The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform
Sergii Yuri Maksimov - One of the best experts on this subject based on the ideXlab platform.
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High-Speed Photography Analysis for Underwater Flux-Cored Wire Arc Cutting Process
Transactions on Intelligent Welding Manufacturing, 2020Co-Authors: Huaidong Wang, Wang Jianxin, Jiayou Wang, Sergii Yuri MaksimovAbstract:Flux-cored wire arc Cutting is a high-efficient and low-cost Underwater Cutting method, but its mechanism is still not clear; thus requires high-speed photography analysis. To overcome the difficulties caused by wire extending into the workpiece and bubbles swings, a sandwich structure was designed to observe the Underwater Cutting process. The “arc sensor and high-speed photography” synchronous acquisition system was established to obtain the Cutting current, arc voltage, and Cutting process images to analyze the Cutting mechanism. The results showed that the arc inducing mode was contact type, and the droplet transfer was mainly fine droplet transfer. The Cutting process was mainly divided into two stages. In the first stage, the Cutting wire extended into the workpiece and cut a hole from top to bottom. In the second stage, the short-circuit between the Cutting wire side and Cutting kerf’s front edge realized arc zone switching from the bottom to the top of the workpiece, which realized the continuous Cutting. This research is helpful for high-efficiency Cutting and automation.
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Research on arc Cutting mechanism and procedure of flux-cored Cutting wire in water
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Jingyu Zhao, Wang Jianxin, Jiayou Wang, Haifeng Jia, Sergii Yuri MaksimovAbstract:As an efficient Underwater Cutting method, flux-cored arc Cutting’s mechanism is not well studied because it is hard to directly observe the process. To reduce the interference from water, air Cutting process was studied at first. We studied the impact of parameters on the Cutting process by capturing Cutting workpiece’s edge images with a high-speed camera. The results showed that the arc moved up and down and meanwhile it moved with the torch in Cutting direction. Secondly, a sandwich structure was designed to observe the Underwater Cutting process. The characteristics of air and Underwater Cutting were analyzed and compared. It was found that Underwater Cutting process was similar to that in air. Thirdly, a pressure vessel device was used to simulate conditions at different water depths up to 100 m, and the influence of main characteristics was analyzed according to the Cutting mechanism. As water pressure increases, the kerf shape becomes narrower, melting speed of Cutting wire accelerates, and the stability of the arc gets worse in deep water. The relative research on Cutting mechanism and process is significant to further Cutting automation and engineering applications.
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Numerical study on the temperature field of Underwater flux-cored wire arc Cutting process
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Wang Jianxin, Jiayou Wang, Sergii Yuri Maksimov, Shi Jiahui, Liu Chuan, Zhu QingAbstract:The fast development of ocean engineering makes the Underwater Cutting more and more important. In present study, a special Underwater wet Cutting method, namely the Underwater flux-cored wire arc Cutting (FCAC) was introduced. The Underwater Cutting experiment was conducted using flux-cored wire Cutting method, and experimental as well as numerical analysis was carried out to investigate the temperature field during Underwater FCAC process. According to the mechanism of the Underwater FCAC, double ellipsoid heat source model considering arc heat as well as chemical heat was introduced, and the boundary condition of pool boiling heat transfer was selected. The calculated thermal cycles during Underwater FCAC process match well with those acquired by the experiment, which proves the model and boundary condition in this study to be applicable for Underwater FCAC. It is found that the calculated t8/5 value is shorter than 0.5 s, which is much shorter than the one of air-arc Cutting process and the one of Underwater welding process. In addition, the heat affected zone (HAZ) near the cut cavity is determined, which is expected to facilitate the further research on the Cutting mechanism, as well as the optimization of Cutting parameters.
Wang Jianxin - One of the best experts on this subject based on the ideXlab platform.
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High-Speed Photography Analysis for Underwater Flux-Cored Wire Arc Cutting Process
Transactions on Intelligent Welding Manufacturing, 2020Co-Authors: Huaidong Wang, Wang Jianxin, Jiayou Wang, Sergii Yuri MaksimovAbstract:Flux-cored wire arc Cutting is a high-efficient and low-cost Underwater Cutting method, but its mechanism is still not clear; thus requires high-speed photography analysis. To overcome the difficulties caused by wire extending into the workpiece and bubbles swings, a sandwich structure was designed to observe the Underwater Cutting process. The “arc sensor and high-speed photography” synchronous acquisition system was established to obtain the Cutting current, arc voltage, and Cutting process images to analyze the Cutting mechanism. The results showed that the arc inducing mode was contact type, and the droplet transfer was mainly fine droplet transfer. The Cutting process was mainly divided into two stages. In the first stage, the Cutting wire extended into the workpiece and cut a hole from top to bottom. In the second stage, the short-circuit between the Cutting wire side and Cutting kerf’s front edge realized arc zone switching from the bottom to the top of the workpiece, which realized the continuous Cutting. This research is helpful for high-efficiency Cutting and automation.
