Audi A6´05 323 Service page 9

In addition to classic resistance spot welding, the
following connecting techniques are used on the
new A6´05 body shell:
– Spot welding bonding
– Punch riveting
– Clinching (bonnet & rear opening hood)
– Laser soldering
– Laser welding
– as well as MIG soldering
The Aluminium components are joined to the
galvanized steel sheets by means of punch rivets
and by bonding.
Spot welding bonding
Laser
MIG soldering
The roof and side panel frame are joined by
laser-soldering.
Poorly accessible components are joined by
laser-welding.
The laser-welding head is smaller and thus has
greater flexibility than comparable spot welding
tongs.
In addition, the weight can be reduced by reducing
the flange widths.
MIG soldering is used for closed sectional bars
which are only accessible from one side,
e.g. longitudinal floor members.
Spot welding bonding, using a high-strength
structural adhesive, is used for particularly
crash-relevant and rigidity determining connections
(length of the bonded seam factor 3 compared with
predecessor).
These aluminium-steel connections are used on the
following parts in the body:
– in the plenum chamber front panel
– sill reinforcement (with aluminium extruded
section)
– rigid rear panel with rear shelf
Roof
323_002
Laser-soldered zero joint
Outer side part
323_003
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