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

a.        The qualified settings reproducibility sample is not able to meet the requirements of this document.

b.   The qualified weld settings will not provide acceptable product weld quality.

5.3.5 Welding procedures

5.3.5.1 Filler metal

The filler metal alloy shall be specified on the drawing or in the weld procedure.

5.3.5.2 Preheating, interpass temperature control and postheating

Preheating, interpass temperature control and postheating when used in conjunction with a qualified setting shall become a part of the qualified weld setting procedure. Preheating, interpass temperature control and postheating is required for in-process correction, when it is required for, the original weld.  Torch heating with a gentle, soot- free, neutral flame is allowed.  Oxy-acetylene torch heating is not allowed for titanium or magnesium.  Localized heating is allowed.  Temperature gradients shall be wide

spread.  The preheat, interpass and postheat temperatures specified herein apply to the weld joint area.  Maximum temperatures apply to the entire part.  The use of furnaces, heat lamps, resistance elements, induction heating and other devices with pyrometric controls is preferred over torch heating.

5.3.5.2.1 Magnesium castings

Preheating and interpass temperature control is recommended as follows:

a.   F condition - 450° to 500°F

b.   T condition - 250° to 300°F

Recommended for sections greater than 0.125 inch thick.

5.3.5.2.2 Steels

Preheating and interpass temperature control should be exercised with steels that are susceptable to cracking.  Some examples of steels which are susceptable to cracking are:

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