Flux-cored brazing preform

Patent metadata

Field	Value
Publication number	US-10086477-B2
Application number	US-201414551596-A
Country	US
Kind code	B2
Filing date	Nov 24, 2014
Priority date	Nov 24, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Embodiments of the present invention are directed to flux-cored brazing consumables and preforms which have at least one protrusion which extends from an outer surface of the consumable such that the protrusion engages with a surface of a component to be brazed. The protrusion aids in securing the brazing consumable in position during manufacture, assembly and transport of an assembly to be brazed, prior to a brazing operation.

First claim

What is claimed is:

1. A brazing consumable, comprising:
a flux core, and
a hollow metallic sheath which surrounds said flux core such that said metallic sheath has a longitudinally-extending seam extending between an interior surface and an exterior surface of said sheath through which at least some of said flux core passes when said brazing consumable is heated;
wherein said sheath has said exterior surface configured such that said consumable has a cross-sectional shape which is generally circular for a portion of a perimeter of said cross-sectional shape,
wherein said exterior surface has a first protrusion, having a triangular cross-sectional shape with respect to a longitudinal axis of said consumable, and a second protrusion having a different triangular cross-sectional shape than said first protrusion, wherein said first protrusion and said second protrusion extend outward from said exterior surface, and wherein said seam is located between said first protrusion and said second protrusion,
wherein said first protrusion and said second protrusion have respective distal edges that extend away from said exterior surface to engage a work piece to be brazed, so as to provide a gap between the seam and the work piece,
wherein respective centerlines of said first protrusion and said second protrusion do not pass through a cross-sectional geometric center of said consumable, and
wherein each of said first protrusion and said second protrusion have a respective side wall that extends generally tangentially from said exterior surface of said sheath.

2. The brazing consumable of claim 1 , wherein said respective distal edges are distal endpoints of said triangular cross-sectional shape and said different triangular cross-sectional shape.

3. The brazing consumable of claim 1 , wherein at least 50% of the perimeter of said exterior surface is generally circular.

4. The brazing consumable of claim 1 , wherein said first protrusion has a height which is in the range of 25 to 125% of the thickness of the sheath as measured at a point remote from said first protrusion.

5. The brazing consumable of claim 1 , wherein said second protrusion is positioned on said exterior surface opposite from said first protrusion.

6. The brazing consumable of claim 1 , wherein said exterior surface is generally flat between said first protrusion and said second protrusion.

7. A brazing consumable, comprising:
a flux core, and
a hollow metallic sheath which surrounds said flux core such that said metallic sheath has a longitudinally-extending seam extending between an interior surface and an exterior surface of said sheath through which at least some of said flux core passes when said brazing consumable is heated;
wherein said sheath has said exterior surface configured such that said consumable has a cross-sectional shape which is generally circular for a portion of a perimeter of said cross-sectional shape,
wherein said exterior surface has a first protrusion, having a triangular cross-sectional shape with respect to a longitudinal axis of said consumable, and a second protrusion having a different triangular cross-sectional shape than said first protrusion, wherein said first protrusion and said second protrusion extend outward from said exterior surface to engage a work piece to be brazed so as to provide a gap between the seam and the work piece, and wherein said first protrusion and said second protrusion have respective distal edges which are located outside of an imaginary circle which has a radius and centerpoint which is the same as a maximum radius and centerpoint of said generally circular portion of said sheath,
wherein said seam is located between said first protrusion and said second protrusion,
wherein respective centerlines of said first protrusion and said second protrusion do not pass through a cross-sectional geometric center of said consumable, and
wherein each of said first protrusion and said second protrusion have a respective side wall that extends generally tangentially from said exterior surface of said sheath.

8. The brazing consumable of claim 7 , wherein at least 50% of the perimeter of said exterior surface is generally circular.

9. The brazing consumable of claim 7 , wherein said first protrusion has a height which is in the range of 25 to 125% of the thickness of the sheath as measured at a point remote from said first protrusion.

10. The brazing consumable of claim 7 , wherein said second protrusion is positioned on said exterior surface opposite from said first protrusion.

11. The brazing consumable of claim 7 , wherein said exterior surface is generally flat between said first protrusion and said second protrusion.

12. The brazing consumable of claim 7 , wherein said first protrusion is positioned remotely from said seam along said exterior surface of said sheath.

13. A brazing preform assembly, comprising:
a work piece to be brazed having an outer cross-sectional shape; and
a brazing consumable, where said brazing consumable comprises:
a flux core, and
a hollow metallic sheath which surrounds said flux core such that said metallic sheath has a longitudinally-extending seam extending between an interior surface and an exterior surface of said sheath through which at least some of said flux core passes when said brazing consumable is heated;
wherein said sheath has said exterior surface configured such that said consumable has a cross-sectional shape which is generally circular for a portion of a perimeter of said cross-sectional shape,
wherein said exterior surface has a first protrusion, having a triangular cross-sectional shape with respect to a longitudinal axis of said consumable, and a second protrusion having a different triangular cross-sectional shape than said first protrusion, wherein said first protrusion and said second protrusion extend outward from said exterior surface to engage the work piece to be brazed so as to provide a gap between the seam and the work piece, and wherein said first protrusion and said second protrusion have respective distal edges which are located outside of an imaginary circle which has a radius and centerpoint which is the same as a maximum radius and centerpoint of said generally circular portion of said sheath;
wherein said seam is located between said first protrusion and said second protrusion,
wherein respective centerlines of said first protrusion and said second protrusion do not pass through a cross-sectional geometric center of said consumable,
wherein each of said first protrusion and said second protrusion have a respective side wall that extends generally tangentially from said exterior surface of said sheath, and
wherein said brazing consumable is shaped to couple said brazing consumable to said outer cross-sectional shape of said work piece and secure said brazing consumable to said work piece.

14. The brazing preform assembly of claim 13 , wherein said brazing consumable is shaped such that said seam is positioned facing a surface of said workpiece.

15. The brazing preform assembly of claim 13 , wherein said exterior surface is generally flat between said first protrusion and said second protrusion.

Assignees

• Lincoln Global Inc

Inventors

• Howard Robert A

Classifications

• B23K35/0266

  flux-cored · CPC title

• B23K35/362

  Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) · CPC title

• B23K35/001

  Interlayers, transition pieces for metallurgical bonding of workpieces · CPC title

• B23K35/0272

  with more than one layer of coating or sheathing material · CPC title

• B23K35/0227

  Rods or wires (B23K35/0244 takes precedence) · CPC title