Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study of Weldability for Pure Titanium by Nd:YAG Laser(I) - Weld Properties with Shield Conditions -

순티타늄판의 Nd:YAG 레이저 용접성에 관한 연구(I) - 실드 조건에 따른 용접특성 -

  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 곽명섭 (대우조선해양(주) 산업기술연구소) ;
  • 김창수 ((주)동화엔텍 열유체연구소)
  • Published : 2009.10.31
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Abstract

Pure titanium and its alloys have good formability, excellent corrosion resistance and high strength to weight ratios. Therefore, it has been using to heat exchangers, offshore plants, sports equipments, and etc. As broad as its application fields, it also increases welding locations. Conventional GTAW and GMAW are very popular welding methods of titanium, but it has a high heat input and wide HAZ. It has a possibility of inducing Stress Corrosion Cracking. So, laser welding method has been using to get reliable welds by reducing heat input. Weld beads change its color to silver, gold, brown, blue, and gray by shied conditions. And the closer to gray, the more oxidize, nitride and embrittlement. The most effective atom to embrittlement was nitrogen. And shield gas flow was not so effective over the constant flow rates. In this study, weld properties of the pure titanium were investigated by pulsed & CW Nd:YAG lasers and evaluated by various shield conditions. And It is observed that nitrogen is more effective to oxidation and embrittlement of titanium compared with oxygen by oxygen and nitrogen quantitative analysis.

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References

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