한국레이저가공학회지 (Laser Solutions)

한국레이저가공학회 (Korean Society of Laser Processing)
권호 표지

비집속빔을 이용한 $CO_2$ 레이저 빔 조사강화

$CO_2$ Laser Irradiation Strengthening by Defocused Beam

  • 서정 (한국기계연구원 레이저응용시스템그룹) ;
  • 이제훈 (한국기계연구원 레이저응용시스템그룹) ;
  • 강희신 (한국기계연구원 레이저응용시스템그룹) ;
  • 김정오 (한국기계연구원 레이저응용시스템그룹) ;
  • 이문용 ((주)성우하이텍 기술연구소) ;
  • 오상진 ((주)성우하이텍 기술연구소) ;
  • 이규현 ((주)성우하이텍 기술연구소)
  • Seo, Jung (Laser Application group, Korea Institute of Machinery & Materials) ;
  • Lee, Je-Hoon (Laser Application group, Korea Institute of Machinery & Materials) ;
  • Kang, Hee-Sin (Laser Application group, Korea Institute of Machinery & Materials) ;
  • Kim, Jung-Oh (Laser Application group, Korea Institute of Machinery & Materials) ;
  • Lee, Moon-Yong (Technical Institute, Sungwoo Hitech Co., Ltd.) ;
  • Oh, Sang-Jin (Technical Institute, Sungwoo Hitech Co., Ltd.) ;
  • Lee, Kyu-Hyun (Technical Institute, Sungwoo Hitech Co., Ltd.)
  • 발행 : 2003.08.01
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초록

Defocused CO$_2$ laser beam irradiation strengthening of 60kgf/$\textrm{mm}^2$ grade steel sheet was investigated to obtain the tensile strength similar to that of fully penetrated one by the focused beam. The melted line width by the defocused beam was 3∼4 times larger compared to that of the focused beam. However, the increase of tensile strength with 1 line irradiation by the defocused beam was similar to that of 2~3 lines by the focused beam. The increase(37.6%) of bending strength with 1 line by the defocused beam was higher than the increase(12.9%) of tensile strength. Also, the effect of cooling gas to strengthening was observed.

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