3 Series E46 316i (M43TU) SAL
41 00 ...
Welding of galvanized plates
Hot galvanized and galvanized sheet metal is used to a greater extent for components of the body, which are especially
subject to corrosion.
Conformance with the following points is necessary when working with these parts.
-
The welding smoke contains poisonous zinc oxide, so that especially good extraction is necessary in the welding
bay.
-
Do not grind off zinc coat for resistance spot welding and inert gas welding. The zinc coat must be ground off for
brazing jobs.
-
If at all possible, welded connections should be made with resistance spot welding. Increase welding current by at
least 10
%
over value for non-galvanized plates. Apply highest possible electrode contact force (make break out
test on sample sheet metal). A coat of spot welding paste can be applied for better sealing.
-
Inert gas welding should be preferred to autogen welding in areas not accessible for resistance spot welding,
because of the lower heat dispersion.
-
Machining or forming of galvanized sheet metal in warm state is normal. Make sure that extraction of poisonous
vapours is carried out thoroughly.
-
Remove burnt residual zinc completely. Align, grind down and tin out visible joints as normal.
-
Coat ground-off zinc coat with zinc dust paint.
RA Welding of galvanized plates
BMW AG - TIS
19.01.2013 14:00
Issue status (12/2007) Valid only until next DVD is issued
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