Method for making metallic sandwich structures

Details Method for making metallic sandwich structures Method for making metallic sandwich structures

B - Operations, Transporting

23

K

26/147

B23K 31/02 (2006.01)

Patent

CA 1052081

ABSTRACT A method for fabrication of metallic sandwich struc- tures in which metal blanks, preferably of a titanium alloy, are joined at selected areas and expanded superplastically to form a desired sandwich structure. Various techniques for joining, preferably diffusion bonding, selected areas of the metal blanks are disclosed. These include treating the metal blanks at selected areas to prevent bonding at those areas and selective application of pressure during bonding. In the pre- ferred embodiment, the metal blanks are positioned in a stack after being treated at selected areas. The stack is positioned relative to shaping members and heated to a temperature suitable for superplastic forming and diffusion bonding. Compressive pressure is applied for the selective diffusion bonding. The stack is expanded into contact with the shaping members by increasing the internal pressure therein, preferably with inert gas, thus forming the desired shaped sandwich structure in one operation.

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