What's the application?
For the price of "good" carbide drill bt you can probably buy a new blade.
If your just experimenting (and you except the repsonsibility suggested by Chipmaker), heat the blade in the area with the torch to a deep straw color and let it cool very slow, this will draw the temper (soften it). After you drill it, heat the whole blade up cherry red and quench it in oil (if you don't have a high temp quenching oil, becareful, it may catch on fire and burn you and/or your property!). After it has cooled, place it in a cold oven and turn the temp to 450 for 3 to 4 hours (I made some blades out of leaf springs and at 450 for two hours gave a rockwell hardness of 57 - 60- good for knives, bad for lawnmowers).
I would buy a new blade.
Hobart Handler 175
Welding with 0.030 solid wire
You know what they say, "The early worm gets eaten by the bird".