Spot welds - recommended drill bits ?

[RobPhoboS]

Hopefully over the Christmas period I'm going to start gutting the rear of my car out, ready for a half/roll cage to be welded in next year at some point.
And I'm just wondering for those that have done any spot weld drilling, what bits you used ?
I see very mixed reviews on the little 8mm cutters with teeth, and would rather buy what works.

Cheers for any help !
 

[Sim]

I can't tell you for spot weld but for rivets I always use a regular drill bit, really sharp one, anything dull is a waste of time and just heats up.

[RobPhoboS]

Looks like we get things like this but quality varies (of course):

https://www.amazon.co.uk/Sealey-AK4734-Cobalt-Spot-Drill/dp/B001SG1USG/

https://www.amazon.co.uk/Cutter-Remover-Separator-Welding-Pieces/dp/B08DRR4RZR

I know sometimes places like Machinemart/Screwfix etc sell stuff that looks the same but I've found that the quality is better with some stuff:
https://www.machinemart.co.uk/p/clarke-cht685-spot-weld-cutter-set/

 

[Willsy1980]

You can just grind down a 10mm HSS bit, leave a little point as per the first one you linked  

Never bothered buying a specific bit to do it. Any old 10mm HSS that's dull, rip it down on the bench grinder and drill away.