Method for controlling brazing

Details Method for controlling brazing Method for controlling brazing

2006-08-01

2006-08-01

Tran, Len (Department: 1725)

Electric heating

Metal heating

For deposition welding

C228S208000, C228S175000

Reexamination Certificate

active

07084366

ABSTRACT:
A method for making a braze joint across a discontinuity in a work piece using alternating current. A filler metal is pre-placed at a location sufficiently close to the discontinuity such that, when an alternating current is applied across a work piece to heat the work piece and melt the filler metal, the filler metal is drawn into the discontinuity. The alternating current is maintained for a set residence time, generally less than 10 seconds and more particularly less than 3 seconds. The alternating current is then altered, generally by reducing the current and/or voltage such that the filler metal can solidify to form a braze joint of desired quality and thickness.

REFERENCES:
patent: 4609566 (1986-09-01), Hongo et al.
patent: 5102031 (1992-04-01), Heitman et al.
patent: 5686206 (1997-11-01), Baum et al.
patent: 5880425 (1999-03-01), Carnes, Jr. et al.
patent: 5898994 (1999-05-01), Miller et al.
Petzold, J. Vac. Sci. Technol. B, vol. 9 (5), Sep./Oct. 1991, p. 2664-2670.

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