Page created by T Nov 4th 2012:
Is an extra heating process that is performed on an item to relieve internal Stresses.
Requirement For Normalising:
Unwanted Stresses appear in Metal Items during the welding process. In order to make the Item retain its Shape, Normalising is performed. Exhaust Systems may buckle after initial use and can no longer be rebolted to the Engine properly if they haven't been normalised.
Typically the exhaust manifold is bolted to a jig, reheated to a particular temperature, then allowed to cool. After the cooling process is complete the manifold has become stress relieved and can be refitted to the jig easily.