Multichannel flat tube for brazed heat exchanger i.e. radiator, of motor vehicle, has metal sheet folded to form end portions of tube along semi-circle, where portions has thickness different from thickness of lower and upper parts of tube

摘要

The tube has a single metal sheet folded for forming end portions (7, 8) of the tube along a semi-circle having a diameter equal to a height of the tube, where the end portions present a thickness different from a thickness of flat lower and upper parts (11, 14) of the tube. End parts (15, 16) include a thickness (E3) different from the thicknesses of the end portion and the lower and upper parts and variable on a length of the end portions. The thickness of the lower and upper parts is lesser than the thickness of the end portions or the thickness of the end parts.