Acoustic and Optical Monitoring of High-Power CO2 Laser Cutting

Abstract:

Article Preview

In this paper, the development of a monitoring system for high-power CO2 laser cutting of thick steel plates (>15 mm) is reported. The aim of this system is to increase the robustness and autonomy of the laser cutting process of thick plates, which is still characterized by more narrow process windows compared to cutting of thin sheets. The applicability for monitoring purposes of two types of sensors is investigated: the acoustic microphone and the photodiode. For both types, correlation between the sensor output and the cut quality is investigated. Both contour cutting and piercing are covered in the study. The full penetration of the piercing can be monitored by both sensors. Furthermore quantitative relations between cut quality parameters and photodiode signal parameters could be determined: the mean level of the photodiode signal correlates well with the drag of the striations and dross formation, whereas the standard deviation proves to correlate well with the occurrence of burning defects and the cut edge roughness.

Info:

Periodical:

Main Theme:

Edited by:

F. Micari, M. Geiger, J. Duflou, B. Shirvani, R. Clarke, R. Di Lorenzo and L. Fratini

Pages:

161-168

Citation:

J. De Keuster et al., "Acoustic and Optical Monitoring of High-Power CO2 Laser Cutting", Key Engineering Materials, Vol. 344, pp. 161-168, 2007

Online since:

July 2007

Export:

Price:

$38.00

[1] R.J. Hull, M.L. Lander and J.J. Eric: Experiments in laser cutting of thick steel sections using a 100kW CO2 laser [for salvage industry]. Proceedings of the ICALEO'00 Vol. 89 (2000), pp.78-86.

[2] W. O'Neill and J.T. Gabzdyl: New developments in laser-assisted oxygen cutting. Optics and Laser Technology Vol. 34 (2000), pp.355-367.

[3] J.R. Duflou, J. -P. Kruth, J. De Keuster, K.Y. Sastry and R.F. de Graaf: On CO2 Laser Cutting of Thick Steel Plates. Proceedings of the SheMet International Conference 2003, pp.141-150.

[4] J. Meijer, S. Postma and G.R.B. E Romer: Optical Sensors for Penetration Control in Nd: YAG Laser Welding. Proceedings of the LANE 2001, pp.75-86.

[5] H. Tönshoff, A. Ostendorf, O. Hillers and V. Kral: Strategies for the quality inspection of laser welding processes based on a multiple sensor system. Proceedings of the LANE 2001, pp.675-686.

[6] M. Negendanck and J. Schwab: Process Monitoring in Laser Beam Welding. Proceedings of the LANE 2001, pp.697-706.

[7] P. Sheng and G. Chryssolouris: Investigation of acoustic sensing for laser machining processes, part 2: Laser grooving and cutting. Journal of Materials Processing Technology Vol. 43 (1994), pp.145-163.

DOI: https://doi.org/10.1016/0924-0136(94)90018-3

[8] H. Jorgensen: Investigations of On-line Process Monitoring and Control in CO2 laser cutting. (PhD dissertation, Technical University of Denmark, 1990).

[9] D. Leidinger: In-Process Monitoring during CO2 Laser Cutting. Lasers in Engineering Vol. 4 (1995), pp.243-254.

[10] M.Y. Huang and C.R. Chatwin: A knowledge-Based Adaptive Control Environment for an Industrial Laser Cutting System. Optics and Lasers in Engineering Vol. 21 (1994), pp.273-295.

DOI: https://doi.org/10.1016/0143-8166(94)90048-5

[11] H. Haferkamp, F. von Alvensleben, A. von Busse, M. Goede and O. Thurk: Thermographic system for process monitoring of laser beam cutting. Proc. SheMet '00 (2000), pp.261-270.

Fetching data from Crossref.
This may take some time to load.