한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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엔탈피 모델을 이용한 레이저 용융풀 형상에 대한 수치해석연구

NUMERICAL SIMULATION OF LASER WELD POOL GEOMETRY USING ENTHALPY METHOD

  • 이태봉 (홍익대학교 일반대학원 기계공학과) ;
  • 정하승 (홍익대학교 기계.시스템 디자인 공학과) ;
  • 신승원 (홍익대학교 기계.시스템 디자인 공학과)
  • Lee, T. (Graduated School of Mechanical Engineering, Hongik Univ.) ;
  • Cheung, H. (Dept. of Mechanical System Design Engineering, Hongik Univ.) ;
  • Shin, S. (Dept. of Mechanical System Design Engineering, Hongik Univ.)
  • 투고 : 2013.11.21
  • 심사 : 2013.12.24
  • 발행 : 2013.12.31
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초록

Laser welding is widely used in the industry for the advantage of small heat affected zone and short weld process time. Conduction limit welding can be used to modify the surface characteristic and it is important to identify the heat affecting area correctly for the improvement of manufacturing accuracy. Since time and length scale associated with laser welding process are extremely small, numerical study can be a useful tool. In this study, two-dimensional axi-symmetric version of energy equation with enthalpy method has been used to analyze the effect of laser input conditions on final shape by the laser welding process. The proposed numerical procedure has been benchmarked with several experimental results and compared well. The modified Marangoni and Peclet number have been introduced using controllable input variables. Simple parametric researches have been performed for high Pr number material. The results show that higher Marangoni number increase fluid mixing, thus generating convex type weld pool. On the other hand, the width of the weld pool is proportional to Peclet number.

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참고문헌

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