Abstract
In friction stir welding (FSW), tool geometry plays an important role in joint quality. In order to improve mechanical properties of friction stir lap welding (FSLW) joint, a tool with a reverse-threaded pin was designed in the present study. Using 2024-T4 aluminum alloy as the research object, tools with the full-threaded pin and reverse-threaded pin were used in FSLW. Results showed that, when using the same parameter combination, FSLW joint using the reverse-threaded pin owned bigger effective sheet thickness (EST), bigger lap width and better lap shear failure strength. Compared with the full-threaded pin, fracture mode of the FSLW joint changed from shear fracture mode to tensile fracture mode when the reverse-threaded pin was used. Fracture morphologies presented ductile fracture.
| Original language | English |
|---|---|
| Pages (from-to) | 671-675 |
| Number of pages | 5 |
| Journal | Journal of Materials Science and Technology |
| Volume | 32 |
| Issue number | 7 |
| DOIs | |
| State | Published - 1 Jul 2016 |
Keywords
- Fracture position
- Friction stir lap welding
- Hook
- Reverse-threaded pin
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