Steel frames I've had repaired:
1. Kona Hot: bent dropout replaced. Damaged brake boss replaced.
2. Brodie Sovereign: chainsuck crack repaired. Canti brake cable stops removed and disk brake mount added as well.
3. DMR Trailstar: Possible cracking at headtube/toptube junction reinforced and re-welded.
I also have a DeKerf Mountain frame that had the brake bosses replaced (sloppily

) before I got it.
Aluminum repair: Specialized Stumpjumper M2 dropout repaired. No welding, just machined down to accommodate a different derailleur hanger after damage to the original.
Looks like my road bikes have held up nicely in comparison!