| 摘要 |
<p>In a manufacturing method of a heat exchanger including a core portion (11) having a plurality of tubes (13) and a plurality of radiation fins (14) connected to surfaces of the tubes, and a tank portion (12) communicating with the tubes, a preheating step, a brazing step, a gradual cooling step and a cooling step are performed in this order. In the preheating step, temperature of the tank portion having a large heat capacity is increased earlier than that of the core portion having a small heat capacity. Therefore, the temperature of the tank portion is rapidly increased, and the temperature of the core portion is obediently increased in accordance with the temperature increase of the tank portion. <IMAGE></p> |
