Cold plate and method of making the same

1 . A cold plate comprising:

a first plate member having a second plate member receiving surface and an opposite heat transfer surface, a cooling fluid inlet and a cooling fluid outlet;

one or more fins machined in said first plate member, each of said one or more fins having a first end integrally formed with said base and a second end spaced from said first end; and

a second plate member having a first plate member engaging surface connected with said base at said cover receiving surface around the entirety of said fins, wherein said one or more fins and said second plate member form a cooling fluid flow channel from said inlet to said outlet.

2 . The cold plate of claim 1 wherein said second ends of each of said one or more fins lie in a common plane.

3 . The cold plate of claim 2 wherein said second ends are in substantial engagement with said second plate member.

4 . The cold plate of claim 1 wherein said second ends of said one or more fins are connected with said second plate member in a sealed relationship.

5 . A cold plate comprising:

a first plate member having a second plate member receiving surface portion;

one or more fluid flow channels formed in said first plate member;

a cooling fluid inlet and a cooling fluid outlet in communication with said one or more fluid flow channels;

a second plate member having a first plate member engaging surface portion connected with said first plate member receiving surface portion by friction stir welding around the entirety of said fluid flow channels.

6 . The cold plate of claim 5 including one or more fins defining said one or more flow channels, each of said one or more fins including a first end integrally formed with said first plate member and a second end spaced from said first end.

7 . The cold plate of claim 6 wherein said second ends of each of said fins lie in a common plane.

8 . The cold plate of claim 7 wherein said second ends are in substantial engagement with said second plate member.

9 . The cold plate of claim 8 wherein said second ends of said fins are connected to said second plate member via friction stir welding.

10 . A method of making a cold plate comprising;

providing a first plate member of a heat conductive material;

providing one or more fins or flow channels in said first plate member; and

connecting a second plate member to a surface portion of said first plate member surrounding said one or more fins or flow channels by friction stir welding.

11 . The method of claim 10 including machining said one or more fins or first plate flow channels from said member.

12 . The method of claim 11 wherein each of said fins has a first end integrally formed with said base member and a second end spaced from said first end.

13 . The method of claim 12 including connecting said cover to said second ends of said fins by friction stir welding.

14 . The method of claim 10 including machining a second plate member receiving recess in said base, positioning said second plate member in said recess and friction stir welding said second plate member to said first plate member along edges of said second plate member and corresponding edges of said recess.

15 . A method of making a cold plate comprising:

providing a first plate member of a heat conductive material;

machining one or more fins or flow channels in said first plate member, each of said fins including a first end integrally formed with said first plate member and a second end spaced from said first end; and

connecting a second plate member to a surface portion of said first plate member surrounding said one or more fins in a sealed relationship.

16 . The method of claim 15 including machining said fins so that said second ends lie in a common plane.

17 . The method of claim 16 including connecting said second plate member to said second ends and to said first plate member by friction stir welding.

18 . A method of forming a hermetically sealed opening through an elongated article comprising:

providing an elongated article;

machining a channel in said article; and

connecting a cover to said article in the area on each side of said channel by friction stir welding.