Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on Weld Defect and Their Alternatives during Lap Welding of AZ31B Magnesium Alloy by Pulsed Nd: YAG Laser

Nd:YAG 펄스 레이저를 이용한 AZ31B 마그네슘 합금의 겹치기 용접에서 발생하는 용접결함과 그 대책에 대한 연구

  • 김종도 (한국해양대학교 기관공학부) ;
  • 이정한 (한국해양대학교 대학원) ;
  • 김영식 (한국과학기술정보연구원 ReSEAT 전문연구위원)
  • Received : 2011.04.12
  • Accepted : 2011.06.27
  • Published : 2011.06.30
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Abstract

With a tendency for the application of thin magnesium alloy plates in portable electronic equipment such as cell phone and notebook PC, there is a requirement to develop a welding technology for the lap welding of these thin magnesium alloy. This paper presents the single pulsed laser welding of AZ31B magnesium alloy. The effects of fiber types and parameters such as peak power and pulse width on laser weldability were investigated. The results show that weld defects, especially solidification crack, were always generated in the weld. These defects couldn't be controlled by the simple square pulse, but could be improved through the application of variable pulse. It is because that variable pulse has effect of solidification delay by dropping peak power gradually.

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References

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