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1、BRITISH STANDARD BS EN 25817:1992 ISO 5817:1992 Arc-welded joints in steel Guidance on quality levels for imperfections The European Standard EN 25817:1992 has the status of a British Standard UDC 621.791.75.053:669.14:621.791.019 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:26:02 GMT+0
2、0:00 2006, Uncontrolled Copy, (c) BSI BS EN 25817:1992 This British Standard, having been prepared under the direction of the Welding Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1992 BSI 02-1999 The following BSI references
3、 relate to the work on this standard: Committee reference WEE/-/1 Draft for comment 87/71566 DC ISBN 0 580 21245 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations o
4、f the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for
5、 Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Port
6、ugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffiel
7、dun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 25817:1992 BSI 02-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 258173 National annex NA (informative) Committees responsibleInside back cover National annex NB (i
8、nformative) Cross-referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 25817:1992 ii BSI 02-1999 National foreword This British Standard has been prepared under the direction of the Welding Standards Policy Commi
9、ttee and is the English language version of EN 25817, Arc-welded joints in steel Guidance on quality levels for imperfections, published by the European Committee for Standardization (CEN). EN 25817:1992 is identical with ISO 5817:1992 published by the International Organization for Standardization
10、(ISO). EN 25817 was produced as a result of international discussion in which the UK took an active part. There has previously been no direct British Standard equivalent to this standard. It is simply intended as a possible reference/guidance for application standards for designers if, and when, so
11、required. To avoid confusion, it is emphasised that levels of detectable imperfection quoted are purely arbitrary and intended for quality control purposes only. The various levels may be referred to in whole, in part or in combination, or it may be decided that for particular purposes, other levels
12、 are more appropriate. Consideration of any specific requirements from this standard should be at the time of the enquiry/contract stage and agreed between the contracting parties. It is assumed that the execution of the provisions of the document is entrusted to suitably qualified and experienced p
13、ersons. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document co
14、mprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 14, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover
15、. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 25817 July 1992 UDC 621.791.75.053:669.14:621.791.019 Descriptors: Welded joints, arc welding, steels, acceptance testing, weld defects, a
16、cceptability English version Arc-welded joints in steel Guidance on quality levels for imperfections (ISO 5817:1992) Assemblages en acier soud larc Guide des niveaux dacceptation des dfauts (ISO 5817:1992) Lichtbogenschweiverbindungen an Stahl Richtlinie fr Bewertungsgruppen fr Unregelmigkeiten (ISO
17、 5817:1992) This European Standard was approved by CEN on 1992-07-03. 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 bibliographi
18、cal references concerning such national standards may be obtained on application to the Central Secretariat 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
19、member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
20、Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1992 Copyright reserved to CEN members Ref. No. EN 25817:1992 E Licensed Copy: sheffieldun sheffie
21、ldun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 25817:1992 BSI 02-1999 2 Foreword In 1991 CEN Technical Committee CEN/TC 121 “Welding” decided to submit ISO 5817:1992 “Arc-welded joints in steel Guidance on quality levels for imperfections” to the Unique Acceptance Proced
22、ure. The result was positive. National standards identical to this European Standard shall be published at the latest by 1993-01-31 and conflicting national standards shall be withdrawn at the latest by 1993-01-31. According to the CEN/CENELEC Common Rules, the following countries are bound to imple
23、ment this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 Introduction3 1Scope3 2Normative references4 3Definitions4 4Symbols4 5E
24、valuation of welds4 Table 0.1 Quality levels for weld imperfections3 Table 1 Limits for imperfections5 Annex A (informative) Additional information and guidelines for use of this International Standard13 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Cop
25、y, (c) BSI EN 25817:1992 BSI 02-19993 Introduction This International Standard should be used as a reference in the drafting of application codes and/or other application standards. It may be used within a total quality system for the production of satisfactory welded joints. It provides three sets
26、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 level shall be pres
27、cribed before the start of production, preferably at the inquiry or order stage. For special purposes, additional details may need to be prescribed. The quality levels given in this International Standard are intended to provide basic reference data and are not specifically related to any particular
28、 application. They refer to the types of welded joints in a fabrication and not to the complete product or component itself. It is possible, therefore, for different quality levels to be applied to individual welded joints in the same product or component. Quality levels are listed in Table 0.1. Tab
