Title page for etd-0819111-100631


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URN etd-0819111-100631
Author Fang-Hua Su
Author's Email Address slid96@yahoo.com.tw
Statistics This thesis had been viewed 5334 times. Download 216 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies on the Friction Stir Welding of Aluminum Alloy Sheets
by Using High Speed Steel Tool Inserted Aluminum Alloy
Date of Defense 2011-07-26
Page Count 106
Keyword
  • Friction stir welding
  • Inserted type of friction tool
  • Aluminum alloy
  • Plastic flow
  • Failure load.
  • Abstract In this study, a novel inserted type of friction welding tool was
    proposed, where the circular rod was embedded in its central axis using the
    material same as the workpiece, so that it could effectively promote the
    friction heat quickly and enhance the welding quality. The welding tool
    was made of the high-speed steel, the workpiece with its embedded
    material 6061-T6 aluminum alloy. A vertical milling machine equipped
    with dynamometer, which could measure the power during the friction stir
    welding, was employed as the experimental apparatus. During the welding
    process, the K-type thermocouple was used simultaneously in measuring
    the welding temperature at the interface of joint. The operating conditions
    of welding were as followings: the welding speed of 800 rpm, the tool
    inclination of 1° and the clamping force 2kN, the tool with 12mm in
    diameter and 0.21mm in depth under the downward force about 2 kN. The
    experiment was conducted into two stages.
    The first stage was a spot welding to investigate the effect of the ratio
    of the diameter of embedded material (d) to the diameter of welding tool (D)
    on the temperature of the interface of joint, the thickness of plastic flow,
    and the failure load of weld. Experimental results revealed that the interface
    temperature, the plastic flow thickness, and the failure load of weld are
    directly proportional to d/D. In comparison with the welding tool without
    insert (d/D = 0), the maximum interface temperature increased about 1.12
    times at d/D = 0.83, the plastic flow thickness increased about 1.52 times,
    and the failure load of weld increased about 1.45 times. In the second stage,
    the feeding process was included to investigate the influence of the
    diameter and the thickness of embedded material on the interface
    temperature, the plastic flow thickness, and the failure load of weld.
    Experimental results revealed that the plastic flow thickness was less than 2
    mm when the thickness of embedded material was less than 3 mm.
    However, when the thickness of embedded material was larger than 5 mm,
    the plastic flow thickness could achieve to 3 mm. Hence, the thickness of
    embedded material should be larger than 5mm. Moreover, the effect of the
    diameter of embedded material on the interface temperature and the plastic
    flow thickness using the feeding process was almost the same as the spot
    welding. However, in comparison with the welding tool without insert, the
    failure load of weld increased about two times.
    Advisory Committee
  • Jen Fin Lin - chair
  • Yeau-Ren Jeng - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0819111-100631.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2011-08-19

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