Scaling of thermocapillary molten pool shape during laser melting

3^rd International Conference on Theoretical and Condensed Matter Physics

October 19-21, 2017 New York, USA

Peng-Sheng Wei

National Sun Yat-Sen University, Taiwan

Scientific Tracks Abstracts: J Material Sci Eng

Abstract :

The molten pool or fusion zone shape and transport variables affected by thermocapillary force during melting or welding with a distributed energy beam can be scaled as functions of specified working variables. pool. The scaling analysis considers different thicknesses of thermal and momentum boundary layers in different regions in the molten pool. Incident flux is irradiated in the central region of the free surface. The driving force is thermocapillary force balanced by shear stresses in the shear layer below the free surface. The scaling results are found to agree well with experimental data and numerical computations for different Prandtl numbers, as shown in Figure 1. Figures 2 and 3 show that scale analysis of the fusion zone depth and width agree well with numerical computations.

Biography :

Peng-Sheng Wei received Ph.D. in Mechanical Engineering Department at University of California, Davis, in 1984. He has been a professor in the Department of Mechanical and Electro-Mechanical Engineering of National Sun Yat-Sen University, Kaohsiung, Taiwan, since 1989. Dr. Wei has contributed to advancing the understanding of and to the applications of electron and laser beam, plasma, and resistance welding through theoretical analyses coupled with verification experiments. Investigations also include studies of their thermal and fluid flow processes, and formations of the defects such as humping, rippling, spiking and porosity. Dr. Wei has published more than 80 SCI journal papers, given keynote or invited speeches in international conferences more than 120 times. He is a Fellow of AWS (2007), and a Fellow of ASME (2000). He also received the Outstanding Research Achievement Awards from both the National Science Council (2004), and NSYSU (1991, 2001, 2004), the Outstanding Scholar Research Project Winner Award from National Science Council (2008), the Adams Memorial Membership Award from AWS (2008), the Warren F. Savage Memorial Award from AWS (2012), and the William Irrgang Memorial Award from AWS (2014). He has been the Xi-Wan Chair Professor of NSYSU since 2009, and Invited Distinguished Professor in the Beijing University of Technology, China, during 2015-2017.