Given the ever more stringent environmental requirements being placed on motor vehicles, efforts are underway to reduce fuel consumption, and hence CO2 emissions, to the greatest extent possible. One approach is to give the motor vehicle as lightweight a design as possible. To this end, increasing use is being made of light metal components. These components are frequently fastened to the vehicle body via adhesive bonding, with the latter normally being made out of steel.
DE 103 600 350 A1 describes a problem that arises therefrom. It is the result of the various painting and subsequent drying processes that a motor vehicle must go through during its manufacture. In motor vehicles with a steel body and a roof made out of a light metal, the adhesive bond may experience warpage, for example bulging effects in the vehicle roof, which are caused by the differing thermal expansion behavior of the materials.
DE 103 60 350 A1 proposes a method for manufacturing a motor vehicle in which the production processes leading up to a finished adhesive bond between a roof module and a body module can be controlled in such a way as to preclude warpage owing to differing thermal expansion behavior to the greatest possible extent.