I prefer not to grind a weld if it is not necessary. If the weld has to be blended, I like flap disks like George. For heavy removal, a 36-grit disk on the 4.5 or 7 inch grinder. For welds that need to be dressed for appearance, but are in places where you can't get a disk on them, I like die grinders.
If there's no appearance or clearance issue, I think a well done weld is pretty enough to be flaunted! I just leave 'em alone if there's no issue!
...from the Gadget Garage
MM 210 w/3035, BWE
HH 210 w/DP 3035
Victor O/A "J" series, SuperRange
Avatar courtesy of Bob Sigmon...