| 摘要 |
<p>A cathode filament formed from a thin metal wire wound into a helical spiral is welded at its two ends to connection braces by means of a high energy beam such as a laser beam. By increasing the pitch of at least one of the turns near each of the two ends, welding is confined to a predefined number of turns and uniformly welded cathodes are obtained having filament resistances which differ by less than 1%.</p> |
