Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Laser Welding Quality Monitoring with an Optical Fiber System

  • Kim, Jin-Tae (Dept. of Photonic Eng., College of Eng., Chosun University) ;
  • Kim, Do-Hyoung (Dept. of Applied Photonic Eng., Grad. Sch., Chosun University) ;
  • Chung, Chin-Man (Lab. for Quantum Optics, Korea Atomic Energy Research Institute) ;
  • Baik, Sung-Hoon (Lab. for Quantum Optics, Korea Atomic Energy Research Institute) ;
  • Park, Seung-Kyu (Lab. for Quantum Optics, Korea Atomic Energy Research Institute) ;
  • Kim, Min-Suk (Lab. for Quantum Optics, Korea Atomic Energy Research Institute)
  • Received : 2003.03.25
  • Published : 2003.09.01
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Abstract

We have developed a laser welding monitoring system to monitor laser welding process conditions such as sample feed rate, laser focal position, and laser power. A 2 ㎾ Nd:YAG CW laser beam has been applied to the welding of a stainless steel plate (SUS306) to investigate the welding monitoring. Theradiation signal from the weld pool was guided back through the focusing optics and the laser delivery fiber, and measured by a photo detector. By changing the focus of the laser beam along the z-direction, the penetration depth of the welding material has been measured. That shows the penetration depth depends on the frequency fluctuations of the plume signals which can be used in welding quality control.

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References

  1. S. Postma, R. Aarts, J. Meijer, B. Jonker, and W. M. Zweers, “Penetration control in laser welding of sheet metal using optical sensors,” in Laser Material Processing, X. Chen, Ed., Proc. ICALEO, vol. 81e, pp. 1083-1092, 2001.
  2. M. Watanabe, H. Okado, and T. Inoue, “Features of various in-process monitoring methods and their applications to laser welding,” in Laser Material Processing, D. Farson, Ed., Proc. ICALEO, vol. 80e, pp. 553-558, 1995.
  3. J. Beersiek, R. Poprawe, W. Schulz, H. Gu, and W. W. Duley, “On-line monitoring of penetration depth in laser beam welding,” in Laser Material Processing, R. Fabbro, Ed., Proc. ICALEO, vol. 83e, pp. 30-35, 1997.
  4. H. K. Tonshoff, L. Overmeyer, and J. Schumacher, “Process and quality control for automotive laser welding applications,” in Laser Material Processing, D. Farson, Ed., Proc. ICALEO, vol. 80e, pp. 45-55, 1996.
  5. H. K. Tonshoff, L. Overmeyer, and F. V. Alvensleben, “Closed-loop control of material processing with high power CO2 lasers,” in Beam Control, Diagnostics, Standards, and Propagation, L. W. Austin, Ed., Proc. SPIE, vol. 2375, pp. 109-117, 1995. https://doi.org/10.1117/12.206976
  6. H. K. Tonshoff, A. Ostendorf, R. G uttler, and W. Specker, “Online monitoring and closed-loop control of laser welding processes,” VDI Berichte Nr. vol. 1405, pp. 603-612, 1998.
  7. C. -J. Kim, S. -H. Baik, M. -S. Kim, C. -M. Chung, and K. -J. Kim, “Auto-focus control by chromatic filtering in laser welding,” J. Opt. Soc. Korea, vol. 4, no. 2, pp. 94-100, 2000. https://doi.org/10.3807/JOSK.2000.4.2.094
  8. 4D GmbH, “WeldWatcher operating instructions”, ver. 2.41, pp. 2-11, 2000.
  9. I. Miyamoto, E. Ohmura, and T. Maede, “Dynamic behavior of plume and keyhole in CO2 laser welding, ” in Laser Material Processing, M. Beck, Ed., Proc. ICALEO, vol. 83e, pp. 210-218, 1997.

Cited by

  1. Quality assessment in laser welding: a critical review vol.94, pp.5-8, 2018, https://doi.org/10.1007/s00170-017-0461-4