| 摘要 |
<p>PURPOSE:To enhance the quality and producibility by embedding the outer edges of high melting point metal thin wires, which are stretched radially from an impregnated cathode, in a cathode supporting table of metal having a lower melting point than the metal thin wires and in a welding nugget with a metal fitting having a lower melting point than the metal thin wires. CONSTITUTION:The outer edges of a plurality of high melting point metal thin wires 11 stretched radially from an impregnated cathode 5 are secured to the top of a cylindrical metal cathode supporting table 8 of a cathode holder 7, and these outer edges are embedded in a welding nugget 13, which is obtained by welding this supporting table 8 to a cylindrical metal fitting 12 installed on its outside circumference and is produced through this welding. The thin wires 11 intersect cruciform and, at this intersection, are welded previously between a metal cup 2 and a metal sleeve 3. In the process of fitting the metal fitting 12 on the outside circumference of the cathode supporting table 8, the outer edges of the thin wires 11 are fitted between these two members followed by laser welding in the direction of arrow, and now the metal fitting 12 and cathode supporting table 8 are partially melted to produce a welding nugget 13, in which the outer edges of the thin wires 112 are embedded.</p> |
