Peng-Sheng Wei
National Sun Yat-Sen University, Taiwan
Title: Controlling microstructure via thermal science analysis during resistance spot welding
Biography
Biography: Peng-Sheng Wei
Abstract
Resistance spot welding is an important technique often used in joining thin workpieces in various aerospace, automobile and manufacturing technologies. The process involves complicated magneto-fluid dynamics, heat transfer, metallurgy, physics and chemistry, etc. This presentation theoretically and quantitatively investigates and interprets processes by realistically accounting for transient magneto-fluid mechanics, heat and species transport, and bulk resistance in workpiece, and film and constriction resistances at contact interfaces. Contact resistances are functions of temperature, hardness, contact spots, etc. Since temperature gradient and solidification rate are found, the computed morphological parameter reflecting constitutional supercooling shows that different microstructures such as planar, columnar microstructures, columnar dendrite, equiaxed grains of the weld nugget can be interpreted, predicted and controlled.
Recent Publications
1. Wei PS, Chao TC (2016) The effects of drilling parameters on pore size in keyhole mode welding. ASME Journal of Manufacturing Science and Engineering 138: 021008.
2. Chen SJ, Wang LW, Wei PS, Xiao, J, Jia YZ, Su S(2016) Sustaining the inter-wire arc in twin-wire indirect arc welding. Journal of Manufacturing Processes 21: 69-74.
3. Wei PS, Chang CC(2016) Existence of universal phase diagrams for describing general pore shape resulting from an entrapped bubble during solidification. ASME Journal of Heat Transfer 138: 104503.
4. Wei PS, Hsiao SY(2016) Effects of mass transfer coefficient on pore shape in solid. International Journal of Heat and Mass Transfer 103: 931-939.
5. Wei PS, Hsiao SY (2016) Effects of solute concentration in liquid on pore shape in solid. International Journal of Heat and Mass Transfer 103: 920-930