Yes my experience with grinding disc's flap wheels ect is the amount of foreign matter they leave on the material, Next to a Stainless steel brush the carbide tool is the best way i have found to clean up aluminum for welding. My cutoff saw has a Non Ferous saw blade in it and leaves a clean cut that just requires acetone.
PowerTig 200DX
Supercut 50P
PowerTig Micro 185 SOLD GREAT MACHINE
Millermatic 200
Miller Thunderbolt
Jet 1340 Lathe
Jet 20" Drill Press
Jet 12" Wet Band Saw
Kalamazoo H7 Bandsaw
Forward 12,000 lb 4 Post Lift