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8.4 Milling
In body repairs, milling work is performed using either a spherical
cutter -A- or a BTR cutter -B-.
Spherical cutters are used to loosen spot welds if, due to lack of
space, it is not possible to use a BTR cutter to do so.
When working with the BTR cutter, it is important to ensure that
the blades remain straight in the high-strength steel. The blades
can break easily as they become harder; you should therefore
always perform the work with a suitable tool (do not use a hand-
held drill).
8.5 Separating bonded joints
Bonded joints on the body can be separated by applying heat.
The adhesives used during vehicle manufacture and repairs are
destroyed at temperatures between 180 and 200°C.
WARNING
Toxic gases are generated when separating bonded joints; it
is therefore important to ensure good ventilation and suitable
extraction of smoke in the area where work is being performed.
8.6 Pulling out rivets which are only acces‐
sible from one side
Work sequence
– Remove paint and oxide layer from rivet head and attachment
point for earth clamps.
– Attach earth clamps as close as possible to rivets.
– Weld on weld stud to rivet.
– Pull out rivet using weld stud and specified tools.
Note
For information on tools and materials, refer to the Workshop
Manual for the relevant vehicle.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
50 8. Separating techniques in body welding; areas of application
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