Title page for etd-0720114-173511


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URN etd-0720114-173511
Author You-Jyun Li
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Theoretical and Experimental Studies on the Heat Transfer and Material Flow during the Friction Stir Welding Process using an Embedded-rod Tool
Date of Defense 2014-07-28
Page Count 82
Keyword
  • pinless
  • heat transfer
  • empirical equations
  • material flow
  • friction stir welding
  • Abstract A friction model is proposed to investigate the heat transfer and the material flow during the friction stir welding (FSW) process using a plain tool and an embedded-rod tool. Results show that under identical welding parameters, the embedded-rod tool has higher interface temperature with larger range of material flow than that of plain tool. The stick/slip ratio between the tool and the specimen is predicted. The theoretical model is verified by measuring the histories of the temperature with examining the observations on the cross-section of specimens experimentally. Theoretical results show that the stick/slip ratio increases with increasing rotational speed under a certain of downward force; the stick/slip ratio increases with increasing downward force under a certain of rotational speed. The computational results of the depth and range of stir zone are in very good agreement with the observations from the experiments. The material flow speed for the embedded tool is much larger than that for the plain tool using the spot welding. With increasing weld speed, the weld temperature decreases, and the temperature in front of the tool is lower than that behind the tool. The temperature at the retreating side is slightly higher than that at the advancing side. Material flow speed and range decrease with increasing weld speed and material flow speed in front of the tool is significantly higher than that behind the tool. The empirical equations of maximum interface temperature rises are obtained by analyzing the maximum interface temperature rises under different downward force, rotational speed and weld speed for the plain tool and the embedded-rod tool using the method of least squares.
    Advisory Committee
  • Yeau-Ren Jeng - chair
  • Jen-Fin Lin - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0720114-173511.pdf
  • indicate access worldwide
    Date of Submission 2014-08-20

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