The Experts below are selected from a list of 15084 Experts worldwide ranked by ideXlab platform
Huajun Zhang - One of the best experts on this subject based on the ideXlab platform.
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Temperature Field of Double-Sided Asymmetrical MAG Backing Welding for Thick Plates
Advances in Intelligent Systems and Computing, 2015Co-Authors: Yuxi Chen, Huajun Zhang, Huabin Chen, Shanben Chen, Yu HanAbstract:A double elliptic distribution model of moving heat-source was used to double-side asymmetrical MAG backing welding of thick plate, and a 3-D non-linear FEM analysis model was established based on ABAQUS software. The transient temperature of different Arc Distance was calculated. To verify the numerical results, the temperature was measured and the calculated results agree approximately with experimental data. Farther, the effect of Arc Distance on temperature field and weld pool size was discussed. The results show that the Arc Distance will influence the distribution of temperature field and the weld shape. The Arc Distance is a very important factor to affect the quality of double-side asymmetrical MAG backing welding of thick plate.
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The Realization of Low Stress and Nonangular Distortion by Double-Sided Double Arc Welding
Journal of Manufacturing Science and Engineering, 2009Co-Authors: Huajun Zhang, Guangjun Zhang, Chunbo Cai, Hongming GaoAbstract:Control welding residual stress aid distortion is extremely important in manufacturing industry. Double-sided double are welding (DSDAW), which can control residual stress and angular distortion, is developed. Because Arc Distance between fore and rear torches is the key effective factor of angular distortions in DSDAW, its effects are not clear on the stress and angular distortions. In this study, numerical simulation is used to predict the transient temperature and welding distortion and stress with different Arc Distances. Meanwhile, the transient temperature and angular distortion are measured. The calculated results are in good agreement with the experimental results. The effects of Arc Distance on the angular distortion and stress are investigated. Lower stress and nonangular distortion is obtained at are Distances of 0 mm and 50 mm.
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fundamental studies on in process controlling angular distortion in asymmetrical double sided double Arc welding
Journal of Materials Processing Technology, 2008Co-Authors: Guangjun Zhang, Huajun Zhang, L WuAbstract:It is extremely important to reduce and control residual angular deformation from the welding processes which has negative effects on fabrication accuracy in the manufacturing industry. A new method, asymmetrical double-sided double Arc welding (ADSAW), is studied due to control residual angular distortion. Because Arc Distance between fore and rear torches and welding parameters are the key effective factors of angular distortions in ADSAW, but it is not clear about the effects of them on the angular distortions. In this study, experiments are carried out to investigate the thermal character and the effects of Arc Distance and welding parameters on the angular distortion in ADSAW. Meanwhile, a 3-D thermal elastic plastic finite element model is developed to simulate transient temperature and welding deformation with different Arc Distance and heat input. The simulated results are in a good agreement with the experimental measurements. The influence on welding deformation of the Arc Distance and heat input is investigated. In addition, the distortion mechanism and control strategy of angular distortion are clarified through numerical simulation.
Xiaoyan Zeng - One of the best experts on this subject based on the ideXlab platform.
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Influences of synergy effect between laser and Arc on laser-Arc hybrid welding of aluminum alloys
Optics & Laser Technology, 2019Co-Authors: Chen Zhang, Ming Gao, Xiaoyan ZengAbstract:Abstract ReseArchers generally believe that synergy effect between laser and Arc enables laser-Arc hybrid welding to acquire obvious advantages of efficiency and quality in welding aluminum alloys. However, influences of physical essence of the synergy effect on welding process were not clear. In this study, basic principle of the synergy effect and its influences on welding process were obtained by spectral analysis of hybrid plasma plume and high-speed photographic analysis of welding process. First, the principle of the synergy effect is that laser interacts with Arc to render electron energy level to transition. This process emits more photons, which enhance the heat input to the weld materials. The synergy effect is quantified by spectral intensity. It increases with the laser power, and decreases with the Arc current and laser-Arc Distance. It is proportional to the cross section of weld, especially the upper, and beneficial to improve the welding energy utilization. Secondly, the amount of spatter in laser-Arc hybrid welding is significantly less than that of Arc welding. The bigger weld pool, the downward melt flow, and the reduced droplet transfer force generated by the synergy effect make the transferring droplets more easily absorbed by the weld pool, which stabilizes the transfer process and reduces the generation of spatter. The reseArch results are beneficial for understanding hybrid welding mechanism and optimizing the welding process.
