| 摘要 |
PROBLEM TO BE SOLVED: To surely perform brazing between the apex of a partition and a tube inner surface, and reduce a coating amount or application amount of a brazing material as much as possible, in a flat tube having a partition part on a width directional intermediate part.SOLUTION: A groove-like recess part 5 for brazing material holding is formed over the whole length of an apex 4 of a partition part 3, and plural slits 6 penetrates through the bottom part of the groove-like recess part 5 so as to separate from each other with constant intervals. Then, a brazing material coated or applied to the outer surface side of a flat tube is flowed into the groove-like recess part 5 through the slits 6, and the partition part 3 and a flat tube inner surface are fixed over the whole length with the brazing material. |
