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⇒ Body Repairs; Rep. gr. Karosserie ; 00; Technical data
Telescopic gauge
Note
To diagnose accident damage quickly, it is often sufficient to per‐
form a diagonal comparative measurement using a telescopic
gauge.
5.5 Overview of materials used
5.5.1 Special properties of deep-drawn steel
In series production, the vehicle body and floor sections are pri‐
marily manufactured from cold-formed deep-drawn sheet metal
panels. For this reason, the straightening of areas damaged in an
accident should be carried out in the same manner. If the extent
of the damage makes it impossible to straighten the part in this
manner, the damaged part should not be cut out until the adjacent
surfaces have been straightened.
5.5.2 Special properties of high-strength and
ultra-high-strength steel
Extra-high-strength steel body panels are increasingly being used
for Audi vehicles. For an overview of the areas in which these
panels are used, refer to the illustration in the Body Repairs work‐
shop manual ⇒ Rep. gr. 00 .
What are extra-high-strength steel panels?
They look the same as normal steel panels, but they have a higher
yield point than standard steel body panels due to the different
alloys which are used. In other words, when there is an equal
impact on the panel, the dent in an extra-high-strength steel body
panel will not be as deep as that in a standard steel body panel.
What has to be observed when removing dents?
Dents can be removed with the usual tools. Due to the greater
buckling strength, there is more bounce, which means that more
force may be necessary. Material may rupture when kinks are re-
formed.
What has to be observed when straightening panels using a
straightening jig or hydraulic press?
Due to the greater bounce of extra-high-strength steel, it has be
overstretched even more than standard steel to reach the desired
position. However, the greater force applied also increases the
stress placed on those parts made of standard steel which are
welded to the extra-high-strength steel parts. Additional anchor‐
ing is required to prevent the standard steel yielding or rupturing.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
14 5. Assessing damage
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