| 摘要 |
PROBLEM TO BE SOLVED: To permit correct brazing and prevent the occurrence of faulty jointing surely even when there is variation in a dimensional accuracy. SOLUTION: A tube for heat exchanger is constituted of a pair of tubular wall constituting bodies 10 and an inner fin 20. The pair of tubular wall constituting bodies 10 are provided with a U-shaped section respectively and a tubular configuration can be formed by coinciding the opposed tip ends of both side walls with each other. The internal area 21 of inner fin 20 is formed so as to have a section having a zigzag configuration and both side rim parts 22 are folded inward to provide folded parts 22a. The tubular wall constituting bodies 10 and the inner fin 20 are integrated through brazing to each other under a condition that the intermediate area 21 of the inner fin 20 are received in the U-shaped grooves of the pair of tubular wall constituting bodies 10 while the folded parts 22a of both sides of the same are pinched between the opposing tip ends of both side walls.
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