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An Investigation Into the Energy Absorption of Friction Stir Welded Aluminum

Amiri, Mahsa | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43703 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen; Kokabi, Amir Hossein
  7. Abstract:
  8. Friction stir welding (FSW) is an appropriate method for joining Aluminum structures. In this method lots of defects involved in other methods are not formed and good properties are achieved for Aluminum joints. The metal sheets joined by this method are used to manufacture metal structures bodies. One of the important issues in the structure bodies used in transportation is the amount of energy absorbed in collision with other objects. One of the methods to investigate the energy absorption is wedge tearing test and one other is tensile test. In the preset study two sheets of Al 1050 were joined using FSW method in different tool rotational and welding speeds. Firstly, the microstructure of welded specimens in various parameters was studied.Then, the capacity of energy absorption in wedge tearing and tensile testing methods was evaluated. Energy absorption in wedge tearing test was determined in two directions (0 and 90 degree) toward weld line. The results showed that stir zone includes fine equiaxed grains. Grain size in this region increases with increasing tool rotational speed or decreasing welding speed. In tensile test, specimens welded with rotational speed of 1200 rpm, in all selected welding speeds, have the highest amounts of energy absorption. In the case of wedge tearing test, when the wedge moves parallel with the weld line, energy absorption has larger amounts in comparison with the case in which the wedge moves perpendicular to weld line. The cause of this matter is that in parallel case, cutting and friction which have the most portions in energy absorption occur in weld metal which has higher tensile strength in relation to base metal. Additionally, it was revealed that in parallel case, specimens welded with tool rotational speed of 600 rpm, in all selected welding speeds, have the highest amounts of energy absorption. In perpendicular case, the difference in energy absorption of the specimens is not remarkable.

  9. Keywords:
  10. Aluminum ; Energy Absorption ; Tensile Test ; Friction Stir Welding ; Wedge Tearing Test

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