Front Bumper Reinforcement: Description and Operation

Door and Bumper Reinforcement Beams, and Hot Stamp (1500 MPa) Parts

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

The front inner upper pillar the front pillar upper stiffener the roof side stiffener the center pillar upper stiffener and the side sill stiffener are made from Hot Stamp (1500 MPa) steel.

Hot Stamp: This is a high-strength material manufacturing procedure. A heated steel sheet is press-formed in the metal mold and then quenched to create high-strength 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 Hot Stamp (1500 MPa) parts are bent the beams or the Hot Stamp (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 Hot Stamp (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.