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Friction Stir Welding

Friction Stir Welding

Using friction stir welding (FSW), Sapa is able to join profiles into panels up to three metres in width, and lengths in accordance with the customer’s requirements.

Friction Stir Welding (FSW) is a technique that entails joining flush metal surfaces through the mechanical action of a rotating tool. With the effects of pressure and heat, a new, homogenous structure is achieved.

Compared with melt welding, FSW provides greater strength and less heat deformation. FSW is today an established technique – Sapa’s series production started in 1996.

Other advantages compared with fuse welding:

  • Increased strength
  • Increased impermeability – entirely nonporous, sealed joints
  • Joint that are, in principle, flush with the surface
  • Reduced thermal deformation – only minor thermal stresses in the material,
    and consequently flat surfaces
  • Greater repeatability – production has few and easily controlled variables,
    which also creates close tolerances.