Reference to ISO 6520 11998 Imperfection designation Remarks t mm D C 119 517

Reference to iso 6520 11998 imperfection designation

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Reference to ISO 6520-1:1998 Imperfection designation Remarks t mm D C 1.19 517 Poor restart W 0,5 Permitted. The limit depends on the type of imperfection occurred due to restart Not permitted Not permitted 0,5 to 3 Short imperfections: h u 0,2 mm + 0,1 a Short imperfections: h u 0,2 mm Not permitted 1.20 5213 Insufficient throat thickness Not applicable to processes with proof of greater depth of penetration 3 Short imperfections: h u 0,3 mm + 0,1 a , but max. 2 mm Short imperfections: h u 0,3 mm + 0,1 a , but max. 1 mm Not permitted 1.21 5214 Excessive throat thickness The actual throat thickness of the fillet weld is too large. W 0,5 Unlimited. h u 1 mm + 0,2 a , but max. 4 mm h u 1 mm + 0,15 a , but max. 3 mm 1.22 601 Stray arc W 0,5 Permitted, if the properties of the parent metal are not affected. Not permitted Not permitted 1.23 602 Spatter W 0,5 Acceptance depends on application, e.g. material, corrosion protection 10 B EN ISO 5817:2007 Licensed copy:PONTYPRIDD COLLEGE, 12/01/2008, Uncontrolled Copy, © BSI
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Table 1 ( continued ) Limits for imperfections for quality levels No. Reference to ISO 6520-1:1998 Imperfection designation Remarks t mm D C B 2 Internal imperfections 2.1 100 Cracks All types of crack except microcracks and crater cracks W 0,5 Not permitted Not permitted Not permitted 2.2 1001 Microcracks A crack usually only visible under the microscope (50 ) W 0,5 Permitted Acceptance depends on type of parent metal with particular reference to crack sensitivity The following conditions and limits for imperfections shall be fulfilled. See also Annex A for information. a1) Maximum dimension of the area of the imperfections (inclusive of systematic imperfection) related to the projected area NOTE The porosity in the project area depends on the numbers of layers (volume of the weld). W 0,5 for single layer: u 2,5 % for multi-layer: u 5 % for single layer: u 1,5 % for multi-layer: u 3 % for single layer: u 1 % for multi-layer: u 2 % a2) Maximum dimension of the cross- sectional area of the imperfections (inclusive of systematic imperfection) related to the fracture area (only applicable to production, welder or procedure tests) W 0,5 u 2,5 % u 1,5 % u 1 % 2.3 2011 2012 Gas pore Uniformly distributed porosity b) Maximum dimension for a single pore for — butt welds — fillet welds W 0,5 d u 0,4 s , but max. 5 mm d u 0,4 a , but max. 5 mm d u 0,3 s , but max. 4 mm d u 0,3 a , but max. 4 mm d u 0,2 s , but max. 3 mm d u 0,2 a , but max. 3 mm 11 EN ISO 5817:2007 Licensed copy:PONTYPRIDD COLLEGE, 12/01/2008, Uncontrolled Copy, © BSI
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Table 1 ( continued ) Limits for imperfections for quality levels No. Reference to ISO 6520-1:1998 Imperfection designation Remarks t mm D C 2.4 2013 Clustered (localized) porosity case 1 ( D d A2 ) case 2 ( D d A2 ) The sum of the different pore areas ( A 1 + A 2 + ...) related to the evaluation area l p w p (case 1). Reference length for l p is 100 mm. If D is less than d A1 or d A2 , whichever is smaller, an envelope surrounding the porosity areas A 1 + A 2 shall be considered as one area of imperfection (case 2).
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  • Spring '20
  • International Organization for Standardization

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