MIL-DTL-24403/1F(SH)
4.6.1 Retests. When any original required conformance test (chemical, mechanical property, nondestructive
inspection, visual/dimensional, etc.) representing a lot of material fails to meet specification requirements, the lot
may be retested at the manufacturer's discretion. If the manufacturer chooses to retest the lot, the retests shall be as
follows:
a.
If the test failed due to one (or more) of the conditions listed in 4.6.1.1, then the lot shall be retested
according to the requirements in 4.6.1.2.
If the test failed due to conditions other than those listed in 4.6.1.1, then the lot shall be retested according
b.
to the requirements in 4.6.1.3.
Note that all the specimens in a single test, whether the test involves a single specimen (such as for radiographic
testing (RT)), or multiple specimens (such as for CVN impact tests), shall be considered a "set".
4.6.1.1 Testing/specimen preparation error retests. Retests to correct errors in testing and/or test specimen
preparation are permitted under the following conditions:
a.
Improperly fabricated test welds. This applies to test welds that have not been fabricated in accordance
with the applicable specification or the weld procedure for the product under test.
b.
Improperly prepared specimens. This applies to test specimens that are not in compliance with applicable
standards.
c.
Test equipment malfunction in the process of conducting a test.
d.
Flaws in test specimens that are not indicative of inferior or defective product. Flaws at weld starts and
stops at the ends of the test assembly, lack of fusion at the root and slag due to operator technique are
normal weld artifacts and do not count as flaws indicative of inferior or defective products. Cracks,
clustered porosity, flakes, and ruptures are flaws that may be indicative of inferior or defective products
and shall not qualify a lot for a testing/specimen preparation error retest.
4.6.1.2 Testing/specimen preparation error retest requirements. Retests for conditions listed in 4.6.1.1 shall be
as follows:
a.
For each original test that failed due to one (or more) of the conditions in 4.6.1.1, only one
testing/preparation error retest is permitted.
b.
A testing/preparation error retest shall consist of one replacement specimen for each specimen that failed
due to the conditions in 4.6.1.1. Note for RT, the specimen is the entire weld. If the testing error is due to
a malfunction of RT equipment or to a flaw not indicative of inferior or defective products (see 4.6.1.1.d)
that can be removed by grinding or other suitable methods within 1/16 inch of the surface, the original test
assembly may be retested.
c.
Results of all retests and reasons for all retests shall be reported on the certificate of conformance.
d.
Retests of weld metal (e.g., mechanical properties) shall be from the same weld used for the original test, if
feasible. If replacement test welds are needed, they shall be fabricated using consumables from the original
sampling, if feasible. If sufficient material is not available from the original sampling or storage of an
opened package is expected to influence results, another sample may be taken from the same lot and/or
production run.
e.
Retests of product (e.g., diffusible hydrogen, moisture, and chem. pads) shall be from the same sampling as
the original test, if feasible. If sufficient material is not available from the original sampling or storage of
an opened package is expected to influence results, another sample may be taken from the same lot and/or
production run.
f.
If the results of the testing/preparation error retest do not satisfy the applicable requirements, then a
conformance retest shall be performed per 4.6.1.3.
4.6.1.3 Conformance retest requirements. Retests for failure to meet test requirements shall be as follows:
a.
For each original test that failed due to conditions other than those listed in 4.6.1.1, only one conformance
retest is permitted.
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