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Influences of joint geometry on defects and mechanical properties of friction stir welded AA6061-T4 T-joints
- Source :
- Materials & Design. 53:106-117
- Publication Year :
- 2014
- Publisher :
- Elsevier BV, 2014.
-
Abstract
- In this paper, AA6061-T4 T-joints with three different joint geometries of T-lap/T-butt-lap/T-butt were fabricated successfully by friction stir welding. The distributions and formation mechanisms of defects in friction stir welded (FSWed) T-joints were discussed through macro and micro-observations, respectively. Hardness profiles of the as-welded samples were also measured to evaluate the softening effect during the process. What’s more, influences of joint geometry and the traverse speed on the tensile properties of FSWed T-joints were investigated. All the experimental results indicate that tunnel defects and kissing bond are easily formed and vary significantly in T-joints of the three joint geometries. Defects are moderated to a large extent with decreasing the traverse speed, but the specific relationship to tensile properties is complicated. T-lap joints present the superior tensile properties along the skin direction among the three geometries, the same as T-butt joints along the stringer direction. All the as-welded samples almost fractured in the locations of softening zones and bonding surfaces.
Details
- ISSN :
- 02613069
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Materials & Design
- Accession number :
- edsair.doi...........488650309a49d328223b7b2953e3ccae