Electric heating – Metal heating – For bonding with pressure
Patent
1985-04-04
1987-04-21
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219 85BA, 219 85D, 219 85M, B23K 100
Patent
active
046598960
ABSTRACT:
A method and apparatus for both implementing a braze melt and detecting the time, rate and direction of the braze melt along the longitudinal axis of the tube or sleeve being brazed. Generally, the invention comprises a radiant brazing heater having an electrical resistance coil assembly which serves the dual functions of providing a brazing heat onto a brazing material while simultaneously acting as an eddy current probe. In the preferred embodiment, the electrical resistance coil assembly consists of a pair of coils wound clockwise and counterclockwise, respectively, around the mandrel of the heater assembly. The invention further includes a control circuit having a mechanical relay for alternately switching the two coils of the coil assembly to a heater power source, and to an eddy current generator and detector circuit. The control circuit of the invention further includes a timing circuit for controlling the sequence of the switching operation of the mechanical relay, as well as a null command circuit for bringing the eddy current generator and detector to a null state every time the two coils are connected to the eddy current generator and detector circuit. The invention is particularly useful in brazing Inconel reinforcing sleeves within the heat exchange tubes of nuclear steam generators, where the utilization of the dual coils as a differential eddy current probe allows the operator to accurately determine when the brazing material which circumscribes the ends of the reinforcing sleeves melts, as well as the rate and direction of the braze melt.
REFERENCES:
patent: 3504149 (1920-03-01), Dixon et al.
patent: 4523177 (1985-06-01), Driggers
patent: 4559436 (1985-12-01), Roach et al.
patent: 4572938 (1986-02-01), Driggers et al.
patent: 4577083 (1986-03-01), Carreira
DePaul L. A.
Shaw Clifford C.
Westinghouse Electric Corp.
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