A heat exchanger, a tube for a heat exchanger, a method of making a tube for a heat exchanger and a method of making a heat exchanger

摘要

A tube 10 for a tube-and-fin brazed heat exchanger is made from a metal strip bent around to form the tube. The tube 10 includes at least one fold 40 or seam 26 which defines a longitudinal channel 24 in the surface of the tube 10, the or each channel 24 being welded so that it is filled at the end portions 30, 32 of the tube 10 by weld or brazing material 28 e.g. by laser metal deposition , the middle part 34 of the or each channel 24 being unfilled.