Modeling of Conduction Mode Laser Welding Process For Feedback Control

[+] Author and Article Information
Fuu-Ren Tsai, Elijah Kannatey-Asibu

Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, MI 48109-2125

J. Manuf. Sci. Eng 122(3), 420-428 (Jun 01, 1999) (9 pages) doi:10.1115/1.1285864 History: Received August 01, 1998; Revised June 01, 1999
Copyright © 2000 by ASME
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Illustration of the open-loop laser welding system
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Schematic of the tear-drop cylinder shape weld pool
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Weld pool image of Case 1. Thin plate (3.175 mm) was laser welded at 5 mm/sec and 700 W.
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Boundary points of weld pool in Fig. 3 after image processing
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Actual dimensions of the weld pool after conversion
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Fitting the weld pool boundary with an approximate tear-drop shape
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Measured weld pool length for Case 1. Solid line—original data; dotted line—after fitting data with an elliptical shape; dashed line—after fitting data with a tear-drop shape. (Solid line and dashed line coincide.)
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Measured weld pool width for Case 1. Solid line—original data; dotted line—after fitting data with an elliptical shape; dashed line—after fitting data with a tear-drop shape.
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Comparison of experimental and simulation results of weld pool response. Solid line—experimental; dotted line—elliptical model simulation; dashed line—tear-drop simulation.
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Comparison of experimental and first-order model of weld pool width obtained by the least squares method. Solid line—experimental; dashed line—simulation result of the least squares first-order model.
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Input-output signals of the laser machine
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First-order model of the laser machine obtained by the least squares method. Solid—line real power output signal of laser machine; dotted line—simulation result of first-order model.



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