manufacturing method for condenser tube increased tensile strength

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The present invention relates to a manufacturing method of a heat exchanger with improved tensile strength of a condenser tube. An aluminum alloy rod is manufactured by using a continuous casting device, wherein a material including 0.05-0.2 wt% of Fe, 0.1-0.5 wt% of Zr, 0.01-0.2 wt% of MM (Misch metal), 0.01-0.2 wt% of Sc, and 0.001-0.01 wt% of Y is alloyed with molten aluminum. And a condenser tube is formed by conform-extruding the alloyed material. A heat exchanger is formed by assembling the condenser tube with a pin member and a head pipe and brazing the assembled condenser tube. The heat exchanger is thermally treated at a temperature of 200-500°C so that the tensile strength of the condenser tube is improved. Therefore, the tensile strength of the condenser tube is increased by forming an aluminum alloy, forming the condenser tube by utilizing the aluminum alloy, and thermally treating the heat exchanger.