MIL-STD-2219 Fusion Welding for Aerospace Applications S/S by AWS-D17.1The scope of this document is to provide minimum requirements for weld filler materials, workmanship, inspection and record requirements for fusion welding of alloys applicable to aircraft, missiles, other aerospace equipment, their parts and accessories.

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MIL-STD-2219A

w/CHANGE 1

5.2.2 Preweld joint preparation

5.2.2.1 Surface finish of fusion faces

Surface finish of fusion faces for Class A welds shall be defined in the welding procedure or on the drawing.  Fusion faces shall be free of cracks, laminations and burrs.

5.2.2.2 Joint and filler metal cleanliness

All faying surfaces shall be free from slag, visible surface oxides, scale, protective finishes, oils, grease, dirt, and other foreign materials.  Solvent cleaning is allowed for degreasing base metal and bare filler metal.  Caution: Chlorinated hydrocarbon solvents shall not be used in pre-weld cleaning of titanium parts.  Wire brushing, chemical cleaning, filing or scraping may be used as required to remove oxide or other contaminants from the fusion faces and faying surfaces.  The cleaned area shall not be contaminated.  Only clean lint-free gloves shall be used when handling cleaned titanium filler metal and joint surfaces.

5.2.3 Pre-weld joint fit-up

If not stated on the engineering drawing or in the weld procedure, joint fit-up for all classes of welds shall conform to TABLE II and FIGURE 1, FIGURE 2 and FIGURE 3, as applicable.  Where a specified fit-up gap is given as part of a weld procedure and no tolerances are given, the allowances of TABLE II may be added.  Magnesium butt joints welded from one side only may be back beveled, as shown in FIGURE 4.

TABLE II.  Maximum root opening.

Where "T" is thickness of the thinner member.

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