MIL-DTL-13080E
4.5.2 Visual and dimensional examination (except concentricity). Each of the sample electrodes
selected in accordance with 4.5.1 shall be examined to verify conformance with all requirements
which do not involve tests.
4.5.3 Concentricity. Each of the electrodes selected in accordance with 4.5.1 shall be tested as
specified in 4.6.2.
4.5.4 Sampling for other tests. Take one or more packages of electrodes at random from unit
packages selected for each lot in accordance with 4.5.1 or take random samples of electrodes from
the production line equivalent to the above so that all parts of the lot are represented. The sample of
electrodes shall be used for the tests specified in 4.6.3, 4.6.4, 4.6.5, 4.6.6, and 4.6.7 as applicable.
4.6 Test methods.
4.6.1 Dimensions and tolerances. Make determinations of the requirements for dimensions and
tolerances specified in 3.4.1, 3.4.8.1, 3.4.8.2, 3.6.1 and 3.6.2 in the course of making measurements
for concentricity in accordance with 4.6.2.
4.6.2 Concentricity. Make determinations of concentricity by either of the methods described in
4.6.2.1, 4.6.2.2, 4.6.2.3, or 4.6.2.4 on several electrodes of each size, selected from the samples
submitted.
4.6.2.1 Method I. At a point near one end of the covered length of the electrode, remove a portion
of the covering material completely to the bare core wire in the form of a band 1/2 in. (12.7 mm) wide
taking care to insure that no metal is removed from the core wire. Measure the diameter of the core
wire plus the thickness of the covering on one side of the electrode, using a micrometer and a
supplemental metal strip approximately 1 in. (25.4 mm) long by any convenient thickness, 0.125 or
0.250 in. (3.2 or 6.4 mm). Alternatively, a specially adapted micrometer having a T-shaped anvil may
be used. The metal strip shall bridge the gap left by the removal of the ring of covering material, and
the total measurement shall be noted. (It is immaterial whether or not the thickness of the metal strip
is included in the measurement.) Make several measurements on several different diameters around
the area from which the covering was removed, taking note of the minimum and maximum
measurements. Make a second and third series of similar measurements at approximately the mid-
length and the other end of the covered portion, respectively. Use the maximum and minimum
dimensions at any one section that show the greatest difference to determine the acceptability of the
electrodes in accordance with 3.4.1.
4.6.2.2 Method II (alternate method). Expose the core wire by removing a small amount of
covering from a spot on one side near one end of the covered length, taking care that no metal is
removed from the core wire. Measure the diameter of the core wire plus the thickness of the
covering on the side opposite the bared spot, with a micrometer. Then remove the covering from a
spot on the opposite side of the core wire at a point immediately adjacent to that where the first and
a second, similar, measurement were made. Make two additional pairs of similar measurements
approximately 60° and 120°, respectively, from the diameter on which the first pair of measurements
was made. Use the pair of measurements (two adjacent measurements) that show the greatest
variation to determine the acceptability of the electrodes in accordance with 3.4.1.
4.6.2.3 Method III (alternate method). At a point near the arc end of the covered length of the
electrode, a portion of the covering material in the form of two bands (each approximately 1/8 inch
wide and approximately 1 inch apart from each other), shall be completely removed to the bare core
wire, making sure that no metal is removed from the core wire. Using a V block support at each
band and an optical measuring scope with a measuring guide focused on the outer edge of the
covering, the electrode is rotated 360 degrees (1 turn). The minimum and maximum measurements
shall be recorded. The core wire diameter is measured using a micrometer. The above procedure
shall be repeated at the middle and grip ends of the electrode. The dimensions obtained shall be used
to determine compliance with 3.4.1.
8
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business