Heat-transfer tests of two steel cylinder barrels with aluminum fins manufactured by factory production method Page: 4 of 10
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S hyeical Testa
One barrel was out in half and one half wae out in quarters in
order to determine how good the bonds between the steel and the
almzinam base and between the fine and the aluminum basee were mechani-
cally. One edge of one of the qarters was polished and etched, and
the result shown in figure 4. The outline of the fine in the aluminum
base showed up about the same as for the barrel tested in reference 1.
The mechanical bond between the fine and the aluminum base was con-
eidered satisfactory in the case of the barrel of reference i, so that
I it can be concluded that such will be the case for the barrels re-
The steel was then pried loose from the aluminum of the quarter of
the barrel that was not etched. In the past, a half of a barrel has
been used for this particular teat. she quarter section wan used in
the present test beaoose the half section is to be used in tests to
develop an apparatue to determine quickly the thermal bond between the,
steel and aluminum of a large number of these barrels. The force re-
quired to remove the steel from the aluminum of the quarter section
was nmuch less than for the half sections previously used. reference
1), but it is thought that for a complete barrel with the strengthoning
provided by the fine no trouble shoul& be oxperioncod mechnnically.
1. noat-transfer tests indicate that the thermal bonds between
the aluminum fins end the aluminum baee and between the aluminum bsne
and the steel for the two barrels tested are very good.
2. Theo etching tests indicate that the mechanical bond between
the fine and the aluminum base for the two barrels is about the same
as for the barrel tested in reference 1, which was concidored enti-
3. The mechanical bond between the steel and aluminum base
should be satisfactory in a complete barrel.
4. The tests indicate that the method of maufPacture to be used
in large-volume production of theso barrels should be satisfactory.
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Ellerbrock, Herman H., Jr. Heat-transfer tests of two steel cylinder barrels with aluminum fins manufactured by factory production method, report, August 1, 1940; (digital.library.unt.edu/ark:/67531/metadc61923/m1/4/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.