Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지
DOI QR코드

DOI QR Code

The Effect of Process Variables on Mechanical Properties and Formability in GTA Welds of Commercial Pure Titanium Sheet

순 Ti 박판 GTA 용접부의 기계적 성질 및 성형성에 미치는 공정변수의 영향

  • Kim, Jee-Hoon (Department of Materials Science and Engineering, Pusan National University) ;
  • Hong, Jae-Keun (Special Alloys Research Group, Korea Institute of Materials Science) ;
  • Yeom, Jong-Taek (Special Alloys Research Group, Korea Institute of Materials Science) ;
  • Park, Nho-Kwang (Special Alloys Research Group, Korea Institute of Materials Science) ;
  • Kang, Chung-Yun (Department of Materials Science and Engineering, Pusan National University)
  • 김지훈 (부산대학교 재료공학과) ;
  • 홍재근 (한국기계연구원 부설 재료연구소 특수합금연구그룹) ;
  • 염종택 (한국기계연구원 부설 재료연구소 특수합금연구그룹) ;
  • 박노광 (한국기계연구원 부설 재료연구소 특수합금연구그룹) ;
  • 강정윤 (부산대학교 재료공학과)
  • Received : 2010.04.20
  • Accepted : 2010.05.24
  • Published : 2010.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this work, the effect of welding variables on weldability of gas tungsten arc(GTA) welding was investigated with experimental analysis for a commercial pure(CP) titanium (Grade.1). The GTA welding tests on sheet samples with 0.5mm in thick were carried out at different process variables such as arc length, welding speed and electrode shape. In order to search an optimum arc length with full penetration, bead- on-plate welding before butt-welding were performed with different arc length conditions. From the bead- on-plate welding results, the optimum condition considering arc stability and electrode loss was obtained in the arc length of 0.8mm. Butt-welding tests based on the arc length of 0.8mm were carried out to achieve the optimum conditions of welding speed and electrode shape. Optimum conditions of welding speed and electrode shape were suggested as 10 mm/s and truncated electrode shape, respectively. It was successfully validated by the microstructural observation, tensile tests, micro-hardness tests and formability tests.

Keywords

References

  1. 이용태 : 타이타늄, 한국 철강신문, 2009 (in Korean)
  2. R. L. Little : Welding and Welding Technology, Mcgraw -Hill Book Co., (1973) 217
  3. W.R. Oates, A.M. Saitta, Welding Handbook, vol. 4, eighth edition., AWS, (1998) 488
  4. D. Eylon, J.A. Hall, C.M. Pierce and D.L. Ruckl : Metall. Trans. A, 7A (1976) 1817-1826
  5. H. Margolin, J.C. Williams, J.C. Chesnutt and G. Lutjering : Proc. of the 4th int's Conf. on Ti, 1 (1980) 169-216
  6. Thomas BG, Beckermann C : Modeling of casting, welding and advanced solidification processes VIII. Warrendale, PA, The Minerals, Metals and Materials Society (1998)
  7. Byoung Hyun Yoon, Suk Hwan Kim and Woongseong Chang : Recent Trend of Welding Technology for Ti and Ti Alloys, Journal of KWJS, 25-5 (2007) 22-28 (in Korean)
  8. S. Lathabai, B.L. Jarvis, K.J. Barton : Comparison of keyhole and conventional gas tungsten arc welds in commercially pure titanium, Materials Science and Engineering A299 (2001) 81-93
  9. S. Sundaresan, G.D. Janaki Ram, G. Madhusudhan Reddy : Microstructural refinement of weld fusion zones in $\alpha$-$\beta$ titaniumalloys using pulsed current welding, Materials Science and Engineering A262 (1999) 88-100 https://doi.org/10.1016/S0921-5093(98)01010-7
  10. V. Balasubramanian, V. Jayabalan, M. Balasubramanian, : Effect of current pulsing on tensile properties of titanium alloy, Materials and Design 29 (2008) 1459-1466 https://doi.org/10.1016/j.matdes.2007.07.007
  11. M. Balasubramanian, V. Jayabalan, V. Balasubramanian : Effect of microstructure on impact toughness of pulsed current GTA welded $\alpha$-$\beta$ titanium alloy, Materials Letters 62 (2008) 1102-1106 https://doi.org/10.1016/j.matlet.2007.07.065
  12. AWS G2 Committee on Joining Metals and Alloys : Guide for the Fusion Welding of Titanium and Titanium alloys, ANSI:AWS G2.4/G2.4M (2007) 18
  13. S.M.Cho : A study on the bead stability in high speed Tig welding, Journal of the Korean society of marine engineers, 18-3 (1994) 68-77 (in Korean)
  14. 岡田 明, 中村 治方: GTA溶接における陽極擧動と母材の溶 融に及ぼす影響, 溶接學會論文集, 12-1 (1994) 94-100 (in Japanese)