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Thermo-mechanical Study on TIG Welding of AA2024 Alloy and Subsequent Microstructural Events

Sarmast, Ardeshir | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43882 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Serajzadeh, Siamak; Kokabi, Amir Hossein
  7. Abstract:
  8. In this study, temperature and Thermo-mechanical stress Distributions during and after TIG welding operations of AA2024 have been investigated by means of numerical simulation and experimental observations. Different geometries and initial microstructures, i.e. artificially and naturally aged alloys, have been selected. The model can determine the effect of welding parameters as well as mechanical fixtures on temperature and stress fields developed within metal being welded. Furthermore the subsequent aging behaviour of welded alloy (up to 70 days) has been evaluated employing hardness measurement and tensile testing. In addition, microstructural evolutions have been made utilising Scanning Electron Microscopy (SEM) and optical metallography. Finally, the distribution of residual stresses has been measured by X-ray diffraction method. In order to verify the predictions, the predicted and measured weld pool dimensions have been compared and reasonable reasonable agreement has been observed. The magnitudes of residual stresses in artificially aged samples are higher than those in naturally aged samples. In which in AA2024-T6-6mm the longitudinal residual stress reaches to about 300MPa while in AA2024-T4-6mm is about 283MPa
  9. Keywords:
  10. Tungsten Inert Gas (TIG)Welding ; Residual Stress ; Age Hardening ; Thermomechanical Processing ; Aluminum Alloy 2024 ; Natural Aging ; Artificial Aging

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