Drillling & Tapping MIG Weld

pishta said
Try the hard stuff but you could always use a thread-sert in a larger hole. Wont hurt to try. Isnt MIG weld very brittle? I can barely tap cast iron with crap taps.

You know why? Because most "crap taps" are made from cast steel, or even sometimes cast iron. That's why they wear out so fast and or break easily.