Welded tungsten filament to lead joint

Details Welded tungsten filament to lead joint Welded tungsten filament to lead joint

1983-03-14

1987-04-28

Dixon, Harold A.

Electric lamp and discharge devices

Electrode and shield structures

With lead wire or connector

313341, 445 48, H01J 550

Patent

active

046617396

ABSTRACT:
In a brazed joint between a coiled tungsten filament and a molybdenum lead, the lead continues integrally into a braze section which extends longitudinally within the coiled filament. The braze section may be formed by suddenly melting the portion of the lead used in the joint by a pulse discharge in an inert or reducing gas. The liquid molybdenum wets the tungsten and is drawn by capillarity into the turns of the coiling where it is rapidly chilled and solidifies in a time interval too short for appreciable crystal growth and embrittlement to occur in the tungsten.

REFERENCES:
patent: 1022553 (1912-04-01), Howell
patent: 2359302 (1944-10-01), Curtis
patent: 2403070 (1946-07-01), Fulton

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