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Mathematical modeling of melting during laser materials processing

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2 Author(s)
Xie, J. ; Center for Research and Education in Optics and Lasers (CREOL), Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2700 ; Kar, A.

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Melting is encountered in almost all laser materials processing. This article deals with a one-dimensional heat conduction problem to investigate the melting rate during laser materials processing. The problem is solved approximately to obtain a correlation among melt depth, power density, and laser irradiation time. Based on this correlation, the dynamics of melting, a relationship between the melt depth and power density and an average melting velocity are expressed by simple analytic formulas. These expressions are further simplified for high power densities (I≥109 W/m2). The times to reach the melting and boiling temperatures at the surface of the workpiece are also calculated. © 1997 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:81 ,  Issue: 7 )