Corner gringing and smoothing

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I'm having troulbe trying to grind and smooth inside corners. for instance 4x4 steel angle welded to a plate of steel. Angle grinder too big and I've tried a mini die grinder with stone points, but they lose too much of the grinding surface. Is there something else that I can put in the die grinder. I also use flap wheels to smooth the sorface to a shine. This is for furniture and needs to be cleaner that what I have been doing.Ant help would be greatly appreciated.Ryan
Reply:Carbide burrs of all varieties of size and shape are available.  Not to be confused with nearly worthless High Speed Steel type burrs found at HF or Home Depot.  They are fairly expensive for high quality ones, but invaluable for tight places and last a long time if not abused.  The large open flute type are for soft metals (aluminum) and the tighter cross-hatched tooth type are for any type of steel.  When cutting aluminum, use paraffin wax to prevent clogging them up. Other than that, learn to make cleaner welds.  Hobart 140 Handler w/ gasHyperTherm Powermax 380 Plasmaoxy/acetylene
Reply:If inside corners are critical, then you might might want to change welding process.  I don't know what you are using now, but tig or O/A.  Eliminate or minimze the need for cleanup.  Jewlers' files work to clean corners.Prehaps brazing with silver on a close fitting joint. The filler will go where you need it to go.  Prehaps an adhesive (epoxy) would work in the corner, also. You could shape the adhesive prior to drying.  If the inside corner is not providing any support then this would work well.
Reply:Thanks for the Help, I've thought that the carbide burrs are what I need. Along with a better bead. Been MIG welding for about a year. Self taught, some of the metal that I weld is very old and rusty and I do clean them up before I weld, but sometimes they still don't flow right.
Reply:Originally Posted by RyguyThanks for the Help, I've thought that the carbide burrs are what I need. Along with a better bead. Been MIG welding for about a year. Self taught, some of the metal that I weld is very old and rusty and I do clean them up before I weld, but sometimes they still don't flow right.
Reply:I can't control them well unless they are doing better than around 10,000rpm. They seem to grab and jerk me around at low speeds.
Reply:I use a small sandblaster.... hand held no bigger than an impact gun holds about a quart of blast media..... a little messy but it works awesome._________________Chris
Reply:They make an adjustable regulator that goes on the line so you can adjust speed especially if you are using cutting wheels they are rated for a maximum speed.