Front Bumper Reinforcement: Description and Operation

Door and Bumper Reinforcement Beams, and 1500 MPa Parts

The door reinforcement beams are made from high-strength steel.

The side frame extension upper stiffener, the front floor frame upper stiffener, the side sill stiffener, the front floor crossmember, and the center crossmember stiffeners are made from 1500 MPa steel.

If high-strength steel is heated, the strength of the steel is reduced. If high-strength steel is damaged, for example, in a collision, and the door reinforcement beams or the 1500 MPa parts are bent, the beams or the 1500 MPa parts may crack when attempting to straighten them. If a door beam is damaged, the whole door panel assembly must be replaced.

The front and rear bumper reinforcement beams are made of aluminum alloy.

For this reason, the door, bumper reinforcement beams, and the 1500 MPa parts should NEVER be repaired, and NEVER be welded by MAG welding; they must be replaced by only spot welding and MIG brazing if they are damaged.