Patent ID: 8327910
Filing Date: 2012-12-11
Classification: B22D

Abstract:
1. A method of forming a bi-layered metallic structure, the method comprising: positioning a first stop within an interior opening of a metal tube adjacent a first axial end of the metal tube; filling the interior opening of the metal tube with a granular material; positioning a second stop within the interior opening of the metal tube adjacent a second axial end of the metal tube such that the granular material is disposed between the first stop and the second stop; attaching the first stop to the second stop together with a tensile connector; compressing the granular material within the interior opening of the metal tube between the first stop and the second stop; and overcasting a cast metal onto the metal tube while the granular material is under compression to radially support the metal tube such that any compressive forces exerted during overcasting the cast metal onto the metal tube are transferred through the metal tube and into the granular material to prevent collapse of the metal tube.