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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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Arc Characteristic and Metal Transfer of Pulse Current Horizontal Flux-Cored Arc Welding 被引量:1
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作者 Fangjie Cheng Shuai Zhang +2 位作者 Xinjie Di Dongpo Wang Jun Cao 《Transactions of Tianjin University》 EI CAS 2017年第2期101-109,共9页
In this work, we utilized high-speed video photography to investigate the arc characteristics, metal transfer behavior, and welding spatter of the pulse-current flux-cored arc welding (P-FCAW) process in the horizonta... In this work, we utilized high-speed video photography to investigate the arc characteristics, metal transfer behavior, and welding spatter of the pulse-current flux-cored arc welding (P-FCAW) process in the horizontal position. The results indicate the presence of a stable “flux pole” during both the pulse-on and pulse-off periods when the mean current ranged from 140 to 170 A. The existence of this “flux pole” was beneficial for droplet transfer in the “axial droplet transfer” mode. With respect to welding spatter, with an increase in the welding current, we observed three kinds of spatter—explosive spatter, rebounded droplet spatter, and scattering spatter. With an increase in the pulse current from 310.6 to 345.6 A, the deflection of the arc reduced from 30.4° to 16.6°, which positively influenced the arc rigidity, particularly in the horizontal position. © 2017, Tianjin University and Springer-Verlag Berlin Heidelberg. 展开更多
关键词 Bridge decks DROPS Electric arc welding Flux cored arc welding (FCAW) High speed cameras High speed photography POLES welding
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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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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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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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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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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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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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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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Seam Tracking and Visual Control for Robotic Arc Welding Based on Structured Light Stereovision 被引量:5
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作者 De Xu, Min Tan, Xiaoguang Zhao, Zhiguo Tu Laboratory of Complex Systems and Intelligence Science, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, PRC 《International Journal of Automation and computing》 EI 2004年第1期63-75,共13页
A real-time arc welding robot visual control system based on a local network with a multi-level hierarchy is developed in this paper. It consists of an intelligence and human-machine interface level, a motion planning... A real-time arc welding robot visual control system based on a local network with a multi-level hierarchy is developed in this paper. It consists of an intelligence and human-machine interface level, a motion planning level, a motion control level and a servo control level. The last three levels form a local real-time open robot controller, which realizes motion planning and motion control of a robot. A camera calibration method based on the relative movement of the end-effector connected to a robot is proposed and a method for tracking weld seam based on the structured light stereovision is provided. Combining the parameters of the cameras and laser plane, three groups of position values in Cartesian space are obtained for each feature point in a stripe projected on the weld seam. The accurate three-dimensional position of the edge points in the weld seam can be calculated from the obtained parameters with an information fusion algorithm. By calculating the weld seam parameter from position and image data, the movement parameters of the robot used for tracking can be determined. A swing welding experiment of type V groove weld is successfully conducted, the results of which show that the system has high resolution seam tracking in real-time, and works stably and efficiently. 展开更多
关键词 REAL time control visual control structured light vision camera and laser calibration weld seam tracking robotic arc welding
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Potential Oxidative Stress in the Bodies of Electric Arc Welding Operators: Effect of Photochemical Smog 被引量:4
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作者 You-GENZHU JUN-FUZHOU +2 位作者 WEI-YINGSHAN PEI-SUZHOU ANDGuI-ZHONGTONG 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2004年第4期381-389,共9页
