The Experts below are selected from a list of 2997 Experts worldwide ranked by ideXlab platform
Sung-hee Lee - One of the best experts on this subject based on the ideXlab platform.
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Study on the joining strength of laser spot Welding for automotive applications
Journal of Materials Processing Technology, 1999Co-Authors: Y.p. Yang, Y. S. Yang, Sung-hee LeeAbstract:Laser beam Welding offers a unique combination of high speed, precision and low heat distortion, compared with the conventional Welding process. This combination of advantages is especially attractive for the automotive industry. Until now automobile fabrication has widely used resistance spot Welding (RSW), however, because of geometrical and structural problems, RSW requires many Welding Machines for which reason by substituting RSW with laser spot Welding (LSW), there are savings in equipment cost. Many factors need to be considered when replacing one joining method with another. In the present case, the strength differences between laser-spot and resistance-spot welds must be ascertained before LSW can be implemented in selected applications. Therefore, the low-cycle fatigue strength and residual stress of laser spot welded specimens were measured and compared with those of RSW results in order to adapt LSW in the automobile industry. Also for strength estimation, the residual stress of the laser spot welded zone was calculated. All of the calculations were performed with the ABAQUS code on a workstation.
Menachem Kimchi - One of the best experts on this subject based on the ideXlab platform.
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Influence of Welding machine mechanical characteristics on the resistance spot Welding process and weld quality
Welding Journal, 2003Co-Authors: H Tang, Z. Feng, S J Hu, Hongyan Zhang, Menachem KimchiAbstract:Mechanical characteristics of resistance spot Welding Machines, such as stiffness, friction, and moving mass, have complex influences on the resistance Welding process and weld quality. In this paper, these influences are systematically investigated through experiments. The mechanisms of the influences are explored by analyzing process signatures, such as Welding force and electrode displacement, and other process characteristics, such as electrode alignment. A better understanding of the influences is achieved through this analysis. This study shows machine stiffness and friction affect Welding processes and weld quality. It also confirms the moving mass does not significantly affect the process and quality of resistance spot Welding.
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influence of Welding machine mechanical characteristics on the resistance spot Welding process and weld quality how machine stiffness friction and moving mass can affect Welding results
2003Co-Authors: H Tang, Z. Feng, S J Hu, Menachem KimchiAbstract:116 ABSTRACT. Mechanical characteristics of resistance spot Welding Machines, such as stiffness, friction, and moving mass, have complex influences on the resistance Welding process and weld quality. In this paper, these influences are systematically investigated through experiments. The mechanisms of the influences are ex- plored by analyzing process signatures, such as Welding force and electrode dis- placement, and other process characteris- tics, such as electrode alignment. A better understanding of the influences is achieved through this analysis. This study shows machine stiffness and friction affect Welding processes and weld quality. It also confirms the moving mass does not signif- icantly affect the process and quality of re- sistance spot Welding.
Jianmin Wang - One of the best experts on this subject based on the ideXlab platform.
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implementation of an improved power supply with simple inverters for arc Welding machine
International Transactions on Electrical Energy Systems, 2015Co-Authors: Jianmin WangAbstract:Summary The paper provides a simple control, energy recovery inverter without voltage spike. The proposed inverter can be used for arc Welding Machines. The output of the inverter has two inductors and two switches. These components are in charge of processing positive and negative cycle of alternating current (AC) load current, respectively. They are able to keep the load current continuous to avoid generating voltage spikes during commutation period. Besides, the energy in the inductors can be stored by switches. The stored energy can provide high slope current to avoid arc extinction during commutation. Besides, the energy stored in inductors can be released to improve the conversion efficiency in the next transferring cycle. The operations and design procedures of the circuit are verified. Also, the experimental results of the proposed inverter are measured to demonstrate that the scheme is effective to drive a 100 A AC arc Welding machine. Copyright © 2014 John Wiley & Sons, Ltd.
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a simple inverter for arc Welding Machines with current doubler rectifier
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Jianmin Wang, Shangchin Yen, Huangjen ChiuAbstract:This letter proposes a novel inverter scheme for arc-Welding Machines. The output rectifier replaced by a current double rectifier can reduce output ripple current effectively. Therefore, the lower inductance of the inductors can be used to prevent larger voltage spikes that occur during commutation. In comparison with that in the conventional scheme, each inductor's current in the proposed scheme is half of the output current. Hence, the proposed scheme has lower conduction losses. The turn number of the transformer winding in the proposed scheme is also lower than that in the conventional one. Finally, the 100-A ac arc-Welding machine is implemented using the proposed method.
Huangjen Chiu - One of the best experts on this subject based on the ideXlab platform.
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a simple inverter for arc Welding Machines with current doubler rectifier
IEEE Transactions on Industrial Electronics, 2011Co-Authors: Jianmin Wang, Shangchin Yen, Huangjen ChiuAbstract:This letter proposes a novel inverter scheme for arc-Welding Machines. The output rectifier replaced by a current double rectifier can reduce output ripple current effectively. Therefore, the lower inductance of the inductors can be used to prevent larger voltage spikes that occur during commutation. In comparison with that in the conventional scheme, each inductor's current in the proposed scheme is half of the output current. Hence, the proposed scheme has lower conduction losses. The turn number of the transformer winding in the proposed scheme is also lower than that in the conventional one. Finally, the 100-A ac arc-Welding machine is implemented using the proposed method.
Zelenitca Darina - One of the best experts on this subject based on the ideXlab platform.
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Design of MIG/MAG Welding Machine
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020Co-Authors: Zelenitca DarinaAbstract:The topic of this diploma thesis is the design of a MIG/MAG Welding machine, suitable for locksmiths and workshops. The diploma thesis includes the analysis of existing products from the design and technical point of view and deals with the design of Welding machine. The proposed concept focuses on interactive and modern look of the machine and comfortable manipulation and easy operation. The design itself offers a possible direction of morphology of Welding Machines in the future
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Design of MIG/MAG Welding Machine
Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020Co-Authors: Zelenitca DarinaAbstract:Tématem této diplomové práce je design MIG/MAG svářečky, určené pro zámečnické a karosářské dílny. Diplomová práce zahrnuje analýzu existujících produktů ze stránky designérské a technické a věnuje se vlastnímu návrhu svařovacího stroje. Navržený koncept klade důraz na atraktivní a moderní vzhled stroje, na komfortní manipulaci s ním a jeho snadnou obsluhu. Samotný návrh nabízí potenciální směr tvarového rozvoje svařovacích strojů v budoucnu.The topic of this diploma thesis is the design of a MIG/MAG Welding machine, suitable for locksmiths and workshops. The diploma thesis includes the analysis of existing products from the design and technical point of view and deals with the design of Welding machine. The proposed concept focuses on interactive and modern look of the machine and comfortable manipulation and easy operation. The design itself offers a possible direction of morphology of Welding Machines in the future.