For 1990-2009 cars

This information provides repair recommendations and general guidelines for steel classified as Ultra High Strength Dual Phase Steel (Dual Phase Steel with a tensile strength greater than 800 MPa), also known as DPX.

General Motors recommends the following when repairing or replacing this type of steel during collision repair.

Note:

• | Repair of this type of steel is not recommended.

• | This type of steel should be replaced at factory joints only. Sectioning or partial replacement is not recommended.

• | The use of heat to repair damage is not recommended for this type of steel.

• | Stitch welding is not recommended for this type of steel.

• | This classification of steel can not be used as a backing reinforcement or a sleeve for a sectioning joint, unless a specific procedure is available.

#### Recommended Repairs:

• | Squeeze resistance spot welding can be used to replace factory spot welds, where applicable.

• | MIG plug welding can be used to replace factory spot welds.

• | MIG brazing can be used to replace factory spot welds.