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Method for Measuring Weld Temperature Using an Infrared Thermal Imaging Camera

적외선 열화상 카메라를 이용한 용접부의 온도 측정 방법

  • 노찬승 (조선이공대학교 선박해양.기계과) ;
  • 김경석 (조선대학교 기계설계공학과) ;
  • 장호섭 (조선대학교 레이저응용 국제공동연구센터)
  • Received : 2014.06.12
  • Accepted : 2014.08.07
  • Published : 2014.08.30

Abstract

In this paper, a method is tested to measure temperatures in high-temperature welds. Protective glass was installed between an infrared thermal imaging camera and a heat source, and temperature compensation was applied to the measuring instruments. When the temperature of halogen lamps was taken in real-time and measured by the thermal camera, the temperature was found to be almost invariant with the distance between the camera and heat source. The temperature range could be predicted, through correlations with the thickness of the protective glass and the measured distance. This study suggests that the temperature measurement of welds obtained by using an infrared thermal imaging camera is valid, through experimental testing of heat sources.

본 연구에서는 적외선 열화상 카메라와 열원 사이에 유리를 설치하여 측정기기의 보호 및 온도 보정을 통하여 고온의 용접부 온도를 실시간으로 측정하고자 하였다. 먼저 할로겐램프의 열에 대한 온도 차이를 실시간으로 촬영하고 온도를 측정한 결과, 카메라와 열원 사이의 거리별 온도는 거의 동일하게 측정되었음을 확인할 수 있었고, 유리 두께와 측정 거리의 상관관계를 통하여 온도 범위를 예측할 수 있다는 것을 알 수 있었다. 이를 바탕으로 용접열원에 대한 실험을 수행하여 열화상 카메라를 이용한 용접부의 온도 측정의 타당성을 제시하였다.

Keywords

References

  1. J. F. Lancaster, "Metallurgy of Welding," 3rd Edition, Woodhead Publishing Limited, (1980)
  2. "Welding & Joining Handbook," The Korean Welding and Joining Society, Vol. 2, pp. 6-49 (2008)
  3. H. S. Bang, C. I. Oh, C. S. Ro, C. S. Park and H. S. Bang, "Analysis of thermal and welding residual stress for hybrid welded joint by finite element method," Journal of KWJS, Vol. 25, No. 6, pp. 11-16 (2007) https://doi.org/10.5781/KWJS.2007.25.6.011
  4. K. Masubuchi, "Analysis of Welded Structures-Residual Stresses, Distortion, and Their Consequences," Pergamon Press, Oxford, (1980)
  5. P. Michaleris and A. DeBiccari, "Prediction of welding distortion," Welding Journal, Vol. 76, No. 4, pp. 172-179 (1997)
  6. V. Madjarova, S. Toyooka, R. Widiastuti and H. Kaadono, "Dynamic ESPI with subtraction-addition method for obtaining the phase," Optics Communications, Vol. 212, pp. 35-43 (2002) https://doi.org/10.1016/S0030-4018(02)01909-0
  7. K. S. Kim, D. S. Kim, H. C, Jung, K. S. Kim, S. Y. Jeon and D. P. Hong, "Deformation and detection frequency according to nuclear power pipe thickness by ESPI and infrared camera," J. Korean Soc. Nondestruc. Test., pp. 478-483 (2010)
  8. K. S. Kim, H. M. Kim, H. S, Chang and S. P. Yang, "Thermal deformation measurement spherical glasses lens using ESPI," J. Korean Soc. Nondestruc. Test., Vol 28, No. 2, pp. 137-143 (2008)