate. Twin-wire indirect arc(TWIA) welding is a new welding method characterized by high melting rate and low heat input. This method uses two wires one connected to the negative electrode and another to the positive electrode of a direct-current(DC) power source. The workpiece is an independent, non-connected unit. A three dimensional finite element model of TWIA is devised. Electric and magnetic fields are calculated and their influence upon TWIA behavior and the welding process is discussed. The results show that with a 100 A welding current, the maximum temperature reached is 17 758 K, arc voltage is 14.646 V while maximum current density was 61 A/mm2 with a maximum Lorene force of 84.5 ~tN. The above mentioned arc parameters near the cathode and anode regions are far higher than those in the arc column region. The Lorene force is the key reason for plasma velocity direction deviated and charged particles flowed in the channel formed by the cathode, anode and upper part of arc column regions. This led to most of the energy being supplied to the polar and upper part of arc column regions. The interaction between electric and magnetic fields is a major determinant in shaping TWIA as well as heat input on the workpiece. This is a first study of electromagnetic characteristics and their influences in the TWIA welding process, and it is significant in both a theoretical and practical sense. 展开更多
关键词 twin-wire indirect arc welding ELECTROMAGNETIC SIMULATION
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The arc characteristic of ultrasonic assisted TIG welding 被引量:11
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作者 孙清洁 林三宝 +2 位作者 杨春利 范阳阳 赵国庆 《China Welding》 EI CAS 2008年第4期52-57,共6页
Many applications of ultrasonic-assisted methods were used during metal solidification, but they could not be introduced into weld pool. In this paper, a way of ultrasonic assisted TIG welding is introduced. By direct... Many applications of ultrasonic-assisted methods were used during metal solidification, but they could not be introduced into weld pool. In this paper, a way of ultrasonic assisted TIG welding is introduced. By directly imposed ultrasonic vibration on welding arc, the vibration interacts with arc plasma and passes to the weld pool. Measurement results show that arc pressure is significantly increased with the ultrasonic vibration and the arc pressure distribution models are changed. Bead-on-plate welding tests on SUS304 confirm that this technology can influence the style of metal melting and increase weld penetration depth. 展开更多
关键词 ultrasonic vibration arc welding pressure distribution weld penetration depth
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Effects of welding wire composition and welding process on the weld metal toughness of submerged arc welded pipeline steel 被引量:7
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作者 De-liang Ren Fu-ren Xiao +2 位作者 Peng Tian Xu Wang Bo Liao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第1期65-70,共6页
The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the opti... The effects of alloying elements in welding wires and submerged arc welding process on the microstructures and low-temperature impact toughness of weld metals have been investigated. The results indicate that the optimal contents of alloying elements in welding wires can improve the low-temperature impact toughness of weld metals because the proeutectoid ferrite and bainite formations can be suppressed, and the fraction of acicular ferrite increases. However, the contents of alloying elements need to vary along with the welding heat input. With the increase in welding heat input, the contents of alloying elements in welding wires need to be increased accordingly. The microstructures mainly consisting of acicular ferrite can be obtained in weld metals after four-wire submerged arc welding using the wires with a low carbon content and appropriate contents of Mn, Mo, Ti-B, Cu, Ni, and RE, resulting in the high low-temperature impact toughness of weld metals. 展开更多
关键词 pipeline steel welding wire submerged arc welding impact toughness acicular ferrite welding heat input
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FRACTAL RESEARCH ON CRACKS PROPAGATION OF GAS PIPELINE X52 STEEL WELDING LINE UNDER HYDROGEN ENVIRONMENT 被引量:5
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作者 S.H. Dong , Y.M. Lu, Y. Zhang and Q. Wu (Mechanics Electronic Department, University of Petroleum, Beijing 102200, China) (Department of Material Physics, University of Science and Technology Beijing, Beijing 100083, China) (Yan Shan University, Qinhuangd 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2001年第3期219-226,共8页
Based on the theory of hydrogen enhanced localized plasticity of the hydrogen induced cracking and the consideration of the effect of the residual stress produced by eliminated stress heat-treatment, a fractal model o... Based on the theory of hydrogen enhanced localized plasticity of the hydrogen induced cracking and the consideration of the effect of the residual stress produced by eliminated stress heat-treatment, a fractal model of hydrogen induced cracking was presented, and the relationships among the effective surface energy (H), fractal dimension D and stress intensity factor of hydrogen induced cracking, KIH, for welding pipeline under hydrogen environment was set up, from which the relationship of D and KISCC was obtained. The model has been verified experimentally to be correct. 展开更多
关键词 Crack initiation Electric arc welding Environmental impact Fractals HYDROGEN
