DOI QR코드

DOI QR Code

Al 5J32 합금의 레이저 용접에서 레이저출력 모듈레이션을 이용한 이면 험핑 비드의 안정화

Prevention of Back Side Humping in Laser Welding of Al 5J32 Alloy by Using Laser Power Modulation

  • 안도창 (LG화학 중대형전지 활성화생산파트) ;
  • 김철희 (한국생산기술연구원 용접.접합연구그룹) ;
  • 김재도 (인하대학교 기계공학부)
  • 투고 : 2011.07.04
  • 심사 : 2011.08.22
  • 발행 : 2011.08.31

초록

In the 5xxx series Al-Mg alloy, magnesium addition can increase the strength of aluminum alloy by solid solution strengthening but it has a relatively low melting and boiling temperature. During full -penetration laser welding of the Al-Mg alloys, its low boiling point and high vapor pressure brings about the spiky humping bead on the bottom side. Under back-side shielding, the spiking of back bead can be reduced but it restraints the process flexibility. In this study, a square pulse waveform modulation was employed to stabilize keyhole and back bead surface without back-side shielding. By using an experimental design, the bead shapes were evaluated for various process parameters such as the focal position, welding velocity and waveform parameters and the smooth back bead shape could be achieved.

키워드

참고문헌

  1. Welding and Joining Handbook, Vol. 1, Korean Welding and Joining Society, 2008, 305-317 (in Korean)
  2. R. A. Woods : Metal Transfer in Aluminum Alloys, Welding Journal, 59-2 (1980), 59-s-66-s
  3. C. Kim, Y.-N. Ahn, J.-K. Choi and S. Rhree : Process Evaluation of Plasma-GMA Welding for Al 5052 and 6061 alloy, Journal of KWJS, 28-6 (2010), 666-670 (in Korean) https://doi.org/10.5781/KWJS.2010.28.6.058
  4. A. El-Batahgy and M. Kutsuna : Laser Beam Welding of AA5052, AA5083, andAA6061 Aluminum Alloys, Advances in Materials Science and Engineering, 2009 (2009), 1-9
  5. A. Punkari, D. C. Weckman and H. W. Kerr : Effects of Magnesium Content on Dual Beam Nd:YAG Laser Welding of Al-Mg Alloys, Scienece and Technology of Welding and Joining, 8-4 (2003), 269-281 https://doi.org/10.1179/136217103225005516
  6. S. Fujinaga, H. Takenaka, T. Narikiyo, S. Katayama and A. Matsunawa : Direct Observation of Keyhole Behavior during Pulse Modulated High-Power Nd:YAG Laser Irradiation, Journal of Physics, Part D: Applied Physics, 33-5 (2000), 492-497 https://doi.org/10.1088/0022-3727/33/5/304
  7. Matsunawa, M. Mizutani, S. Katayama and N. Seto : Porosity Formation Mechanism and its Prevention in Laser Welding, Welding International, 17-6 (2003), 431-437 https://doi.org/10.1533/wint.2003.3138
  8. T. Y. Kuo and S. L. Jeng : Porosity Reduction in Nd-YAG Laser Welding of Stainless Steel and Inconel Alloy by using a Pulsed Wave, Journal of Physics, Part D: Applied Physics, 38-5 (2005), 722-728 https://doi.org/10.1088/0022-3727/38/5/009
  9. I. Kawaguchi, S. Tsukamoto, G. Arakane and H. Honda : Characteristics of High-Power $CO_2$ Laser Welding and Porosity Suppression Mechanism with Nitrogen Shielding. Study of High-Power Laser Welding Phenomena, Welding International, 20-2 (2006), 100-105 https://doi.org/10.1533/wint.2006.3541
  10. J.-H. Cho, D. F. Farson and M. J. Rieter : Analysis of Penetration Depth Fluctuations in Single-Mode Fibre Laser Welds, Journal of Physics, Part D: Applied Physics, 42-11 (2009), 1-8
  11. J. E. Blackburn, C. M. Allen, P. A. Hilton, L. Li, M. I. Hoque, A. H. Khan : Modulated Nd:YAG Laser Welding of Ti-6Al-4V, Science and Technology of Welding and Joining, 15-5 (2010), 433-439 https://doi.org/10.1179/136217110X12731414739718
  12. 박성현 : 현대실험계획법, 민영사, 1984 (in Korean)
  13. D.-C. Ahn, C. Kim and J.-D. Kim : Laser Lap Welding of Al Alloys 5J32 and 6K32, Proceedings of LAMP2009, 2009, Paper No. #09-138
  14. General Motors Engineers Standards : Automotive Laer Lap Welding Specification (GM4490M), General Motors, 1991