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|  MIL-W-47091A (MI)
3.5.1 Welds in steel. Completed welds in mild steel, high strength mild steel,
low alloy steel, or corrosion resistant steel shall be thoroughly cleaned by chipping and
wire brushing to remove scale and flux prior to subsequent operations.
3.5.2 Gas welded aluminum parts. Gas welded aluminum alloy parts shall be
defluxed by a suitable method immediately after welding. This may be accomplished
by submerging the parts in 10% sulfuric acid solution for 20 to 30 minutes followed by
a thorough rinse in clean running water.
3.6 Penetration. Penetration of fillet welds when cross sectioned and examined
as specified herein shall equal 15 to 25% of the base metal thickness in material of not
less than 0.25 inch thick. In material greater than 0.25 inch thick, penetration shall be
not less than 0.0625 inch. Butt welded joints shall have 100% penetration unless
partial penetration is permitted by symbol call out.
3.7 Workmanship. Workmanship shall be in accordance with high grade
commercial practice covering this class of work. Weld beads shall be reasonably
smooth and uniform. Evidence of excessive undercutting cold laps, porosity blow
holes, cracks or slag inclusion shall be cause for rejection.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. 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 requirements of
sections 3 and 5. The inspection set forth in this specification shall become a part of
the contractor's overall inspection system or quality program. The absence of any
inspection requirements in the specification shall not relieve the contractor of the
responsibility of ensuring that all products or supplies submitted to the Government for
acceptance comply with all requirements of the contract. Sampling inspection, as part
of manufacturing operations, is an acceptable practice to ascertain conformance to
requirements, however, this does not authorize submission of known defective
material, either indicated or actual, nor does it commit the Government to accept
defective material.
4.2 Lot. For purposes of acceptance, a lot of metallic parts welded under this
specification shall consist of all the units of a single production order submitted for
inspection at one time.
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