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Optimizing the Pulsed Current Gas Tungsten Arc Welding Parameters 被引量:9
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作者 M.Balasubramanian V.Jayabalan V. Balasubramanian 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第6期821-825,共5页
The selection of process parameter in the gas tungsten arc (GTA) welding of titanium alloy was presented for obtaining optimum grain size and hardness. Titanium alloy (Ti-6Al-4V) is one of the most important non-f... The selection of process parameter in the gas tungsten arc (GTA) welding of titanium alloy was presented for obtaining optimum grain size and hardness. Titanium alloy (Ti-6Al-4V) is one of the most important non-ferrous metals which offers great potential application in aerospace, biomedical and chemical industries, because of its low density (4.5 g/cm^3), excellent corrosion resistance, high strength, attractive fracture behaviour and high melting point (1678℃). The preferred welding process for titanium alloy is frequent GTA welding due to its comparatively easier applicability and better economy. In the case of single pass (GTA) welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. Many considerations come into the picture and one needs to carefully balance various pulse current parameters to reach an optimum combination. Four factors, five level, central composite, rotatable design matrix were used to optimize the required number of experimental conditions. Mathematical models were developed to predict the fusion zone grain size using analysis of variance (ANOVA) and regression analysis. The developed models were optimized using the traditional Hooke and Jeeve's algorithm. Experimental results were provided to illustrate the proposed approach. 展开更多
关键词 Pulsed current Gas tungsten arc welding Titanium alloy Design of experiments ANOVA Hooke and Jeeve's algorithm Grain size HARDNESS
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Gas tungsten arc welding of CP-copper to 304 stainless steel using different filler materials 被引量:5
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作者 Sajjad Gholami SHIRI Mohsen NAZARZADEH +1 位作者 Mahmood SHARIFITABAR Mehdi Shafiee AFARANI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2937-2942,共6页
The dissimilar joining of CP-copper to 304 stainless steel was performed by gas tungsten arc welding process using different filler materials. The results indicated the formation of defect free joint by using copper f... The dissimilar joining of CP-copper to 304 stainless steel was performed by gas tungsten arc welding process using different filler materials. The results indicated the formation of defect free joint by using copper filler material. But, the presence of some defects like solidification crack and lack of fusion caused decreasing tensile strength of other joints. In the optimum conditions, the tensile strength of the joint was 96% of the weaker material. Also, this joint was bent till to 180° without any macroscopic defects like separation, tearing or fracture. It was concluded that copper is a new and good candidate for gas tungsten arc welding of copper to 304 stainless steel. 展开更多
关键词 gas tungsten arc welding CP-copper 304 stainless steel dissimilar joint MICROSTRUCTURE mechanical properties
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Optimization of pulsed current gas tungsten arc welding process parameters to attain maximum tensile strength in AZ31B magnesium alloy 被引量:7
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作者 G.PADMANABAN V.BALASUBRAMANIAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期467-476,共10页
An empirical relationship to predict tensile strength of pulsed current gas tungsten arc welded AZ31B magnesium alloy was developed. Incorporating process parameters such as peak current, base current, pulse frequency... An empirical relationship to predict tensile strength of pulsed current gas tungsten arc welded AZ31B magnesium alloy was developed. Incorporating process parameters such as peak current, base current, pulse frequency and pulse on time were studied. The experiments were conducted based on a four-factor, five-level, central composite design matrix. The developed empirical relationship can be effectively used to predict the tensile strength of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints at 95% confidence level. The results indicate that pulse frequency has the greatest influence on tensile strength, followed by peak current, pulse on time and base current. 展开更多
关键词 AZ31B magnesium alloy pulsed current gas tungsten arc welding response surface methodology OPTIMIZATION tensile strength
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Assessment of gas tungsten arc welding thermal cycles on Inconel 718 alloy 被引量:8
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作者 M.HERNANDEZ R.R.AMBRIZ +3 位作者 R.CORTES C.M.GOMORA G.PLASCENCIA D.JARAMILLO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第3期579-587,共9页
