For 1990-2009 cars

This information provides repair recommendations and general guidelines for steel classified as Ultra High Strength Steel, also know as UHSS. This type of steel normally has a tensile strength greater than 700 MPa.

#### This includes the common steel names of

• | Ultra High Strength Steel (UHSS)

• | Martensitic Steel (MS)

• | Press Hardened Steel (PHS)

• | Boron Steel

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

Important:

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

• | This type of steel should be replaced only, at factory joints. 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 type of steel can not be used as a backing reinforcement or a sleeve for a sectioning joint.

#### 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.