| 摘要 |
667,319. Electron discharge apparatus. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Feb. 16, 1950 [Feb. 25, 1949], No. 4038/50. Class 39 (i). [Also in Group XXII] In order to join parts of tungsten or molybdenum they are first superficially carburized at the places where they are to be joined, then they are heated while in contact to melt the carbide, but not the metal and finally the carburized portions are reduced to metal at a temperature below the melting point of the metal. The invention may be applied to the joining of a spiral winding of wire 1 to its core 2 to form a thermionic filament F, Fig. 4. |
