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