| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of corrosion due to external factors such as cleaning liquids and solvents at the time of cleaning by a hollow button and brazing an upper cover material to a lower cover material at the time of brazing the lower cover material. SOLUTION: By providing an air vent hole at the back leg brazed adhesion location 1a of a lower cover material 2 to release expanded air completely at the time of brazing the lower cover material 2 to an upper cover material 1, at the time of making the back leg of the lower cover material 2 adhere by brazing, an air passage hole i.e., a pinhole is prevented from occurring at a braze part. In this way, the upper cover material 1 is brazed to the lower cover material 2 through the use of low-temperature fusing braze. By this constitution, it is possible to prevent the occurrence of corrosion during use due to the action of external factors such as oxidizing gases in environment, cleaning liquids and solvents at the time of washing and leaning.
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