41 00... Spot-Weld Bonding Steel Parts

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 135i, and 2010 BMW 128i. 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 . Refer to 41 00... Information On Hazards and/or 41 00... Safety At Work .

Handling electrical/electronic equipment, airbags and restraint systems . Refer to 41 00... Handling Airbags And Restraint Systems and/or 41 00... Handling Electrical And Electronic Equipment .

Welding steel parts . Refer to 41 00... Welding And Soldering 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.