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Effect of Electromagnetic Stirring on GTAW Weld Solidification Structure of AA5052

Haghi Hassanabad, Sultan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41333 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ashuri, Hossein
  7. Abstract:
  8. Conventional defects in GTAW welding of Aluminum 5052 alloy are the decrease in weld zone strength because of grain growth, formation of columnar grains in the fusion line, solidification cracks and porosities. In this work, effect of strong field electromagnetic stirring on solidification structure of 5052 alloy and elimination of GTAW defects have been investigated. For arc welding processes (especially tungsten inert gas welding), a process called magnetic stirring was proposed, patented, and investigated in the 1970s. The essential aim was to improve weld quality and they indicated that the the Lurentz force is cause of weld stirring. In the earlier researches, alternating magnetic field coaxial with the arc axis has been investigated. In this work, the effect of magnetic field perpendicular with the arc axis in conjunction with the above subject also has been investigated. The most important results were: Grain size refinement from 282 to less than 100 decrease of columnar grains from 54% to 12%, decrease and elimination of porosities, more homogeneous grains, decrease of crack sensitivity due to homogeneous grains and increase of Vickers hardness in the weld zone
  9. Keywords:
  10. Electromagnetic Stirrer ; Welding ; Microstructure ; Solidification Microstructure ; Gas Tungsten Arc Welding (GTAW) ; Tungsten Inert Gas (TIG)Welding ; Aluminum Alloy 5052

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