Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on Correlationship between the Induced Plasma and Emission Signals for In-process Monitoring in Stainless Steel Welding of Fiber Laser (I) - Properties Changes of the Measured Signals in a Thin Plate Welding -

파이버 레이저의 스테인리스강 용접시 인프로세스 모니터링을 위한 유기 플라즈마와 방사신호간의 상관성 연구(I) - 박판 용접시 측정신호의 특성 변화 -

  • Lee, Chang-Je (R&D Institute, BEST F.A Co., Ltd.) ;
  • Kim, Jong-Do (Division of Marine Engineering, Korea maritime and Ocean University)
  • 이창제 (베스트에프에이(주) 기술연구소) ;
  • 김종도 (한국해양대학교 해사대학 기관공학부)
  • Received : 2014.11.20
  • Accepted : 2014.12.26
  • Published : 2014.12.31
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Abstract

The applications by using fiber laser have increased recently. However, due to high beam quality of fiber laser, it is inappropriate to apply the existing laser welding monitoring technology to the fiber laser welding as it is. On this study, thus, we analyzed emission signal with RMS and FFT for the in-process monitoring during fiber laser welding. 12mm-thick 304L stainless steel sheet was used in fiber laser welding and the result showed as follows: The intensity changes in RMS did not clarify the distinction between full penetration and partial penetration. However, as welding speed increases, specific frequency also increases in regards of frequency analysis by using FFT.

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References

  1. S. Katayama, Y. Kawahito, K. Kinoshita, N. Matsumoto and M. Mizutani : Weld Penetration and Phenomena in 10 KW Fiber Laser Welding, ICALEO 2007, (2007), 353-359
  2. H. Nagaqyama, M. Mizutani, Y. Kawahito and S. Katayama : Weld Penetration and Welding Phenomena of Aluminum Alloy with High-Power Fiber Laser, ICALEO 2007 (2007), 916-924
  3. S. Katayama and Y. Kawahito : Characteristic Penetration and Phenomena during Welding with High Power Fiber Laser, The welding review, 55-11 (2007), 86-92 (in Japanese)
  4. Y. Kawahito, S. Oiwa, M. Mizutani and S. Katayama : Effects of Laser-Induced Plume in High-Power Fiber Laser Welding with Long-Focal-Distance Focusing Optics, Quarterly journal of the Japan Welding Society, 29-1 (2011), 18-23 (in Japanese) https://doi.org/10.2207/qjjws.29.18
  5. Kawahito Yousuke et al. : Interaction between Laser Beam and Plasma/Plume Induced in Welding of Stainless Steel with Ultra-High Power Density Fiber Laser, Quarterly journal of the Japan Welding Society, 25-3 (2007), 461-467 (in Japanese) https://doi.org/10.2207/qjjws.25.461
  6. Kawahito Yousuke et al. : High-Speed Observation and Spectroscopic Analysis of Laser-Induced Plume in High -Power Fiber Laser Welding of Stainless Steel, Quarterly journal of the Japan Welding Society, 25-3 (2007), 455-460 (in Japanese) https://doi.org/10.2207/qjjws.25.455
  7. C. J. Lee, J. D. kim and Y. C. Kim : Characteristics of Plasma Emission Signals in Fiber Laser Welding of API Steel (II), Journal of KWJS, 30-4 (2012), 314-320 (in Korean)
  8. C. J. Lee, J. D. kim and Y. C. Kim : Characteristics of Plasma Emission Signals in Fiber Laser Welding of API Steel (III), Journal of KWJS, 31-3 (2013), 60-65 (in Korean) https://doi.org/10.5781/KWJS.2013.31.3.60
  9. C. J. Lee, J. D. kim and J. Suh : Characteristics of Plasma Emission Signals in Fiber Laser Welding of API Steel (IV), Journal of KWJS, 31-4 (2013), 28-33 (in Korean) https://doi.org/10.5781/KWJS.2013.31.4.28