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9 Surface repairs
Note
Always pay attention to anti-corrosion materials on inside when
performing dent removal work.
9.1 Dent removal techniques for sheet steel
9.1.1 “Classic” dent removal procedure (with
paint damage)
The classic procedure for removing dents (with hammer and
counterholding) is now only rarely used on modern vehicle bod‐
ies.
Disadvantages of this technique are its limited area of application
(design-related) and the overstretching of the material inherent in
this method. The resulting excess material often has to be shrunk
thermally, which in turn has major disadvantages in terms of ma‐
terial strength and corrosion protection.
9.1.2 “Pressing” dent removal procedure (no
paint damage)
This removal technique for dents without paint damage is mostly
used for minor damage caused by parking incidents or hailstones.
The dent is pressed gently outwards from the inside using circular
movements in multiple stages around the centre of the dent; this
enables the dent to be straightened out without any cracks form‐
ing in the paintwork.
A - Example of a pressing set
9.1.3 “Pulling” dent removal procedure (work‐
ing from the outside)
This dent removal procedure, which is performed working from
the outside, is used both as a bonding technique with no paint‐
work damage and as a technique with paintwork damage. In this
procedure, pulling tabs/pins (or similar) are welded on. The choice
of which technique to use depends on the type of damage. Both
techniques involve pulling the dent out of the panel from the out‐
side. The slowness of the re-forming process means that the
amount of tension caused in the material structure is significantly
reduced. For this reason, the technique is also referred to as
“gentle” or “shock-free” re-forming.
These dent removal techniques have the following advantages:
♦ Reduced material overstretching
♦ Minimal damage to anti-corrosion material
♦ Little removal/assembly work required on vehicle
♦ Original joint is maintained (unlike if components are renewed)
General InformationBody Repairs, General Body Repairs - Edition 04.2018
9. Surface repairs 51
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