Gene, Hold the nut with a pair of vice grips so it can't move, use 3/32 6011 or 7014 centering your electrode in the nut so that the arc starts in the center of the bolt, building the puddle in the center of the nut until its 1/2 full, then circle the electrode just a little to get good penetration on the nut in the top 1/2. I have never tried to weld a nut on a sheared bolt less than 3/8 diameter, but have had 100% success on 3/8" and larger sizes. On smaller sized nuts, they will be be so hot by the time you get the first 1/2 filled you probably won't have to circle the hole any to assure good penetration on the nut. The vice grips also help heat sink so that the nut edge doesn't melt on the top 1/2. Let the nut cool until its not showing color, then use your least favorite wrench or socket to first wiggle, move back and forth, and then turn out the broken off bolt by hand, stopping on any resistance and working it back and forth if needed.
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