Weldability with Process Parameters During Fiber Laser Welding of a Titanium Plate (II) - The Effect of Control of Heat Input on Weldability -

티타늄 판재의 파이버 레이저 용접시 공정변수에 따른 용접특성 (II) - 입열량 제어에 따른 영향 -

  • Kim, Jong Do (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Kim, Ji Sung (Graduate School, Korea Maritime and Ocean Univ.)
  • 김종도 (한국해양대학교 기관공학부) ;
  • 김지성 (한국해양대학교 대학원 기관공학과)
  • Received : 2016.09.23
  • Accepted : 2016.11.10
  • Published : 2016.12.01


Laser welding is a high-density energy welding method. Hence, deep penetration and high welding speed can be realized with lower heat input as compared with conventional welding. The heat input of a CW laser welding is determined by laser power and welding speed. In this study, bead and lap welding of $0.5mm^t$ pure titanium was performed using a fiber laser. Its weldability with laser power and welding speed was evaluated. Penetration, bead width, joining length, and bead shape were investigated, and the mechanical properties were examined through tensile-shear strength tests. Welds with sound joining length were obtained when the laser power and welding speed were respectively 0.5 kW and 2.5 m/min, and 1.5 kW and 6 m/min, and the weld obtained at low output presented better ductility than that obtained at high output.

레이저 용접은 고밀도 용접법 중에 하나로 기존 용접방법에 비해 적은 입열로 깊은 용입과 빠른 용접속도를 얻을 수 있다. 연속 출력 파형 레이저 용접 시 입열량은 레이저 출력 및 용접속도에 의해 결정된다. 본 연구에서는 파이버 레이저를 사용하여 두께 0.5 mm의 순 티타늄 박판에 비드 및 겹치기 용접을 실시하였으며 레이저 출력 및 용접속도에 따른 용접성을 평가하였다. 레이저 출력 및 용접속도에 따른 용입깊이, 비드폭, 접합길이, 비드형상을 관찰하고 인장전단시험을 통해 기계적인 특성을 파악하였다. 실험결과, 겹치기 용접은 $P_L=0.5kW$, ${\nu}=2.5m/min$$P_L=1.5kW$, ${\nu}=6m/min$ 조건에서 양호한 접합길이를 가진 용접부를 얻을 수 있었으며, 용접부는 고출력보다 저출력 조건일 때 더 우수한 연성을 나타냈다.


  1. Kim, J. D. and Moon, J. H., 2004, "C-ring Stress Corrosion Test for Inconel 600 and Inconel 690 Sleeve Joint Welded by Nd : YAG Laser," Corrosion Science, Vol. 46, Issue 4, pp. 807-818.
  2. Vandewynckelea, A., Vaamondea, E., Fontana, M., Herwigb, P. and Masciolettic, A., 2013, "Laser Welding Head Tailored to Tube-sheet Joint Requirements for Heat Exchangers Manufacturing," Physics Procedia, Vol. 41, pp. 144-152.
  3. Jiang, P., Wang, C., Zhou, Q., Shao, X., Shu, L. and Li, X., 2016, "Optimization of Laser Welding Process Parameters of Stainless Steel 316L using FEM, Kriging and NSGA-2," Advances in Engineering Software, Vol. 99, pp. 147-160.
  4. Cao, X. and Jahazi, M., 2009, "Effect of Welding Speed on Butt Joint Quality of Ti-6Al-4V Alloy Welded Using a High Power Nd: YAG laser," Optics and Lasers in Engineering, Vol. 47, pp. 1231-1241.
  5. Chen, H. C., Bi, G., Lee, B. Y. and Cheng, C. K., 2016, "Laser Welding of CP Ti to Stainless Steel with Different Temporal Pulse Shapes," Journal of Materials Processing Technology, Vol. 231, pp. 58-65.
  6. Song, G. and Luo, Z., 2011, "The Influence of Laser Pulse Waveform on Laser-TIG Hybrid Welding of AZ31B Magnesium Alloy," Optics and Lasers in Engineering, Vol. 49, pp. 82-88.
  7. Choi, S. Y., Kim, J. D. and Kim, J. S., 2015, "The Study on Weldability of Boron Steel and Hot-stamped Steel by Using Laser Heat Source(III)," The Korean Society of Mechanical Engineers, Vol. 39, pp. 89-94.
  8. Squillace, A., Prisco, U., Ciliberto, S. and Astarita, A., 2011, "Effect of Welding Parameters on Morphology and Mechanical Properties of Ti-6Al-4V Laser Beam Welded Butt Joints," Journal of Materials Processing Technology, Vol. 212, pp. 427-436.
  9. Casalino, G., Mortello, M. and Campanelli, S. L., 2015, "Ytterbium Fiber Laser Welding of Ti6Al4V Alloy," Journal of Manufacturing Processes, Vol. 20, pp. 250-256.