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effects of laser Arc Distance on corrosion behavior of single pass hybrid welded stainless clad steel plate
Materials & Design, 2017Co-Authors: Kai Kang, Ming Gao, Yosuke Kawahito, Xiaoyan ZengAbstract:Abstract Single pass laser-Arc hybrid welding of stainless clad steel plate was first carried out to develop alternatives to multi-pass welding with low efficient or single pass welding with poor corrosion resistance. The results demonstrated that the weld corrosion resistance increased with the increase of laser-Arc Distance (DLA), and the corrosion morphologies changed from big and deep ‘nail’ pits to small and shallow hemispherical pits. The weld with nearly equal corrosion resistance to the base metal (BM) could be obtained at the DLA of 9 mm, where the charge transfer resistance increased to 89% of the BM and the corrosion current density decreased by ten times to close to the BM, only 0.13 μA·cm− 2 lower. The corrosion resistance improvement had a good agreement with the microstructure homogenization and the increase of Cr content. The microstructure formation was discussed by the molten pool behavior and the laser-Arc interaction. The corrosion resistance improvement was explained by the formation and damage mechanism of the passive film.
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stabilization effect of space constraint in narrow gap laser Arc hybrid welding analyzed by approximate entropy
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Mengcheng Gong, Yousuke Kawahito, Geng Li, Xiaoyan ZengAbstract:Approximate entropy (ApEn) was developed to quantify the effects of welding parameters on the process stability of narrow gap laser-Arc hybrid welding (NGHW). The smaller the ApEn of Arc current, the higher the welding stability. A dimensionless parameter, ηA, which was the ApEn increment of the NGHW to the hybrid welding without narrow gap, was proposed to quantitatively characterize the effects of space constraint on the process stability. All the ηA were negative. It had a good agreement with the experimental values and demonstrated that the process could be stabilized by space constraint. The ηA was minimized to be −16.7%, but usually at the range from −8 to −1%. Increasing Arc current, laser-Arc Distance, and welding speed, or decreasing laser power, all increased the ηA by weakening the space constraint. Finally, the stabilization mechanism was discussed in terms of the effects of space constraint on the behaviors of laser keyhole and Arc droplet transfer.
L Wu - One of the best experts on this subject based on the ideXlab platform.
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fundamental studies on in process controlling angular distortion in asymmetrical double sided double Arc welding
Journal of Materials Processing Technology, 2008Co-Authors: Guangjun Zhang, Huajun Zhang, L WuAbstract:It is extremely important to reduce and control residual angular deformation from the welding processes which has negative effects on fabrication accuracy in the manufacturing industry. A new method, asymmetrical double-sided double Arc welding (ADSAW), is studied due to control residual angular distortion. Because Arc Distance between fore and rear torches and welding parameters are the key effective factors of angular distortions in ADSAW, but it is not clear about the effects of them on the angular distortions. In this study, experiments are carried out to investigate the thermal character and the effects of Arc Distance and welding parameters on the angular distortion in ADSAW. Meanwhile, a 3-D thermal elastic plastic finite element model is developed to simulate transient temperature and welding deformation with different Arc Distance and heat input. The simulated results are in a good agreement with the experimental measurements. The influence on welding deformation of the Arc Distance and heat input is investigated. In addition, the distortion mechanism and control strategy of angular distortion are clarified through numerical simulation.
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effects of Arc Distance on angular distortion by asymmetrical double sided Arc welding
Science and Technology of Welding and Joining, 2007Co-Authors: H J Zhang, G.-j. Zhang, L WuAbstract:AbstractPermanent angular distortion of the welded structure is developed because of non-uniform transverse shrinkage on thickness. Reducing and controlling residual angular deformation from the welding processes is extremely important in the manufacturing industry. A new method, asymmetrical double sided Arc welding (A-DSAW), is studied due to controlling residual angular distortion. But it is not clear about the effects of Arc Distance on the angular distortions. In this paper, the effects of Arc Distance on angular deformation are reseArched through developing finite element model of A-DSAW at different Arc Distances. To verify the calculated results, the temperature and angular distortion are measured. Numerical and experimental results indicate that angular distortion v. Arc Distance appears non-linear relationship and the effect mechanism of Arc Distance on angular distortion of A-DSAW is further analysed.
