The effect of aging, mainly is to reduce and eliminate the mechanical stress produced by casting, welding and machining parts.
The mechanical parts on the limitation of natural ageing is to need the casting blank or machining parts, welding parts, placed in natural state (such as outdoor, water, etc.), after a long time to release natural stress, to reduce and eliminate the stress, the stable performance of components. Natural aging need a longer time.
There will be limitation of artificial aging is machinery parts casting blank or machining parts, welding parts, with the methods of heating, cooling, vibration, stress release method to make machine parts. Artificial aging need time is shorter.