Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Characteristics of Plasma Emission Signals with Welding Conditions in CO2 Laser

CO2 레이저용접시 용접조건에 따른 플라즈마 방사신호의 특성연구

  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 이창제 (한국해양대학교 대학원)
  • Published : 2009.11.01
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Abstract

Today, implementation of the defect detection in laser welding has been researched for a long time, but most studies have been made around thin plate within $1{\sim}3mm^t$. Therefore, this study was measured and analyzed light emission signals of the induced plasma in $CO_2$ laser lap welding of $6mm^t$ Zn primer-coated steel, and based on this analysis, research made an investigation into possibility of monitoring in thick plate welding. It was been analyzing the measured signals by RMS and FFT processing, as a results, we were able to confirm definite difference of two signals between humping bead and sound bead. Thus, possibility of real time monitoring in $CO_2$ laser lap welding verified experimentally.

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References

  1. Beyer, E., Gasser, A., Gatzweiler, W. and Sokolowski, W., 1987, 'Plasma Fluctuations in Laser Welding with cw-$CO_{2}$ Lasers,' Proc. ICALEO '87, pp.17-23
  2. Sokolowski, W., Herziger, G. and Beyer, E., 1988, 'Spectral Plasma Diagnostics in Welding with $CO_{2}$ Lasers,' High Power $CO_{2}$ Laser Systems and Applications, SPIE Vol.1020, pp.96-102
  3. Gatzweiler, W., Maischner, D. and Beyer, E., 1988, 'On-line Plasma Diagnostics for Process-Control in Welding with $CO_{2}$ Lasers,' High Power $CO_{2}$ Laser Systems and Applications, SPIE Vol.1020, pp.142-148
  4. Gatzwiler, W., Maischner, D., Faber, F. J., Derichs, C. and Beyer, E., 1989, 'Model of Dynamic Behaviour in Laser Beam Welding,' High Power Lasers and Laser Machining Technology, SPIE Vol.1132, pp.157-165
  5. Li, L. and Steen, W.M., 1992, 'Non-contact Acoustic Emission Monitoring During Laser Processing,' ICALEO '92, SPIE Vol.1990, pp.719-728
  6. Li, L., Steen, W.M., Shi, K. and Brookfield, D.J., 1992, 'Sensor Development for In-process Quality Inspection and Optimization of High Speed Laser Can Welding Process,' Proc. LAMP '92, pp.415-420
  7. Li, L., 2002, 'A Comparative of Ultrasound Emission Characteristics in Laser Processing,' Applied Surface Science, Vol.186, pp.604-610 https://doi.org/10.1016/S0169-4332(01)00695-X
  8. Park, H.J., Kim, J.D. and Kim, Y.S., 2003, 'The Weldability of Primer-coated Steel for Shipbuilding by $CO_{2}$ Laser,' Proc. KSME Spring, pp.316-321
  9. Kim, J.D. and Kim, Y.S., 2000, 'The State of In-Process Quality Monitoring Technology in Laser Welding,' Journal of KWJS, Vol.18, No.4, pp.433-440
  10. Ready, John F., 2001, 'LIA Handbook of Laser Materials Processing,' Laser Institude of America, pp.361-379
  11. Kim, J.D. and Park, H.J., 2005, 'The Weldability of $6mm^{t}$ Primer-coated Steel for Shipbuilding by $CO_{2}$ Laser(I),' Journal of KWJS, Vol.23, No.3, pp.288-294

Cited by

  1. Weld Process Monitoring Technology in Laser Welding vol.30, pp.1, 2012, https://doi.org/10.5781/KWJS.2012.30.1.27
  2. Laser Welding of Zn-Coated Steel vol.34, pp.10, 2010, https://doi.org/10.3795/KSME-A.2010.34.10.1507