1、 Reference numberISO 11666:2010(E) ISO 2010 INTERNATIONAL STANDARD ISO11666First edition2010-12-15Non-destructive testing of welds Ultrasonic testing Acceptance levels Contrle non destructif des assemblages souds Contrle par ultrasons Niveaux dacceptation ISO 11666:2010(E) PDF disclaimer This PDF fi
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6、country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reserved ISO 11666:2010(E) ISO 2010 All rights reserved iii Contents Page Foreword .iv
7、 1 Scope.1 2 Normative references.1 3 Measurement of indication length.1 4 Sensitivity setting and levels .2 5 Acceptance levels .2 5.1 General .2 5.2 Longitudinal indications.3 5.3 Transverse indications .3 5.4 Grouping of indications.3 5.5 Cumulative length of acceptable indications.4 Annex A (nor
8、mative) Levels.5 Annex B (normative) Fixed amplitude level technique.17 ISO 11666:2010(E) iv ISO 2010 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
9、Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, al
10、so take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committ
11、ees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the poss
12、ibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 11666 was prepared by the European Committee for Standardization (CEN) Technical Committee TC 121, Welding, Subcommittee SC 5,
13、Testing of welds, in collaboration with ISO Technical Committee TC 44, Welding and allied processes, Subcommittee SC 5, Testing and inspection of welds, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). Requests for official interpretations of any aspe
14、ct of this International Standard should be directed to the Secretariat of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be found at www.iso.org. INTERNATIONAL STANDARD ISO 11666:2010(E) ISO 2010 All rights reserved 1 Non-destructive testing of welds Ultraso
15、nic testing Acceptance levels 1 Scope This International Standard specifies ultrasonic acceptance levels 2 and 3 for full penetration welded joints in ferritic steels, which correspond to ISO 5817 quality levels B and C. An acceptance level corresponding to ISO 5817 quality level D is not included i
16、n this International Standard as ultrasonic testing is generally not requested for this weld quality. These acceptance levels are applicable to testing carried out in accordance with ISO 17640. This International Standard applies to the examination of full penetration ferritic steel welds, with thic
17、knesses from 8 mm to 100 mm. It can also be used for other types of welds, materials and thicknesses above 100 mm, provided the examinations have been performed with necessary consideration of the geometry and acoustic properties of the component, and an adequate sensitivity can be employed to enabl
18、e the acceptance levels of this International Standard to be applied. The nominal frequency of probes used in this International Standard is between 2 MHz and 5 MHz unless attenuation or requirements for higher resolution call for other frequencies. The use of these acceptance levels in conjunction
19、with frequencies outside this range needs to be considered carefully. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced d
20、ocument (including any amendments) applies. ISO 5817, Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections ISO 17635, Non-destructive testing of welds General rules for metallic materials ISO 17640, Non-destructive testing
21、of welds Ultrasonic testing Techniques, testing levels, and assessment ISO 23279, Non-destructive testing of welds Ultrasonic testing Characterization of indications in welds 3 Measurement of indication length The length of an indication shall be determined by measuring the distance along the length
22、 over which the echo amplitude is above the evaluation level, using the fixed amplitude level technique specified in Annex B. Alternative techniques for measuring indication length may be used when specified. ISO 11666:2010(E) 2 ISO 2010 All rights reserved 4 Sensitivity setting and levels The sensi
23、tivity setting may be performed by one of the following techniques. For sensitivity setting and the subsequent examinations, the same technique shall be used: a) technique 1: based on 3 mm diameter side-drilled holes; b) technique 2: based on distance gain size (DGS) curves for flat-bottom holes (di
24、sk-shaped reflectors); c) technique 3: using a distance-amplitude-corrected (DAC) curve of a rectangular notch of 1 mm depth and 1 mm width; d) technique 4: using the tandem technique with reference to a 6 mm diameter flat-bottom hole (disk-shaped reflector). Four levels as defined in ISO 17640 are
25、used in this International Standard: 1) reference level; 2) evaluation level; 3) recording levels (for two acceptance levels, reference levels are derived from the relevant acceptance level minus 4 dB); 4) acceptance levels (for two quality levels). All levels are linked to the reference reflectors
26、specified in Table A.1. Annex A specifies levels. 5 Acceptance levels 5.1 General The relationship between acceptance levels, testing levels and quality levels is given in ISO 17635. See also Table 1. Table 1 Ultrasonic pulse echo technique (UT) Quality level in accordance with ISO 5817 Testing tech
27、nique and level in accordance with ISO 17640a Acceptance level in accordance with this International Standard B at least B 2 C at least A 3 D at least A 3b a When characterization of indications is required, ISO 23279 shall be applied. b UT is not recommended but can be defined in a specification (w
28、ith the same requirements as quality level C). The acceptance levels in this International Standard are valid for all testing levels and for all techniques as defined in ISO 17640, including tests with straight beam probes. If characterization has been specified in accordance with ISO 23279, planar
29、indications are not acceptable and for non-planar indications, the acceptance levels in this International Standard apply. If characterization has not been specified, the acceptance levels in this International Standard apply to all indications. ISO 11666:2010(E) ISO 2010 All rights reserved 3 5.2 L
