it depends on the damage
if cracked and depending on where the crack is the can weld them up
bad gutter rash they re weld up and re machine
bent they can re roll depending on how bad the bend is
give Craig at Trackside Race & Rally Tyre Service in Kilsy Melbourne a call on 03 9761 557
he get a lot of damaged rims repaired for customers
tell Steve P. told you to call him
cheers
Steve