The response of conduction mode laser weld pool dimensions, specifically weld width, to a step change in power input has been modeled using two-dimensional heat flow analysis. The goal is to develop a simplified model suitable for feedback control. The weld pool geometry was approximated by a tear-drop shape. The workpiece thermal properties were assumed to be lumped and temperature-independent. The result was a first-order weld pool thermal model. A series of experiments was performed using different welding conditions (plate thickness, step power changes, and welding speeds) to validate the model. The weld pool image was recorded using a vision system and digitized. The process time constant as calculated by the model was of the order of seconds. The response of the laser machine, estimated by the least squares method, was found to be about seconds, which is much slower than that of the weld pool. Thus, within the constraints of the assumptions on which the model is based, the entire laser welding process is considered to be dominated by the laser machine dynamics. [S1087-1357(00)00502-5]
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August 2000
Technical Papers
Modeling of Conduction Mode Laser Welding Process For Feedback Control
Fuu-Ren Tsai, Graduate Student,
Fuu-Ren Tsai, Graduate Student
Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125
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Elijah Kannatey-Asibu,, Jr., Professor
Elijah Kannatey-Asibu,, Jr., Professor
Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125
Search for other works by this author on:
Fuu-Ren Tsai, Graduate Student
Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125
Elijah Kannatey-Asibu,, Jr., Professor
Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received Aug. 1998; revised June 1999. Associate Technical Editor: R. Furness.
J. Manuf. Sci. Eng. Aug 2000, 122(3): 420-428 (9 pages)
Published Online: June 1, 1999
Article history
Received:
August 1, 1998
Revised:
June 1, 1999
Citation
Tsai, F., and Kannatey-Asibu, , E., Jr. (June 1, 1999). "Modeling of Conduction Mode Laser Welding Process For Feedback Control ." ASME. J. Manuf. Sci. Eng. August 2000; 122(3): 420–428. https://doi.org/10.1115/1.1285864
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