1、BS EN ISO 17638:2016Non-destructive testing ofwelds Magnetic particletesting (ISO 17638:2016)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 17638:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 17638:2016. It
2、supersedes BS EN ISO 17638:2009 which iswithdrawn.The UK 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 includ
3、e all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 87799 5 ICS 25.160.40 Compliance with a British Standard cannot confer immunity from legal obligations.This Br
4、itish Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17638 November 2016 ICS 25.160.40 Supersedes EN ISO 1
5、7638:2009English Version Non-destructive testing of welds - Magnetic particle testing (ISO 17638:2016) Contrle non destructif des assemblages souds - Magntoscopie (ISO 17638:2016) Zerstrungsfreie Prfung von Schweiverbindungen - Magnetpulverprfung (ISO 17638:2016) This European Standard was approved
6、by CEN on 2 October 2016. 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 references concerning such national stan
7、dards 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 a CEN member into its own language and n
8、otified 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 Macedonia, France, Germany, Greece, Hungary,
9、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC M
10、anagement Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17638:2016 EBS EN ISO 17638:2016EN ISO 17638:2016 (E) 3 European foreword This document (EN ISO 17638:2016) has been prepa
11、red by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” 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 identi
12、cal text or by endorsement, at the latest by May 2017, and conflicting national standards shall be withdrawn at the latest by May 2017. 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 responsib
13、le for identifying any or all such patent rights. This document supersedes EN ISO 17638:2009. 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,
14、 Czech Republic, 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, Switzerland, Turkey and the United Ki
15、ngdom. Endorsement notice The text of ISO 17638:2016 has been approved by CEN as EN ISO 17638:2016 without any modification. BS EN ISO 17638:2016ISO 17638:2016(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Safety precautions 15 General 15.1 Information required prior t
16、o testing . 15.2 Additional pre-test information . 25.3 Personnel qualification 25.4 Surface conditions and preparation . 25.5 Magnetizing . 25.5.1 Magnetizing equipment . 25.5.2 Verification of magnetization 35.6 Application techniques 35.6.1 Field directions and testing area 35.6.2 Typical magneti
17、c testing techniques 65.7 Detection media . 95.7.1 General 95.7.2 Verification of detection media performance . 95.8 Viewing conditions . 105.9 Application of detection media 105.10 Overall performance test . 105.11 False indications . 105.12 Recording of indications 105.13 Demagnetization 115.14 Te
18、st report 11Annex A (informative) Variables affecting the sensitivity of magnetic particle testing .13Bibliography .15 ISO 2016 All rights reserved iiiContents PageBS EN ISO 17638:2016ISO 17638:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of natio
19、nal 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. Internati
20、onal 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 intended
21、 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 www.iso
22、.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 will
23、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 expression
24、s related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 44, Welding and allied
25、processes, Subcommittee SC 5, Testing and inspection of welds.This second edition cancels and replaces the first edition (ISO 17638:2003), which has been technically revised.Requests for official interpretations of any aspect of this document should be directed to the Secretariat of ISO/TC 44/SC 5 v
26、ia your national standards body. A complete listing of these bodies can be found at www.iso.org.iv ISO 2016 All rights reservedBS EN ISO 17638:2016INTERNATIONAL STANDARD ISO 17638:2016(E)Non-destructive testing of welds Magnetic particle testing1 ScopeThis document specifies techniques for detection
27、 of surface imperfections in welds in ferromagnetic materials, including the heat affected zones, by means of magnetic particle testing. The techniques are suitable for most welding processes and joint configurations. Variations in the basic techniques that will provide a higher or lower test sensit
28、ivity are described in Annex A.This document does not specify acceptance levels of the indications. Further information on acceptance levels for indications may be found in ISO 23278 or in product or application standards.2 Normative referencesThe following documents are referred to in the text in s
29、uch a way that some or all of their content constitutes requirements 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 3059, Non-destructive testing Penetrant testing an
30、d magnetic particle testing Viewing conditionsISO 9934-1:2015, Non-destructive testing Magnetic particle testing Part 1: General principlesISO 9934-2, Non-destructive testing Magnetic particle testing Part 2: Detection mediaISO 9934-3, Non-destructive testing Magnetic particle testing Part 3: Equipm
31、ent3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 12707 and ISO 17635 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online bro