Objective To investigate whether photochemical smog emitted during the process of electric arc welding might cause oxidative stress and potential oxidative damage in the bodies of welding operators. Methods Seventy... Objective To investigate whether photochemical smog emitted during the process of electric arc welding might cause oxidative stress and potential oxidative damage in the bodies of welding operators. Methods Seventy electric arc welding operators (WOs) and 70 healthy volunteers (HVs) were enrolled in a randomized controlled study design, in which the levels of vitamin C (VC) and vitamin E (VE) in plasma as well as the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), and the level of lipoperoxide (LPO) in erythrocytes were determined by spectrophotometry. Results Compared with the average values of the above experimental parameters in the HVs group, the average values of VC and VE in plasma as well as those of SOD, CAT and GPX in erythrocytes in the WOs group were significantly decreased (P<0.005-0.0001), while the average value of LPO in erythrocytes in the WOs group was significantly increased (P<0.0001). The findings from the partial correlation analysis on the controlling of age suggested that with a prolonged duration of exposure to photochemical smog the values of VC, VE, SOD, and GPX, except for CAT, in the WOs were decreased gradually (P<0.05-0.005), the value of LPO in the WOs was increased gradually (P<0.001), and that with the ozone dose increased in the air in each worksite VC, VE, SOD, CAT and GPX decreased (P<0.005-0.001), but LPO increased (P<0.001). The findings from the reliability analysis for the VC, VE, SOD, CAT, GPX, and LPO values which were used to reflect oxidative stress and potential oxidative damage in the WOs showed that the reliability coefficients?alpha (6 items) was 0.8021, P<0.0001, and that the standardized item alpha was 0.9577, P<0.0001. Conclusion Findings in the present study suggest that there exists an oxidative stress induced by long-term exposure to photochemical smog in the bodies of WOs, thereby causing potential oxidative and lipoperoxidative damages in their bodies. 展开更多
关键词 Oxidative stress Oxidative damage Electric arc welding WELDER Photochemical smog Ozone Nitrogen dioxide Oxidation LIPOPEROXIDATION ANTIOXIDANT Antioxidase
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Three-roller continuous setting round process for longitudinally submerged arc welding pipes 被引量:4
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作者 Xue-ying HUANG Jun ZHAO +3 位作者 Gao-chao YU Qing-dang MENG Zhen-kai MU Rui-xue ZHAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第5期1411-1426,共16页
In order to solve the problems of excess ovality and cross-section distortion of longitudinally submerged arc welding pipes after forming,a new three-roller continuous setting round process was proposed.This process c... In order to solve the problems of excess ovality and cross-section distortion of longitudinally submerged arc welding pipes after forming,a new three-roller continuous setting round process was proposed.This process can be divided into three stages:loading stage,roll bending stage and unloading stage.Based on the discretization idea,the mechanical model of the primary statically indeterminate problem of the longitudinally submerged arc welding pipes at the roll bending stage was established,and the deformation response was obtained.The simulation and theoretical results show that there are three positive bending regions and three reverse bending regions along the circumference of the pipe.The loading force of each roller shows growth,stability and downward trend with time.The error between the theoretical fitting curve and the simulated data point is very small,and the simulation results verify the reliability of the theoretical calculation.The experimental results show that the residual ovality decreases with the increase of the reduction,and the reduction of the turning point is the optimum reduction.In addition,the residual ovality of the pipe is less than 0.7%without cross-section distortion,which verifies the feasibility of this process. 展开更多
关键词 longitudinally submerged arc welding pipes three-roller continuous setting round statically indeterminate problem mechanical model ovality optimum reduction
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The comparison of multi-layer narrow-gap laser and arc welding of S32101 duplex stainless steel 被引量:7
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作者 Li Junzhao Wen Kai +3 位作者 Sun Qingjie Liu Yibo Kong Bin Zeng Xianshan 《China Welding》 CAS 2022年第4期37-47,共11页
