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7 Cold joining techniques
7.1 Bonding
Adhesive-bonded joints and spot-welded bonded joints are being
used increasingly at the factory, as they help to improve body
rigidity and strength.
They are distinguished as follows:
♦ In the case of adhesive-bonded joints, the joint between the
sheet metal parts is formed only by the adhesive.
♦ Adhesive-bonded joints with additional spot welds or rivets are
known as hybrid joints.
Note
The bonded joints may only be restored using the materials listed
in the Workshop Manual or parts catalogue.
7.1.1 Making adhesive-bonded joints (alumi‐
nium)
Note
The descriptions below do not replace the Workshop Manual for
the relevant vehicle.
Pre-treatment of old flange
– Remove remnants of adhesive, paint, wax, etc.
– Sand bonding surface down to bare metal using a clean sand‐
ing disk (grain size 80 or 100).
– Treat flanges with silicate sanding stone.
A silicate adhesive layer is formed which ensures long-term du‐
rability of the bonded joint. The surface becomes matt.
– Remove sanding dust with a clean brush (do not use any sol‐
vent).
– Use brush to apply thin coat of aluminium primer and allow to
flash off.
Pre-treatment of flange (on new part):
– Clean painted flange with special cleaner.
WARNING
Mask bonding surfaces when painting inside of new parts.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
7. Cold joining techniques 31
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