41 00... Spot-Weld Bonding Steel Parts

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Comply with the following topics from "Body, General":
Safety regulations . See 4100... SAFETY AT WORK or 4100... INFORMATION ON HAZARDS .
Handling electrical/electronic equipment, airbags and restraint systems . See 4100... HANDLING AIRBAGS AND RESTRAINT SYSTEMS or 4100... HANDLING ELECTRICAL AND ELECTRONIC EQUIPMENT .
WELDING STEEL PARTS .

The spot-weld bonding process is used starting from the E65 to increase vehicle rigidity. In partial bodywork areas, a 1-component adhesive is applied to the spot flanges and this is followed by resistance pressure spot welding. The adhesive is hardened only after the paint drying process (at approx. 180°C).
In the case of repairs, adhesive is not applied to the spot flanges. The number of welding spots is doubled as a substitute for the omitted adhesive.
The following processes are used as a substitute for spot-weld bonding:
- MAG welding (M etal A ctive G as welding)
- Resistance pressure spot welding (referred to in the following and in the repair instructions as spot welding).
Adhesive is not applied between the spot flanges on new parts in the case of 2- or multi-sheet joints. Areas which cannot be reached by the spot-welding tongs can be joined by MAG spot welding. The number of welding spots is doubled as a substitute for the omitted adhesive.
Exceptions (e.g. E65) are described in the relevant repair instructions. Apply welding spots to existing welding spots on new part. This is necessary because the adhesive between the spot flanges of the new part acts as an insulator.
CAUTION: Extract smoke and fumes during welding work.