1、BRITISH STANDARD BS EN ISO 13919-1:1997 Welding Electron and laser beam welded joints Guidance on quality levels for imperfections Part 1: Steel The European Standard EN ISO 13919-1:1996 has the status of a British Standard ICS 25.160.40BSENISO13919-1:1997 This British Standard, having been prepared
2、 under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference WEE/-/1 Draft for comment 94/705804 DC ISBN 0 580
3、26356 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee WEE/-/1, Briefing committee for welding, where the following BSICommittees were represented: WEE/1, Definitions and symbols for welding WEE/2, Welding tests WEE/6, E
4、lectric arc welding equipment WEE/17, Metal-arc welding of steel WEE/18, Gas welding and cutting appliances WEE/19, Brazing and braze welding WEE/21/7, Field welding of pipelines WEE/36, Approval testing of welding procedures and welders WEE/39, Welding consumables WEE/40, Health and safety in weldi
5、ng WEE/45, Welding of stainless steel The Welding Institute (TWI) was also involved in the drafting of this standard. Amendments issued since publication Amd. No. Date CommentsBSENISO13919-1:1997 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Te
6、xt of EN ISO 13919-1 3 List of references Inside back coverBSENISO13919-1:1997 ii BSI 11-1998 National foreword This British Standard has been prepared by Technical Committee WEE/-/1 and is the English language version of EN ISO 13919-1:1996, Welding Electrons and laser beam welded joints Guidance o
7、n quality levels for imperfections Part1: Steel published by the European Committee for Standardization (CEN). It is identical with ISO 13919-1:1996 published by the International Organization for Standardization (ISO). EN ISO 13919-1 was produced as the result of international discussion in which t
8、he UK took an active part. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Sta
9、ndards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard EN 25817:1992 BS EN 25817:1992 Arc welded joints in steel. Guidance on quality l
10、evels for imperfections EN 26520:1982 BS EN 226520:1992 Classification of imperfections in metallic fusion welds, with explanations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 10, an inside back cover and a back cover. T
11、his standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13919-1 August 1996 25.160.40 Descriptors: Welding, steels, electric welding, f
12、usion welding, electron beam welding, welded joints, defects, weld defects, classification, quality classes English version Welding Electrons and laser beam welded joints Guidance on quality levels for imperfections Part 1: Steel (ISO 13919-1:1996) Soudage Assemblages souds par faisceau dlectrons et
13、 par faisceau laser Guide des niveaux de qualit des dfauts Partie 1: Acier (ISO 13919-1:1996) Schweien Elektronen- und Laserstrahl-Schweiverbindungen Leitfaden fr Bewertungsgruppen fr Unregelmigkeiten Teil 1: Stahl (ISO 13919-1:1996) This European Standard was approved by CEN on 1996-07-10. CEN memb
14、ers 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 applicati
15、on 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 member into its own language and notified to the Central Secretariat has the s
16、ame 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, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardiza
17、tion Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 13919-1:1996 EENISO13919-1:1996 BSI 11-1998 2 Foreword The text of EN ISO 13919-1:1996 has been prepared by Technical Com
18、mittee CEN/TC 121, Welding, the secretariat of which is held by DS, in collaboration with Technical Committee ISO/TC 44, Welding and allied processes. This European Standard is composed of the two following parts: Part 1: Steel; Part 2: Aluminium and its weldable alloys. This European Standard shall
19、 be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1997, and conflicting national standards shall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards o
20、rganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 Introduc
21、tion 3 1 Scope 3 2 Normative references 4 3 Symbols 4 4 Evaluation of welds 4 Table 1 Quality levels for weld imperfections 3 Table 2 Imperfections 5 Annex A (informative) Additional information for use of this standard 9ENISO13919-1:1996 BSI 11-1998 3 Introduction This European standard should be u
22、sed as a reference in the drafting of application codes and/or for other application standards. It may be used within a total quality system for the production of satisfactory welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application.
