Audi A8 D5 - Separating Techniques in Body Welding; Areas of Application; Drilling; Saw-Cutting; Grinding

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8 Separating techniques in body weld‐
ing; areas of application
8.1 Drilling
Drilling is used to loosen spot welds and rivets. When performing
drilling work, you must make sure that the components located
behind are not damaged. When loosening two-layer and multi-
layer welded joints, the panel remaining on the vehicle must not
be weakened any more than is necessary. Remove (vacuum up)
all metal particles carefully from cavities after performing drilling
work.
8.2 Saw-cutting
Two different types of saw are commonly used for saw-cutting
work:
♦ Short-stroke pneumatic saw
♦ Oscillating saw
Short-stroke pneumatic saws have the following advantages:
♦ Cutting is performed quickly.
♦ Radius sawing is possible.
♦ Can also be used for very angled profiles.
Oscillating saws have the following advantages:
♦ Clean, straight cuts.
♦ Low penetration depth makes them particularly suitable for
two-layered panels.
Note
Remove (vacuum up) all metal particles carefully from cavities
after performing sawing work.
8.3 Grinding
Grinding can be a very useful alternative to drilling, especially
when loosening high-strength welded joints. Grinding can be
used very effectively to loosen spot welds, laser-welded joints and
brazed joints. Again, it is important to ensure that the materials
located behind are not weakened or damaged any more than is
necessary.
Disadvantages of grinding:
♦ Due to flying sparks, extensive safety precautions on and
around the vehicle are necessary.
♦ Higher temperatures are generated than during drilling; this
results in more damage to the remaining material and the anti-
corrosion material.
General InformationBody Repairs, General Body Repairs - Edition 04.2018
8. Separating techniques in body welding; areas of application 49