MIL-HDBK-1890(AT)
TABLE III. Radiographic and ultrasonic inspection acceptance limits for arc or oxyfuel gas welded joints (iron, nickel and cobalt base alloys)
Type of defect |
Class 1 |
Class 2 |
Class 3 |
Cracks (weld and base material), including cavities or inclusions with a tail |
u |
u |
u |
Incomplete penetration & fusion |
u |
Butt and corner welds: u. Fillet welds: max length - 4T in any 10T length of weld, or 40% of joint length, whichever is less. Plug: 20% along crcmf. |
Butt and corner welds: u. Fillet welds: max length - 10T in any 20T length of weld, or 50% of joint length, whichever is less. Plug: 50% along crcmf. |
Porosity & voids Max. size "D" Max total length per linear inch Min. distance between indications |
T/3 up to 0.060 max. 2 of max. size or equivalent length 5D |
T/2 up to 0.080 max. 3 of max. size or equivalent length 4D |
T/2 up to 0.100 max. 6 of max. size or equivalent length 3D |
Metallic and non- metallic inclusions Max. size "D" Max. total length Min. distance between indications |
T/3 up to 0.060 max. 2 of max. size or equivalent length 5D |
T/2 up to 0.080 max. 3 of max. size or equivalent length 4D |
T/2 up to 0.100 max. 4 of max. size or equivalent length 3D |
u - unacceptable.
T - Thickness of thinnest base material.
D - Diameter of largest dimension of defect(s).
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