| 摘要 |
<p>A flat-shaped tube (2), a structural member of a radiator (1), can be manufactured easily without welding a connection portion for connecting edge portions of a plate member together. A connecting portion (11c) of the tube (2) is formed in a double layer structure such that both opposing edge portions of the tube are bent toward each other in a curved shape, the inner face of one of the curved portions (11i) and the outer face of the other curved portion (11g) overlap with each other in a surface contact state in the width direction of the tube, and the surface contact portion is fixed through a brazing material (13).</p> |
