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The thing is that those welds are already smooth.
The good thing about emery cloth is that goes round curves like if you were using a fabric cloth, specially after some use, so it really copies the shape of the tubes.
I guess that power belt file could be a good starting point when the welds are really rough.
ElGato
This is the kind of tool Cannondale use to smooth their welds -
http://www.silverlinetools.com/en-GB/Products/Power%20Tools/Sanders%20and%20Polishers/247820