ORNL-1771 - Oak Ridge National Laboratory

U)JCLASSI F I tD
Y 12916
Fig. 7.1 1. Sodium-to-Air Radiator Showing Semi-
automatic He1 iarc Tube-to-Header Welds.
with a minimum of plugged interstices by furnace
brazing with a ductile oxidation-resistant high-
temperature brazing alloy such as 82% Au-18% Ni.
Experiments revealed that proper jigging was
extremely important in obtaining the completed air-
nozzle blank (Fig. 7.13). Each layer of rods was
tack-welded for rigidity, and the layers were then
tack-welded to form the assembly. Since the de-
termination of the exact amount of brozing alloy
required was difficult, if not impossible, sufficient
material was used to ensure good bonding at all
capillary joints. The excess material wa5 then
removed from the nozzle interstices by placing a
flat cross section against a metal sheet on which
PERIOD ENDING SEPTEMBER 70, 7954
Fig. 7.12. Completed Sodium-to-Air Radiator
Showing Tu be4c-F i n Mani fa1 d 'Construct E on.
many fine lines had been scribed. Upon rebrazing,
these fine scratches octed as capillaries and the
excess materia! was removed.
The design of the natural-gas nozzle specified
that a regular pattern of interstices should be
selectively closed, The closures were obtained by
inserting wires into the designated holes and brazing
them to the rods.
SPECIAL MATERIALS
FABRICATION RESEARCH
J. H. Gobs H. lnouye
Metallurgy Division
Stainless-Steel-Clad Molybdenum and Columbium
Two thermal-convection loops constructed of
stain 1 es s-s teel-cl ad mo I y bdenum were assem bled by
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