Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristics of Plasma Emission Signals in Fiber Laser Welding for API Steel (I) - Variation of Signals by Measuring Conditions -

API강재의 화이버레이저 용접시 유기하는 플라즈마의 방사특성 (I) - 측정조건에 따른 광신호의 변화 -

  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 이창제 (한국해양대학교 대학원) ;
  • 이목영 (RIST 원천소재연구본부)
  • Received : 2010.04.28
  • Accepted : 2001.09.14
  • Published : 2010.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Fiber laser is a heat source which is introduced recently, and so has a little researched data compare with conventional laser processing. Moreover basic data for welding monitoring are also insufficient. Therefore, in this study, the change of signal with measuring position and angle of plasma emission signals were analysed as a basic experiment for real time monitoring in fiber laser welding. As a result, the signals measured from the side, front and rear had the biggest intensity at $60^{\circ}$, and frequency peak to reflect the behavior of keyhole and swing of plasma by shield gas was detected at $45{\sim}60^{\circ}$. However, both intensity of signal and the result of FFT for monitoring were satisfied at the angle of $45^{\circ}$ from the side.

Keywords

References

  1. J.D. Kim and Y.S Kim : The State of In-Process Quality Monitoring Technology in Laser Welding, Journal of KWJS, 18-4 (2000), 433-440 (in Korean)
  2. William M. Steen : Laser Material Processing, Springer, 3rd Edition, 351-382
  3. H.B.Chen, L.Li, D.J. Brookfield, K. William and W.M. Steen : Laser Process Monitoring with Dual Wavelength Optical Sensors, ICALEO'91, 113-122
  4. E. Beyer, A. Gasser, W. Gatzweiler and W. Sokolowski : Plasma fluctuations in laser welding with CW-$CO_{2}$ lasers, Proc. ICALEO'87, 17-23
  5. W. Sokolowski, G. Herziger and E. Beyer : Spectral Plasma Diagnostics in Welding with $CO_{2}$ Lasers, High Power $CO_{2}$ Laser Systems and Applications, SPIE, 1020 (1988), 96-102
  6. W. Gatzweiler, D. Maischner and E. Beyer : On-line plasma diagnostics for process-control in welding with $CO_{2}$ lasers, High Power $CO_{2}$ Laser Systems and Applications, SPIE 1020 (1988), 142-148
  7. W. Gatzwiler, D. Maischner, F. J. Faber, C. Derichs and E. Beyer : Model of Dynamic Behaviour in Laser Beam Welding, High Power Lasers and Laser Machining Technology, SPIE 1132 (1989), 157-165
  8. L. Li and W.M. Steen : Non-contact Acoustic Emission Monitoring During Laser Processing, ICALEO'92, SPIE 1990, 719-728
  9. L. Li, W.M. Steen, K. Shi and D.J. Brookfield : Sensor Development for In-process Quality Inspection and Optimization of High Speed Laser Can Welding Process, Proc. LAMP'92, 415-420
  10. L. Li : A comparative of ultrasound emission characteristics in laser processing, Applied Surface Science, 186 (2002), 604-610 https://doi.org/10.1016/S0169-4332(01)00695-X

Cited by

  1. Characteristics of Plasma Emission Signals in Fiber Laser Welding of API Steel (III) -The Effect on Plasma Emission Signals by Shield Gas- vol.31, pp.3, 2013, https://doi.org/10.5781/KWJS.2013.31.3.60