Friction Stir Welding (FSW)
This welding method is based on the plastic distortion of materials at high temperatures (just below melting point).
The distortion is caused by fast rotating tools that cause friction heat. The melting surfaces are then pressed together under high pressure, thus creating a very strong bond with a homogenous structure.
Sapa Profiles has a Friction Stir Welding (FSW) installation where elements can be joined up to a length of eight meters. The advantages of Friction Stir Welding:
- Greater strength
- Improved seal (non porous)
- Marginal increase
- Minimum heat development
- High reproducibility
- Extremely narrow tolerances
More information is available on the "The Welding Institute" site.