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Proceedings Paper

Possible diagnostic signal for monitoring CO2 laser welding of aluminum alloy sheets
Author(s): Hongping Gu; Walter W. Duley
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Paper Abstract

In an effort to look for a diagnostic signals for in-line monitoring during laser welding of aluminum alloy, a pyroelectric detector was used to record the reflected laser radiation from the weld pool when a CO2 laser welds aluminum alloy sheets. The signals were processed with a fast-Fourier transform (FFT). From the FFT spectrum strong components of the reflected laser radiation in the low frequency range were found to be a strong function of laser welding variables. When the laser intensity is kept constant, a minimum signal is found at a particular welding speed. At speeds of either slower or faster than that particular speed, the signals increase up to a factor of 3 or more. No corresponding components were noticed in the photodiode signals. Analysis of the weldments indicates that optimum welding is produced around this specific speed.

Paper Details

Date Published: 3 March 1995
PDF: 7 pages
Proc. SPIE 2374, Novel Applications of Lasers and Pulsed Power, (3 March 1995); doi: 10.1117/12.205009
Show Author Affiliations
Hongping Gu, Univ. of Waterloo (Canada)
Walter W. Duley, Univ. of Waterloo (Canada)

Published in SPIE Proceedings Vol. 2374:
Novel Applications of Lasers and Pulsed Power
Michael W. Prairie; Randy D. Curry, Editor(s)

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