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1773582 
Journal Article 
Effect of process parameter on mechanical properties of friction stir welded tailored blanks from aluminium alloy 6181-T4 
Sheikhi, S; dos Santos, JF 
2007 
12 
4 
370-375 
WOS:000249725400013 
Tailor welded blanks ( TWBs) are produced by joining at
least two sheets of dissimilar gauge and/or properties to achieve a lighter blank of desired
stiffness and strength. In this way, the properties of the blank may be tailored to meet the
design requirements of a panel. As in steel structures, cost and weight can be saved when using
the TWB concept for aluminium. However, use of aluminium is a concern in the automotive industry
because of well documented weldability and reproducibility problems, since relatively minor
changes in welding parameters may affect the quality of the weld. Friction stir welding offers an
attractive alternative to conventional fusion welding methods because of the excellent properties
( particularly ductility), reproducibility, robustness and surface finish obtained. However, the
working envelope for friction stir welded tailored blanks has yet to be fully explored. In the
present study TWBs of the alloy 6181-T4 in a thickness combination 1 to 2 mm have been produced.
The influence of welding parameters and welding tools on the weld quality and mechanical
properties has been determined. Satisfactory surface finish with no detrimental effects to the
mechanical properties has been observed. Weld efficiencies 90% have been consistently achieved. 
aluminium alloys; tailored blanks; friction stir welding; mechanical properties; microstructure