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) |
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 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. |
