| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Numerical analysis of plasma arc physical characteristics under additional constraint of keyhole |
| Bin Xu(徐斌)1, Fan Jiang(蒋凡)1, Shujun Chen(陈树君)1, Manabu Tanaka(田中学)2, Shinichi Tashiro(田代真一)2, Nguyen Van Anh2 |
1 Engineering Research Center of Advanced Manufacturing Technology for Automotive Components, Ministry of Education, Beijing 100124, China;
2 Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan |
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Abstract The physical characteristics of a plasma arc affect the stability of the keyhole and weld pool directly during keyhole plasma arc welding (KPAW). There will be significant change for these characteristics because of the interaction between the keyhole weld pool and plasma arc after penetration. Therefore, in order to obtain the temperature field, flow field, and arc pressure of a plasma arc under the reaction of the keyhole, the physical model of a plasma arc with a pre-set keyhole was established. In addition, the tungsten and base metal were established into the calculated domain, which can reflect the effect of plasma arc to weld pool further. Based on magneto hydrodynamics and Maxwell equations, a two-dimensional steady state mathematical model was established. Considering the heat production of anode and cathode, the distribution of temperature field, flow field, welding current density, and plasma arc pressure were solved out by the finite difference method. From the calculated results, it is found that the plasma arc was compressed a second time by the keyhole. This additional constraint results in an obvious rise of the plasma arc pressure and flow velocity at the minimum diameter place of the keyhole, while the temperature field is impacted slightly. Finally, the observational and metallographic experiments are conducted, and the shapes of plasma arc and fusion line agree with the simulated results generally.
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Received: 30 July 2017
Revised: 23 September 2017
Accepted manuscript online:
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PACS:
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47.65.-d
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(Magnetohydrodynamics and electrohydrodynamics)
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47.75.+f
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(Relativistic fluid dynamics)
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52.25.Dg
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(Plasma kinetic equations)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51505008) and the National Science and Technology Major Project of China (Grant No. 2014ZX04001-171). |
Corresponding Authors:
Fan Jiang
E-mail: jiangfan@bjut.edu.cn
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Cite this article:
Bin Xu(徐斌), Fan Jiang(蒋凡), Shujun Chen(陈树君), Manabu Tanaka(田中学), Shinichi Tashiro(田代真一), Nguyen Van Anh Numerical analysis of plasma arc physical characteristics under additional constraint of keyhole 2018 Chin. Phys. B 27 034701
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