1 Series E81 130i (N52K) 3-door
•
Contaminants will otherwise enter the weld pool via the root of the weld seam.
•
An insufficient electron flow prevents an optimum spot-weld joint.
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Coat all metal overlaps and weld spot flanges with welding primer.
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To determine the optimum electrode contact force for spot-welding, carry out spot-weld shear tests on sample
metal sheets.
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In order to keep the electron flow short during MAG welding on the body, you must if possible attach the ground
terminal directly to the component to be welded.
4. Welding
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During MAG welding, the weld gap must be kept as small as possible. The larger the weld gap, the lower will be
the strength of the joint.
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During spot-welding, the metal flanges to be joined must be placed as close together as possible without gaps.
The larger the gap, the lower will be the strength of the joint.
Minimum gap between welding spots 25 mm.
5. Subsequent treatment of weld joints:
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When grinding a weld seam, do not grind thin the base material next to the seam.
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After joining, clean all weld seams and spots with a stainless steel wire brush.
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Remove burnt paint with a stainless steel wire brush.
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All weld joints sealed off with body sealing compound in original state must be primed and sealed off again
thoroughly after repairing. Replace damaged or removed antinoise compounds.
B. Soldering steel parts:
1. General information
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The following procedures are used for repairs:
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Gas brazing
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Tinning
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The MIG soldering procedure is not used in repairs for strength reasons. MIG soldered/brazed seams used in
series production are replaced in repairs by MAG weld seams.
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Areas brazed in vehicle production are joined during repairs with the same procedure.
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It is possible when straightening steel parts to correct irregularities smaller than 2 mm with filler.
If in exceptional cases the irregularities are in excess of 2 mm, these areas must be tinned.
Only visible areas of the outer skin and on the support carrier must be tinned.
All areas which have covers on the vehicle are not to be tinned.
Note:
Only applicable within the European Union!
European used-car regulations prohibit the use of tin containing lead in motor vehicles introduced after
01.07.2003!
RA Welding and soldering steel parts
BMW AG - TIS
22.01.2013 06:25
Issue status (12/2007) Valid only until next DVD is issued
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