alexa Peng-Sheng Wei | National Sun Yat-Sen University
ISSN: 2469-410X

Journal of Lasers, Optics & Photonics
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Peng-Sheng Wei

Peng-Sheng Wei Peng-Sheng Wei
professor
Department of Mechanical and Electro-Mechanical Engineering
National Sun Yat-Sen University
Taiwan
Biography

Dr. Peng-Sheng Wei was born in Tokyo, Japan in 1953. He returned Taiwan in 1957. He completed his education in Taiwan. After he received M.S. degree in Power Mechanical Engineering in National Tsing Hua University, Taiwan, and military service, he went to California for his further study in 1980. He 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, ROC, since 1989. Dr. Wei has contributed to advancing 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 70 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), Adams Memorial Membership Award from AWS (2008), and Warren F. Savage Memorial Award from AWS (2012). He has been the Xi-Wan Chair Professor of NSYSU since 2009.

Research Interest

Dr. Wei has contributed to advancing 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.

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Journal of Lasers, Optics & Photonics - Peng_Sheng


Mechanisms of different types of surface patterns such as rippling, gouging, undercut, and humping, and root spiking are still unclear. Pore formation is characterized by different mechanisms: (1) super-saturation of dissolved gases in liquid ahead of the solidification front, and (2) liquid entrapment such as keyhole collapse during keyhole welding. All these defects involve strong deformation of the free surface and different types of instabilities coupled with complicated transport processes. Controlling factors need to be clarified and determined.

 
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