Finite Element Analysis of Heat Flow in Dual-Beam Laser Welded Tailored Blanks

[+] Author and Article Information
Yu-Ning Liu, E. Kannatey-Asibu

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109

J. Manuf. Sci. Eng 120(2), 272-278 (May 01, 1998) (7 pages) doi:10.1115/1.2830124 History: Received May 01, 1995; Revised April 01, 1996; Online January 17, 2008


A two-dimensional moving adaptive finite element analysis is presented for dual-beam laser welded tailored blanks. The phase change effect, temperature dependence of material properties, and convection and radiation heat transfer are considered. The simulation results show that welding with a dual-beam system to induce preheating reduces cooling rates effectively. The cooling rate in the thin blank is observed to be slightly higher than that in the thick blank at a given temperature. For example, at 650°C, 2 mm away from the weld centerline, the cooling rates are calculated to be 362°C/sec and 373°C/sec in the thick (2 mm) and thin (0.8 mm) blanks, respectively, for a welding speed of 1.5 cm/sec and beam power of 900 W on mild steel. For the same welding conditions, but with a preheating power of 400 W and inter-beam spacing of 1 cm, the cooling rates reduce to 212°C/sec and 228°C/sec in the thick and thin blanks, respectively. Experiments undertaken for verification show close correlation between the simulation and experimental results.

Copyright © 1998 by The American Society of Mechanical Engineers
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