Multi-layer narrow-gap welding of thick S32101 duplex stainless steel was conducted using laser welding with beam wobble process.The phase transition,grain size,phase proportion and crystal texture of welded joint wer... Multi-layer narrow-gap welding of thick S32101 duplex stainless steel was conducted using laser welding with beam wobble process.The phase transition,grain size,phase proportion and crystal texture of welded joint were also studied and compared with gas metal arc welding process.The microhardness and tensile strength were measured and fracture surface was analyzed to evaluate the mechanical properties of welded joints.The results showed that beam wobble technology improved the misalignment of laser beam and filler wire in narrow groove and helped to avoid incomplete fusion defects.Compared to arc welding process,the groove size and heat input were reduced,while welding efficiency was increased.The faster cooling rate and lower temperature gradient of laser wobble welding favored grain refinement,while the austenite content in weld zone decreased.Both the beam wobble and swing arc were conducive to stir weld pool,optimizing the weld microstructure and joint formation.The microstructural variance in various weld passes was caused by the heat input and heat dissipation ability.The microhardness of laser welded joint was lower,while the tensile strength and elongation percentage were higher.The fracture surface of arc welded joint was featured with shallower dimples and cleavage steps. 展开更多
关键词 narrow gap welding laser welding gas metal arc welding duplex stainless steel mechanical properties
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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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Arc characteristics of submerged arc welding with stainless steel wire 被引量:3
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作者 Ke Li Zhi-sheng Wu +1 位作者 Cui-rong Liu Feng-hua Chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第8期772-778,共7页
The arc characteristics of submerged arc welding (SAW) with stainless steel wire were studied by using Analysator Hannover (AH). The tests were carded out under the same preset arc voltage combined with different ... The arc characteristics of submerged arc welding (SAW) with stainless steel wire were studied by using Analysator Hannover (AH). The tests were carded out under the same preset arc voltage combined with different welding currents. By comparing the probability density distribution (PDD) curves of arc voltage and welding current, the changes were analyzed, the metal transfer mode in SAW was deduced, and the characteristics of a stable arc were summarized. The analysis results show that, with an increase of welding parameters, the short-circuiting peak in the PDD curves of arc voltage decreases gradually until it disappears, and the dominant metal transfer mode changes from flux-wall guided transfer to projected transfer and then to streaming transfer. Moreover, when the PDD curves of arc voltage are both unimodal and generally symmetrical, the greater the peak probability and the smaller the peak span, the more stable the arc becomes. 展开更多
关键词 submerged arc welding electric arc CHARACTERISTICS stainless steel WIRE metal transfer
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Finite element analysis of keyhole plasma arc welding based on an adaptive heat source mode 被引量:5
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作者 胡庆贤 武传松 张裕明 《China Welding》 EI CAS 2007年第2期55-58,共4页
An adaptive heat source mode is proposed to account for the keyhole effect and the characteristics of volumetric distribution along the direction of the workpiece thickness. Finite element analysis of the temperature ... An adaptive heat source mode is proposed to account for the keyhole effect and the characteristics of volumetric distribution along the direction of the workpiece thickness. Finite element analysis of the temperature field in keyhole plasma arc welding is conducted and the weld geometry is obtained. The predicted results are in agreement with the measured ones. 展开更多
关键词 keyhole plasma arc welding adaptive heat source mode finite element analysis
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Numerical Simulation of Current Density Distribution in Keyhole Double-Sided Arc Welding 被引量:3
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作者 JunshengSUN ChuansongWU +1 位作者 MinZHANG HouxiaoWANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第2期228-231,共4页
In the double-sided arc welding system (DSAW) composing of PAW+TIG arcs, the PAW arc is guided by the TIG arc so that the current mostly flows through the direction of the workpiece thickness and the penetration is gr... In the double-sided arc welding system (DSAW) composing of PAW+TIG arcs, the PAW arc is guided by the TIG arc so that the current mostly flows through the direction of the workpiece thickness and the penetration is greatly improved. To analyze the current density distribution in DSAW is beneficial to understanding of this process. Considering all kinds of dynamic factors acting on the weldpool, this paper discusses firstly the surface deformation of the weldpool and the keyhole formation in PAW+TIG DSAW process on the basis of the magnetohydrodynamic theory and variation principles. Hence, a model of the current density distribution is developed. Through numerical simulation, the current density distribution in PAW+TIG DSAW process is quantitatively analyzed. It shows that the minimal radius of keyhole formed in PAW+TIG DSAW process is 0.5 mm and 89.5 percent of current flows through the keyhole. 展开更多
关键词 PAW+TIG double-sided arc welding Surface deformation of the weldpool KEYHOLE Current density distribution
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