• Prof. Peng-Sheng Wei
  • Prof. Peng-Sheng Wei
  • National Sun Yat-Sen University, Chinese Taipei
  • Title: Dynamic Electrical Resistance in Workpieces during Resistance Spot Welding
  • Abstract: Electrical resistance, which includes bulk resistance and contact resistance between two workpieces,plays an important role in electrical circuit system, and various manufacturing systems. In resistance spot welding the effects of local electrical resistance on transport variables, cooling rate, solute distribution,and nugget shape after solidification are responsible for micro structure of the fusion zone. The present model accounts for transport processes induced by electromagnetic force, heat generation and contact resistances at the faying surface and electrode–workpiece interfaces and bulk resistance in workpieces. Contact resistances are composed of film and constriction resistances,as functions of hardness, temperature, electrode force, surface conditions, etc. The computed results show that regardless of high film resistance, molten pool growth and transport processes are independent of film resistance due to delayed response time of local electric current in the early stage. A decrease in constriction resistance, however,delays nugget formation, enhances convection and solute mixing during cooling period.Factors affecting the variations of film resistance and constriction resistance are also presented.
  • Biography:
    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, 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, given keynote or invited speeches in international conferences more than 50 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.
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