System for forming brazed joint between tie wire and workpiece, and methods therefor
First Claim
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1. A system for forming a brazed joint between a tie wire and a bucket of a steam turbine, the system comprising:
- a braze chamber including an induction heating coil, the induction heating coil having magnetic flux concentrators thereon; and
a controller receiving a temperature feedback signal from a temperature sensor on the tie wire and controlling a temperature of a section of the tie wire to be brazed by controlling an electrical current applied to the induction heating coil,wherein the induction heating coil is positioned at a section of the tie wire distinct from the section of the tie wire to be brazed, and the controller regulates a temperature of a location of the brazed joint by controlling the electrical current applied to the induction heating coil.
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Abstract
A system for forming a brazed joint between a tie wire and a workpiece, and methods therefor are presented. The system includes: a braze chamber including an induction heating coil, the induction heating coil having magnetic flux concentrators thereon; and a controller receiving a temperature feedback signal from a temperature sensor on a tie wire and controlling a temperature of a section of the tie wire to be brazed by controlling an electrical current applied to the induction heating coil.
13 Citations
20 Claims
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1. A system for forming a brazed joint between a tie wire and a bucket of a steam turbine, the system comprising:
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a braze chamber including an induction heating coil, the induction heating coil having magnetic flux concentrators thereon; and a controller receiving a temperature feedback signal from a temperature sensor on the tie wire and controlling a temperature of a section of the tie wire to be brazed by controlling an electrical current applied to the induction heating coil, wherein the induction heating coil is positioned at a section of the tie wire distinct from the section of the tie wire to be brazed, and the controller regulates a temperature of a location of the brazed joint by controlling the electrical current applied to the induction heating coil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming a brazed joint, the method comprising:
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placing a tie wire within a section of an induction heating coil of a braze chamber, the induction heating coil having magnetic flux concentrators thereon; aligning a section of a steam turbine bucket for brazing with a section of the tie wire for brazing, wherein the section of the tie wire for brazing is distinct from the section of the induction heating coil within the induction heating coil; applying a braze alloy in contact with the section of the steam turbine bucket and the section of the tie wire to be brazed; applying an electrical current to the induction heating coil to heat the section of the tie wire for brazing to form the brazed joint; receiving a temperature feedback signal from a temperature sensor on the tie wire; and regulating a temperature of the tie wire and the steam turbine bucket by controlling the electrical current applied to the induction heating coil. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of forming a brazed joint, the method comprising:
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placing a tie wire within an induction heating coil of a braze chamber, the induction heating coil having magnetic flux concentrators thereon; applying an electrical current to the induction heating coil to heat a section of the tie wire therebetween to a temperature range of approximately 705°
C. to approximately 810°
C. for approximately 30 sec to approximately 10 min,wherein the section of the tie wire is aligned with a section of a workpiece for brazing, and the section of the tie wire and the section of the workpiece are in contact with a braze alloy; receiving a temperature feedback signal from a temperature sensor on the tie wire; and regulating the temperature range of the tie wire and the workpiece by controlling the electrical current applied to the induction heating coil. - View Dependent Claims (17, 18, 19, 20)
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Specification