Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on the Weldability and Mechanical Characteristics of Dissimilar Materials Butt Joints by Laser Assisted Friction Stir Welding

Laser-FSW Hybrid 접합기술을 적용한 이종재료(Al6061-T6/SS400) 접합부의 접합성 및 기계적 특성에 관한 연구

  • Bang, Han-Sur (Dept. of Naval Architecture & Ocean Engineering, Chosun University) ;
  • Bang, Hee-Seon (Dept. of Naval Architecture & Ocean Engineering, Chosun University) ;
  • Kim, Hyun-Su (Dept. of Naval Architecture & Ocean Engineering, Graduate School, Chosun University) ;
  • Kim, Jun-Hyung (Dept. of Naval Architecture & Ocean Engineering, Graduate School, Chosun University) ;
  • Oh, Ik-Hyun (Automotive Components Center, Korea Institute of Industrial Technology(KITECH)) ;
  • Ro, Chan-Seung (Dept. of Naval Architecture & Mechanics, Chosun University College of Science and Technology)
  • 방한서 (조선대학교 공과대학 선박해양공학과) ;
  • 방희선 (조선대학교 공과대학 선박해양공학과) ;
  • 김현수 (조선대학교 대학원 선박해양공학과) ;
  • 김준형 (조선대학교 대학원 선박해양공학과) ;
  • 오익현 (한국생산기술연구원 동력부품센터) ;
  • 노찬승 (조선이공대학 선박해양.기계과)
  • Received : 2010.08.09
  • Accepted : 2010.12.06
  • Published : 2010.12.31
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Abstract

This study intends to investigate the weldability and mechanical characteristics of butt weld joints by LAFSW for dissimilar materials (Al6061-T6 and SS400). At optimum welding conditions, the tensile strength of dissimilar materials joints made by FSW is found to be lower than that of LAFSW. Due to the increase in plastic flow and formation of finer recrystallized grains at the TMAZ and SZ by laser preheating in LAFSW, the hardness in LAFSW appeared to be higher than that of FSW. Compared with FSW, finer grain size is observed and elongated grains in parent metal are deformed in the same direction around the nugget zone in TMAZ of Al6061-T6 by LAFSW. Whereas, at weld nugget zone, coarse grain size is appeared in LAFSW compared to FSW, which is owing to more plastic flow due to laser preheating effect. In dissimilar materials joints by LAFSW, ductile mode of fracture is found to occur at Al6061 side with fewer brittle particles. Mixed mode of cleavage area and ductile fracture is observed at SS400 side.

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References

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