Sehun Rhee - One of the best experts on this subject based on the ideXlab platform.
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relationship between the weldability and the process parameters for laser tig hybrid welding of galvanized steel sheets
Materials Transactions, 2008Co-Authors: Woong-yong Choi, Sehun RheeAbstract:In the lap welding of zinc-coated steel, porosity formation is one of most significant weld defects. It is caused by zinc vapor generated between the steel sheets. Various solutions have been proposed in the past but development of more effective method remains a valuable subject to be investigated. In this study, laser-TIG hybrid welding was applied to the lap welding of zinc-coated steel without a gap. The weld defects could be eliminated by laser-TIG hybrid welding, as the leading TIG Arc partially melted the upper sheet, and the coated zinc on the lapped surfaces were vaporized or oxidized before the trailing laser irradiated on the specimen. Optimization of the process parameters for laser-Arc hybrid welding process is intrinsically sophisticated because the process has three types of parameters-Arc, laser and hybrid welding parameters. In this paper, the relationship between weldability and the process parameters of the laser beam-Arc Distance, welding current and welding speed were investigated using a full factorial experimental design. Weld quality was evaluated using the weight of the spatter, as porosity formation is a major weld defect in the lap welding of zinc-coated steel sheets. It was found that the weld quality was increased as the laser beam-Arc Distance and welding current increased, and that this decreased as welding speed increased.
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A Study on $CO_2$ Laser-TIG Hybrid Welding of Zinc-Coated Steel Sheet Part 2 : Relationship between Welding Parameters and Weldability
2006Co-Authors: Cheolhee Kim, Woong-yong Choi, Hyun-byung Chae, Jeong-han Kim, Sehun RheeAbstract:Optimization of process parameters for laser-Arc hybrid welding process is intrinsically sophisticated because the process has three kinds of parameters-Arc, laser and hybrid welding parameters. In this paper, the relationship between weldability and several process parameters such as laser beam-Arc Distance, electrode height, welding current and welding speed, were investigated by the full factorial experimental design. Weld quality was evaluated by using weight of spatters which is related with the pore area. It was found that the weld quality was increased with the increases in laser beam-Arc Distance and welding current, and decreased with the increases in electrode height and welding speed.
Guangjun Zhang - One of the best experts on this subject based on the ideXlab platform.
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The Realization of Low Stress and Nonangular Distortion by Double-Sided Double Arc Welding
Journal of Manufacturing Science and Engineering, 2009Co-Authors: Huajun Zhang, Guangjun Zhang, Chunbo Cai, Hongming GaoAbstract:Control welding residual stress aid distortion is extremely important in manufacturing industry. Double-sided double are welding (DSDAW), which can control residual stress and angular distortion, is developed. Because Arc Distance between fore and rear torches is the key effective factor of angular distortions in DSDAW, its effects are not clear on the stress and angular distortions. In this study, numerical simulation is used to predict the transient temperature and welding distortion and stress with different Arc Distances. Meanwhile, the transient temperature and angular distortion are measured. The calculated results are in good agreement with the experimental results. The effects of Arc Distance on the angular distortion and stress are investigated. Lower stress and nonangular distortion is obtained at are Distances of 0 mm and 50 mm.
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fundamental studies on in process controlling angular distortion in asymmetrical double sided double Arc welding
Journal of Materials Processing Technology, 2008Co-Authors: Guangjun Zhang, Huajun Zhang, L WuAbstract:It is extremely important to reduce and control residual angular deformation from the welding processes which has negative effects on fabrication accuracy in the manufacturing industry. A new method, asymmetrical double-sided double Arc welding (ADSAW), is studied due to control residual angular distortion. Because Arc Distance between fore and rear torches and welding parameters are the key effective factors of angular distortions in ADSAW, but it is not clear about the effects of them on the angular distortions. In this study, experiments are carried out to investigate the thermal character and the effects of Arc Distance and welding parameters on the angular distortion in ADSAW. Meanwhile, a 3-D thermal elastic plastic finite element model is developed to simulate transient temperature and welding deformation with different Arc Distance and heat input. The simulated results are in a good agreement with the experimental measurements. The influence on welding deformation of the Arc Distance and heat input is investigated. In addition, the distortion mechanism and control strategy of angular distortion are clarified through numerical simulation.