Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

Acoustic Emission Monitoring during Laser Spot Welding of Stainless Steel Sheets

스테인레스 박강판의 레이저 점 용접 시 음향방출 실시간 모니터링

  • 이성환 (한양대학교 기계공학과) ;
  • 최정욱 (한양대학교 대학원 정밀기계공학과) ;
  • 최장은 (한양대학교 대학원 정밀기계공학과)
  • Published : 2005.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

Compared with conventional welding, laser spot welding offers a unique combination of high speed, precision and low heat distortion. This combination of advantages is attractive for manufacturing industries including automotive and electronics companies. In this paper, a real time monitoring scheme fur a pulsed Nd:YAG laser spot welding was suggested. Acoustic emission (AE) signals were collected during welding and analyzed for given process conditions such as laser power and pulse duration. A back propagation artificial neural network, with AE frequency content inputs, was used to predict the weldability of stainless steel sheets.

Keywords

References

  1. Ghoo, B. Y. and Keum, Y. T., 'Evaluation of Mechanical Properties of Welded Metal in Tailored Steel Sheet Welded by Co2 Laser,' J. of KSPE, Vol.18, No.4, pp.142-150, 2001
  2. Na, E. G., Yu, H. S. and Kim, H., 'Study on Characteristics of SCC and AE Signals for Weld HAZ of HT-60 Steel,' Journal of KSNT, Vol. 21, No.1, pp.62-68, 2001
  3. Lee, J. S. and Hong, J. W., 'Hot Cracking in Austenitic Stainless Steel Welds,' Journal of KWS, Vol.17, No.5, pp.10-19, 1999
  4. Bransch, H. N., Weckman, D. C. and Kerr, H. W., 'Effects of Pulse Shaping on Nd:YAG Spot Welds in Austenitic Stainless Steel,' Welding Journal, Vol. 73, No.6, pp. 141-151, 1994
  5. Ko, S. H., Lee, J. Y. and Yoo, C. D., 'Analysis of Keyhole Formation and Stability in Laser Spot Welding,' J. of DWS, Vol. 20, No. 4, pp. 484-490, 2002
  6. Furuta, H., 'Neural Network and Its Application to Structural Engineering,' Computational Structural Engineering, Vol. 9, No. 3, pp. 7-22, 1996
  7. Kang, H. A., Hong, S. J., Jun, T. O., Jang, W. S. and Na, S. J., 'A Study on the Prediction of Laser Spot Weld Shapes of Thin Stainless Steel Sheet,' Journal of KSPE, Vol. 15, No. 8, pp. 102-108, 1998
  8. Zhang, H., Senkara, J. and Wu, X., 'Suppressing Cracking in Resistance Welding AA5754 by Mechanical Means,' J. of Manf. Sci. and Eng., Vol. 124, No. 1, pp. 79-84, February, 2002 https://doi.org/10.1115/1.1418693
  9. Brooks, J. A., Robino, C. V., Headley, T. J. and Michael, J. R., 'Weld Solidification and Cracking Behavior of Free-machining Stainless Steel,' Supplement to the welding journal, pp. 51-64, 2003
  10. Liu, J. T., Weckman, D. C. and Kerr, H. W., 'The Effects of Process Variables on Pulsed Nd:YAG Laser Spot Welds,' part I, AISI 409 Stainless Steel, Metal. Trans. B, 24B (6), pp. 1065-1076, 1993 https://doi.org/10.1007/BF02660998
  11. Jon, M. C., 'Monitoring Laser Welds using Stress Wave Emission Techniques,' International advances on nondestructive testing, Vol. 7, pp. 351-369, 1984
  12. von Almen., M. and Blatter., A., Laser -Beam Interactions with Materials - Physical principles and applications, Springer, 1995
  13. Lim, T. G., Cho, H. S., 'The use of Artificial Neural Network in the Monitoring of Spot Weld Quality,' J. of KWS, Vol.11, No.2, pp. 27-41, 1993