Heat moving source models along with transient heat analysis by finite element method were used to determine weld thermal cycles and isothermal sections obtained from the application of a gas tungsten arc welding bead... Heat moving source models along with transient heat analysis by finite element method were used to determine weld thermal cycles and isothermal sections obtained from the application of a gas tungsten arc welding beads on Inconel 718 plates. Analytical (Rosenthal’s thick plate model) and finite element results show an acceptable approximation with the experimental weld thermal cycles. The isothermal sections determined by numerical simulation show a better approximation with the experimental welding profile for double-ellipse model heat distribution than Gauss model. To analyze the microstructural transformation produced by different cooling rates in the fusion and heat affected zones, Vickers microhardness measurements (profile and mapping representation) were conducted. A hardness decrement for the heat affected zone (~200 HV0.2) and fusion zone (~240 HV0.2) in comparison with base material (~350 HV0.2) was observed. This behavior has been attributed to the heterogeneous solubilization process of the γ″ phase (nickel matrix), which, according to the continuous-cooling-transformation curve, produced the Laves phase,δ and MC transition phases, generating a loss in hardness close to the fusion zone. 展开更多
关键词 Inconel 718 gas tungsten arc welding (GTAW) weld thermal cycle finite element method heat moving source
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In situ synthesis and hardness of TiC/Ti_5Si_3 composites on Ti-5Al-2.5Sn substrates by gas tungsten arc welding 被引量:5
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作者 Wen-qing Yan Le Dai Chi-bin Gui 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2013年第3期284-289,共6页
TiC/TisSi3 composites were fabricated on Ti-5A1-2.5Sn substrates by gas tungsten arc welding (GTAW). Identification of the phases was performed using X-ray diffraction (XRD). The microstructures were analyzed usin... TiC/TisSi3 composites were fabricated on Ti-5A1-2.5Sn substrates by gas tungsten arc welding (GTAW). Identification of the phases was performed using X-ray diffraction (XRD). The microstructures were analyzed using scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectrometry (EDS) and optical microscopy (OM). The Vickers hardness was measured with a micro-hardness tester. The TiC/TisSi3 composites were obtained in a double-layer track, and the Vickers hardness of the track increased by two to three times compared with the Ti-5A1-2.5Sn substrate. 展开更多
关键词 titanium alloys surface modification gas tungsten arc welding (GTAW) microstructure HARDNESS
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Research and engineering application of the arc welding pulsed controller technology 被引量:5
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作者 李桓 崔嘉 +1 位作者 牛永 杜乃成 《China Welding》 EI CAS 2005年第2期90-94,共5页
The tenacity of heat-affected zone (HAZ) will decline and the size of grains will increase, because of the overheating on HAZ when submerged are welding (SAW) is ased to thick plate with high heat input. The shapi... The tenacity of heat-affected zone (HAZ) will decline and the size of grains will increase, because of the overheating on HAZ when submerged are welding (SAW) is ased to thick plate with high heat input. The shaping will worsen when SAW is used to thin plate with high current at high speed. A new SAW technology, the pulsed direct current (DC) automatic SAW, will be put forward in this paper in order to overcome the above shortcomings. And a pulsed controller with micro-controller unit (MCU) as the core, nixie tube (NT) and keyboard as the man-machine conversation interface is developed. The main functions of the pulsed controller include the output of pulsed welding current and the working with twinwire. The research has widely prospects in application with significant meanings in theory and practical engineering. 展开更多
关键词 automatic submerged arc welding heat-affected zone PULSE micro-controller unit twin-wire
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Effect of electromagnetic interaction on microstructure and corrosion resistance of 7075 aluminium alloy during modified indirect electric arc welding process 被引量:5
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作者 J. S. REYNA-MONTOYA M. A. GARCIA-RENTERIA +3 位作者 V. L. CRUZ-HERNANDEZ F. F. CURIEL-LOPEZ L. R. DZIB-PEREZ L. A. FALCON-FRANCO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第3期473-484,共12页
The effects of applying an electromagnetic interaction of low intensity (EMILI) on the microstructure and corrosion resistance of 7075-T651 Al alloy plates (13 mm in thickness) during modified indirect electric arc (M... The effects of applying an electromagnetic interaction of low intensity (EMILI) on the microstructure and corrosion resistance of 7075-T651 Al alloy plates (13 mm in thickness) during modified indirect electric arc (MIEA) welding were investigated. The welding process was conducted in a single pass with a heat input of ~1.5 kJ/mm. The microstructural observations of the welds were correlated with the effect of EMILI on the local mechanical properties and the corrosion resistance in natural seawater by means of microhardness measurements and electrochemical impedance spectroscopy, respectively. Microstructural characterization of the welds revealed a grain refinement in the weld metal due to the electromagnetic stirring induced by EMILI of 3 mT during welding. In addition, observations in the scanning electron microscope showed that the precipitation of Cu-rich phases and segregation of eutectics were reduced in the heat affected zone (HAZ) also as an effect of EMILI. The high corrosion dissolution of the 7075-T651 welds in natural seawater and the extent of overaging in the HAZ were reduced when welding with EMILI of 3 mT. Thus, EMILI along with the MIEA technique may lead to welded joints with better microstructural characteristics, improved mechanical properties in the HAZ and reduced electrochemical activity. 展开更多
关键词 7075-T651 Al alloy modified indirect arc welding microstructural characterization corrosion resistance electromagnetic interaction
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