| FSW | Friction stir welding |
| SSFSW | Stationary shoulder friction stir welding |
| 1st welds | First welds |
| 2nd welds | Second welds |
| WNZ | Weld nugget zone |
| WNZ1 | First weld nugget zone |
| WNZ2 | Second weld nugget zone |
| WNOZ | Weld nugget overlap zone |
| HAZ | Heat affect zone |
| TMAZ | Thermo-mechanically affected zone |
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