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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 19 — Jul. 1, 2005
  • pp: 3869–3876

Optical techniques for real-time penetration monitoring for laser welding

Fabrice Bardin, Adolfo Cobo, Jose M. Lopez-Higuera, Olivier Collin, Pascal Aubry, Thierry Dubois, Mats Högström, Per Nylen, Peter Jonsson, Julian D. C. Jones, and Duncan P. Hand  »View Author Affiliations


Applied Optics, Vol. 44, Issue 19, pp. 3869-3876 (2005)
http://dx.doi.org/10.1364/AO.44.003869


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Abstract

Optical techniques for real-time full-penetration monitoring for Nd:YAG laser welding have been investigated. Coaxial light emission from the keyhole is imaged onto three photodiodes and a camera. We describe the spectral and statistical analyses from photodiode signals, which indicate the presence of a full penetration. Two image processing techniques based on the keyhole shape recognition and the keyhole image intensity profile along the welding path are presented. An intensity ratio parameter is used to determine the extent of opening at the rear of a fully opened keyhole. We show that this parameter clearly interprets a hole in formation or a lack of penetration when welding is performed on workpieces with variable thicknesses at constant laser power.

© 2005 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(100.2960) Image processing : Image analysis
(140.3390) Lasers and laser optics : Laser materials processing

History
Original Manuscript: July 20, 2004
Revised Manuscript: January 18, 2005
Manuscript Accepted: February 11, 2005
Published: July 1, 2005

Citation
Fabrice Bardin, Adolfo Cobo, Jose M. Lopez-Higuera, Olivier Collin, Pascal Aubry, Thierry Dubois, Mats Högström, Per Nylen, Peter Jonsson, Julian D. C. Jones, and Duncan P. Hand, "Optical techniques for real-time penetration monitoring for laser welding," Appl. Opt. 44, 3869-3876 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-19-3869


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References

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