I can't resist showing this set of fotos from a custom frame builder. Now this is not welded construction but is about as fine work as you will see in frame fabrication.

SSWC08 Team Bikes - a set on Flickr

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LennyHarp of Lenny's Bikes & Things
http://lennyharp.net
The true value of a man is not judged by what he has, but rather by what he can do without.
"We are what we repeatedly do. Excellence, then, is not an action, but a habit." -- Aristotle