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Professor Peng-Sheng Wei

National Sun Yat-Sen University, Kaohsiung, Taiwan

Beijing University of Technology, China

Dr. 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 (China), 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 journal papers. 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.

Topic of the Speech:
Pore Shape Development in Solid Described by Universal Phase Diagram

Abstract of the Speech:
Porosity is one of the most serious problems commonly occurring in weldments. Porous materials have also been used for functional materials to manipulate mass, momentum, energy and species transport. In order to remove and control porosity, understanding its formation is important. A pore formed in solid is a consequence of a bubble nucleated by supersaturation and entrapped by a solidification front. By accounting for transport of mass, momentum and physico-chemical equilibrium of solute gas across the bubble cap, pore shape development can be realistically predicted and described by the universal phase diagram. The pore shapes in solid can thus be generally studied.

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