Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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THE EVALUATION OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDEDAL-MG-SI ALLOY

  • Lee, Won-Bae (Dep. of Advanced Materials Engineering, SungKyunKwan Univ.) ;
  • Yeon, Yun-Mo (Dep. of Automatic-Welding Engineering, Suwon-Science College) ;
  • Jung, Seung-Boo (Dep. of Advanced Materials Engineering, SungKyunKwan Univ.)
  • Published : 2002.10.01
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Abstract

The microstructural change associated with the hardness profile in friction stir welded, age-hardenable 6005 Al alloy had been evaluated. Frictional heat and plastic flow during friction stir welding created the fine recrystallized grain (Stir Zone, SZ), the elongated and recovered grain (Thermo-Mechanical Affected Zone, TMAZ) in the weld zone. Heat affected zone (HAZ), which could be only identified by hardness test because there is no difference in the grain structure compared with that of the base metal, was formed beside the weld zone. A softened region had been formed near the weld zone during friction stir welding process. The softened region was characterized by the dissolution and coarsening of the strengthening precipitate during the friction stir welding. The sound joints of 6005 Al alloys were successfully formed under a wide range of the friction stir welding conditions.

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