International Journal of Precision Engineering and Manufacturing

Korean Society for Precision Engineering (한국정밀공학회)
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Minimization of Welding Defect in $CO_2$ Laser Welded Tube

  • Published : 2005.07.01
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Abstract

To minimize the weld defect in manufacturing of the welded tube by using $CO_2$ laser, the monitoring of the welding quality and the seam tracking along the butt-joint lengthwise to the tube axis are studied. The longitudinal butt-joint is shaped from $60kgf/mm^2$ grade steel sheet by 2 roll bending method, and welded by the $CO_2$ laser welding system equipped with the seam tracker and plasma sensor. The laser welded tube has the thickness of 1.5mm, diameter of 105.4mm and length of 2000mm. The precise positioning of the laser beam on the butt-joint to be assembled is obtained within $200{\mu}m$ by the laser vision sensor. The artificial defects in the butt-joint are well observed by the signal of plasma intensity measured from the plasma sensor of UV wavelength range within 400nm. The developed $CO_2$ laser tube welding system has the function of the precision seam tracking and the real-time monitoring of the welding quality. In conclusion, the laser welded tube can be used for manufacturing of automobile chassis and components after hydro-forming.

Keywords

References

  1. Aubry, P., Coste, F., Fabbro, R., Frechett, D., '2D YAG Welding on Non-liner Trajectories with 3D Camera Seam Tracker Following for Automotive Applications,' Laser Appls. Auto Industry, Section F-ICALEO 2000, pp. 21-27, 2000
  2. Coste, F., Aubry, P., Fabbro, R., Dubois, T., 'A Rapid Seam Tracking Device for YAG and $CO_{2}$ High Speed Laser Welding,' Section F-ICALEO 1998, pp. 217-223, 1998
  3. Beyer, E. and Abels, P., 'Process Monitoring in Laser Materials Processing,' Laser Advanced Materials Processing(LAMP92), pp.433-438, 1992
  4. Matsunawa, A., Kim, J. D., Takemoto and Katayama, S., 'Spectroscopic Studies on Laser-Induced Plume of Aluminium Alloy,' ICALEO '95 Laser Institute of America 80, pp. 719-728, 1995
  5. Gatzweiler, W., Maischner, D., Beyer, E., 'On-line Plasma Diagnostics for Process-control inWelding with $CO_{2}$ Lasers,' SPIE, 1020, pp. 142-148, 1998
  6. Beersiek, J., Poprawe, R., Schulz, W., Gu, Hongping,Mueller, R. E. and Duley, W. W., 'On-line Monitoring of Penetration Depth in Laser Beam Welding,' ICALEO '96 Laser Institute of America, 1996
  7. Nam, G.J., Park, K.Y. and Lee, K.D., 'Study on the Characteristics of the Plasma Induced by Lap-joint $CO_{2}$ Laser Welding of Automotive Steel Sheets,' Journal of KSLP, Vol. 5, No. 1, pp. 33-42, 2002 (in Korean)
  8. Li, L., Steen, W. M., 'Non-Contact Acoustic mission Monitoring During Laser Processing,' ICALEO '92 Laser Institute of America, pp. 719-728, 1992
  9. Gu, H. and Duley, W. W., 'Resonant Acoustic Emission During LaserWelding of Metals,' J. of Phys. D : Appl. Phys., Vol. 29, pp. 550-555, 1996 https://doi.org/10.1088/0022-3727/29/3/010
  10. Ishide, T., Yokoyama, A., Nagura, Y.,Matsumoto, O., 'High Power YAG LaserWelding and Its In-Process Monitoring Using Optical Fibers,' Proc. ECLAT, pp. 183-192, 1994
  11. Watanabe, M., Okado, H., Inoue, T., Nakamura, S. and Matsunawa, A., 'Features of Various In-ProcessMonitoring Methods and Their Applications to Laser Welding,' ICALEO '95 Laser Institute of America 80, pp. 719-728, 1992
  12. Ono, M., Nakada, K. and Kosuge, S., 'An Investigation on $CO_{2}$ Laser-Induced Plasma,' Journal of JWS, Vol. 10, No. 2, pp. 239-245, 1992. (in Japanese)
  13. Maischner, D., Drenker, A., Seidel, B., Abels, P. and Beyer, E., 'Process Control During Laser Beam Welding,' Proceeding of ICALEO '91, pp. 150-155, 1991
  14. Farson, D., Hillsley, K., Sames, J. and Young, R., 'Frequency-time Characteristics of Air-borne Signals from LaserWelds,' Journal of Laser Applications, Vol. 8, No. 1, pp. 33-42, 1996
  15. Chang, Dale U., 'Real-time Laser Weld Quality Monitoring System,' ICALEO '95 Proceedings, pp. 1128-1137, 1995