Opening Welded Connections (M3 Base, M3 Competition, M3 Competition M xDrive, M3 CS)

Components made of steel:
1. 1.1 Opening welding 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 welding spots be drilled out on these sheet panels
  
  Use BTR/BOR milling cutters only in conjunction with Vario Drill spot-weld remover. Sourcing reference for spot-weld remover and BTR/BOR milling cutters, see Aftersales Assistance Portal (ASAP) - Service/Technology - applicable BMW Workshop Equipment (Start BMW) - Shop applicable BMW Workshop Equipment or at www.bmwgroup-wep.com
  - Procedure:
  If necessary, surface-grind existing unevenness with a belt or angle grinder in the area around the welding spot
  
  Set punch mark in center of welding spot. Set 8 mm dia. welding spot drill bit on punch mark and drill through top metal sheet
  
  NOTE: Because the welding spots may have surface-hardened, grind them if necessary with an angle grinder and paper sanding blade
  
  Use a chisel to separate the sheet metal flange and remove the component
  
  Follow the special procedure for SPOT WELDS .
2. 1.2 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. 1.3 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 blade 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
Components made of aluminum:

2.1 Opening MiG weld seams:

Procedure:

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

Do not use a chisel

Remove component