Weld

This spell repairs a break in a metallic object you can see within range, such as a broken chain link, two halves of a broken key, a broken door hinge, or a damaged shield. This spell has a dc of 10 (+2 for every 10ft away from object) and at the discretion of the dm a secondary roll of 1d20 determines the quality of the weld completed and how nice it looks

This spell can physically repair a magic item or construct, but the spell can't restore magic to such an object.