| 摘要 |
PURPOSE:To permit an edge metal to be fixed firmly onto a base metal by forming the outer surface of the base metal and the inner surface of the edge metal into tapered surface and brazing said base metal and the edge metal, joining each tapered surface, thus permitting the difference of thermal expansion between the both metals to be absorbed. CONSTITUTION:A penetration hole 15 is formed at the center of a base metal 2, and a tapered surface 17 corresponding to a tapered surface 16 is formed on the inner surface of an edge metal 6. Said edge metal 6 is fitted onto the outer periphery of the base metal 2, joining the tapered surface 17 with the tapered surface 16, and the edge metal 6 and the base metal 2 are brazed on the tapered surfaces 16 and 17. Therefore, the difference of thermal expansion during brazing is absorbed through the relative transfer in the axial direction between the both, and the edge metal 6 can be brazed onto the base metal 2 with a broad adhesion area. |
