Materials and Methods of Construction in Light Structures Page: 27 of 38
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J.A.C.A. Technical Meomorandumu Ilo, 515
al and steel, the light .etal is never attacked. These
experimental results are confirmed by experience.
Although I naturally agree with Dr. Rohrbach that en-
tirely closed profiles do not wear as well in use as open
ones, a good protectiveo coat inside a closed profile lasts
better than a like coat on exposed surfaces. Experience
has shown that structural parts suffer most where, through
lack of proper care, the protective coat is removed by
mechanical injuries and fails to be renewed. It seems to
bo established that light-metal parts require the greatest
attention, even in use.
Dr. Rohrbach's arguments wore especially interesting
as regards the possibility of reducing the production
costs by suitable equipment. In ener al, the equipment
increases the so-called unproductive capital. I would be
gr-ateful to the lecturer if he could tell us in what ratio
the sum of the uni-roductive and productive capital is re-
duced by suitable equipment. It might be still more dif-
ficult to answer the second question, as to whether the
cost reduction of a piece is due simply to the familiar-
ization of the worker with the production method, or in
what proportion it is ascribable to the equipment. I
would rppreciato having Dr. Rohrbach give us further infor-
msaton on this point.
rEnineer Schrek,.- Thus far nothing hos been said to-
day concerning an important method of joining steel parts,
Lamely, by welding.
I have just come from the welding session of the
7.,I.. (Verein Loutscher Ins enieure) in Hamburg, where I
learned how the process of welding is continually making
progress in all fields of mechanical construction. It is
by no means new in airplane construction. (See V.A.C,A.
Technical eoranduml Ko. 453, "Welding in Airplane Con-
struction," by A. Rechtlich and !. Schrenk.)
The advantages of welding rre obvious, namely, the
possibility of making the most difficult junctions with a
minium increase in weigt, especially of joining tubes
in te si~mplest way imaginable without increase in weight,
and the economy of this method.
iany r persons, however, entertain serious doubts as to
the - visability of welding in airplane construction. They
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Rohrbach, Adolf. Materials and Methods of Construction in Light Structures, report, May 1929; (https://digital.library.unt.edu/ark:/67531/metadc65364/m1/27/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.