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Research on Underwater flux cored arc Cutting mechanism based on simulation of kerf formation
Journal of Manufacturing Processes, 2019Co-Authors: Jingyu Zhao, Yirong Wang, Wang Jianxin, Jiayou Wang, Haifeng JiaAbstract:Abstract As an efficient Underwater Cutting method, flux cored arc Cutting is not clear in its mechanism because it is difficult to directly observe the process. In this paper, we studied the mechanism of flux cored arc Cutting in air first. The impact of Cutting parameters was studied by Cutting workpiece’s edge and observing it with a high-speed camera system. Secondly, a sandwich structure was designed to observe the Underwater Cutting process. The characteristics of air and Underwater Cutting were analyzed and compared, and it showed that the arc moved up and down while moving forward with the Cutting torch in both circumstances. Based on the arc movement characteristics and the Underwater circumstance, a numerical simulation of the Underwater Cutting process was conducted. The simulation results showed that different Cutting parameters led to different Cutting mode and kerf forming. The numerical results of temperature distribution and kerf shape were consistent to the experimental data, which revealed the Cutting mechanism. This work is significant for further process optimization and Cutting automation.
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Research on arc Cutting mechanism and procedure of flux-cored Cutting wire in water
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Jingyu Zhao, Wang Jianxin, Jiayou Wang, Haifeng Jia, Sergii Yuri MaksimovAbstract:As an efficient Underwater Cutting method, flux-cored arc Cutting’s mechanism is not well studied because it is hard to directly observe the process. To reduce the interference from water, air Cutting process was studied at first. We studied the impact of parameters on the Cutting process by capturing Cutting workpiece’s edge images with a high-speed camera. The results showed that the arc moved up and down and meanwhile it moved with the torch in Cutting direction. Secondly, a sandwich structure was designed to observe the Underwater Cutting process. The characteristics of air and Underwater Cutting were analyzed and compared. It was found that Underwater Cutting process was similar to that in air. Thirdly, a pressure vessel device was used to simulate conditions at different water depths up to 100 m, and the influence of main characteristics was analyzed according to the Cutting mechanism. As water pressure increases, the kerf shape becomes narrower, melting speed of Cutting wire accelerates, and the stability of the arc gets worse in deep water. The relative research on Cutting mechanism and process is significant to further Cutting automation and engineering applications.
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Numerical study on the temperature field of Underwater flux-cored wire arc Cutting process
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Wang Jianxin, Jiayou Wang, Sergii Yuri Maksimov, Shi Jiahui, Liu Chuan, Zhu QingAbstract:The fast development of ocean engineering makes the Underwater Cutting more and more important. In present study, a special Underwater wet Cutting method, namely the Underwater flux-cored wire arc Cutting (FCAC) was introduced. The Underwater Cutting experiment was conducted using flux-cored wire Cutting method, and experimental as well as numerical analysis was carried out to investigate the temperature field during Underwater FCAC process. According to the mechanism of the Underwater FCAC, double ellipsoid heat source model considering arc heat as well as chemical heat was introduced, and the boundary condition of pool boiling heat transfer was selected. The calculated thermal cycles during Underwater FCAC process match well with those acquired by the experiment, which proves the model and boundary condition in this study to be applicable for Underwater FCAC. It is found that the calculated t8/5 value is shorter than 0.5 s, which is much shorter than the one of air-arc Cutting process and the one of Underwater welding process. In addition, the heat affected zone (HAZ) near the cut cavity is determined, which is expected to facilitate the further research on the Cutting mechanism, as well as the optimization of Cutting parameters.
Jiayou Wang - One of the best experts on this subject based on the ideXlab platform.
