A process or method of making a vehicle passenger compartment floor component
such
as a central tunnel or rocker panel. Base extrusion pieces and upper pieces are
secured by a friction stir welding process to each other and to a portion of a
passenger compartment floor. Upper pieces may be formed by extrusion or may be
formed by a sheet forming process and secured to base extrusion pieces by means
of the friction stir welding process.
