| 摘要 |
An assembly (oil cooler unit), under the state where first and second plates (130, 140) prevent a heat exchange core (110) from falling from a casing (120), is provisionally assembled, and this oil cooler unit is dipped in a flux to apply the flux. A seal surface plate (150) is then assembled to the second plate (140) and is brazed by heat-brazing in an inert gas atmosphere. Since a flux residue on the seal surface plate (150) can be drastically reduced in this manner after brazing is complete, the seal surface plate (150) can secure predetermined surface texture even after brazing is complete while the number of process steps necessary for applying the flux is reduced.
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