1、BSI Standards PublicationBS EN ISO 5817:2014Welding Fusion-weldedjoints in steel, nickel, titaniumand their alloys (beam weldingexcluded) Quality levels forimperfectionsBS EN ISO 5817:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 5817:2014.It supersed
2、es BS EN ISO 5817:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/-/1, Briefing committee for welding.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include
3、all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 76234 5ICS 25.160.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British S
4、tandard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5817 February 2014 ICS 25.160.40 Supersedes EN ISO 5817:2007English Version Weldin
5、g - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections (ISO 5817:2014) Soudage - Assemblages en acier, nickel, titane et leurs alliages souds par fusion (soudage par faisceau exclu) - Niveaux de qualit par rapport aux dfauts (I
6、SO 5817:2014)Schweien - Schmelzschweiverbindungen an Stahl, Nickel, Titan und deren Legierungen (ohne Strahlschweien) - Bewertungsgruppen von Unregelmigkeiten (ISO 5817:2014) This European Standard was approved by CEN on 4 January 2014. CEN members are bound to comply with the CEN/CENELEC Internal R
7、egulations 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 Management Centre or to any CEN m
8、ember. 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 as the official versions
9、. 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, Netherlands, Norway, Pola
10、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation
11、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5817:2014 EBS EN ISO 5817:2014EN ISO 5817:2014 (E) 3 Foreword This document (EN ISO 5817:2014) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical C
12、ommittee 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 August 2014, and conflicting national standards shall be withdrawn at the lat
13、est by August 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 supersedes EN ISO 5817:2007. According to the CEN-CE
14、NELEC 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 Macedonia, France, Germany, Greece, Hungary,
15、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 5817:2014 has been approved by CEN as EN ISO 5817:2014 without any modifica
16、tion. BS EN ISO 5817:2014ISO 5817:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Symbols 35 Assessment of imperfections . 4Annex A (informative) Examples of determination of percentage (%) porosity .21Anne
17、x B (informative) Additional information and guidelines for use of this International Standard .23Annex C (informative) Additional requirements for welds in steel subject to fatigue 24Bibliography .27BS EN ISO 5817:2014ISO 5817:2014(E)ForewordISO (the International Organization for Standardization)
18、is a worldwide federation of 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 repres
19、ented on that committee. International 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 develo
20、p this document and those intended 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/I
21、EC Directives, Part 2. www.iso.org/directivesAttention 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 devel
22、opment of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny 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 specifi
23、c terms and expressions 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 informationThe committee responsible for this document is ISO/TC 44, Welding and allied
24、 processes, Subcommittee SC 10, Unification of requirements in the field of metal welding.This third edition cancels and replaces the second edition (ISO 5817:2003,), which has been technically revised. It also incorporates Technical Corrigendum ISO 5817:2003/Cor 1:2006.Requests for official interpr
25、etations of any aspect of this International Standard should be directed to the Secretariat of ISO/TC 44/SC 10 via your national standards body. A complete listing of these bodies can be found at www.iso.org.iv ISO 2014 All rights reservedBS EN ISO 5817:2014ISO 5817:2014(E)IntroductionThis Internati
26、onal Standard should be used as a reference in the drafting of application codes and/or other application standards. It contains a simplified selection of fusion weld imperfections based on the designations given in ISO 6520-1.Some of the imperfections described in ISO 6520-1 have been used directly
27、 and some have been grouped together. The basic numerical referencing system from ISO 6520-1 has been used.The purpose of this International Standard is to define dimensions of typical imperfections which might be expected in normal fabrication. It may be used within a quality system for the product
28、ion of welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application. The quality level necessary in each case should be defined by the application standard or the responsible designer in conjunction with the manufacturer, user and/or oth
29、er parties concerned. The quality level shall be prescribed before the start of production, preferably at the enquiry or order stage. For special purposes, additional details may be prescribed.The quality levels given in this International Standard provide basic reference data and are not specifical
30、ly related to any particular application. They refer to types of welded joint in fabrication and not to the complete product or component itself. It is possible, therefore, that different quality levels are applied to individual welded joints in the same product or component.It would normally be exp
