Tungsten lamp filament welded joint to lead

Details Tungsten lamp filament welded joint to lead Tungsten lamp filament welded joint to lead

H - Electricity

01

K

313/182, 316/29

H01K 1/16 (2006.01) H01J 5/00 (2006.01) H01K 3/00 (2006.01)

Patent

CA 1181471

TUNGSTEN LAMP FILAMENT WELDED JOINT TO LEAD ABSTRACT OF THE DISCLOSURE In a joint between a coiled tungsten filament of an electric lamp and molybdenum lead, the lead connects integrally into a weld section which extends longitudinally within the coiled filament. The weld section may be formed by suddenly melting that portion of the lead involved in the joint, by pulse discharge, within an inert or reducing gas. The melted molybdenum wets the tungsten coil and is drawn by capillarity into the turns of the coil where it is rapidly chilled, and solidifies in a time interval too short for appreciable crystal growth and embrittlement to occur in the tungsten, the time interval being two seconds or less.

390548

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