| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger manufacturing method in which a tube and an inner fin can be brazed with each other at a low cost. SOLUTION: In the heat exchanger manufacturing method, an inner fin 230 partially abutted on a tube inner wall 210b is disposed in a tube 210a in which a fluid flows, a brazing filler metal 240 is disposed between the tube inner wall 210b and the inner fin 230, and the tube 210a and the inner fin 230 are thermally joined with each other by the brazing filler metal 240. The brazing filler metal 240 is provided on at least one of the tube inner wall 210b or the inner fin 230 by the thermal spraying in advance. The brazing filler metal 240 is provided at an abutting part A where the tube inner wall 210b is abutted on the inner fin 230. The filler metal 240 is also provided on the inner fin 230 side. In addition, the area of the inner fin may be mad smaller and the thickness of the inner fin larger in the abutting part A. |
