1、December 2013 Translation by DIN-Sprachendienst.English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).I
2、CS 25.160.40!%*q*“2077807www.din.deDDIN EN ISO 15626Non-destructive testing of welds Time-of-flight diffraction technique (TOFD) Acceptance levels (ISO 15626:2011);English version EN ISO 15626:2013,English translation of DIN EN ISO 15626:2013-12Zerstrungsfreie Prfung von Schweiverbindungen Beugungsl
3、aufzeittechnik (TOFD) Zulssigkeitsgrenzen (ISO 15626:2011);Englische Fassung EN ISO 15626:2013,Englische bersetzung von DIN EN ISO 15626:2013-12Contrle non destructif des assemblages souds Technique de diffraction des temps de vol (TOFD) Niveaux dacceptation (ISO 15626:2011);Version anglaise EN ISO
4、15626:2013,Traduction anglaise de DIN EN ISO 15626:2013-12SupersedesDIN EN 15617:2009-07www.beuth.deDocument comprises 16 pagesIn case of doubt, the German-language original shall be considered authoritative.11.13 DIN EN ISO 15626:2013-12 2 A comma is used as the decimal marker. National foreword Th
5、e text of ISO 15626:2011 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” and has been taken over as EN ISO 15626:2013 by Technical Committee CEN/TC 121 “Welding and allied processes” (Secretariat: DIN, Germany). The responsible German body involved in its preparatio
6、n was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-08-23 AA Ultraschallprfung. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 5817 DIN EN ISO 5817 ISO 10863 DIN EN ISO 10863 ISO 1
7、7635 DIN EN ISO 17635 Amendments This standard differs from DIN EN 15617:2009-07 as follows: a) the content of ISO 15626:2011 has been adopted in its entirety. Previous editions DIN EN 15617: 2009-07 National Annex NA (informative) Bibliography DIN EN ISO 5817, Welding Fusion-welded joints in steel,
8、 nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections DIN EN ISO 10863, Non-destructive testing of welds Ultrasonic testing Use of time-of-flight diffraction technique (TOFD) DIN EN ISO 17635, Non-destructive testing of welds General rules for metallic materials
9、 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15626 August 2013 ICS 25.160.40 Supersedes EN 15617:2009English Version Non-destructive testing of welds - Time-of-flight diffraction technique (TOFD) - Acceptance levels (ISO 15626:2011) Contrle non destructif des assemblages souds - Techniq
10、ue de diffraction des temps de vol (TOFD) - Niveaux dacceptation (ISO 15626:2011) Zerstrungsfreie Prfung von Schweiverbindungen - Beugungslaufzeittechnik (TOFD) - Zulssigkeitsgrenzen (ISO 15626:2011) This European Standard was approved by CEN on 8 August 2013. CEN members are bound to comply with th
11、e CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Managemen
12、t Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status
13、as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, N
14、etherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of e
15、xploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 15626:2013: EContents Page Foreword 31 Scope . 42 Normative references .43 Symbols, terms and definitions .44 Relation between quality levels and acceptance levels .55 Definition and determination o
16、f length and height .56 Acceptance levels 8Bibliography 14DIN EN ISO 15626:2013-12 EN ISO 15626:2013 (E) 2 Foreword The text of ISO 15626:2011 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) and has been ta
17、ken over as EN ISO 15626:2013 by Technical Committee CEN/TC 121 “Welding” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2014, and conflicting na
18、tional standards shall be withdrawn at the latest by February 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supe
19、rsedes EN 15617:2009. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of
20、Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 15626:2011 has been approved b
21、y CEN as EN ISO 15626:2013 without any modification. DIN EN ISO 15626:2013-12EN ISO 15626:2013 (E) 3 1 Scope This International Standard specifies acceptance levels for the time-of-flight diffraction technique (TOFD) of These acceptance levels are applicable to indications classified in accordance w
22、ith ISO 10863. 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 document (including any amendments) applies. ISO 5817, W
23、elding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006) 3 Symbols, terms and definitions 3.1 Symbols h height of an indication (see Figures 1, 2 an
24、d 3) l length of an indication (see Figures 1, 2 and 3) t nominal wall thickness in accordance with construction drawing or dimension table (see Figures 1, 2 and 3) 3.2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.2.1 embedded discontinuity di
25、scontinuity within the volume of the material, separated from the surfaces 3.2.2 surface-breaking discontinuity discontinuity connected to the near (contact) surface or far (reflecting) surface of ISO 5817. full penetration welds in ferritic steels from 6 mm up to 300 mm thickness which correspond t
26、o the quality levels ISO 10863, Non-destructive testing of welds Ultrasonic testing Use of time-of-flight diffraction technique (TOFD)1)1) To be published. DIN EN ISO 15626:2013-12 EN ISO 15626:2013 (E) 4 4 Relation between quality levels and acceptance levels Three different acceptance levels are d
27、efined. The relation between these acceptance levels and the quality levels as mentioned in ISO 5817 are given in Table 1. Table 1 Acceptance levels Quality level according to ISO 5817 Examination level in accordance with Acceptance level B (Stringent) C 1 C (Intermediate) at least B 2 D (Moderate)
28、at least A 3 5 Definition and determination of length and height 5.1 General The size of a discontinuity is described by the length and height of its indication. Length is defined by the difference of the x-coordinates of the indication. The height is defined as the maximum difference of the z-coord
