I think we are talking about the same thing. Here is an example of what I use from Harbor Freight: http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=44973
A friend introduced them to me after he did some welding for me. They take down the excess weld, and do not damage the metal around the weld like a regular grinding wheel would (especially if I was operating it). So I would not say they are overly agressive, it does take a while for the disk to take down the weld. But they are easy to use.