| 摘要 |
PROBLEM TO BE SOLVED: To improve the performance of a completely welded plate-type heat exchanger formed integrally by laminating and welding a plurality of heat transfer plates, and to lower the production cost. SOLUTION: In the heat exchanger, a plurality of heat transfer plates 5, each having an edge rise part 5b on an outer periphery, are laminated to form a plate lamination body 7. While the upper and lower heat transfer plats 5 are positioned to each other by superposing the edge rise parts 5b, the peripheral parts of passage ports are laser-welded together, to form inner seal welding lines Li. The outer surfaces of the edge rise parts 5b to be superposed ends are superposed on and welded to the ends of the mutually superposed edge rise parts 5b of the respective heat transfer plates 5 exposed to the side surface of the plate laminate 7, in which the prescribed number of heat transfer plates 5 are laminated by fillet welding method, to form outer sealing lines Lj and complete the plate laminate 7.
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