Journal of Welding and Joining

  • 제20권4호
  • /
  • Pages.484-490
  • /
  • 2002
  • /
  • 2466-2232(pISSN)
  • /
  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
권호 표지

레이저 점 용접의 키홀 발생과 안정성에 대한 해석

Analysis of Keyhole Formation and Stability in Laser Spot Welding

  • 고성훈 (현대중공업 산업기술연구소) ;
  • 이재영 (한국과학기술원 기계공학과) ;
  • 유중돈 (한국과학기술원 기계공학과)
  • 발행 : 2002.08.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The formation and stability of stationary laser weld keyholes were investigated using a numerical simulation. The effect of multiple reflections in the keyhole was estimated using the ray tracing method, and the free surface profile, flow velocity and temperature distribution were calculated numerically. In the simulation, the keyhole was formed by the displacement of the melt induced by evaporation recoil pressure, while surface tension and hydrostatic pressure opposed cavity formation. A transition mode having the geometry of the conduction mode with keyhole formation occurred between the conduction and keyhole modes. At laser powers of 500W and greater, the protrusion occurred on the keyhole wall, which resulted in keyhole collapse and void formation at the bottom. Initiation of the protrusion was caused mainly by collision of upward and downward flows due to the pressure components, and Marangoni flow had minor effects on the flow patterns and keyhole stability.bility.

키워드

참고문헌

  1. 대한용접학회 용접 · 접합(편람)
  2. Laser welding W.W. Duley
  3. J. Phys. D: Appl. Phys. v.22 An analysis of the laser-plasma interaction in laser keyhole welding J. Dowden;P. Kapadia;N. Postacioglu https://doi.org/10.1088/0022-3727/22/6/004
  4. J. Phys. D: Appl. Phys. v.27 A model of deep penetration laser welding based on calculation of the keyhole profile A. Kaplan https://doi.org/10.1088/0022-3727/27/9/002
  5. J. Phys. D: Appl. Phys. v.26 Towards a self-consistent model of the keyhole in penetration laser beam welding J. Kroos;U. Gratzke;G. Simon https://doi.org/10.1088/0022-3727/26/3/021
  6. J. Phys. D: Appl. Phys. v.27 Oscillations of the Keyhole in penetration laser beam welding T. Klein;M. Vicanek;J. Kroos;I. Decker;G. Simon https://doi.org/10.1088/0022-3727/27/10/006
  7. J. Phys. D: Appl. Phys. v.30 The role of recoil pressure in energy balance during laser materials processing V. Semak;A. Matsunawa https://doi.org/10.1088/0022-3727/30/18/008
  8. J. Phys. D: Appl. Phys. v.34 Modeling of high-density laser-material interaction using fast level set method H. Ki;P.S. Mohanty;J. Mazumder https://doi.org/10.1088/0022-3727/34/3/320
  9. Welding J. v.78 Modeling and analysis of laser melting within a narrow groove welding J.O. Milewski;M.B. Barbe
  10. J. Phys. D: Appl. Phys. v.30 A mathematical model for penetration laser welding as a free-boundary problem P. Solana;J.L. Ocana https://doi.org/10.1088/0022-3727/30/9/005
  11. J. Phys. D: Appl. Phys. v.33 Kinetic description of keyhole plasma in laser welding U. Dilthey https://doi.org/10.1088/0022-3727/33/21/312
  12. J. Phys. D: Appl. Phys. v.30 A study of the effect of multiple reflections on the shape of the keyhole in the laser processing of materials P. Solana;G. Negro https://doi.org/10.1088/0022-3727/30/23/006
  13. Laser-beam interactions with materials M. von Allmen;M. Blatter
  14. J. of Computational Phys. v.39 Volume of fluid method for the dynamics of free boundaries C.W. Hirt;B.D. Nichols https://doi.org/10.1016/0021-9991(81)90145-5
  15. J. of KWS v.17 no.6 Effects of surface depression on pool convection and oscillation in GTAW S.H. Ko;S.K. Choi;C.D. Yoo
  16. Proc. ICALEO' 01 Laser weld keyhole dynamics M. Cho;D. Farson
  17. Welding Int. v.15 Pore formation during continuous wave Nd:YAG laser welding of aluminium for automotive applications M. Pastor;H. Zhao;T. Debroy https://doi.org/10.1080/09507110109549355
  18. Welding J. v.57 Prediction of electron beam welding spiking tendency D.A. Schauer;W.H. Giedt