Assemblies with brazed joints and methods of fabricating assemblies with brazed joints

Patent metadata

Field	Value
Publication number	US-9511452-B2
Application number	US-201514616842-A
Country	US
Kind code	B2
Filing date	Feb 9, 2015
Priority date	Feb 9, 2015
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An assembly may comprise a first part including a first surface, and a second part including a second surface and a bottom edge having sloped regions and at least one well between the sloped regions. The assembly may further comprise a brazed joint joining the first surface to the second surface. The at least one well may be configured to collect excess braze material from the brazed joint.

First claim

What is claimed is:

1. An assembly, comprising:
a first part including a first surface;
a second part including a second surface and a bottom edge having sloped regions and at least one well between the sloped regions;
a brazed joint joining the first surface to the second surface to provide the assembly, the at least one well being configured to collect excess braze material from the brazed joint; and
a collection capillary adjacent to the at least one well, and wherein collection capillary is configured to collect the excess braze material from the at least one well;
wherein the sloped regions are configured to direct a flow of the excess braze material from the braze joint to the at least one well; and
wherein gravity assists the flow of the excess braze material from the braze joint to the at least one well.

2. The assembly of claim 1 , wherein the at least one well is positioned away from braze-sensitive features of the assembly.

3. The assembly of claim 1 , wherein the collection capillary is removable from the assembly.

4. The assembly of claim 1 , wherein the collection capillary is formed integrally with the second part.

5. The assembly of claim 1 , wherein the collection capillary is a structure selected from a hook, a pair of plates, a tube, and a hole in the first part.

6. The assembly of claim 1 , further comprising a braze stop coating on a portion of the first surface of the first part, the braze stop being configured to assist in directing the flow of the excess braze material to the at least one well.

7. A method for fabricating an assembly having a brazed joint between a first surface of a first part and a second surface of a second part, the second part including a bottom edge having sloped regions and at least one well between the sloped regions, comprising:
assembling the first surface with the second surface to define a joint gap there between;
applying a braze filler to the joint gap;
orienting the first part and the second part so that the at least one well is pointed downwardly;
attaching a collection capillary proximal to the at least one well prior to melting the braze filler to a braze liquid;
melting the braze filler to a braze liquid;
allowing the braze liquid to flow through the joint gap;
allowing any excess braze liquid from the joint gap to flow along the sloped regions for collection at the at least one well; and
allowing the braze liquid to cool and harden to provide the assembly having the brazed joint between the first part and the second part.

8. The method of claim 7 , further comprising allowing the excess braze liquid to flow from the at least one well into the collection capillary after allowing the excess braze liquid to flow along the sloped regions for collection at the at least one well.

9. The method of claim 8 , further comprising removing the collection capillary from the assembly after allowing the excess braze liquid to flow from the at least one well into the collection capillary.

10. The method of claim 9 , further comprising reclaiming the excess braze liquid from the collection capillary after removing the collection capillary from the assembly.

11. The method of claim 8 , wherein the collection capillary is a structure selected from a hook, a pair of parallel plates, and a tube.

12. The method of claim 7 , wherein the second part further includes a collection capillary proximal to the at least one well.

13. The method of claim 12 , further comprising allowing the excess braze liquid to flow from the at least one well to the collection capillary after allowing the excess braze liquid to flow along the sloped regions for collection at the at least one well.

14. The method of claim 7 , wherein the first part further includes a hole located proximal to the at least one well.

15. The method of claim 14 , further comprising allowing the excess braze liquid to flow from the at least one well into the hole after allowing the excess braze liquid to flow along the sloped regions for collection at the at least one well.

16. A method for fabricating an assembly having a brazed joint between a first surface of a first part and a second surface of a second part, comprising:
installing sloped regions and at least one well between the sloped regions along a bottom edge of the second part;
assembling the first surface with the second surface such that the at least one well is positioned away from braze-sensitive features of the assembly, and to define a joint gap between the first surface and the second surface;
applying a braze filler to the joint gap;
orienting the first part and the second part so that the at least one well is pointed downwardly;
melting the braze filler to a braze liquid;
allowing the braze liquid to flow through the joint gap;
allowing any excess braze liquid from the joint gap to flow along the sloped regions for collection at the at least one well;
allowing the excess braze liquid to flow from the at least one well into a collection capillary after allowing the excess braze liquid to flow along the sloped regions for collection at the at least one well; and
allowing the braze liquid to cool and harden to provide the assembly having the brazed joint between the first part and the second part.

Assignees

• United Technologies Corp

Inventors

• Pater Christopher M
• Burd Steven W
• Philippona Derk S
• Sayers Robert J

Classifications

• B23K1/0018 Primary

  Brazing of turbine parts · CPC title

• B23K33/00

  Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby · CPC title

• B23K1/20

  Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating · CPC title

• B23K2101/001

  Turbines · CPC title

• B23K1/00

  Soldering, e.g. brazing, or unsoldering (B23K3/00 takes precedence) · CPC title