Fixture and ray tube cathode welding process

The invention discloses a fixture, comprising a base and a bracket; an annular plate is arranged on the upper end of the base, the bracket is arranged on the upper end of the base, a positioning rod is arranged on the base, and the bracket comprises a supporting rod connected to the base and a claw or a collar connected to the supporting rod; the bracket is detachably connected to the base; a positioning recess is arranged on the base; and the fixture further comprises a pressing sheet for clamping, and the pressing sheet is connected to the base by screws. The whole fixture is simple in structure, convenient to operate and simple in assembly process, the positioning surface follows an irregular shape, and the advantage of fool-proofing positioning function and good positioning accuracy can be achieved; in the whole process, all components are clamped at one time, welded in segments and positioned accurately, and rapid and reliable welding is realized; and when the fixture is placed onan automatic rotary weld