MIL-STD-1895B(AT)
4. GENERAL REQUIREMENTS
4.1 Radiographic location. Weldments are radiographically inspected in the location
specified on the applicable radiographic position chart drawing, component drawing,
specification, or contract requirement. Radiographic inspection shall meet the requirements of
MIL-STD-410 and ASTM E1742.
4.1.1 Radiographic frequency. Establishing radiographic frequency of spot checking of
weldments shall be accomplished in accordance with a Government approved quality assurance
plan. The frequency of spot-checking and selection of the applicable standard has historically
been based on the importance of the particular joint.
4.1.2 Angle beam. Radiographic inspection of partial-penetration welds requires special
consideration of joint design when selecting the radiation angle. The angle employed shall insure
adequate coverage of the weld with minimal interference from the normally unfused area.
Generally this can be achieved by directing the X-ray beam such that any possible incomplete
penetration at both roots would be separated on the film by at least 0.125 in. (3.18 mm). Figure 1
illustrates the radiographic results of a correct and incorrect radiation angle. If a radiographic
position chart is not available, the recommended procedures shown on figure 9 shall be used as a
guide.
4.1.3 Penetrameter/IQI requirements. Each penetrameter/IQI shall be produced with
three holes, one of which shall be a diameter equal to twice the penetrameter/IQI thickness (2T).
Penetrameter/IQI requirements are given in ASTM E142 and ASTM E1742.
4.2 Acceptance standards. Designation of acceptance standards for each type of
discontinuity illustrated in the reference standards shall be made by the design activity and
approved by the Government procurement agency. The specific level of acceptance shall be
designated by the "Standard Level" which is the minimum acceptance level for that discontinuity.
The standard level shall be documented on the applicable radiographic position chart, drawing or
contract requirement.
4.3 Discontinuity types. With the exception of cracks, the common discontinuities
experienced in partial-penetration aluminum weldments made are shown in the reference
standards forming part of this document. These discontinuities are described below and in
figures 2 through 6. All cracks have historically been rejected and any deviation from this
procedure will require authorization from the Government procuring activity.
a. Scattered porosity (fine and coarse). This flaw consists of scattered voids formed
by gasses failing to escape during weld metal solidification. On the radiograph
these discontinuities are dark round or elongated spots of varying size and density.
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