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Formability of CO2 Laser Tailor Welded Blanks (TWB)

Ataei, Amir | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40424 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Akbarzade, Abbas
  7. Abstract:
  8. There is a major interest to manufacturers of automobile and aerospace parts towards the tailor-welded blanks (TWBs) to reduce the weight and cost of the parts and improve their performance. In this work, formability of four groups of TWBs (two groups with similar thicknesses and different steels and two groups with similar steels and different thicknesses) are investigated. To produce the TWBs, DX54, E275 and E335 steel sheets were used. The results indicate that the inclined laser beam causes the sample failure from the weld zone in the tensile test. Setting the focal point on the top surface of the sheets results in enhancement of yield strength in comparison to the other positions. Due to high cooling rate at weld zone, microstructure of the weld mainly consists of acicular ferrite, Widmanstatten ferrite, allotropic ferrite and to some extent low carbon bainite. While the strength of the TWBs are more than those of the base sheets base sheets, their elongations are less than them. It is observed that in all cases formability of the TWBs are decreased by welding and due to nonuniform strain their FLDs are lower than these of the base metals. By increasing the strength ratio (SR), formability of the TWBs improved
  9. Keywords:
  10. Formability ; Forming Limit Diagram (FLD) ; Tailor Welded Blanks (TWB) ; Laser Welding

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