Joined: May 2004
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From: Berkeley, CA, USA, Earth
Bikes: Bridgestone 450, A Camera, 46x18 Fixed Gear, Homebrew Tandem
Depends on the lump and what you expect the weld to look like, but it is typical to file or grind welds smooth. If it is really an ugly weld, it may be not very strong (pretty weld=stong weld).