Removing body panel spot welds, the easy way
 

One of the most used / common tools is a Rotabroach

The most used size is 3/8 inch.

Rotabroach Spot Weld Cutter Kit
https://www.google.com/search?q=Rotabroach+Spot+Weld+Cutter+Kit&ie=utf-8&oe=utf-8

https://www.google.com/search?q=Rotabroach+Spot+Weld+Cutter+Kit&source=lnms&tbm=isch&sa=X&ei=Egq_VJKAFI2xyASuyILQCg&ved=0CA kQ_AUoAg&biw=1280&bih=891

FYI: Most automotive prototype shops require mechanics have in your toolbox, and know how to use at least a basic Rotabroach® Cutter Kit like this.
5/16, 3/8, 7/16, 1/2, 9/16, 5/8, & 3/4" Cutters, Arbor, (2) Extra Pilots, & Center Punch

This is the easy way of removing spot welded parts, look at the videos.

https://www.youtube.com/watch?v=lk3s4ucJg7k

https://www.youtube.com/watch?v=P7FrgdyuhVA

https://www.youtube.com/user/blairequip

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good info thank you