Method for manufacturing a color cathode ray tube

摘要

Welding is conducted by rolling a roller electrode of a roller-type resistance welder while contacting an electrode surface of the roller electrode against an outer edge of the mask frame via the shadow mask. This method eliminates the need for complex control, and allows smooth and reliable welding at predetermined positions with a simple configuration. By forming the weld nugget on the side of the edge, a flat portion remains when the shadow mask is torn off the mask frame in case of a failure of the shadow mask. Thus, a second welding with a flat portion of the original height is possible, and the mask frame can be reused with the same precision for the welding position.