Opening welding spots (resistance pressure spot welding)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

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 BMW Aftersales Assistance Portal (ASAP) - Service/Technology - Workshop Equipment.

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. weld spot drill bit on punch mark and drill through top panel.

NOTE: Because the welding spots may have surface-hardened, grind them if necessary with an angle grinder and paper grinding disc.

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

Follow the special procedure for SPOT WELDS .