1、BSI Standards PublicationBS EN ISO 23278:2015Non-destructive testing ofwelds Magnetic particletesting Acceptance levelsBS EN ISO 23278:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 23278:2015. It supersedes BS EN ISO 23278:2009 which iswithdrawn.The U
2、K participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are
3、 responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 87082 8 ICS 25.160.40 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the
4、 Standards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 23278 March 2015 ICS 25.160.40 Supersedes EN ISO 23278:2009English Version Non-destructive testing of welds - M
5、agnetic particle testing - Acceptance levels (ISO 23278:2015) Contrle non destructif des assemblages souds - Contrle par magntoscopie - Niveaux dacceptation (ISO 23278:2015) Zerstrungsfreie Prfung von Schweiverbindungen - Magnetpulverprfung von Schweiverbindungen - Zulssigkeitsgrenzen (ISO 23278:201
6、5) This European Standard was approved by CEN on 8 November 2014. CEN members are bound to comply with the 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
7、references concerning such national standards may be obtained on application to the CEN-CENELEC Management 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
8、a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status 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 Mace
9、donia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUR
10、OPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 23278 EBS EN ISO 23278:2015EN ISO 23278:2015 (E) 3 Foreword This document (EN ISO
11、 23278:2015) has been prepared by Technical Committee ISO/TC 44 “Welding andallied processes“ in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” thesecretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by
12、 publication of an identicaltext or by endorsement, at the latest by September 2015, and conflicting national standards shall bewithdrawn at the latest by September 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. CEN and/or C
13、ENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 23278:2009. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Be
14、lgium, Bulgaria, Croatia, Cyprus, CzechRepublic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzer
15、land, Turkey and the United Kingdom. Endorsement notice The text of ISO 23278:2015 has been approved by CEN as EN ISO 23278:2015 without any modification. BS EN ISO 23278:2015ISO 23278:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Testing parameters 15 Acceptance
16、levels . 25.1 General . 25.2 Removal of imperfections 2Annex A (informative) Recommended testing parameters 3Bibliography 4 ISO 2015 All rights reserved iiiContents PageBS EN ISO 23278:2015ISO 23278:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of
17、national standards bodies (ISO member bodies). The work of preparing International 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. Inte
18、rnational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those int
19、ended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see ww
20、w.iso.org/directives).Attention is drawn to the possibility 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. Details of any patent rights identified during the development of the document
21、will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expre
22、ssions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 44, Welding and allied processes, Subc
23、ommittee SC 5, Testing and inspection of welds.This second edition cancels and replaces the first edition (ISO 23278:2006), which has been technically revised.iv ISO 2015 All rights reservedBS EN ISO 23278:2015Non-destructive testing of welds Magnetic particle testing Acceptance levels1 ScopeThis In
24、ternational Standard specifies acceptance levels for indications from imperfections in ferromagnetic steel welds detected by magnetic particle testing.The acceptance levels are primarily intended for use during manufacture examination.NOTE They can also be used for in-service inspection.The acceptan
25、ce levels in this International Standard are based on detection capabilities that can be expected when using techniques specified in ISO 17638 and parameters recommended in Annex A. The acceptance levels can be related to welding standards, application standards, specifications or codes. Such a rela
26、tionship is shown in ISO 17635 for ISO 5817.Acceptance levels for grouped indications are not covered by this International Standard.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated re
27、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO/TS 18173, Non-destructive testing General terms and definitions3 Terms and definitionsFor the purposes of this document, the terms and definitions gi
28、ven in ISO/TS 18173 and the following apply.3.1linear indicationlindication having a length greater than three times its width3.2non-linear indicationdindication having a length less than or equal to three times its width4 Testing parametersMany parameters, either individually or in combination, wil
29、l affect the ability of a technique to detect imperfections of a given size and orientation with respect to the condition of the test surface.Detection of small imperfections is highly dependent on the surface condition of the weld and the detection media used. Examples of the application of these p
30、arameters to give a high probability of detection are given in Annex A.INTERNATIONAL STANDARD ISO 23278:2015(E) ISO 2015 All rights reserved 1BS EN ISO 23278:2015ISO 23278:2015(E)5 Acceptance levels5.1 GeneralThe width of the test surface shall include the weld metal and the adjacent parent metal up
31、 to a distance of 10 mm on each side.Acceptance levels prescribed for linear indications are those corresponding to the evaluation level. Indications lower than this shall not be taken into account. Acceptable indications do not have to be recorded.Any adjacent indications separated by less than the
32、 major dimension of the smaller shall be assessed as a single, continuous indication.Local grinding may be used to improve the classification of all or just part of a test surface, when it is required to work to a higher detection limit than that expected by the existing weld surface condition.Accep
33、tance levels are given in Table 1.Table 1 Acceptance levels for indications from imperfectionsDimensions in millimetresType of indicationAcceptance levela1 2 3Linear indicationl = length of indicationl 1,5 l 3 l 6Non-linear indicationd = major axis dimensiond 2 d 3 d 4aAcceptance levels 2 and 3 may
34、be specified with a suffix “X”, which denotes that all linear indications detected shall be assessed to level 1. However, the probability of detection of indications smaller than those denoted by the original acceptance level can be low.5.2 Removal of imperfectionsWhere the product specification per
35、mits, local grinding may be used to reduce or remove imperfections which are the cause of unacceptable indications. All such areas shall be re-tested and evaluated with the same magnetic system and technique.2 ISO 2015 All rights reservedBS EN ISO 23278:2015ISO 23278:2015(E)Annex A (informative) Rec
36、ommended testing parametersRecommended testing parameters for reliable detection of small imperfections are given in Table A.1. The surfaces are in the as-welded condition. It may be necessary to improve the surface condition, e.g. by abrasive paper or local grinding, to permit accurate interpretati
37、on of indications. The detection media are given in order of preference.Table A.1 Recommended testing parametersAcceptance level Surface condition Detection media1 Fine surface aFluorescent or colour contrast with contrast aid2 Smooth surface bFluorescent or colour contrast with contrast aid3 Genera
38、l surface cColour contrast with contrast aid or fluo-rescent with low sensitivityaThe weld cap and parent material offer smooth clean surfaces with negligible undercut, rippling and spatter. The surface finish is typical of welds, made by automatic TIG-welding; submerged arc welding (fully mechanize
39、d) and manual metal arc welding with iron powder electrodes.bThe weld cap and parent material offer reasonably smooth surfaces with minimal undercut, rippling and spatter. The surface finish is typical of welds made by manual metal arc welding vertical downwards and MAG-welding using argon rich gas
40、for the capping runs.cThe weld cap and parent material are in the as-welded condition. The surface finish is typical of welds made by manual metal arc welding or MAG-welding in any position. ISO 2015 All rights reserved 3BS EN ISO 23278:2015ISO 23278:2015(E)Bibliography1 ISO 5817, Welding Fusion-wel
41、ded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections2 ISO 17635, Non-destructive testing of welds General rules for metallic materials3 ISO 17638, Non-destructive testing of welds Magnetic particle testing4 ISO 2015 All rights reservedBS EN
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