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JWJ > Volume 31(2); 2013 > Article
Journal of KWJS 2013 April;31(2) :16-20.
Published online June 5, 2013.
doi:https://doi.org/10.5781/KWJS.2013.31.2.16
Recent Trends of Friction Stir Welding of Titanium
Chang-Keun Chun, Sung-Wook Kim, Heung-Joo Kim, Woong-seong Chang, Joong-suk Noh
R&D center, Taekwang Tech Co., LTD
Research Institute of Industrial Science & Technology
Correspondence: Chang-Keun Chun  Email: ckchun@rist.re.kr
  Published online June 5, 2013
ABSTRACT
Titanium and its alloys have been widely using in the various field of industry application due to high corrosion resistant properties and mechanical properties. Titanium is highly reactive in the high temperature state and the formation of titanium oxide and porosities in the nuggets of fusion welding will results in the degradation of the mechanical properties. For this reason the studies of friction stir welding for titanium have been investigated recently. The FSW zones of titanium were classified by the weld nugget (WN), the linear transition boundary (TB) and the heat affected zone (HAZ). The WN along with titanium parent was characterized by the presence of twins and dislocations. The average grain size and hardness of WN has been changed according to heat input. The grain refinement resulted from the FSW increased the hardness in the stir zone. Sound dissimilar joints between SUS 304 and CP-Ti were achieved using an advancing speed of 50 mm/min and rotation speeds in the range of 700-1100 rpm. Aluminum 1060 and titanium alloy Ti-6Al-4V plates were lap joined by friction stir welding, hence the ultimate tensile shear strength of joint reached 100% of Al 1060. Mg alloy and Ti were successfully butt joined by inserting a probe into the Mg alloy plate with slightly offsetting. But Ti-Al intermetallic compound layers formed at the interface of these joints.
Keywords: Titanium alloys | Friction stir welding | Dissimilar welding
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