Effects of Tool Rotation and Transition Speed during Friction Stir Welding of Al 7075-T651 Alloy

Al 7075-T651의 마찰교반 용접에 대한 회전속도와 이송속도의 영향

  • 한민수 (목포해양대학교 기관시스템공학부 대학원) ;
  • 전정일 (신양금속주식회사 생산관리팀) ;
  • 장석기 (목포해양대학교 기관시스템공학부 대학원)
  • Published : 2007.04.01


The 7075-T651 Al alloy was welded by friction stir welding. Microstructure, macro behaviors and fracture type in the nugget, thermo-mechanically affected zone(TMAZ) and heat affected zone(HAZ) of the welded part were compared to base metal. The microsturctures of nugget zone were compared with tool rotation speeds and various tool transition speed. When the rotation speeds were decreased and transition speeds were increased, the hardness of nugget zone were decreased. Also, the optimal microstructure was observed at the low rotation speed of 800rpm and the high transition speed of 124mm/min. The transgranular dimple and quasi-cleavage at fractured part of nugget zone were investigated.


Friction Stir Welding(FSW);Heat Affect Zone(HAZ);Thermo-Mechanically Affected Zone(TMAZ);Nugget;Base Metal(BM)


  1. Yun-Mo Yeon, Won-Bae Lee and Seung-Boo Jung, 2001, 'Microstructures and Characteristics of Friction-Stir-Welded Joints in Aluminium Alloys,' Journal of KWS, Vol. 19, No. 6
  2. Seok-Ki Jang and Jeong-Il Kim, 2006, 'Experimental Behaviors of Weld Zone Property of the Butt and the Lap Jointed Specimen Friction -Stir-Welded with 2mm 1050 Aluminum Alloy Sheet,' Journal of KSME, Vol. 30, No. 2, pp. 187-193
  3. Park, S.T., Jung, J.P. and Suhr, C.J., 1994, 'Weldabilities of 7000 Aluminium Alloys(Ⅰ),' Journal of KWS, Vol.12, No. 1
  4. Seok-Ki Jang and Jeong-il Jeon, 2006, 'Weldability of Al 7075 Alloy According To Different Tools and Welding Conditions by F.S.W,' Journal of KSME, Vol. 30, No. 1. pp. 30-41
  5. Lim, S.G., Kim, S.S., KIM, C.G. and Kim, S.J., 2003, 'Microstructural Evolution and Tensile Behavior of Stir Friction Welded Al Alloys,' J. Kor. Inst. Met. & Mater., Vol. 41, No. 11, pp. 743-749
  6. Yutaka, S.S. and Hiroyuki, K, 1999, 'Microstructural Evolution of 6063 Aluminum During Friction Stir Welding,' Metal Mater Trans A, Vol. 30A, pp. 2429-2437
  7. J.G. Kim, H.W. Park, 2003, 'Cleavage and Fracture for Solid Materials Metallography,' Published by Gold, pp. 226-227
  8. J.G. Kim, K.Y. Kim, H.W. Park, 1999 'The Structures of Metallograph,' Published by Gold, pp. 640-642
  9. S.G. Lim, S.S. Kim, C.G. KIM and S.J. Kim, 2005, 'Mechanical Properties of Friciton Stir Welded Al Alloys with Different Hardening Mechanism,' Metals and Materials international, Vol. 11, No. 2, pp. 113-120

Cited by

  1. Mechanical Characteristics and Macro-and Micro-structures on Friction Stir Welded Joints with 5083O Al Alloys vol.33, pp.1, 2009,
  2. Friction Stir Welding of 7075-T651 Aluminum Plates and Its Fatigue Crack Growth Property vol.35, pp.10, 2011,
  3. Mechanical Characteristics and Microstructure on Friction Stir Welded Joints with 6061-T6 Aluminium Alloy vol.33, pp.7, 2009,