Patent ID: 7895749

Claim:
A method for manufacturing a heat exchanger, said method comprising: forming heat exchange tubes of sheet material not having brazing material thereon, the heat exchange tubes having longitudinal bonding regions whereat edges of the sheet material overlap; assembling a heat exchanger by connecting a first tank having a first brazing layer disposed on a surface thereof with a second tank having a second brazing layer disposed on a surface thereof via a plurality of the heat exchange tubes such that the first tank communicates with the second tank via the heat exchange tubes, each of the plurality of heat exchange tubes having a first end portion fixed to the first tank on the surface having the first brazing layer and a second end portion fixed to the second tank on the surface having the second brazing layer; brazing the heat exchanger so as to cause capillary action to draw brazing material from the first brazing layer and the second brazing layer into the longitudinal bonding regions; disposing a plurality of outer fins in an alternating pattern with the plurality of heat exchange tubes so that no edges of the longitudinal bonding regions contact the plurality of outer fins.