Brazed joint

Claim 1

IN A HEAT EXCHANGER HAVING WELDED HEADERS FOR PASSING FLUIDS IN HEAT EXCHANGE RELATIONSHIP WITH EACH OTHER, A HEAT EXCHANGER CORE COMPRISING A PLURALITY OF THIN SEPARATOR PLATES DEFINING FLUID PASSAGEWAYS IN COMMUNICATION WITH RESPECTIVE HEADERS, A PLURALITY OF CORRUGATED FIN MEMBERS DISPOSED BETWEEN ADJACENT PLATES TO DEFINE A PLURALITY OF FLUID PASSAGES IN EACH OF SAID FLUID PASSAGEWAYS, A PLURALITY OF BAR MEMBERS OF CONSIDERABLY THICKER SECTION THAN SAID PLATES DISPOSED BETWEEN ADJACENT PLATES, EACH OF SAID BAR MEMBERS HAVING OPPOSED SURFACES, A PLURALITY OF ELONGATED SPACED APART DISCONTINUITIES IN SAID SURFACES EXTENDING BETWEEN OPPOSITE EDGES OF SAID SURFACES WITH EACH DISCONTINUITY BEING SUBSTANTIALLY SMALLER IN CROSS SECTION THAN THE SPACING CHANNELS THEREBETWEEN, EACH DISCONTINUITY INCLUDING AT LEAST ONE RIDGE EXTENDING ABOVE THE NORMAL BAR MEMBER SURFACE, BRAZING ALLOY SURFACE CLADDING ON THE OPPOSITE FACES OF SAID SEPARATOR PLATES, SAID RIDGES ENGAGING THE RESPECTIVE CLADDING AND BEING IN JUXTAPOSITION TO SAID PLATES WHEREBY THE BRAZING ALLOY CLADDING IS DISPOSED IN SAID CHANNELS AND BETWEEN SAID RIDGES AND SAID PLATES SO AS TO PROVIDE BRAZED JOINTS OF SOLID CROSS SECTION THROUGHOUT THE ENTIRE EXTENT OF THE INTERFACES BETWEEN SAID SEPARATOR PLATES AND SAID BAR MEMBERS, SAID BAR MEMBERS BEING OF SUFFICIENT SIZE AND SAID SOLID CROSS SECTION BEING OF SUFFICIENT WIDTH WHEREBY TO DISSIPATE HEAT INCIDENT TO WELDING OF SAID HEADERS TO SAID BAR MEMBERS WITHOUT MATERIAL DAMAGE TO SAID BRAZED JOINTS.