The Study on Weldability of Boron Steel and Hot-Stamped Steel by Using Laser Heat Source (II) - Laser Weldability of Hot Stamping Steel with Ultra-High Strength -

레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (II) - 초고강도 핫스탬핑강의 레이저 용접특성 -

  • Kim, Jong Do (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Choi, So Young (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Park, In Duck (Busan Laser Application Support Center, Korea Institute of Machinery & Materials)
  • 김종도 (한국해양대학교 기관공학부) ;
  • 최소영 (한국해양대학교 기관공학부) ;
  • 박인덕 (한국기계연구원 부산레이저기술지원센터)
  • Received : 2014.09.29
  • Accepted : 2014.10.13
  • Published : 2014.12.01


Hot-stamping is a method of obtaining ultrahigh-strength steel by simultaneously forming and cooling boron steel in a press die after it has been heated at $900^{\circ}C$ or above. After heat treatment, boron steel has a strength of 1500 MPa or more. This material ensures a high level of quality because it overcomes the spring-back phenomenon, which is a problem associated with high-strength steel materials, and the degree of dimensional precision is improved by 90 or more because of the good formability compared with existing types of steel. In this study, the welding characteristics were identified through the butt and lap welding of hot-stamped steel using a disk laser. Full penetration was obtained at a faster speed with butt welding compared to lap welding, and a white band was observed in every specimen.


Hot Stamping Process;Laser Welding;Welding Patameters


  1. Kim, N. H., Kwon, K. Y. and Kang, C. G., 2009, "The Study of Mechanical Property and Micro-Structural Evolution for 22MnB5 During Hot Stamping According to Cooling Condition," Proceedings KSME Spring Annual Meeting 2009, pp. 78-83.
  2. Choi, H. S., Kim, B. M., Park, G. H. and Lim, W. S., 2010, "Optimization of Resistance Spot Weld Condition for Single Lap Joint of Hot Stamped 22MnB5 by Taking Heating Temperature and Heating Time into Consideration," Trans. Korean Soc. Mech. Eng. A, Vol. 34, No. 10, pp. 1367-1375.
  3. Karbasian, H. and Tekkaya, A. E., 2010, "A Review on Hot Stamping," Journal of Materials Processing Technology, Vol. 210, No. 15, pp. 2103-2118.
  4. Kim, C., Kang, M. J. and Park, Y. D., 2011, "Laser Welding of Al-Si Coated Hot Stamping Steel," Procedia Engineering, Vol. 10, pp. 2226-2231.
  5. Jee, S. H., Han, M. S., Ahn, K. W., Lee, J. S. and Jeon, E. C., 2011, "A Study on the Optimum Condition for the Welding Spatter Occuring Reduction for Boron Steel Using by Hot-Stamping," Journal of The Korean Society of Manufacturing Process Engineers, pp. 33-34
  6. Kim, Y., Park, K. Y. and Lee, K. D., 2010, "Evaluation of Laser Welding Characteristics of 1.5GPa Grade Ultra High Strength Steel for Automotive Application," Journal of KWJS, Vol. 28, No. 6, pp. 4-9.
  7. Arias, R., Prada, A., Vaamonde, E., Vandewynckele, A., Gutierrez, D., Lara, A. and Garcia, M., 2010, "Laser Welding Applied to Advanced High Strength Steels for Automotive Applications," ICALEO, 1002, pp. 371-379
  8. Gu, Z., Yu, S., Han, L., Meng J., Xu, H. and Zhang, Z., 2011, "Microstructures and Properties of Ultra-high Strength Steel by Laser Welding," ISIJ International, Vol. 51, No. 7, pp. 1126-1131