Method of tipping refractory metal tubulation

Details Method of tipping refractory metal tubulation Method of tipping refractory metal tubulation

1977-02-17

1978-09-26

Goldberg, E. A.

Electric heating

Metal heating

For bonding with pressure

219 9123, 219149, 228 60, 228173F, B23K 1100

Patent

active

041172990

ABSTRACT:
An improved method for sealing off the refractory metal exhaust tubulation of the ceramic arc tube employed in the high pressure sodium discharge lamp. The method involves a single four-directional crimp of the tubulation to form an X-shaped cross-section and the subsequent electrical resistance tip-off of the tubulation while it is disposed in an inert gas atmosphere at a pressure which is higher than the pressure of the rare gas atmosphere within the arc tube and tubulation and is also above atmospheric to insure all oxygen is flushed from the area of the melting.

REFERENCES:
patent: 3415977 (1968-12-01), Bush
patent: 3444348 (1969-05-01), Goodman
patent: 3566067 (1971-02-01), Larson

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