| 摘要 |
<p>A vacuum-tight hard solder joint is made between two metal parts where at least the two joint surfaces are made of copper. The hard solder is a gold foil. This is placed between the two joint surfaces, and then the two parts are pressed together and soldered at 935-985 degrees C, esp. 940-980 degrees C. When multiple stepped soldering is employed, a gold foil is pref. used for at least the first two joints, the first joint being made at 975-985 degrees C, esp. 980 degrees C and the second joint being made at 955-965 degrees C, esp. 960 degrees C. The metal parts and the Au foil are pref. placed in a solder mould before heating. The Au foil is pref. 5-20 mu m thick, esp. 10 mu m thick. This soldering process is pref. applied to delay lines for travelling wave tubes, or to wave guides, esp. hollow parts. The joints are always vacuum-tight.</p> |
