Repair Metal 2014
2nd-level transmutation
Deep Magic: clockwork A damaged construct or metal object regains 1d8 + 5 hit points when this spell is cast on it.
At higher levels
The spell restores 2d8 + 10 hit points at 4th level, 3d8 + 15 at 6th level, and 4d8 + 20 at 8th level.
Source: Deep Magic Extended (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details