MULTI-HOLE FLAT TUBE AND SINGLE HOLE TUBE MATERIAL FOR MULTI-HOLE FLAT TUBE

摘要

PROBLEM TO BE SOLVED: To provide a flat tube with favorable pressure resistance and easy thinning.;SOLUTION: The flat tube 1 of a multi-hole structure is formed by connecting the single hole tube materials 10, 10 by fitting together a recessed part 11 for connection formed by invaginating one part of a side face of the single hole tube material 10 throughout a whole tube material length, and a protruding part 12 for connection formed by protruding one part of a side face of the adjacent single hole tube material 10 throughout a whole tube material length. The single hole tube material is composed by bending one plate material so as to secure an internal space and carrying out mutual face-to-face contact of both tip sides. The flat tube with the multi-hole structure with high pressure resistance can be obtained by using a thin plate, and an internal volume with sufficient size appropriating a material amount can be obtained. Contact of a sacrificial material side and a flux can be avoided, and Mg can be contained in a sacrificial material to improve strength without causing a brazing defect.;COPYRIGHT: (C)2009,JPO&INPIT