Drilling Spot Welds, What do you use? Options

[obscurity]

I have been drilling spot welds as I work on my car and it occured to me that there may be a better way (or maybe I am being to picky). I am curious what everyone else uses.

I have been using a spot weld cutter. It looks like a short drill bit with a pilot point and little cutters along the edge. It will cut through the top layer or steel but not the back layer (usually). They will cut about 10 welds before being hoplessly dull. When I was buying them at $5/bit it was fine but that company went out of business and the ones I find now are $25/bit. Are these the right tools to use or should I be just using a drill bit allthe way through the weld.

Any help or tool suggestions would be appreciated. (IMG:style_emoticons/default/smile.gif)

Thanks,
John W.

[jasons]

You know, I found using an air chisel CAREFULLY worked better than a spot weld bit. Or, using a small cut off wheel to grind down the spot weld, then pop it with the air chisel. Once you get the seam lifted up a little, the air chisel just pops it away, leaving a minimal amount of weld to clean up.

I must stress the word CAREFULLY. You can do a lot of damage with the chisel if you aren't careful.

BTW, if you are dulling them, maybe you are turning them too fast. Also, a touch of oil on the bit before you drill might help too.