Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Mechanical Characteristic Evaluation by Spin Tool of Different Pin Shapes in Friction Stir Welding Al6061-T6

Al6061-T6의 마찰교반용접 시 회전 Tool Pin 형상에 따른 기계적 특성 평가

  • Lim, ByungChul (Department of Mechanical and Automotive Engineering, Kongju National University) ;
  • Kim, DaeHwan (Department of Mechanical and Automotive Engineering, Kongju National University) ;
  • Park, SangHeup (Department of Mechanical and Automotive Engineering, Kongju National University)
  • Received : 2014.03.28
  • Accepted : 2014.06.20
  • Published : 2014.08.15
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Abstract

In this study, an age-hardened 6061-T6 alloy sheet was used, which is commonly utilized for auto parts. The junction strength characteristics in relation to the stirring speed and welding speed were studied in accordance with the friction stir welding rotation of the tool pin. Micro hardness measurements of A type and B type pins, for a welding speed of 400 mm/min and a tool rotational speed 3000 rpm, were obtained as Hv104 and Hv111, respectively. For a welding speed of 200 mm/min and a tool rotational speed of 2000 rpm, we obtained Hv48 and Hv50 for A and B type pins, respectively. Microstructure observation showed that the stirring portion was fine and uniform, which occurred because of its plastic deformation. In the thermomechanically affected zone, partial recrystallization was present because of the plastic deformation. The crystal grains in the heat affected zone were coarsened due to the heat generated by friction stir welding.

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References

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