Patent ID: 8966759
Filing Date: 2015-03-03
Classification: B23K,F28F,H01L,Y10T

Abstract:
1. A method of making a fluid cooled assembly, comprising: (a) providing a base that forms a partial enclosure defining an interior void space and having a top wall that has a top surface and that defines at least one opening through said top wall to said void space, said base further defining fluid entrance and exit ports into said void space, said top wall being made of material that can be friction stir welded; (b) providing a lid having a size and shape substantially conformal to said opening, having a top surface that is, inward from the margins, made of a first material that has a coefficient of thermal expansion between 10 and 17 ppm/° C. and which, at the margins, is formed of a second material that can be friction stir welded to said base, wherein the first material cannot be friction stir welded and is not exposed to said friction stir welding and said second material encompasses the entire area to be friction welded, and wherein the margins are defined as encompassing the circumferential edge of the top surface of the lid to an area spaced therefrom; and (c) placing said lid into said opening so that said lid top surface is flush with said top surface of said base top wall and friction welding said lid to said base.