LAMINATION TYPE HEAT EXCHANGER

PROBLEM TO BE SOLVED: To provide a laminated heat exchanger of which internal leakage caused by the joining failure of partitioning parts can be checked easily. SOLUTION: In a laminated heat exchanger partitioned into two parts by a partitioning part, a pair of thin metal plates 4 being matched are placed on the female die 201 of a shearing machine. Then, by driving a male die 202 from upward to downward, the joining part 49a of a pair of center ribs are cut at the central part by mating between a chevron metal blade 202a arranged to the male die 202 and a chevron metal blade 201 a arranged to the female die 201, a pair of cutting surfaces 49c are formed by cutting the joining parts by a shearing work and the pair of cutting surfaces 49c arc exposed to the outside of the thin metal plates 4. Therefore, if the joining failure is occurred at the joining parts 49c, the nitrogen gas leaks from the cutting surface 49c being exposed to the outside from the thin metal plates 4 by filling and pressurizing the nitrogen gas inside an evaporator immersing it in the liquid after blazing the whole parts of the evaporator.