Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1991-10-30
1993-02-16
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
138 90, 219 60R, B23K 916
Patent
active
051873435
ABSTRACT:
A purge block with non-inflatable, disc-like seals removably mounted on either end of an elongate tube. In one embodiment, the tube is rigid and hollow and forms part of a conduit for argon or other inert gas through one of said seals to a set of discharge ports adjacent the near end of the other seal. A vent tube extends separately through the first seal. In a second embodiment, the elongate tube is semi-rigid, and a passageway is provided through each seal to discharge ports located adjacent the inner end of each seal to permit gas to flow outside the tube from the inlet end seal of the purge block to and through the outlet end seal.
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