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Weld orientation effects on the formability of tailor welded thin steel sheets

Moayedi, H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.tws.2020.106669
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Tailored welded blanks (TWBs) technology can give the important possibilities to obtain components in the automobile industry. Friction stir welding (FSW) is a joining approach, which can adhere parts well with desired properties in weld zone. In this article, the main aim is investigation the effect of weld zone orientation on forming limit diagram (FLD) of the TWBs using experimental and finite element model. Three TWBs are produced FSW with three different orientations of weld zones including 00, 450 and 900 against major stress direction. The microstructure of the weld zones is divided and then observed via metallography procedures. Tensile tests are carried out to determine the mechanical properties of TWB sections and duplicate the tests numerically to validate the formability results. The Nakazima stretch test is used to derive the limit strains for three different weld orientations (between rolling direction and welding path) and what can be seen is the changeable effect of these ordinations on varying strain paths. The best formability is for TWB with orientation weld 900 in tension mode while, results reveals that in Plane strain condition best formability is originated from TWB with weld orientation 00. For biaxial tension condition ε2=ε1, changing the weld orientation has no effect on formability. The comparison between FEM and experimental tests reveals good agreement and high recommended FEM for this type of study. © 2020 Elsevier Ltd
  6. Keywords:
  7. Tailored welded blank ; Automotive industry ; Finite element method ; Formability ; Friction ; Microstructure ; Research laboratories ; Strain ; Tensile testing ; Welds ; Experimental test ; Forming limit curve ; Forming limit diagrams ; Friction stir welding (FSW) ; Rolling direction ; Stress directions ; Tailored welded blanks ; Thin steel sheets
  8. Source: Thin-Walled Structures ; Volume 149 , April , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0263823119313497