Ultra High Strength Dual Phase Steel

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.

Special Tools and Equipment