MIL-STD-1894B
3. DEFINITIONS
3.1 Metallographic cross sections. Cross sections through the welds as shown in
figures 1 through 8, which are cut perpendicular to the direction of welding, polished and etched
as specified in ASTM E340. These samples show internal discontinuity, depth of weld
penetration, weld size, and other characteristics of the weldment.
3.2 Partial-penetration joint design. The term "partial-penetration joint" as used in this
standard is defined as a weld joint containing an intentionally unfused area. Examples of typical
partial-penetration joint designs are shown in figure 9.
3.3 Penetrameter/Image Quality Indicator (IQI). A strip of metal the same composition
as that of the metal being tested, representing a percentage of object thickness and provided with
a combination of steps, holes, and/or slots. Its image on a radiograph is used to determine the
radiographic quality level. It is not intended for use in judging the size nor for establishing
acceptance limits of discontinuities. Examples of penetrameters/IQIs are shown in figures 2, 3, 4,
5 and 6.
3.4 Nondestructive testing terms and definitions. Nondestructive testing terms and
definitions are as specified in ASTM E1316.
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