A Study of Weldability for Pure Titanium by Nd:YAG Laser(II) - Welding Properties of Butt Welding -

순티타늄판의 Nd:YAG 레이저 용접성에 관한 연구(II) - 맞대기 용접 특성 -

  • 김종도 (한국해양대학교 기관시스템공학부) ;
  • 곽명섭 (대우조선해양(주) 산업기술연구소) ;
  • 송무근 (한국해양대학교 대학원) ;
  • 박성하 ((주)동화엔텍 열유체연구소)
  • Published : 2009.12.31


Recently, as titanium and titanium alloys are being increasingly used in wide areas, there are on-going researches to obtain high quality weld zone. In particular, growing interest is being drawn to laser welding, which involves low heat input and large aspect ratio in various welding processes and can facilitate shield in atmospheric condition compared with electron beam welding. The first report covered the analysis of embrittlement by the bead color of weld zone through quantitative analysis of oxygen and nitrogen and measurement of hardness as basic experiment to apply laser welding to titanium. Results indicated that the element that affect embrittlement the most was nitrogen, and as embrittlement and oxygenation go on, bead color changed to silver, gold, brown, blue and gray. This study performed butt welding of pure titanium and STS304 by using 1kW CW Nd:YAG laser, and to find out basic physical properties, evaluated welding performance by laser output, welding speed, root gap and misalignment etc, and examined mechanical properties through tensile stress and Erichsen test. The reason particles of pure titanium welded metal and HAZ are greater than STS304 is because they are pure metal and do not include many impure elements that work as nuclei in case of resolidification, thus becoming coarse columnar crystals eventually. In addition, the reason STS304 requires more energy during welding than pure titanium is because the particle size of base metal is smaller.



  1. C. Leyens and M. Peters : Titanium and Titanium Alloys, Fundamentals and applications, Wiley-VCH, 2003
  2. 이용태, 김승언, 현용택, 정희원 : 꿈의 신소재 티타늄, 한국철강신문, 2003(in Korean)
  3. Toshikatsu Asahina and Yosuke Itoh : Structures and Mechanical Properties of Butt Welded Pure Titanium Sheet Using Pulsed YAG Laser, Journal of Japan Institute of Light Metals, 55-8(2005), 337-342 (in Japanese)
  4. Hiraga Hitoshi, Fukatsu Ken-ichi, Ogawa Kohsaku, Nakayama Mitsuru and Mutoh Yoshiharu : Nd:YAG Laser Welding of Pure Titanium to Stainless Steel, Journal of Japan Welding Society, 19-4(2001), 717-726 (in Japanese)
  5. B. Majumdar, R. Galun, A. Weisheit and B. L. Mordike : Formation of a Crack-Free Joint Between Ti Alloy and Al Alloy by Using a High-Power CO2 Laser, Journal of Materials Science, 32(1997), 6191-6200
  6. Jong Do Kim, Myung Sub Kwak, Chang Soo Kim : A Study of Weldability for Pure Titanium by Nd:YAG Laser(I) - Weld Properties with Shield Conditions -, Journal of KWS, 27-5(2009), 55-61 (in Korean)
  7. Lida. T. and Guthrie R.I.L. : The Physical Properties of Liquid Metals, American Society for Metals(ASM), 1982
  8. W. W. Duley : Laser Welding, A wiley-Interscience Publication, 1998
  9. John A. Mountford : Titanium-properties, advantages and applications solving the corrosion problems in marine service, CORROSION 2002, NACE International, Paper #02170, 2002
  10. A. Matsunawa, T. Ohnawa : Beam-Plume Interaction in Laser Materials Processing, Transactions of JWRI in Osaka University, 20-1(1991), 15-39