FSW (Friction Stir Welding)
- During welding the strength reduction at the thermally affected area is very small.
- High joint strength can be achieved.
- As strain is small, residual stress can be suppressed.
FSSW (Friction Stir Spot Welding)
- Requires less energy than resistance welding
- Improves the work environment: no sputtering
Double-acting FSSW process