Library Subscription: Guest
Home Archives Thermal Letter Officers Future meetings Assembly for International Heat Transfer Conferences
International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Integrated Modeling of Transport Phenomena in Keyhole Welding with Plasma Arc

Yan Li
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

Yanhui Feng
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

Yafei Li
School of Mechanical Engineering, University of Science and Technology Beijing

Xinxin Zhang
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

Chuansong Wu
MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing, Institute of Materials Joining, Shandong University, Jinan 250061, China

DOI: 10.1615/IHTC15.pls.009408
pages 6445-6457


KEY WORDS: Numerical simulation and super-computing, MHD and plasma, Manufacturing, Plasma arc welding, Heat transfer, Keyhole effect

Abstract

Plasma arc welding involves intricate thermal, electrical, magnetic and fluid dynamics phenomena. To date, tremendous research has been carried out on the weld pool or the thermal plasma arc separately. Yet few studies have integrated the both aspects, much less the keyhole effect in addition. Accordingly, as an endeavor to advance the understanding of the transport phenomena in keyhole welding with plasma arc, a two-dimensional axisymmetric mathematical model has been developed to help gain access to the knowledge of energy conversion in the thermal plasma process and heat transfer due to the keyhole effect. In view of the extreme complexity of the arc-liquid-solid phase interactions, the keyhole geometry was pre-established according to previous experimental research. By solving a series of governing equations that contain the mass, the momentum, and the mingled thermal, electric and magnetic energy, temperature and velocity distributions were both exhibited in the arc region as well as in the workpiece, respectively. Results show that the plasma arc is easy to reach and maintain thermal stability. Moreover, arc flows, current density, and electromagnetic force were all predicted to further the understanding of thermal plasma process. It turns out that both shielding and electromagnetic force play an effective role in compressing the plasma arc. Finally, experiment was conducted on the stainless steel plate, and the measured weld pool is very close to that calculated by our model. This paper provided a better into the keyhole plasma arc welding.

Purchase $25.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page