Method for applying braze end isolation layer for generator armature winding bar
First Claim
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1. A method of forming a brazed joint between an end of an armature bar and a hydraulic header clip comprising:
- a) locating ends of a plurality of hollow strands and a plurality of solid strands of the armature bar within a cavity in an end fitting of the hydraulic header clip, such that free ends of said hollow strands extend axially beyond free ends of said solid strands;
b) pre-placing an essentially phosphorous-free silver braze alloy around and between said ends of said hollow strands and said solid strands such that said braze alloy extends axially beyond the free ends of said solid strands;
c) vertical orienting the plurality of hollow strands and the plurality of solid strands in the cavity of the end fitting, such that the free ends of the hollow strands are at a higher elevation than the free ends of said solid strands;
d) positioning in a braze chamber the hydraulic header clip and the end of the armature bar, wherein the end of the armature bar and hydraulic header clip are adjacent an induction heating coil of the braze chamber;
e) while the hollow strands and the vertical strands are vertically oriented, induction heating the phosphorous-free silver braze alloy to at least a liquidus temperature of the alloy and coating the free ends of said solid strands with the alloy, wherein the ends of said hollow strands remain free of the braze alloy during the induction heating step;
f) the induction heating step is performed in a controlled gas atmosphere which is substantially free of oxygen in the braze chamber, andg) cooling the heated phosphorous-free silver braze alloy and forming a layer of the cooled braze alloy over the ends of said solid strands.
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Abstract
A method of forming a brazed joint between an armature bar and a hydraulic header clip including the steps of: locating ends of a plurality of hollow strands and a plurality of solid strands within a cavity in an end fitting such that free ends of said hollow strands extend axially beyond free ends of said solid strands; and pre-placing an essentially phosphorous-free silver braze alloy around and between said ends of said hollow strands and said solid strands such that said braze alloy extends axially beyond the free ends of said solid strands.
41 Citations
19 Claims
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1. A method of forming a brazed joint between an end of an armature bar and a hydraulic header clip comprising:
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a) locating ends of a plurality of hollow strands and a plurality of solid strands of the armature bar within a cavity in an end fitting of the hydraulic header clip, such that free ends of said hollow strands extend axially beyond free ends of said solid strands; b) pre-placing an essentially phosphorous-free silver braze alloy around and between said ends of said hollow strands and said solid strands such that said braze alloy extends axially beyond the free ends of said solid strands; c) vertical orienting the plurality of hollow strands and the plurality of solid strands in the cavity of the end fitting, such that the free ends of the hollow strands are at a higher elevation than the free ends of said solid strands; d) positioning in a braze chamber the hydraulic header clip and the end of the armature bar, wherein the end of the armature bar and hydraulic header clip are adjacent an induction heating coil of the braze chamber; e) while the hollow strands and the vertical strands are vertically oriented, induction heating the phosphorous-free silver braze alloy to at least a liquidus temperature of the alloy and coating the free ends of said solid strands with the alloy, wherein the ends of said hollow strands remain free of the braze alloy during the induction heating step; f) the induction heating step is performed in a controlled gas atmosphere which is substantially free of oxygen in the braze chamber, and g) cooling the heated phosphorous-free silver braze alloy and forming a layer of the cooled braze alloy over the ends of said solid strands. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming a brazed joint between an armature bar and a hydraulic header clip comprising:
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locating free ends of hollow strands and free ends of solid strands of the armature bar within a cavity of an end fitting of the hydraulic header clip; extending a the free ends of the hollow strands beyond the free ends of the solid strands in the header clip; applying an essentially phosphorous-free silver braze alloy around and between said free ends of the hollow strands and said free ends of the solid strands such that said braze alloy extends axially beyond the free ends of the solid strands; vertically orienting the hollow strands and the solid strands in the cavity of the end fitting, such that the free ends of the hollow strands are at a higher elevation than the free ends of said solid strands; positioning in a braze chamber the hydraulic header clip and the end of the strands adjacent an induction heating coil of the braze chamber; while the strands are vertically oriented, induction heating the phosphorous-free silver braze alloy to at least a liquidus temperature of the alloy and coating the free ends of said solid strands with the alloy, wherein the ends of said hollow strands remain free of the braze alloy during the induction heating step; the induction heating step is performed in a controlled gas atmosphere which is substantially free of oxygen in the braze chamber, and cooling the heated phosphorous-free silver braze alloy and forming a layer of the cooled braze alloy over the ends of said solid strands. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of forming a brazed joint between an armature bar and a hydraulic header clip comprising:
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positioning free ends of hollow strands and free ends of solid strands of the armature bar within a cavity of an end fitting of the hydraulic header clip; arranging the free ends of the hollow strands beyond the free ends of the solid strands in the cavity; applying an essentially phosphorous-free silver braze alloy around the hollow strands and free ends of the solid strands, such that said braze alloy extends axially beyond the free the free ends of the solid strands and does not extend axially beyond the free ends of the hollow strands; vertically orienting the hollow strands and the solid strands in the cavity of the end fitting, such that the free ends of the hollow strands are at a higher elevation than the free ends of said solid strands; positioning in a braze chamber the hydraulic header clip and armature bar, wherein the ends of the strands and the hydraulic header clip are adjacent an induction heating coil of the braze chamber; while the strands are vertically oriented, induction heating the phosphorous-free silver braze alloy to at least a liquidus temperature of the alloy and coating the free ends of said solid strands with the alloy wherein the ends of said hollow strands remain free of the braze alloy during the induction heating step; the induction heating step is performed a controlled as gas atmosphere which is substantially free of oxygen in the braze chamber, and cooling the heated phosphorous-free silver braze alloy and forming a layer of the cooled braze alloy over the ends of said solid strands. - View Dependent Claims (19)
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Specification