| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiator with high pressure-tight strength. SOLUTION: An internal wall surface 33a of a cap part 33 of a header tank 3 is formed in a spheric shape, and the connecting part A between the internal wall surface 33a of the cap part 33 and the internal wall surface 32a of the tank part 32 is separated from the connecting part B between the external wall surface of a tube 21 and the internal wall surface 32a of the tank part 32 by having a predetermined size L. Thereby, the brazing filler material coating between the connecting parts A and B of the internal surface 32a is drawn into the joint gap between the tube 21 and the tank part 32, so that the tube 21 and the tank part 32 can be firmly bonded through brazing. |
