Mild Steel
This information provides repair recommendations and general guidelines for steel classified as Mild Steel. This type of steel
normally has a tensile strength less than 270
MPa. This includes the common steel names of:
• Mild Steel
• Bake Hardenable Steel (BH)
• Solid Solution Strengthened Steel
General Motors recommends the following when repairing or replacing this type of steel during collision repair.
Recommended Repairs
• Cold repairs can be performed on this type of steel, unless the damage includes kinks. If the damage includes kinks, the
part should be replaced.
• Controlled use of heat can be used to repair damage, if the heat does not exceed 650°
C (1200°
F). The heat should be
applied a maximum of 2
times, for up to 90
seconds.
• Sectioning or partial replacement of this type of steel is recommended only at approved locations, in a specific sectioning
procedure.
• This type of steel can be used as a sleeve, or backer plate, when recommended in a specific sectioning procedure.
• Squeeze resistance spot welding can be used to replace factory spot welds, where applicable
• MIG plug welding and MIG stitch welding can be used on this type of steel.
• MIG brazing can be used on this type of steel.
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Collision Repair
BODY REPAIR
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CHEVROLET SONIC 2012 BODY REPAIR MANUAL