Title page for etd-0803113-141338


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URN etd-0803113-141338
Author Wei-Lun Li
Author's Email Address cannedlaughter13@gmail.com
Statistics This thesis had been viewed 5331 times. Download 7 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Friction Models for Theoretical and Experimental Studies on the Heat Transfer and Material Flow during the Friction Stir Welding Process
Date of Defense 2013-07-24
Page Count 103
Keyword
  • heat conduction
  • flow behavior of material
  • stick-slip ratio
  • pinless
  • embedded-type
  • critical temperature
  • friction stir welding
  • Abstract In this study, a theoretical model was used to simulate the phenomena of heat
    conduction and the flow behavior of material in the process of friction stir welding with
    the pinless and the embedded-type tools. The friction model was employed to predict
    the stick-slip ratio between the tool and the material. Theoretical results showed that
    under the same downward force, the higher the rotational speed, the greater stick-slip
    ratio is; and under the same rotational speed, the greater the downward force, the greater
    stick-slip ratio. Results also showed that the embedded-type tool has wider stirred range
    with higher flow speed of the material than that of the pinless tool.
    The interface temperatures between the butt SS400 steels were measured using the
      K-type thermocouples during the welding process, numerical results were in very good
    agreement with the measured temperatures at the steady-state conditions. The welded
    regions displayed three different zones including the stir zone, the
    thermo-mechanically affected zone, and the heat affect zone. By the isotherm and the
    phase diagram, the stir zone could be predicted at the temperature above 1394 ˚C
    where the δ-phase of the ferrite was found, the thermo-mechanically affected zone
    was between the upper critical temperature 880 ˚C and 1394 ˚C. Comparing with the
    pinless tool, the numerical and experimental results showed that the embedded-type
    tool had the more obvious stir zone under the same welding conditions.
    Advisory Committee
  • Yeau-Ren Jeng - chair
  • Jen-Fin Lin - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0803113-141338.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-09-03

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