Patent ID: 6378203
Filing Date: 2002-04-30
Classification: B23K,B23P,F28D,F28F,Y10T

Abstract:
A method of constructing a fluid heat exchanger, said method comprising the steps of:constructing first and second, elongate, generally flat fluid heat exchanger tubes from an aluminum alloy, each said tube having an upper and a lower surface and having a fluid port inlet and a fluid port outlet, said first tube having a series of small protrusions formed at said lower surface and said second tube having a matching series of protrusions formed at said upper surface; applying a clad brazing alloy to each of said protrusions formed on the lower surface of the first tube and to each of said protrusions formed on the upper surface of the second tube; installing a thin sheet of a dissimilar metal on top of the protrusions formed at the upper surface of the second tube; stacking the first tube on top of said sheet of dissimilar metal with the protrusions at the lower surface of the first tube aligned with the protrusions at the upper surface of the second tube so as to form a stacked assembly; subjecting said stacked assembly to a temperature for a length of time sufficient to braze the first and second tubes to the sheet of dissimilar metal.