1、BS EN ISO17638:2009ICS 25.160.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDNon-destructive testingof welds Magneticparticle testing (ISO17638:2003)Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reprod
2、uction or networking permitted without license from IHS-,-,-This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31January 2010 BSI 2010ISBN 978 0 580 66701 5Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 17638:2009National f
3、orewordThis British Standard is the UK implementation of EN ISO 17638:2009. It is identical to ISO 17638:2003. It supersedes BS EN 1290:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing.A list of organizations represe
4、nted 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 responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Copyright Eur
5、opean Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17638 November 2009 ICS 25.160.40 Supersedes EN 1290:1998English Version Non-destructi
6、ve testing of welds - Magnetic particle testing (ISO 17638:2003) Contrle non destructif des assemblages souds - Contrle par magntoscopie (ISO 17638:2003) Zerstrungsfreie Prfung von Schweiverbindungen - Magnetpulverprfung (ISO 17638:2003) This European Standard was approved by CEN on 24 October 2009.
7、 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 standards may be obtained on
8、application to the CEN 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 notified to the CEN Management Cen
9、tre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
10、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by a
11、ny means reserved worldwide for CEN national Members. Ref. No. EN ISO 17638:2009: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 17638:2009EN ISO 17638:2009 (E) 3 For
12、eword The text of ISO 17638:2003 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 17638:2009 by Technical Committee CEN/TC 121 “Welding” the secretariat of which is held by
13、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 May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010. Attention is drawn to the possibility that some of t
14、he 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 supersedes EN 1290:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the foll
15、owing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slo
16、venia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 17638:2003 has been approved by CEN as a EN ISO 17638:2009 without any modification. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or ne
17、tworking permitted without license from IHS-,-,-BS EN ISO 17638:2009ISO 17638:2003(E) ISO 2003 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Safety precautions 1 5 General. 2 5.1 Information required prior to testing 2 5.2 Addition
18、al pre-test information . 2 5.3 Personnel qualification. 2 5.4 Surface conditions and preparation . 2 5.5 Magnetizing . 3 5.6 Application techniques. 4 5.7 Detection media 9 5.8 Viewing conditions . 10 5.9 Application of detection media 10 5.10 Overall performance test 10 5.11 False indications . 10
19、 5.12 Recording of indications 11 5.13 Demagnetization . 11 5.14 Test report 11 Annex A (informative) Variables affecting the sensitivity of magnetic particle testing 13 Bibliography . 15 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduc
20、tion or networking permitted without license from IHS-,-,-BS EN ISO 17638:2009ISO 17638:2003(E) iv ISO 2003 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internati
21、onal 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 IS
22、O, also 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 co
23、mmittees 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
24、 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. ISO 17638 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 5, Testing and inspecti
25、on of welds. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 17638:2009INTERNATIONAL STANDARD ISO 17638:2003(E) ISO 2003 All rights reserved 1Non-destructive testing of
26、 welds Magnetic particle testing 1 Scope This International Standard specifies techniques for detection 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 j
27、oint configurations. Variations in the basic techniques that will provide a higher or lower test sensitivity, are described in Annex A. This International Standard does not specify acceptance levels of the indications. Further information on acceptance levels for indications may be found in EN 1291
28、or in product or application standards. 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 amendme
29、nts) applies. ISO 3059, Non-destructive testing Penetrant testing and magnetic particle testing Viewing conditions ISO 9934-2, Non-destructive testing Magnetic particle testing Part 2: Detection media ISO 9934-3, Non-destructive testing Magnetic particle testing Part 3: Equipment ISO 17635, Non-dest
30、ructive testing of welds General rules for fusion welds in metallic materials 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 17635 apply. 4 Safety precautions International, national and local safety and environmental protection regulations shall be
31、 observed at all times. Special consideration shall be given to toxic, inflammable and/or volatile materials, electrical safety and unfiltered UV radiation. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted wi
32、thout license from IHS-,-,-BS EN ISO 17638:2009ISO 17638:2003(E) 2 ISO 2003 All rights reserved5 General 5.1 Information required prior to testing Prior to testing, the following items shall be specified (where applicable): a) specific test procedure; b) certification requirements for NDT personnel;
33、 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 information Prior to testing, the following additional information ca
34、n 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) surface conditions. Operators may ask for fu
35、rther information that could be helpful in determining the nature of any indications detected. 5.3 Personnel qualification Magnetic particle testing of welds and the evaluation of results for final acceptance shall be performed by qualified and capable personnel. It is recommended that personnel be
36、qualified in accordance with ISO 9712 or an equivalent standard at an appropriate level in the relevant industry sector. 5.4 Surface conditions and preparation Areas to be tested shall be free from scale, oil, grease, weld spatter, machining marks, dirt, heavy and loose paint and any other foreign m
37、atter that can affect the sensitivity of the test method. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 17638:2009ISO 17638:2003(E) ISO 2003 All rights reserved 3It m
38、ay be necessary 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. 5.5 Magnetizing 5.5.1 M
39、agnetizing equipment Unless otherwise specified, e.g., in an application standard, the following types of alternating current-magnetizing equipment shall be used: a) electromagnetic yokes; b) current flow equipment with prods; c) adjacent or threading conductors or coil techniques. The use of direct
40、 current-magnetization or permanent magnets shall be specified prior to testing. 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 nec
41、essary. The affected area shall be tested by a suitable method to ensure the integrity of the surface. 5.5.2 Verification of magnetization A tangential magnetic field strength of 2 kA/m to 6 kA/m (r.m.s.) is recommended. Verification of the magnetic field strength shall be carried out using one of t
42、he following methods: a) a component containing fine, natural or artificial imperfections in the least favourable locations; b) measurement of the tangential field strength as close as possible to the surface using a Hall effect probe. The appropriate tangential field strength can be difficult to me
43、asure close to abrupt changes in 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 field strength; the calculation can be based on the current values specified in Figures 5 and 6;
44、d) other methods based on established principles. NOTE Flux indicators, placed in contact with the surface being tested, can provide a guide to the magnitude and direction of the tangential field, but should not be used to verify that the field strength is acceptable. Copyright European Committee fo
45、r Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 17638:2009ISO 17638:2003(E) 4 ISO 2003 All rights reserved5.6 Application techniques 5.6.1 Field directions and testing area The detectability of an im
46、perfection depends on the angle of its major axis with respect to the direction of the magnetic field. This is explained for one direction of magnetization in Figure 1. is the angle between the magnetic field and the direction of the imperfection. minis the minimum angle for imperfection detection.
47、iis an example of imperfection orientation. Key 1 magnetic field direction 2 optimum sensitivity 3 reducing sensitivity 4 insufficient sensitivity Figure 1 Directions of detectable imperfections To ensure detection of imperfections in all orientations, the welds shall be magnetized in two directions
48、 approximately perpendicular to each other with a maximum deviation of 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, e.g., 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 F
