MIL-STD-1894B
4. GENERAL REQUIREMENTS
4.1 Radiographic location. Weldments shall be 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. Establishment of radiographic frequency of spot checking
of weldments shall be accomplished in accordance with MIL-STD-1941. A Government
approved quality assurance plan has commonly been used.
4.1.2 Angle beam. Radiographic inspection of partial-penetration welds requires special
consideration of joint design when selecting the angle beam. 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 angle beam. 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).
Penetrameters/IQI's shall conform to the requirements of 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 steel weldments are shown in the reference standards forming
part of this document. These discontinuities are described below and in figures 2 through 6. All
cracks shall be rejected; any deviation from this procedure will require authorization from the
Government procuring activity.
a. Scattered porosity (fine and coarse). This discontinuity 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
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