Method of fabricating composite multi-metallic billets useful for metal working operations

Claim 1

In the formation of composite multi-metallic billets for the fabrication of selectively clad metal products, the steps of positioning an elongate, hollow open-ended and relatively thinwalled core member of a first predetermined configuration within a closed-end deformable outer shell member of larger transverse dimension and of substantially commensurate length therewith with one open end of said core member disposed in abutting relation with the closed-end defining wall portion of said shell member to define a plurality of powdered metal receiving cavities therein, introducing a first finely divided metal powder material into a cavity defined by and disposed intermediate said core member and said shell member in sufficient quantity to substantially fill the same, introducing a second finely divided metal powder material of metallurgical characteristics different from those of said first powder material into a second cavity disposed within and defined by said hollow core member in sufficient quantity to substantially fill the same, axially removing said core member from said shell member to introduce the particles of said first and second discrete metal powders disposed in abutting relation with the inner and outer surfaces of said core member into intimate interfacially engaged relation without substantial disturbance in the physical positional disposition thereof relative to each other, sealing said deformable shell member. and isostatically said sealed deformable shell member and its contents to hydrostatic pressure to compact said powder metal contents thereof to a predetermined desired density without appreciable change in the relative physical positional disposition of said first metal material to said second metal material.