BS-EN-ISO-5817-2007.pdf

BRITISH STANDARD BS EN ISO 5817:2007 Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections The European Standard EN ISO 5817:2007 has the status of a British Standard ICS 25.160.40 ? BS EN ISO 5817:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 © BSI 2007 ISBN 978 0 580 56192 4 National foreword This British Standard is the UK implementation of EN ISO 5817:2007. It supersedes BS EN ISO 5817:2003 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/-/1, Briefing committee for welding. 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 responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 5817 August 2007 ICS 25.160.40Supersedes EN ISO 5817:2003 English Version Welding - 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) Soudage - Assemblages en acier, nickel, titane et leurs alliages soudés par fusion (soudage par faisceau exclu) - Niveaux de qualité par rapport aux défauts (ISO 5817:2003, version corrigée:2005, Corrigendum Technique 1:2006 inclus) Schweißen - Schmelzschweißverbindungen an Stahl, Nickel, Titan und deren Legierungen (ohne Strahlschweißen) - Bewertungsgruppen von Unregelmäßigkeiten (ISO 5817:2003, korrigierte Fassung:2005, einschließlich Technisches Corrigendum 1:2006) This European Standard was approved by CEN on 18 July 2007. 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 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 Centre 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, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5817:2007: E Foreword The text of ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006 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 5817:2007 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 2008, and conflicting national standards shall be withdrawn at the latest by February 2008. This document supersedes EN ISO 5817:2003. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006 has been approved by CEN as EN ISO 5817:2007 without any modifications. EN ISO 5817:2007 Reference number ISO 5817:2003(E) INTERNATIONAL STANDARD ISO 5817 Second edition 2003-10-01 Corrected version 2005-11-01 Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections Soudage Assemblages en acier, nickel, titane et leurs alliages soudés par fusion (soudage par faisceau exclu) Niveaux de qualité par rapport aux défauts EN ISO 5817:2007 ii iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 2 3 Terms and definitions. 2 4 Symbols. 3 5 Assessment of imperfections 4 Annex A (informative) Examples of determination of percentage (%) porosity 22 Annex B (informative) Additional information and guidelines for use of this International Standard 24 Bibliography. 25 EN ISO 5817:2007 iv Foreword ISO (the International Organization for Standardization) 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 represented 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees 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 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 5817 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 10, Unification of requirements in the field of metal welding. This second edition cancels and replaces the first edition (ISO 5817:1992), which has been technically revised. Extensive editorial and technical changes have been made throughout this corrected version. For example, the first paragraph of the Scope has been modified. EN ISO 5817:2007 v Introduction This International 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 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 production 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 other 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 specifically 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 expected 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 application 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 but also of inspection, test 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 terms 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 International 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 include 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, penetrate, magnetic 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 quility level B may include additional manufacturing processes, e.g. grinding, TIG dressing. Requests for official interpretations of any aspect of this International Standard should be directed to the Secretariat of ISO/TC 44/SC 10 via your national standards body. For a complete listing consult www.iso.org. EN ISO 5817:2007 blank 1 Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections 1 Scope This 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 above 0,5 mm. It covers fully penetrated butt welds and all fillet welds. The priciples of this International Standard may 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 level B corresponds to the highest requirement on the finished weld. The quality levels refer to production quality and not to the fitness-for-purpose (see 3.2) of the product manufactured. This International Standard applies to: unalloyed and alloy steels; nickel and nickel alloys; titanium and titanium alloys; manual, mechanized and automatic welding; all welding positions; all types of welds, e.g. butt welds, fillet welds and branch connections; the following welding processes and their defined sub-processes in accordance with ISO 4063: 11 metal-arc welding without gas protection; 12 submerged-arc welding; 13 gas-shielded metal-arc welding; 14 gas-shielded welding with non-consumable electrodes; 15 plasma arc welding; 31 oxy-fuel gas welding (for steel only). Metallurgical aspects, e.g. grain size, hardness, are not covered by this International Standard. EN ISO 5817:2007 2 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 2553, Welded, brazed and soldered joints Symbolic representation on drawings ISO 4063, Welding and allied processes Nomenclature of processes and reference numbers ISO 6520-1:1998, Welding and allied processes Classification of geometric imperfections in metallic materials Part 1: Fusion welding ISO 13919-1, Welding Electron and laser-beam welded joints Guidance on quality levels for imperfections Part 1: Steel 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 quality level description of the quality of a weld on the basis of type, size and amount of selected imperfections 3.2 fitness-for-purpose ability of a product, process or service to serve a defined purpose under specific conditions 3.3 short imperfections in cases when the weld is 100 mm long or longer, imperfections are considered to be short imperfections if, in the 100 mm which contains the greatest number of imperfections, their total length is less than 25 mm in cases when the weld is less than 100 mm long, imperfections are considered to be short imperfections if their total length is less than 25 % of the length of the weld 3.4 systematic imperfection imperfections that are repeatedly distributed in the weld over the weld length to be examined, the size of a single imperfection being within the specified limits 3.5 projected area area where imperfections distributed along the volume of the weld under consideration are imaged two- dimensionally NOTE In contrast to the cross-sectional area, the occurrence of imperfections is dependent on the weld thickness when exposed radiographically (see Figure 1). 3.6 cross-sectional area area to be considered after fracture or sectioning EN ISO 5817:2007 3 Key 1 X-ray detection 3 6-fold thickness 5 2-fold thickness 2 4 pores per volume unit 4 3-fold thickness 6 1-fold thickness Figure 1 Radiographic films of specimens with identical occurrence of pores per volume unit 4 Sy