HEAT-EXCHANGER

PROBLEM TO BE SOLVED: To improve fluid erosion resistance by a method wherein the throttle surface of the groove part of a molding plate in the vicinity of the U-turn part of a tube element through which a heat-exchange refrigerant passes is formed at a gentle angle with a brazing margin. SOLUTION: A heat-exchange medium flows through an inflow port 8 of a tube element 2, and a pipe part 11 the direction of which is changed at a U-turn part 18 of a tip 9 and is returned to an outflow port 10 again is provided. The tube element 2 is formed in such a manner that two molding plated 12 and 12 are arranged face to face. The molding plate 12 is provided at a periphery with brazing margins 13 at which the molding plates are joined together when joining face to face is effected. A groove part 14 is provided at an inner side with a pipe part 11 through which a heat-exchange medium flows, and a partition wall 15 by which the medium is caused to flow in an U-shape is arranged in a longitudinal direction with a part of a tip left non-joined. This constitution forms a fillet in a large size, keeps a thickness at a desired value, and improves fluid erosion resistance.