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Proceedings Paper

Experimental study of the relationship between in-process signals and cut quality in gas-assisted laser cutting
Author(s): H. Y. Zheng; D. J. Brookfield; William M. Steen
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Paper Abstract

The patented "Acoustic Mirro?' has previously been used to investigate weld quality in laser welding. A good correlation was observed between the acoustic signal and weld quality. This success led the authors to investigate the use of the acoustic mirror in gas assisted laser cutting. A piezoelectric transducer mounted on the rear of the final mirror of the beam path was used to observe high frequency vibration due to reflected energy from the cutting process. Off-line inspection of the cut samples enabled the determination of cut quality. A correlation was obtained between the RMS value of the acoustic signal and full penetration of the laser beam, a decrease in signal corresponding to penetrating. Dross adhesion was also indicated by an increase in the level. Changes in the low frequency modulation showed some correlation to cut quality. Guidelines for the use of the acoustic signal as an indicator of fault cutting are discussed.

Paper Details

Date Published: 1 October 1990
PDF: 13 pages
Proc. SPIE 1276, CO2 Lasers and Applications II, (1 October 1990); doi: 10.1117/12.20547
Show Author Affiliations
H. Y. Zheng, Univ. of Liverpool (United Kingdom)
D. J. Brookfield, Univ. of Liverpool (United Kingdom)
William M. Steen, Univ. of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 1276:
CO2 Lasers and Applications II
Hans Opower, Editor(s)

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