Mercedes-Benz Structural Repair: Aluminum Castings and Mixed Materials

Mercedes-Benz bodies combine steel, aluminum sheet and aluminum castings. Learn why castings are replaced and how mixed-material repairs are done.

Mixed-Material Bodies

Modern Mercedes-Benz vehicles combine several steel grades with aluminum sheet, extrusions and castings. Each material plays a role in stiffness, weight and crash performance, and each requires its own repair approach.

Aluminum Castings

Many Mercedes models use cast aluminum components in areas like suspension towers and structural nodes. Castings can crack under impact and are generally not repairable. When damaged, they are replaced according to the repair procedure.

Joining Methods

  • Self-piercing and blind rivets
  • Structural adhesives
  • Specific steel welding methods
  • Aluminum welding only where specified

Corrosion Isolation

Where aluminum meets steel, coated fasteners and sealers prevent galvanic corrosion. Aluminum work is kept separate from steel to avoid contamination.

Facility Requirements

Some Mercedes-Benz structural repairs are restricted to facilities with specific certification. We review the procedure before starting and let you know if your repair falls into that category.

Frequently Asked Questions

Why can't a cracked casting be welded?

Welding can change the casting's properties and strength.

Are mixed-material repairs more expensive?

Often, due to parts and labor.

How do I know which materials my car uses?

Repair information identifies materials for each part.

See our aluminum repair page.

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