31、ected that for a particular welded joint the dimensional limits for imperfections could all be covered by specifying one quality level. In some cases, it may be necessary to specify different quality levels for different imperfections in the same welded joint.The choice of quality level for any appl
32、ication should take account of design considerations, subsequent processing (e.g. surfacing), mode of stressing (e.g. static, dynamic), service conditions (e.g. temperature, environment) and consequences of failure. Economic factors are also important and should include not only the cost of welding
33、but also of inspection, testing and repair.Although this International Standard includes types of imperfection relevant to the fusion welding processes listed in Clause 1, only those which are applicable to the process and application in question need to be considered.Imperfections are quoted in ter
34、ms of their actual dimensions, and their detection and evaluation may require the use of one or more methods of non-destructive testing. The detection and sizing of imperfections is dependent on the inspection methods and the extent of testing specified in the application standard or contract.This I
35、nternational Standard does not address the methods used for the detection of imperfections. However, ISO 17635 contains a correlation between the quality level and acceptance level for different NDT methods.This International Standard is directly applicable to visual testing of welds and does not in
36、clude details of recommended methods of detection or sizing by non-destructive means. It should be considered that there are difficulties in using these limits to establish appropriate criteria applicable to non-destructive testing methods such as ultrasonic, radiographic, eddy current, penetrant, m
37、agnetic particle testing and may need to be supplemented by requirements for inspection, examining and testing.The values given for imperfections are for welds produced using normal welding practice. Requirements for smaller (more stringent) values as stated in quality level B may include additional
38、 manufacturing processes, e.g. grinding, TIG dressing.Annex C gives additional guidance for welds subject to fatigue. ISO 2014 All rights reserved vBS EN ISO 5817:2014BS EN ISO 5817:2014Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels fo
39、r imperfections1 ScopeThis International Standard provides quality levels of imperfections in fusion-welded joints (except for beam welding) in all types of steel, nickel, titanium and their alloys. It applies to material thickness 0,5 mm. It covers fully penetrated butt welds and all fillet welds.
40、Its principles can also be applied to partial-penetration butt welds.(Quality levels for beam welded joints in steel are presented in ISO 13919-1.)Three quality levels are given in order to permit application to a wide range of welded fabrication. They are designated by symbols B, C and D. Quality l
41、evel B corresponds to the highest requirement on the finished weld.Several types of loads are considered, e.g. static load, thermal load, corrosion load, pressure load. Additional guidance on fatigue loads is given in Annex C.The quality levels refer to production and good workmanship.This Internati
42、onal Standard is applicable toa) non-alloy and alloy steels,b) nickel and nickel alloys,c) titanium and titanium alloys,d) manual, mechanized and automatic welding,e) all welding positions,f) all types of welds, e.g. butt welds, fillet welds and branch connections, andg) the following welding proces
43、ses and their sub-processes, as defined in ISO 4063: 11 metal-arc welding without gas protection; 12 submerged-arc welding; 13 gas-shielded metal-arc welding; 14 gas-shielded arc welding with non-consumable tungsten electrodes; 15 plasma arc welding; 31 oxy-fuel gas welding (for steel only).Metallur
44、gical aspects, e.g. grain size, hardness, 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 references, only the edition cited applies. Fo
45、r undated references, the latest edition of the referenced document (including any amendments) applies.INTERNATIONAL STANDARD ISO 5817:2014(E) ISO 2014 All rights reserved 1BS EN ISO 5817:2014ISO 5817:2014(E)ISO 6520-1:2007, Welding and allied processes Classification of geometric imperfections in m
46、etallic materials Part 1: Fusion welding3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1quality leveldescription of the quality of a weld on the basis of type, size and amount of selected imperfections3.2fitness-for-purposeability of a product,
47、process or service to serve a defined purpose under specific conditions3.3short imperfectionsimperfections whose total length is not greater than 25 mm in the 100 mm of the weld which contains the greatest number of imperfections3.4short imperfectionsimperfections whose total length is not greater t
48、han 25 % of the length of the weld3.5systematic imperfectionsimperfections that are repeatedly distributed in the weld over the weld length to be examined, the size of a single imperfection being within the specified limits3.6projected areaarea where imperfections distributed along the volume of the
49、 weld under consideration are imaged two-dimensionallyNote 1 to entry: In contrast to the cross-sectional area, the occurrence of imperfections is dependent on the weld thickness when exposed radiographically (see Figure 1).3.7cross-sectional areaarea to be considered after fracture or sectioning3.8smooth weld transitioneven surface with no irregularities or sharpness at the transition between the weld bead and the parent material3.9fatigue classFATxclassification reference to S-N curve, in which x is the stress range in MPa at 2 106cyclesN
