| 摘要 |
<p>PURPOSE:To omit welding process on both a cathode sleeve and a cathode supporter while improving the quality together with saving labor, by assembling those components en bloc. CONSTITUTION:A cylindrical long tantalum tube is cut by laser light as shown in the cut parts 21 and 22. Thereby, a cathode sleeve 23 and a ribbon-shaped cathode supporter 24 are formed en bloc. And the cathode base 31 is put in a cup 32 made of tantalum or molybdenum while being fitted inside the top of the cathode sleeve 23 and fixed by laser light at plural welding points 41 on the circumference. Next, the ribbon-shaped cathode supporter 24 is turned up at the part 51 near the cathode sleeve 23 while being further bent near the other end part to form the welding margin 52 in order to be fixed by welding to the cathode supporting tube body.</p> |