29、le 0.1 Quality levels for weld imperfections The three quality levels are arbitrarily identified as D, C and B and are intended to cover the majority of practical applications. It would normally be hoped that for a particular welded joint the dimensional limits for imperfections could all be covered
30、 by specifying one quality level. In some cases, however, e.g. for certain type of steels and structures as well as for fatigue loading or leak tightness applications, it may be necessary to specify different quality levels for different imperfections in the same welded joint or to include additiona
31、l requirements. 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 im
32、portant and should include not only the cost of welding but also that of inspection, test and repair. Although this International Standard includes types of imperfections relevant to the arc welding processes given in clause 1, only those which are applicable to the process and application in questi
33、on 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
34、 specified in the application standard or contract. This International Standard does not include details of recommended methods of detection and sizing and, therefore, it needs to be supplemented by requirements for examination, inspection and testing. It should be appreciated that methods of non-de
35、structive examination may not be able to give the detection, characterization and sizing necessary for use within certain types of imperfections shown in Table 1. Although this International Standard covers a material thickness range of 3 mm to 63 mm, it may well be applicable to thicker or thinner
36、joints provided consideration is given to those technical factors which may influence the situation. 1 Scope This International Standard provides guidance on levels of imperfections in arc-welded joints in steel. Three levels are given in such a way as to permit application for a wide range of welde
37、d fabrications. The levels refer to production quality and not to the fitness-for-purpose (see 3.1) of the product manufactured. This International Standard applies to unalloyed and alloyed steels; the following welding processes and their defined sub-processes in accordance with ISO 4063: 11 metal-
38、arc welding without gas protection; 12 submerged-arc welding; 13 gas-shielded metal-arc welding; 14 gas-shielded welding with non-consumable electrode; 15 plasma arc welding; manual, mechanized and automatic processes; all welding positions; butt welds, fillet welds and branch connections; materials
39、 in the thickness range 3 mm to 63 mm. Level symbolQuality level DModerate CIntermediate BStringent Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:26:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 25817:1992 4 BSI 02-1999 When significant deviations from the joint geometries and dimensi
40、ons described in this International Standard are present in the welded product, it is necessary to evaluate to what extent the provisions of this standard can apply. Metallurgical aspects, e.g. grain size, hardness, are not covered by this International Standard. 2 Normative references The following
41、 standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encourag
42、ed to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2553:1984, Welds Symbolic representation on drawings. ISO 4063:1990, Welding, brazing, soldering and braz
43、e welding of metals Nomenclature of processes and reference numbers for symbolic representation on drawings. ISO 6520:1982, Classification of imperfections in metallic fusion welds, with explanations. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1
44、 fitness-for-purpose a product is fit for its intended purpose when it functions satisfactorily in service during its stipulated lifetime. The product may deteriorate in service, but not to such a degree that fracture and subsequent failure occurs. Products may, of course, be misused or overloaded;
45、it is presumed that the actual conditions during service correspond to the intended conditions, including statistical variations, e.g. live loads 3.2 Weld thickness 3.2.1 fillet weld thickness, a; nominal throat thickness height of the largest isosceles triangle that can be inscribed in the weld sec
46、tion (see ISO 2553) NOTE 1 In countries in which the leg length, z, is used as the dimension of a fillet weld, the limits for imperfections may be reformulated so that they refer to the leg length. 3.2.2 butt weld thickness, s minimum distance from the surface of the part to the bottom of the penetr
47、ation, which cannot be greater than the thickness of the thinner of the parts (see ISO 2553) 3.3 short imperfections one or more imperfections of total length not greater than 25 mm in any 100 mm length of the weld or a maximum of 25 % of the weld length for a weld shorter than 100 mm 3.4 long imper
48、fection one or more imperfections of total length greater than 25 mm in any 100 mm length of the weld or a minimum of 25 % of the weld length for a weld shorter than 100 mm 3.5 projected area area given by length of weld examined multiplied by the maximum width of weld 3.6 surface crack area area to
49、 be considered after fracture 4 Symbols The following symbols are used in Table 1. 5 Evaluation of welds Limits for imperfections are given in Table 1. A welded joint should normally be evaluated separately for each individual type of imperfection (Nos. 1 to 25). Different types of imperfection occuring at any cross-section of the joint may need special consideration (see No. 26). anominal fillet weld throat thickness (fillet thickness) bwidth of weld reinforcement ddiameter of pore hsize (height or width) of imperfecti