32、wsing platform: available at http:/www.iso.org/obp4 Safety precautionsSpecial consideration shall be given to toxic, inflammable and/or volatile materials, electrical safety and unfiltered UV radiation.Magnetic particle testing often creates high magnetic fields close to the object under test and th
33、e magnetising equipment. Items sensitive to these fields should be excluded from such areas.5 General5.1 Information required prior to testingPrior to testing, the following items shall be specified (where applicable):a) specific test procedure;b) certification requirements for NDT personnel; ISO 20
34、16 All rights reserved 1BS EN ISO 17638:2016ISO 17638:2016(E)c) extent of coverage;d) state of manufacture;e) testing techniques to be used;f) overall performance test;g) any demagnetization;h) acceptance level;i) action necessary for unacceptable indications.5.2 Additional pre-test informationPrior
35、 to testing, the following additional information can also be required:a) type and designation of the parent and weld materials;b) welding process;c) location and extent of welds to be tested;d) joint preparation and dimensions;e) location and extent of any repairs;f) post-weld treatment (if any);g)
36、 surface conditions.Operators may ask for further information that could be helpful in determining the nature of any indications detected.5.3 Personnel qualificationMagnetic particle testing of welds and the evaluation of results for final acceptance shall be performed by qualified and capable perso
37、nnel. It is recommended that personnel be qualified in accordance with ISO 9712 or an equivalent standard at an appropriate level in the relevant industry sector.5.4 Surface conditions and preparationAreas to be tested shall be dry unless appropriate products for wet surfaces are used. It may be nec
38、essary to improve the surface condition, e.g. by use of abrasive paper or local grinding to permit accurate interpretation of indications.Any cleaning or surface preparation shall not be detrimental to the material, the surface finish or the magnetic testing media. Detection media shall be used with
39、in the temperature range limitations set by the manufacturer.5.5 Magnetizing5.5.1 Magnetizing equipmentGeneral magnetization requirements shall be in accordance with ISO 9934-1:2015, Clause 8.Unless otherwise specified, for example, in an application standard, the following types of alternating curr
40、ent-magnetizing equipment shall be used:a) electromagnetic yokes;2 ISO 2016 All rights reservedBS EN ISO 17638:2016ISO 17638:2016(E)b) current flow equipment with prods;c) adjacent or threading conductors or coil techniques.DC electromagnets and permanent magnets may only be used by agreement at the
41、 time of enquiry and order.The magnetizing equipment shall conform to ISO 9934-3.Where prods are used, precautions shall be taken to minimize overheating, burning or arcing at the contact tips. Removal of arc burns shall be carried out where necessary. The affected area shall be tested by a suitable
42、 method to ensure the integrity of the surface.5.5.2 Verification of magnetizationFor the verification of magnetization, see ISO 9934-1:2015, 8.2.For structural steels in welds, a tangential field between 2 kA/m to 6 kA/m (r.m.s.) is recommended.The adequacy of the surface flux density shall be esta
43、blished by one or more of the following methods:a) by testing a representative component containing fine natural or artificial discontinuities in theleast favourable locations;b) measurement of the tangential field strength as close as possible to the surface using a Hall effectprobe; the appropriat
44、e tangential field strength can be difficult to measure close to abrupt changesin the shape of a component or where flux leaves the surface of a component;c) calculation of the approximate current value in order to achieve the recommended tangential fieldstrength; the calculation can be based on the
45、 current values specified in Figure 5 and Figure 6;d) by the use of other methods based on established principles.Flux indicators (i.e. shim-type) placed in contact with the surface under test provide a guide to the magnitude and direction of the tangential field strength, but should not be used to
46、verify that the tangential field strength is acceptable.NOTE Information on b) is given in ISO 9934-3.5.6 Application techniques5.6.1 Field directions and testing areaThe detectability of an imperfection depends on the angle of its major axis with respect to the direction of the magnetic field. This
47、 is explained for one direction of magnetization in Figure 1. ISO 2016 All rights reserved 3BS EN ISO 17638:2016ISO 17638:2016(E)Key1 magnetic field direction angle between the magnetic field and the direction of the imperfection2 optimum sensitivity minminimum angle for imperfection detection3 redu
48、cing sensitivity iexample of imperfection orientation4 insufficient sensitivityFigure 1 Directions of detectable imperfectionsTo ensure detection of imperfections in all orientations, the welds shall be magnetized in two directions approximately perpendicular to each other with a maximum deviation o
49、f 30. This can be achieved using one or more magnetization methods.Testing in only one field direction is not recommended but may be carried out if specified, for example, in an application standard.When using yokes or prods, there will be an area of the component in the vicinity of each pole piece or tip that will be impossible to test due to excessive magnetic field strength. This is usually seen as furring of particles.Care shall be taken to ensure adequate overlap of the testing areas as shown in Figure 2 and Figure 3.4
