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发表于 2016-8-26 16:46
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来自： 中国山东青岛
.12.6. The acceptance criteria for radiographic testing are given in Table 13.2.5, and those for ultrasonic testing in Table 13.2.6.
Table 13.2.5 Acceptance criteria for radiographic testing
Discontinuity Classification according to ISO 6520-1 Acceptance criteria for radiographic testing, see Note 1
Crack 100 Not accepted
Lack of fusion 401 Continuous maximum length t/2 or 25 mm, whichever is the less, see Note 2
Intermittent cumulative length maximum t or 50 mm, whichever is less, see Note 3
Lack of root fusion 4013 Not accepted in butt joints welded from one side
Incomplete root penetration 4021 Not accepted in butt joint welded from one side
Continuous maximum length t/2 or 25 mm, whichever is lesser, see Note 2
Intermittent cumulative maximum length t or 50 mm, whichever is less, see Note 3
Slag inclusion 301 Continuous maximum length t or 50 mm, whichever is less, see Note 2
Intermittent cumulative length maximum 2t or 100 mm, whichever is less, see Notes 3 and 4
Gas pore 2011 maximum dimension for a single pore:
d ≤ 0,2t, max. 4,0 mm
see Note 5
Uniformly distributed porosity 2012 Maximum dimension of the area of imperfections:
For single run welds: ≤ 1,5%
For multi-run welds: ≤ 3%
see Notes 6 and 7
Clustered (localised) porosity 2013 Maximum dimension of the summation of the projected area of the imperfection: ≤ 8%
see Notes 6 and 7
Elongated cavity 2015 h ≤ 0,3t, max. 3,0 mm
l ≤ t, max. 50 mm
see Notes 8 and 9
Wormholes 2016 h ≤ 0,3t, max. 3,0 mm
l ≤ t, max. 50 mm
see Notes 8 and 9
Metallic inclusions other than copper 304 h ≤ 0,3t, max. 3,0 mm
see Note 8
Copper inclusions 3042 Not permitted
NOTES
1. t is the thickness of the thinnest plate.
2. Two adjacent individual discontinuities of length ld1 and ld2 situated on a line and where the distance ld between them is shorter than the shortest discontinuity are to be regarded as a continuous discontinuity of length ld1+ld+ld2
3. Sum of the length of individual continuous discontinuities.
4. Parallel inclusions not separated by more than 3 times the width of the largest inclusion are to be regarded as one continuous discontinuity.
5. d is the diameter of the gas pore.
6. The limits for the maximum single gas pore within this group still apply.
7. Further reference to porosity limits may be obtained in ISO 5817:2007.
8. h is the width of the imperfection.
9. l is the length of the imperfection.
Table 13.2.6 Acceptance criteria for ultrasonic testing
Echo height Acceptance criteria for ultrasonic testing, see Note
Greater than 100% of DAC curve Maximum length t/2 or 25 mm, whichever is less
Greater than 50% of DAC curve, but less than 100% of DAC curve Maximum length t or 50 mm, whichever is less
Indications evaluated to be cracks are unacceptable regardless of echo height;
Indications evaluated to be lack of penetration or lack of root fusion in joints welded from one side are unacceptable regardless of echo height.
NOTE
Two adjacent individual discontinuities of length L1 and L2 situated on a line and where the distance L between them is shorter than the shortest discontinuity are to be regarded as a continuous discontinuity of length L1 + L + L2.
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