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High-Speed Photography Analysis for Underwater Flux-Cored Wire Arc Cutting Process
Transactions on Intelligent Welding Manufacturing, 2020Co-Authors: Huaidong Wang, Wang Jianxin, Jiayou Wang, Sergii Yuri MaksimovAbstract:Flux-cored wire arc Cutting is a high-efficient and low-cost Underwater Cutting method, but its mechanism is still not clear; thus requires high-speed photography analysis. To overcome the difficulties caused by wire extending into the workpiece and bubbles swings, a sandwich structure was designed to observe the Underwater Cutting process. The “arc sensor and high-speed photography” synchronous acquisition system was established to obtain the Cutting current, arc voltage, and Cutting process images to analyze the Cutting mechanism. The results showed that the arc inducing mode was contact type, and the droplet transfer was mainly fine droplet transfer. The Cutting process was mainly divided into two stages. In the first stage, the Cutting wire extended into the workpiece and cut a hole from top to bottom. In the second stage, the short-circuit between the Cutting wire side and Cutting kerf’s front edge realized arc zone switching from the bottom to the top of the workpiece, which realized the continuous Cutting. This research is helpful for high-efficiency Cutting and automation.
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Research on Underwater flux cored arc Cutting mechanism based on simulation of kerf formation
Journal of Manufacturing Processes, 2019Co-Authors: Jingyu Zhao, Yirong Wang, Wang Jianxin, Jiayou Wang, Haifeng JiaAbstract:Abstract As an efficient Underwater Cutting method, flux cored arc Cutting is not clear in its mechanism because it is difficult to directly observe the process. In this paper, we studied the mechanism of flux cored arc Cutting in air first. The impact of Cutting parameters was studied by Cutting workpiece’s edge and observing it with a high-speed camera system. Secondly, a sandwich structure was designed to observe the Underwater Cutting process. The characteristics of air and Underwater Cutting were analyzed and compared, and it showed that the arc moved up and down while moving forward with the Cutting torch in both circumstances. Based on the arc movement characteristics and the Underwater circumstance, a numerical simulation of the Underwater Cutting process was conducted. The simulation results showed that different Cutting parameters led to different Cutting mode and kerf forming. The numerical results of temperature distribution and kerf shape were consistent to the experimental data, which revealed the Cutting mechanism. This work is significant for further process optimization and Cutting automation.
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Research on arc Cutting mechanism and procedure of flux-cored Cutting wire in water
The International Journal of Advanced Manufacturing Technology, 2018Co-Authors: Jingyu Zhao, Wang Jianxin, Jiayou Wang, Haifeng Jia, Sergii Yuri MaksimovAbstract:As an efficient Underwater Cutting method, flux-cored arc Cutting’s mechanism is not well studied because it is hard to directly observe the process. To reduce the interference from water, air Cutting process was studied at first. We studied the impact of parameters on the Cutting process by capturing Cutting workpiece’s edge images with a high-speed camera. The results showed that the arc moved up and down and meanwhile it moved with the torch in Cutting direction. Secondly, a sandwich structure was designed to observe the Underwater Cutting process. The characteristics of air and Underwater Cutting were analyzed and compared. It was found that Underwater Cutting process was similar to that in air. Thirdly, a pressure vessel device was used to simulate conditions at different water depths up to 100 m, and the influence of main characteristics was analyzed according to the Cutting mechanism. As water pressure increases, the kerf shape becomes narrower, melting speed of Cutting wire accelerates, and the stability of the arc gets worse in deep water. The relative research on Cutting mechanism and process is significant to further Cutting automation and engineering applications.
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Numerical study on the temperature field of Underwater flux-cored wire arc Cutting process
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Wang Jianxin, Jiayou Wang, Sergii Yuri Maksimov, Shi Jiahui, Liu Chuan, Zhu QingAbstract:The fast development of ocean engineering makes the Underwater Cutting more and more important. In present study, a special Underwater wet Cutting method, namely the Underwater flux-cored wire arc Cutting (FCAC) was introduced. The Underwater Cutting experiment was conducted using flux-cored wire Cutting method, and experimental as well as numerical analysis was carried out to investigate the temperature field during Underwater FCAC process. According to the mechanism of the Underwater FCAC, double ellipsoid heat source model considering arc heat as well as chemical heat was introduced, and the boundary condition of pool boiling heat transfer was selected. The calculated thermal cycles during Underwater FCAC process match well with those acquired by the experiment, which proves the model and boundary condition in this study to be applicable for Underwater FCAC. It is found that the calculated t8/5 value is shorter than 0.5 s, which is much shorter than the one of air-arc Cutting process and the one of Underwater welding process. In addition, the heat affected zone (HAZ) near the cut cavity is determined, which is expected to facilitate the further research on the Cutting mechanism, as well as the optimization of Cutting parameters.
