MIL-W-8939A (MI)
4.4.4 Sampling size and testing frequency.
For production welds,
metallographic examination of one sectioned sample per machine for each weld
schedule per day is required.
Production welding shall be limited to the 24
For
hour period following welding of a satisfactory metallographic specimen.
production samples that fail weld strength tests during a 24 hour period,
testing of one newly welded metallographic section and three new strength test
samples shall be accomplished successfully prior to resumption of welding.
Each specimen shall conform to 3.7.1 and the control limits specified in
3.7.3.
4.4.5
Inspection of production parts .
4.4.5.1 External defects.
All external welds shall be inspected for
conformance with 3.7.1.
4.4.5.2 Functional testing.
All welded electronic assemblies shall be
functionally tested for conformance with applicable drawings or specifications
after welding.
PACKAGING
5.
This section is not applicable to this specification.
6.
NOTES
(This section contains information of a general or explanatory nature
that may be helpful, but is not mandatory.)
6.1
Intended use.
This specification is concerned primarily with the
However, it
processing of electronic modules used in missiles and aircraft.
may have application in the fabrication of electronic modules for general use.
6.2 Acquisition requirements.
Acquisition documents must specify the
following:
a.
Title, number, and date of the specification.
b.
Issue of DODISS to be cited in the solicitation, and if
required, the specific issue of individual documents
referenced (see 2.1.1).
When reports are required (see 4.3.7.2).
c.
6.3 Electrode maintenance.
6.3.1 Electrode cleaning. Electrodes should be cleaned whenever
splitting, metal sticking, deterioration, oxidation, or ether damage occurs.
6.3.2 Cleaning equ ipment.
Electrodes may be cleaned with No. 400 emery
paper or aluminum-oxide paper wrapped around the tip of a flat paddle. A
circular motion should be used with the paddle inserted between the electrodes
under slight electrode pressure.
6.3.3 Cleaning frequencies.
Cleaning of tapered electrodes should be
held to a minimum, since an increase in the surface area of the electrode tip
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