An aluminum heat exchanger is provided. In one embodiment, the aluminum heat
exchanger
comprises a fin having a first aperture therethrough with a flange formed around
the first aperture. The fin is made from a first alloy having a first melting point.
The heat exchanger includes a refrigerant tube made from a second alloy having
a second melting point. The refrigerant tube extends through the first aperture.
The heat exchanger also has a tubular coupling made from a third alloy having a
third melting point and that is coupled to an end of the refrigerant tube. A fourth
alloy having a fourth melting point less than the first, second, and third melting
points is interposed the refrigerant tube and the flange, and further interposed
the refrigerant tube and the tubular coupling. A method of manufacturing and a
refrigeration unit are also provided.
