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

5.3.5.2.3 Other base metals

Preheat and interpass temperature control is optional for all other base metals not identified in 5.3.5.2.1 and 5.3.5.2.2. If preheat and interpass temperature control are required, they shall be authorized by the cognizant engineering organization and detailed on the drawing.

5.3.5.3 Tackwelds

If filler metal is used for tacking, use the same filler metal alloy as specified for the weld. The length and size of tack welds shall be limited to a size that will be melted by the subsequent weld pass.

5.3.5.4 Fixtures

Fixtures, backing materials and hold-down bars shall be kept clean and free of contaminants during use.

5.3.5.5 Weld start and run-off tabs

Weld start and run-off tabs when used shall be composed of the same alloy as the detail parts, and shall be welded with the same filler metal as required by the part.

5.3.5.6 Weld shielding for GTAW, GMAW, and PAW

The weld shall be protected from oxidation during welding. Completed weldments including heat affected surfaces shall comply with the requirements of 5.3.5.8 and

5.4.3.5. Shielding gas and material combinations shall be as noted in TABLE III unless otherwise specified in the contract or on the drawing.

5.3.5.7 Cleaning between welds

Prior to depositing each pass of a noncontinuous multipass weld or deposition of a root pass on the side opposite the original weld, the welder or welding operator shall visually examine for contamination and defects. Contamination and defects, other than discoloration for titanium alloys, shall be removed by wire brushing, machining, rotary filing, drilling, grinding, sanding or scouring. Removal of unacceptable discoloration for titanium alloys, as specified in 5.4.4.3, shall be accomplished by any of the following methods: scraping, scouring, machining, rotary filing, wire brushing or by cleaning in accordance with ASTM-8600. Cleaning titanium with chlorinated solvents or methyl alcohol is prohibited.