36 cross sectional area area to be considered after fracture or sectioning EN

36 cross sectional area area to be considered after

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3.6 cross-sectional area area to be considered after fracture or sectioning EN ISO 5817:2007 Licensed copy:PONTYPRIDD COLLEGE, 12/01/2008, Uncontrolled Copy, © BSI
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3 Key 1 X-ray detection 3 6-fold thickness 5 2-fold thickness 2 4 pores per volume unit 4 3-fold thickness 6 1-fold thickness Figure 1 — Radiographic films of specimens with identical occurrence of pores per volume unit 4 Symbols The following symbols are used in Table 1. a nominal throat thickness of the fillet weld (see also ISO 2553) A area surrounding the gas pores b width of weld reinforcement d diameter of gas pore d A diameter of area surrounding the gas pores h height or width of imperfection l length of imperfection in longitudinal direction of the weld l p length of projected or cross-sectional area s nominal butt weld thickness (see also ISO 2553) t wall or plate thickness (nominal size) w p width of the weld or width or height of the cross-sectional area z leg length of a fillet weld (see also ISO 2553) angle of weld toe angle of angular misalignment EN ISO 5817:2007 Licensed copy:PONTYPRIDD COLLEGE, 12/01/2008, Uncontrolled Copy, © BSI
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4 5 Assessment of imperfections Limits for imperfections are given in Table 1. If, for the detection of imperfections, micro-examination is used, only those imperfections shall be considered which can be detected with a maximum of tenfold magnification. Excluded from this are micro lack of fusion (see Table 1, 1.5) and microcracks (see Table 1, 2.2). Systematic imperfections are only permitted in quality level D, provided other requirements of Table 1 are fulfilled. A welded joint should usually be assessed separately for each individual type of imperfection (see Table 1, 1.1 to 3.2). Different types of imperfection occurring at any cross-section of the joint need special consideration (see multiple imperfections in Table 1, 4.1). The limits for multiple imperfections (see Table 1) are only applicable for cases where the requirements for a single imperfection are not exceeded. Any two adjacent imperfections separated by a distance smaller than the major dimension of the smaller imperfection shall be considered as a single imperfection. EN ISO 5817:2007 Licensed copy:PONTYPRIDD COLLEGE, 12/01/2008, Uncontrolled Copy, © BSI
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Table 1 — Limits for imperfections Limits for imperfections for quality levels No. Reference to ISO 6520-1:1998 Imperfection designation Remarks t mm D C B 1 Surface imperfections 1.1 100 Crack W 0,5 Not permitted Not permitted Not permitted 1.2 104 Crater crack W 0,5 Not permitted Not permitted Not permitted Maximum dimension of a single pore for — butt welds — fillet welds 0,5 to 3 d u 0,3 s d u 0,3 a Not permitted Not permitted 1.3 2017 Surface pore Maximum dimension of a single pore for — butt welds — fillet welds 3 d u 0,3 s , but max. 3 mm d u 0,3 a , but max. 3 mm d u 0,2 s , but max. 2 mm d u 0,2 a , but max. 2 mm Not permitted 0,5 to 3 h u 0,2 t Not permitted Not permitted 1.4 2025 End crater pipe 3 h u 0,2 t , but max. 2 mm h u 0,1 t , but max. 1 mm Not permitted Lack of fusion (incomplete fusion) Not permitted Not permitted Not permitted 1.5 401 Micro lack of fusion Only detectable by micro examination W 0,5 Permitted Permitted Not permitted 1.6 4021 Incomplete root penetration
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