30、ongitudinal indications Table A.1 gives information on the techniques used for evaluation of indications according to ISO 17640 and the related evaluation and acceptance levels. Table A.2 specifies the acceptance levels for technique 2 using transverse waves. Table A.3 specifies the acceptance level
31、s for technique 2 using longitudinal waves. For techniques 1 (side-drilled holes) and 3 (rectangular notch), see Figures A.1 to A.4. For techniques 2 flat-bottom holes (disk-shaped reflectors) and 4 (tandem technique), see Figures A.5 to A.8. Any indication with an amplitude below the acceptance lev
32、el but with a length (above evaluation level) exceeding t, for the thickness range of 8 mm u t 15 mm, or t/2 or 20 mm, whichever is the larger, for all other thickness ranges, shall be subject to further testing. This requires the use of additional probe angle(s), and, if specified, the tandem techn
33、ique. The final evaluation shall be based on the maximum echo amplitude and length measured. 5.3 Transverse indications When detection of transverse indications is specified, the acceptance levels stated in 5.2 apply. 5.4 Grouping of indications Grouping is based on the length and the separation of
34、two individually acceptable indications having amplitudes above the recording level. The length of a group shall not be used for further grouping. For evaluation, a group of indications shall be considered as a single one if: a) the distance, dx, is less than twice the length of the longer indicatio
35、n (see Figure 1); b) the distance, dy, is less than half of the thickness but not more than 10 mm; c) the distance, dz, is less than half of the thickness but not more than 10 mm. The combined length is: l12 = l1 + l2 + dx (see Figure 2). The combined length, l12, and the larger maximum amplitude of
36、 the two indications shall then be assessed against the applicable acceptance levels given in Table A.1. Key dx, dy, dz distances in the x-, y-, and z-directions, respectively ln where n = 1 3, individual indications Figure 1 Geometric configuration for grouped indications ISO 11666:2010(E) 4 ISO 20
37、10 All rights reserved Key dx distance in the x-direction l1, l2 individual indications l12 combined length Figure 2 Length of a group of indications 5.5 Cumulative length of acceptable indications The cumulative length of all individually acceptable indications above recording level is given as the
38、 sum of lengths of both single indications and linearly aligned indications of combined length within a given section of weld length. Key lc cumulative length lc = l2 + l3 + l45 + l6 lw weld length ln where n = 1 7, individual indications Figure 3 Cumulative length of indications For any section of
39、weld length, lw, the maximum cumulative length of all individually acceptable indications above the recording level shall not exceed 20 % of this length for acceptance level 2, or 30 % of this length for acceptance level 3, where lw = 6 t for t 15 mm and lw = 100 mm for t W 15 mm. ISO 11666:2010(E)
40、ISO 2010 All rights reserved 5 Annex A (normative) Levels Key 1 reference level 2 acceptance level 2 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.1 Levels for techniques 1 and 3 for thicknesses 8 mm to 15 mm Acceptance level 2 ISO 11666:
41、2010(E) 6 ISO 2010 All rights reserved Key 1 reference level 2 acceptance level 3 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.2 Levels for techniques 1 and 3 for thicknesses 8 mm to 15 mm Acceptance level 3 ISO 11666:2010(E) ISO 2010 Al
42、l rights reserved 7 Key 1 reference level 2 acceptance level 2 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.3 Levels for technique 1 for thicknesses 15 mm to 100 mm Acceptance level 2 ISO 11666:2010(E) 8 ISO 2010 All rights reserved Key
43、1 reference level 2 acceptance level 3 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.4 Levels for technique 1 for thicknesses 15 mm to 100 mm Acceptance level 3 ISO 11666:2010(E) ISO 2010 All rights reserved 9 Key 1 reference level 2 acce
44、ptance level 2 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.5 Levels for technique 2 for thicknesses 8 mm to 15 mm Acceptance level 2 ISO 11666:2010(E) 10 ISO 2010 All rights reserved Key 1 reference level 2 acceptance level 3 3 recordin
45、g level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figure A.6 Levels for technique 2 for thicknesses 8 mm to 15 mm Acceptance level 3 ISO 11666:2010(E) ISO 2010 All rights reserved 11 Key 1 reference level 2 acceptance level 2 3 recording level 4 evaluation leve
46、l H amplitude l indication length n multiplier of t t thickness Figure A.7 Levels for technique 2 for thicknesses 15 mm to 100 mm Acceptance level 2 ISO 11666:2010(E) 12 ISO 2010 All rights reserved Key 1 reference level 2 acceptance level 2 3 recording level 4 evaluation level H amplitude l indicat
47、ion length n multiplier of t t thickness Figure A.8 Levels for technique 4 for thicknesses 15 mm to 100 mm Acceptance level 2 ISO 11666:2010(E) ISO 2010 All rights reserved 13 Key 1 reference level 2 acceptance level 3 3 recording level 4 evaluation level H amplitude l indication length n multiplier
48、 of t t thickness Figure A.9 Levels for technique 2 for thicknesses 15 mm to 100 mm Acceptance level 3 ISO 11666:2010(E) 14 ISO 2010 All rights reserved Key 1 reference level 2 acceptance level 3 3 recording level 4 evaluation level H amplitude l indication length n multiplier of t t thickness Figur
49、e A.10 Levels for technique 4 for thicknesses 15 mm to 100 mm Acceptance level 3 ISO 11666:2010(E) Table A.1 Acceptance levels 2 and 3 for techniques 1, 2, 3, and 4 Evaluation level Acceptance level 2 (AL 2) Acceptance level 3 (AL 3) Technique (according to ISO 17640) for AL 2 for AL 3 8 mm u t 15 m
50、m 15 mm u t 100 mm 8 mm u t 15 mm 15 mm u t t: H0 10 dB For l u 0,5 t: H0 For 0,5 t t: H0 10 dB For l u t: H0 For l t: H0 6 dB For l u 0,5 t: H0 + 4 dB For 0,5 t t: H0 6 dB 2 flat-bottom holes (disk-shaped reflectors) H0 8 dB in accordance with Table A.2 or A.3 H0 4 dB in accordance with Table A.2 o
