It should also be possible to repair a broken item - doing so shouldn't require any more metal but should reduce the item's quality, unless it's been named/is an artifact, at any rate.
I'd be tempted to say that the repairing by a dabbling smith would repair a no-quality weapon completely fixed, but could actually irrevocably
break a masterwork one.
Or certainly reduce one to a needs-fixing item of lower intrinsic quality... In which case a
more expert repairer might even be able to
up the associated quality tag. Not to artefact[1], but certainly there's a chance that a Legendary smith could refine your broken no-quality sword. Might encourage use of lesser weapons, that your lesser/unluckier smiths managed to create, so that they can get a bit damaged and then reworked
possibly into better weapons.
(MrWiggles: You're right, but perhaps a little harshly put. We don't know how hardy these new people are, and this one
might take that the wrong way and take your welcome as sarcastic.)
((jpvlsmv: Basically, you might imagine we've seen a lot of similar suggestions before. The "DF Suggestions" board is one place where searching for what you thought you might post and then resurrecting a long-dead thread already mentioning your idea to
add your own take to it is not only not a bad thing, but actually the
best thing you can do. However, welcome.))
(((Anybody: You'll note that I haven't actively searched for past posts myself, even though I have a vague recollection of saying something similar to what I wrote up above before. Now we've
got a newer thread, I thought I might as well say something relevant while it was at the forefront of people's consciousness.)))
[1] Unless it's now named? I could imagine (for a
very low chance) a named sword being improved even into Artefact status. And either that artefacts
can be damaged, or all kinds of other analogues about "The sword that was broken is now mended", and thus becoming more famed than it was originally, and other LOTR-ish clichés.