MIL-W-8939A (MI)
4.3.5
Test procedure.
4.3.5.1
All welds shall be examined for
conformance with 3.7.1,1.
4.3.5.2 Metallographic.
A minimum of two specimens from the set shall
be subjected to metallographic examination.
They shall be sectioned as nearly
as possible through the center of each weld as shown in figure 2. The
specimens shall then be polished and etched for metallographic examination and
shall conform to 3.7.2. The specimens shall be prepared for metallographic
inspection in accordance with ASTM E 3 and shall conform to 3.7.2.
4.3.5.3 Weld strength.
Forty-five specimens shall be tensile tested by
either method shown on figure 1.
However, the method selected shall be the
same for all subsequent testing.
Minimum parent metal breaking strength shall
be determined by pull testing 20 specimens and selecting the lowest value of
these.
The strength of each weld shall conform to the requirements of 3.7.3.
4.3.5.3.1
Rate of loading.
The specimen shall be loaded at a uniform
rate, to be established by the contactor and used for all testing
such rate
shall be not greater than 60 inches per minute.
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