TY - GEN
T1 - The effects of mach number on keyhole shape in high intensity beam welding or drilling
AU - Kuo, Shih C.
AU - Wei, Peng S.
AU - Debroy, Tarasankar
PY - 2009
Y1 - 2009
N2 - This work is to predict collapse of the molten layer surrounding the keyhole filled with vapor and droplets during drilling or high power density beam welding process. Investigating collapse of the liquid layer is essentially required for an understanding of pore formation in keyhole welding. The collapse of the keyhole is similar to transition between the slug and annular two-phase flows encountered in fluid flow field. In this study, a steady, averaged one-dimensional model widely used in two-phase flow areas is provided. The mixture in the core is treated as a homogeneous fluid. For the sake of clarification, friction induced by the liquid layer and energy absorbed by the vapor are neglected. It shows that, in contrast to insensitive effects of subsonic Mach number, the keyhole subject to supersonic Mach number at the base is readily enclosed or collapsed. A fundamental understanding of pore formation is revealed.
AB - This work is to predict collapse of the molten layer surrounding the keyhole filled with vapor and droplets during drilling or high power density beam welding process. Investigating collapse of the liquid layer is essentially required for an understanding of pore formation in keyhole welding. The collapse of the keyhole is similar to transition between the slug and annular two-phase flows encountered in fluid flow field. In this study, a steady, averaged one-dimensional model widely used in two-phase flow areas is provided. The mixture in the core is treated as a homogeneous fluid. For the sake of clarification, friction induced by the liquid layer and energy absorbed by the vapor are neglected. It shows that, in contrast to insensitive effects of subsonic Mach number, the keyhole subject to supersonic Mach number at the base is readily enclosed or collapsed. A fundamental understanding of pore formation is revealed.
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U2 - 10.1115/MSEC2009-84022
DO - 10.1115/MSEC2009-84022
M3 - Conference contribution
AN - SCOPUS:77953187808
SN - 9780791843611
T3 - Proceedings of the ASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
SP - 747
EP - 751
BT - Proceedings of the ASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
T2 - ASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
Y2 - 4 October 2009 through 7 October 2009
ER -