Liwen Cao - One of the best experts on this subject based on the ideXlab platform.
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Commonly used methods of Underwater Cutting and diamond wire saw Cutting
Proc. International Conference on Pipelines and Trenchless Technology 2009 ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technolo, 2009Co-Authors: Liwen CaoAbstract:This paper introduces commonly used methods of Underwater Cutting, such as flame Cutting, plasma arc Cutting, high-pressure water jet Cutting, explosion Cutting, mechanical Cutting, ect, and their working principles, characteristics, processing objects, working conditions, technical maturity as well as current status of developments. Using these methods for Cutting undersea oil pipeline the subject of this composite material, is very difficult, even if the completion of Cutting, efficiency is very low. We developed the use of Underwater diamond saw which can be brought to effectively Cutting oil pipeline, the technology for Underwater Cutting operations providing a new method of Cutting. At the same time, the composition and working principle of this machine, and the working process of the main components is analyzed. Diamond Cutting tools and Cutting oil pipeline single-object structure, analysis of the rope saw the work of the main components of the process. By comparative experiments, it has been verified that the machine can effectively cut the oil pipeline, steel materials and reinforced concrete. © 2009 ASCE.
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Research on Cutting technology of Underwater diamond wire saw
2008 IEEE International Conference on Automation and Logistics, 2008Co-Authors: Liwen CaoAbstract:During the maintenance and repair of Seabed oil pipelines which need cut off when they are breakage, and it is very difficult to completion the task with common Underwater Cutting ways. The experiment of cut seabed oil pipelines has been successfully done with the diamond wire saw which we design and produce independent and come to certain working efficiency. Seabed oil pipelines (which contain concrete balance layer, polyethylene rot-proof layer, polyurethane thermal retardation layer and steel pipe) is a kinds of complex material. For Cutting complex material and materials which have irregular form with diamond wire saw is a perfect technique. The paper gives an introduction of constitution and principle of operation about diamond bead wire saw. The experiments of the diamond wire saw for Cutting the seabed oil pipelines have finished. We have got all of the information and relation about the technical parameters which contain feed rate override and Cutting force, Cutting force and Cutting speed, the wear rate of diamond bead wire and the feed rate override, the wear rate of diamond bead wire and the Cutting speed through analysis and treat experiment records, and create a mathematic mode of Cutting force with regression orthogonal experiment. The conclusion that application the diamond wire saw for Cutting the seabed oil pipelines is practical and beneficial ways especially in Underwater circumstance and special construct condition of seabed oil pipelines.
Monika C Springer - One of the best experts on this subject based on the ideXlab platform.
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the management of typha domingensis typhaceae affects macroinvertebrate assemblages in the palo verde wetland guanacaste costa rica
Ecological Restoration, 2017Co-Authors: Florencia A Trama, Federico Luis Sebastian Rizo Patron Viale, Anjali Kumar, Jennifer L Stynoski, Michael Mccoy B Colton, Monika C SpringerAbstract:The Palo Verde wetland, one of the most important places for aquatic organisms in Costa Rica, is currently recovering from an invasive expansion of Typha domingensis (cattail). A monitoring program was designed to understand the potential impacts of different management plans on aquatic fauna and flora. Macroinvertebrates were sampled monthly for one year (Aug 2003–Aug 2004) using an artificial substrate method in three plots: Plot A, T. domingensis has been managed since 1987 by manual and mechanical Underwater Cutting and posterior grazing; Plot B, T. domingensis has been mechanically crushed since 2002; and Plot C, a homogeneous T. domingensis stand without active management. We identified 112 macroinvertebrate taxa from 53 families and 18 orders. Typha domingensis removal in plots under active management did not increase family or taxa richness. Instead, a greater number of rare taxa persisted in the unmanaged plot, and macroinvertebrate communities differed among plots with less than 60% of taxa shared among them. Furthermore, mean taxa richness was higher in T. domingensis cover (X = 8.56) than in the other vegetation covers (X = 4.6 to 5.54). Macroinvertebrate richness was affected by vegetation cover, sampling date, and depth while abundance was affected by depth and dissolved oxygen. Typha domingensis management is necessary to open areas that allow the development of other vegetation types, a variety of communities of macroinvertebrates, and habitat for birds. However, in order to promote a high macroinvertebrates biodiversity and ensure food sources for waterfowl, the Palo Verde wetland should retain some patches of T. domingensis distributed throughout.
