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

TABLE V. Discontinuity limits.

IMPERFECTION	CLASS OF WELDS
IMPERFECTION	A	B	C
SURFACE POROSITY:
Individual size maximum	0.25 T or 0.030 inch whichever is less	0.33 T or 0.060 inch whichever is less	0.50 T or 0.090 inch whichever is less
Spacing - minimum	8 times the size of the larger adjacent imperfection	4 times the size of the larger adjacent imperfection	2 times the size of the larger adjacent imperfection
Accumulated length in any 3 inches of weld - maximum	1 T or 0.12 inch whichever is less	1.33 T or 0.24 inch whichever is less	2 T or 0.36 inch whichever is less
UNDERCUT:
For full length of weld - maximum depth	0.002 inch	0.015 T or 0.002 inch whichever is greater	0.025 T or 0.002 inch whichever is greater
Individual defect maximum depth	0.07 T or 0.030 inch whichever is less	0.10 T or 0.050 inch whichever is less	0.20 T 04 0.070 inch whichever is less
Accumulated length in any 3 inches of weld - maximum	0.20 inch	0.60 inch	1.00 inch
UNDERFILL AND/OR CONCAVITY:
For full length of weld - maximum depth	0.005 inch	0.015 T or 0.005 inch whichever is greater	0.025 T or 0.005 inch whichever is greater
Individual defect maximum depth	0.07 T or 0.030 inch whichever is less	0.10 T or 0.050 inch whichever is less	0.20 T or 0.070 inch whichever is less
Accumulated length in any 3 inches of weld - maximum	0.20 inch	0.60 inch	1.00 inch
SUBSURFACE POROSITY AND INCLUSIONS:
Individual size maximum	0.33 T or 0.060 inch whichever is less	0.50 T or 0.090 inch whichever is less	Not applicable
Spacing - minimum	4 times the size of the larger adjacent imperfection	2 times the size of the larger adjacent imperfection	Not applicable
Accumulated length in any 3 inches of weld - maximum	1.33 T or 0.24 inch whichever is less	2 T or 0.36 inch whichever is less	Not applicable
INCOMPLETE PENETRATION:
Maximum depth	none	0.20 T or 0.05 inch whichever is less	0.20 T or 0.05 inch whichever is less
CRATERS:
Maximum depth	0.20 T or 0.03 inch whichever is less	0.20 T or 0.05 inch whichever is less	0.20 T or 0.05 inch whichever is less
Maximum length	1 T	1 T	2 T
CRACKS:	None	None	None
COLD SHUT: 1/	1 T or 0.1 inch 2/ whichever is lesser	1 T maximum length	2 T maximum length