Friction stir welding

Friction stir welding is a solid state welding process. It consists in assembling, without metal contribution, two parts by bringing them in a pasty state, thanks to the heat generated by the friction of a tool in rotation.

This process is mainly used to assemble aluminum alloys. It avoids the problems associated with fusion, such as cracks, porosity, or a decrease in the strength of the welded area.

Saint Jean Industries uses this process to manufacture its COBAWHEELS aluminum wheels. It is also used to manufacture battery boxes and power electronics housings.

Soudage par friction

The advantages of FSW for rims

  • No filler metal or other consumables required
    Environmentally friendly: no fumes, arc, burrs or UV radiation
  • Allows the assembly of different materials while preserving their mechanical properties,
  • Minimizes thermomechanical stresses and strains
  • Suitable for small and large series.
  • Very low cost because it does not require additional dedicated equipment and consumes very little energy.
  • Excellent productivity (welding speed up to 3m/min).
    Improved working conditions because it produces no harmful gases and very little noise.

Our cobawheels™ process

Exemple d'une jante aluminium avec le procédé Cobawheels


This process offers great design flexibility, improved mechanical characteristics, and very good fatigue resistance

Fluotournage jantes aluminium Cobawheels

Flow forming

A process commonly used in the manufacture of cast aluminum rims, Saint Jean Wheels applies it to an extruded tube to lighten the rim bed.

Soudage par friction jantes aluminium

Friction stir welding

Used to weld the two parts of the rim, without adding metal, whatever the alloys used