Mercedes-Benz Body & Equipment Guideline for Metris - BM 447, Version November 27, 2015.
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Please observe the revision notes compared to 09/18/2015 ! Only print out complete sections of the current version!
56
6.2 Welding work
6 Damage prevention
6.2
Welding work
a
WARNING
Welding in the vicinity of the restraint systems (air-
bag or belts) can cause these systems to no longer
function correctly. Welding is therefore not permit-
ted in the vicinity of the restraint systems.
a
WARNING
Welding work that is not performed correctly could
lead to failure of components relevant to safety. It
would then not be possible to rule out the risk of an
accident. For this reason, the following safety pre-
cautions must always be observed during any work
involving welding:
•
Welding work on the vehicle may only be carried
out by trained personnel.
•
Before carrying out welding work, components
which may contain flammable or explosive gases -
e.g. the fuel system - must be removed or protected
against sparking with a fire-resistant covering.
Components which are damaged by sparking during
welding work must be replaced.
•
Before welding operations in the vicinity of the seat
belts, airbag sensors or the airbag control unit,
these components must be removed for the dura-
tion of the work. You will find important information
about handling, transporting and storing airbag
units under 7.4 “Interior” (
•
Before welding, cover springs and air suspension
bellows to protect them from welding spatter. Do
not touch springs with welding electrodes or weld-
ing tongs.
•
No welding work must be carried out on major
assemblies such as the engine, transmission, axles,
on the lower flange of the frame or on the A-pillar
and B-pillar.
•
Disconnect the positive and negative terminals
from the battery and cover them.
•
Connect the welding-unit ground terminal directly
to the part to be welded. Do not connect the
ground terminal to assemblies such as the engine,
transmission or axles.
•
Do not touch electronic component housings (e.g.
control units) and electrical lines with the welding
electrode or the ground terminal of the welding
unit.
•
Weld only with electrodes connected to the positive
terminal of a direct current source. Always weld
from bottom to top.
•
The maximum current may be 40 A per mm of elec-
trode diameter.
•
Use only completely dry basic-coated electrodes
(diameter 2.5 mm).
•
Gas-shielded welding is possible.
•
Only use welding wires with a thickness of between
1 mm and 1.2 mm.
