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ANP PROJECT PROGRESS REPORT
PUMP FABRICATION EXPERIMENTS
P. Patriarca G. M. Slaughter
Welding Studies
The dimensional changes associated with the
welding of lnconel pump volutes representative of
those designed for the main NaK pumps (PK-2)
of the ART were determined in a preliminary
investigation .’ These changes were considered
to be in excess of those allowable. Accordingly
the welding procedure was modified and the test
was repeated in the interest of improving the
ability to more nearly conform to acceptable
tolerances,
Two test pieces essentially similar to those
used previously were machined from 2-in. lnconel
plate. A shrinkage of 0.100 in. was provided for
in the fabrication of these pieces. Four spacers
were also machined from lnconel plate to act as
rigid supports during welding of the volutes after
’P, Patriorca, ANP Quar. Prog. Rep. March 10, 1956,
ORNL-2061, p 142.
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3.4. WELDING AND BRAZING INVESTIGATIONS
P. Patriarca
PK-2 WELD TEST
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the initial shrinkage occurred. These are shown
in Fig. 3.4.1, along with the component parts of
m
the test. The spacers were subjected to an
aluminizing treatment prior to assembly of the
components in order to prevent self-welding during
the subsequent operations. The two volutes were
welded in accordance with the welding procedure
described in Fig. 3.4.2.
Micrometer measurements were made at four
radial sections, as described in Fig. 3.4.3, prior
to and after each operation. The results of these
micrometer measurements are summarized in Table
*
3.4.1. It may be noted that the shrinkage decreased
with increased distance from the weld, *
an effect noted previously.’ It appears that an
improvement of the shrinkage prediction at position
3 by reducing the shrinkage allowance can be
accomplished only at a sacrifice in the absolute
shrinkage at positions 1 and 2, the over-all error
being of the order of 0.012 in.
A compromise would be to provide for a 0.090-in.
shrinkage allowance and thereby reduce the absolute
error to 0.006-in. The ability to reproduce
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Fig. 3.4.1. Component Parts for NaK (PK-2) Pump Volute Weld Shrinkage Test.
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