10
Joining technology
The key to optimizing the body structure is using "the right
materials in the right place". The resulting challenge for
the joining technology was to develop universal and reliable
solutions for the large variance in material/thickness com-
binations in the body. On the TT, Audi uses "cold" joining
techniques such as riveting, ow-drill screwing and clinch-
ing to create the aluminum/steel hybrid structure.
Adhesive is also used to strengthen the connection and to
prevent contact corrosion of the aluminum/steel joint.
The body is constructed using the following types of joining
methods:
• 3020 spot welds.
• 1113 punch rivets.
• 44 solid punch rivets.
• 128 ow-drill screws.
• 199 clinching points.
• 6.23 ft (1.9 m) of MIG/MAGwelds
(metal inert gas/metal active gas).
• 16.07 ft (4.9 m) of laser-welded seams.
• 249.34 ft (76 m) of adhesive.
Joining methods used on the Audi TT
Laser welding
Bonding
Resistance spot welding
Semi-tubular punch riveting
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