Method and apparatus for electrically brazing cellular structures

Claim 1

APPARATUS USABLE FOR INTERNALLY BRAZING SPACED METALLIC EXTENDED SURFACE SHEETS OF A WORK PIECE TO ITS HONEYCOMB METALLIC CORE, COMPRISING THERMAL INSULATING MEANS FOR RECEIVING AND ENVELOPING THE WORK PIECE TO MINIMIZE HEAT LOSSES THEREFROM, A FLEXIBLE HEATING PAD CONTAINED WITHIN SAID INSULATING MEANS IN CLOSE RELATION TO THE WORK AREA TO BE BRAZED, SAID PAD COMPRISING A UNITIZED LAMINAR ASSEMBLY INCLUDING ELECTRICALLY INSULATIVE AND HEAT CONDUCTIVE LAYERS AND HEATING MEANS SANDWICHED THEREBETWEEN FOR GENERATING HEAT ELECTRICALLY THEREIN AT TEMPERATURES IN EXCESS OF 1000* F., AND UNIFORMLY OVER AN EXTENDED HEATING AREA TO CORRESPOND TO THE WORK AREA TO BE BRAZED, AND HEAT CONDUCTIVE ELECTRICAL INSULATION MEANS FOR TRANSFERRING HEAT FROM SAID HEATING MEANS TO THE WORK PIECE UNIFORMLY THROUGHOUT THE BRAZE AREA.