Amazon.com: 3M Green Corps Reinforced Weld Grinding Wheel 01991, 3 in.22" x 3/8" 5 Pack Heavy Duty, Resin Bonded, Long Lasting Wheel for Fast Cut, Auto Body : Industrial & Scientific
Here's a Quick Tip to Grind a Inside Fillet Weld to a Smooth 90 - Welding & Fabrication - Fireball Forum
Amazon.com: Cenven Upgrade Strip Discs Stripping Wheel for Angle Grinder, Strip Disc Clean and Remove Paint Coating Rust Welds Oxidation (4'' x 5/8'' 10 Pack) : Industrial & Scientific
Flap discs designed for fillet weld applications
The Angle Grinder Wheels You Need for Fabrication - Roundforge
Wire brushes, grinding wheels, and flap discs, oh my!