41 00... Opening Welded Connections

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

1. Opening weld spots (resistance pressure spot welding)

Sheet steel panels made from high- and super-high-strength materials make great demands on the tools used.

Only with special carbide milling cutters can weld spots be drilled out on these sheet panels.

Use BTR/BOR milling cutters only in conjunction with Vario Drill spot-weld remover

Shop Workshop Equipment
- Procedure:
  If necessary, surface-grind existing unevenness with a belt or angle grinder in the area around the weld spot.
  
  Set punch mark in center of weld spot. Set 8 mm dia. weld spot drill bit on punch mark and drill through top metal sheet.
NOTE: Because the weld spots may have surface-hardened, grind them if necessary with an angle grinder and paper grinding disk.

Use a chisel to separate the sheet metal flange and remove the component.

Follow the special procedure for SPOT WELDS .

2. Opening MAG weld seams and MIG brazing seams

Procedure:
Grind off weld seams with a belt or angle grinder. Do not grind the base material thin.

Use a chisel to separate the sheet metal flange and remove the component.

3. Opening laser weld seams

Laser weld seams are used in the roof outer skin area.

Procedure:
Roughly cut roof outer skin in the roof channel to improve accessibility.

Place angle grinder with grinding disc on laser weld seam and grind through top metal sheet. Be careful not to cut through and damage sheet metal underneath.

Remove sheet metal flange.