29、inates at any given x-position. 5.2 Determination of length 5.2.1 General Dependent upon the type of indication, one of the techniques for length sizing according to 5.2.2 or 5.2.3 shall be applied: 5.2.2 Length sizing of elongated straight indications This type of indication does not change signifi
30、cantly in the through-wall direction. A hyperbolic cursor is fitted to the indication. Assuming the discontinuity is elongated and has a finite length, this will only be possible at each end. The distance moved between acceptable fits at each end of the indication is taken to represent the length of
31、 the discontinuity (see Figure 1). Key 1 Length of indication Figure 1 Length sizing by fitting arc-shaped cursors ISO 10863DIN EN ISO 15626:2013-12EN ISO 15626:2013 (E) 5 5.2.3 Length sizing of elongated curved indications This type of indication does change significantly in the through-wall direct
32、ion. A hyperbolic cursor is positioned at either end of the indication at a time delay of one third of the indication penetration. The distance moved between the cursor positions at each end of the indication is taken to represent the length of the discontinuity (see Figure 2). Key 1 Length of indic
33、ation Figure 2 Length sizing of elongated curved indication 5.3 Determination of height 5.3.1 General The height measurement shall be done from the A-scan and by choosing a consistent position on the signals, considering phase reversals. It is recommended to use one of the following methods: Method
34、1: by measuring the transit time between the leading edges of the signals; Method 2: by measuring the transit time between the first peaks; Method 3: by measuring the transit time between the maximum amplitudes. DIN EN ISO 15626:2013-12 EN ISO 15626:2013 (E) 6 Key 1 Method 1 2 Method 2 3 Method 3 4
35、Positions for measuring the transit time Figure 3 Position of the cursor for time measurement Methods 1, 2 and 3 5.3.2 Surface-breaking discontinuities The height of an indication of a surface-breaking discontinuity is determined by the maximum difference between the lateral wave and the lower-tip d
36、iffraction signal. Key 1 Scanning surface z1Start depth of discontinuity 2 Opposite surface z2End depth of discontinuity x1Start position of discontinuity h Height x2End position of discontinuity l = x2 x1length Figure 4 Height measurement definition of a scanning surface breaking discontinuity For
37、an opposite surface-breaking discontinuity, the height is determined by the maximum difference between the upper-tip diffraction signal and the back wall reflection (see Figure 5). DIN EN ISO 15626:2013-12EN ISO 15626:2013 (E) 7 Key x1Start position of discontinuity z1 Start depth of discontinuity x
38、2End position of discontinuity z2End depth of discontinuity l = x2 x1length h Height Figure 5 Height definition of an opposite surface-breaking discontinuity 5.3.3 Embedded discontinuities The height of an indication of an embedded discontinuity is determined by the maximum difference between the up
39、per-tip diffraction signal and the lower-tip diffraction signal at the same x-position (see Figure 6). Key x1Start position of discontinuity z1 Start depth of discontinuity x2 End position of discontinuity z2End depth of discontinuity l = x2 x1length h Height Figure 6 Height definition of an embedde
40、d discontinuity 6 Acceptance levels 6.1 General Classified indications are evaluated according to one of the acceptance levels listed in 6.2, 6.3 and 6.4. For welds joining two different thicknesses, the acceptance levels are based on the thinner of the two. DIN EN ISO 15626:2013-12 EN ISO 15626:201
41、3 (E) 8 For welds subject to dynamic loading or being sensitive to cracking (e.g. longitudinal, transverse), more stringent near-surface acceptance levels or the use of additional NDT techniques may be specified. The symbols h1, h2and h3used in Tables 2, 3 and 4 are explained in Figure 7. 6.2 Indica
42、tions from single discontinuities 6.2.1 Acceptance level 1 Table 2 Acceptance level 1 Thickness range Maximum allowable length if h lmax h1mm Surface-breaking indicationa h3mm Embedded indication h2mm 6 mm 100 mm 50 mm 3 5 2 aWhen indications from surface-breaking discontinuities are detected, and t
43、he resolution is not sufficient to resolve the depth, different techniques or methods shall be applied to determine the acceptability. If it is not possible to apply other techniques or methods all indications from surface-breaking discontinuities shall be considered unacceptable. ,DIN EN ISO 15626:
44、2013-12EN ISO 15626:2013 (E) 9 6.2.2 Acceptance level 2 Table 3 Acceptance level 2 Thickness range Maximum allowable length if h lmax h1mm Surface-breaking indicationa h3mm Embedded indication h2mm 6 mm 100 mm 60 mm 4 6 3 aWhen indications from surface-breaking discontinuities are detected, and the
45、resolution is not sufficient to resolve the depth, different techniques or methods shall be applied to determine the acceptability. If it is not possible to apply other techniques or methods, all indications from surface-breaking discontinuities shall be considered unacceptable. DIN EN ISO 15626:201
46、3-12 EN ISO 15626:2013 (E) 10 6.2.3 Acceptance level 3 Table 4 Acceptance level 3 Thickness range Maximum allowable length if h lmaxh1mm Surface-breaking indicationa h3mm Embedded indication h2mm 6 mm 100 mm 75 mm 5 8 4 aWhen indications from surface-breaking discontinuities are detected, and the re
47、solution is not sufficient to resolve the depth, different techniques or methods shall be applied to determine the acceptability. If it is not possible to apply other techniques or methods, all indications from surface-breaking discontinuities shall be considered unacceptable. Key 1 Acceptance for l lmax2 Acceptance for l lmax3 Rejection h1 Maximum allowable height for any discontinuity if
