MIL-W-8939A (MI)
When examined at a minimum magnification of 50
3.7.2 Metallographic.
diameters, welds shall be free from cracks. No weld shall contain voids
which, considered together, exceed in total length 10 percent of the interface
length.
No void shall be closer than 10 percent of the interface length to
the end of the interface. Electrode indentation, embedment, and set-down
shall not exceed that allowed by 3.7.1.1.
3.7.3 Machine qualification test specimen.
3.7.3.1 Weld strength.
The strength of each weld shall be equal to or
greater than 80 percent of the minimum parent metal breaking strength.
3.7.3.2 Coefficient. The coefficient of variation of weld strengths
shall be equal to or less than 0.20.
Highest weld strength - lowest weld strength
Coefficient of variation =
Average weld strength
3.7.4 Weld strength test specimens.
Weld strength.
3.7.4.1
Specimens tested shall exhibit strength equal
to not less than 50 percent of the minimum parent metal strength.
Weld strength values shall have a coefficient of
3.7.4.1.1 Values.
variation not greater than the following:
Group A:
0.20
0.25 in 90 percent of the specimens tested; 0.35 in the
Group B:
remainder
Group C:
0.35 in 90 percent of the specimens tested; 0.45 in the
remainder
When combinations of different groups are welded,
the less stringent values
shall apply.
The contractor shall establish suitable welding
3.8 Welding schedule.
schedules for each material or combination of different materials and each
thickness combination to be welded in production by an approved machine.
QUALITY ASSURANCE PROVISIONS
4.
4.1
Responsibility for inspe ction. Unless otherwise specified in the
contract or purchase order, the contractor is responsible for the performance
of all inspection requirements (examinations and tests) as specified herein.
Except as otherwise specified in the contract or purchase order, the
contractor may use his own or any other facilities suitable for the
performance of the inspection requirements specified herein, unless
disapproved by the Government.
The Government reserves the right to perform
any of the inspections set forth in this specification where such inspections
are deemed necessary to ensure supplies and services conform to prescribed
requirements.
4.1.1
Responsibility for compliance. All items shall meet all
requirement:
of sections 3 and 5. The inspection set forth in this
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