Abstract
In this work, 0.8-mm-thick 2024 aluminum alloy was friction stir lap welded with the assistance of a stationary shoulder system. The joint surface formation, microstructure and mechanical properties of the welded joints were studied. The results showed that sound joints without defect could be obtained at a wide parameter range because stationary shoulder increased the material flow during welding. The stationary shoulder decreased the joint roughness from 125.5 to 58.9 µm. A thickness reduction of 4% was achieved at a welding speed of 200 mm/min. The joint fabricated by the stationary shoulder system had superior lap shear properties compared to the joint fabricated using the conventional tool. A high failure load of 7440 N was achieved at welding speed of 200 mm/min. The joint presented tensile fracture mode and the fracture morphology showed typical ductile fracture.
| Original language | English |
|---|---|
| Pages (from-to) | 6704-6713 |
| Number of pages | 10 |
| Journal | Journal of Materials Engineering and Performance |
| Volume | 28 |
| Issue number | 11 |
| DOIs | |
| State | Published - 1 Nov 2019 |
Keywords
- friction stir lap welding
- lap shear failure load
- sheet thickness reduction
- stationary shoulder
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