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Performance evaluation of discontinuous friction stir welding
Merry, Joshua D.
Merry, Joshua D.
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t11107_Merry.pdf
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2011-12
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Electronic dissertations
Electronic dissertations
Electronic dissertations
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Abstract
Friction stir welding has been shown by previous investigators to have many advantages
over traditional metal joining practices. Friction stir lap welds and friction stir spot welds have
been shown to be stronger than rivets when joining materials of the same thickness.
Substructures containing continuous lap welded joints have demonstrated increased load carrying
capabilities over their riveted counterparts. In full-scale structures, however, continuous welds
are not always an option. Welds may be interrupted by fixturing limitations, tooling restrictions,
or stiffening members that cross the weld path. In these situations, a discontinuous lap weld
would be necessary. The principal problem with a discontinuous weld is that the tool plunge and
exit locations cannot be eliminated with a run-off tab, as in continuous welded structures. These
plunge and exit locations are then subjected to operational loads. In fatigue applications, it has
been demonstrated that cracks will initiate in the exit hole of a discontinuous weld. The purpose
of this study was to investigate techniques to terminate a lap weld without compromising the
structure by leaving an unprotected exit hole.
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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering.
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Wichita State University
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Copyright Josh Merry, 2011. All rights reserved