23、 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 prescribed before the start of production, preferably at the inquiry or order stage. For s
24、pecial purposes, additional details may need to be prescribed. The quality levels given in this standard are intended to provide basic reference data and are not specifically related to any particular application. They refer to welded joints and not the complete product or component itself. It is po
25、ssible, therefore, for different quality levels to be applied to individual welded joints in the same product or component. Quality levels are listed in Table 1. Table 1 Quality levels for weld imperfections The three quality levels are arbitrarily identified as D, C and B and are intended to cover
26、the majority of practical applications. If higher requirements are made on welds than compatible with the above levels (e.g. for dynamic loading) such welds may be machined or ground after welding in order to remove surface imperfections. It would normally be hoped that for a particular welded joint
27、 the dimensional limits for imperfections could all be covered by specifying one quality level. In some cases, however, e.g. for certain types 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
28、imperfections in the same welded joint or to include additional 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
29、), and consequences of failure. Economic factors are also important and should include not only the cost of welding but also that of inspection, test and repair. Although this standard includes types of imperfections relevant to the electron and laser beam welding processes, only those which are app
30、licable 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
31、the inspection methods and the extent of testing specified in the application standard or contract. This 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
32、appreciated that methods of non-destructive examination may not be able to give the detection, characterisation and sizing necessary for use within certain types of imperfections shown in Table 2. Although this standard covers a material thicknesses (penetration depths) from 0,5 mm and above for ele
33、ctron and laser beam welding. It should be noted that the permitted size for all types of imperfection has an absolute, upper limit. Application for thicknesses above 50 mm for electron beam welding and 12 mm for laser beam welding is, for that reason, usually safe, but may be overly conservative an
34、d may require special precautions, such as weld bead dressing in order to comply with the limits for reinforcement and undercut. Attention should be paid to such precautions during approval testing of the welding procedure and alternative requirements may have to be specified, if necessary. 1 Scope
35、This standard gives guidance on levels of imperfections in electron and laser beam welded joints in steel. Three levels are given in such a way as to permit application for a wide range of welded fabrications. The levels refer to production quality and not to the fitness-for-purpose of the product m
36、anufactured. This standard applies to electron and laser beam welding of: unalloyed and alloyed steels; all types of welds welded with or without additional filler wire; materials equal to or above 0,5 mm thickness for electron and laser beam welding. Level symbol Quality level D Moderate C Intermed
37、iate B StringentENISO13919-1:1996 4 BSI 11-1998 When significant deviations from the joint geometries and dimensions stated in this 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
38、, hardness are not covered by this standard. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated re
39、ferences, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the lates edition of the publication referred to applies. EN 25817, Arc welded joints in steel Guidance on qualit
40、y levels for imperfections. (ISO5817:1992) EN 26520, Classification of imperfections in metallic fusion welds, with explanations. (ISO6520:1982) 3 Symbols The following symbols are used in Table 2: 4 Evaluation of welds Limits for imperfections are given in Table 2. A welded joint should normally be
41、 evaluated separately for each individual type of imperfection. Different types of imperfection occurring at any cross-section of the joint may need special consideration. DL distance between two imperfections (pore, cavity) b width of weld d maximum size of an imperfection (pore, cavity) f projecte
42、d areas of pores or cavities g distance from centerline in T-joint h size of the imperfection (heigth, width) h 1 ; h 2 deviation from the weld penetration l length of imperfection (measured in any direction) L weld length under consideration (weld length examined) L c length of combined porosity (a
43、ffected weld length) s weld penetration s 1 weld penetration in T-joint t workpiece thicknessENISO13919-1:1996 BSI 11-1998 5 Table 2 Imperfections No Imperfection, designation ISO 6520 reference Remarks Limits for imperfections for quality levels moderate D intermediate C stringent B 1 Cracks 100 Al
44、l types of cracks except micro cracks (less than 1 mm 2crack area). For crater cracks see No 2. not permitted not permitted not permitted 2 Crater cracks 104 local crater cracks permitted not permitted not permitted 3 Porosity and gas pores 200 The following conditions and limits for imperfections s
45、hall be fulfilled: a) Maximum dimension l(l 1 , l 2or h) for single pore. l or h 0,5 t or 5 mm, whichever is the smaller l or h 0,4 t or 3 mm, whichever is the smaller l or h 0,3 t or 2 mm, whichever is the smaller b) Maximum dimension of the summation of the projected area of the imperfections. f 6
46、% f 2% f 0,7% Projection is in a direction parallel to the surface and perpendicular to the weld axis. It relates to an area t multiplied by weld length, where weld length is the actual length of the weld or 100 mm, whichever is the smaller. 4 Localised (clustered) and linear porosity 2013 The follo
47、wing conditions and limits for imperfections shall be fulfilled: 2014 a) Maximum dimension l(l 1 , l 2or h) for single pore. l or h 0,5 t or 5 mm, whichever is the smaller l or h 0,4 t or 3 mm, whichever is the smaller l or h 0,3 t or 2 mm, whichever is the smaller b) Maximum dimension of the summat
48、ion of the projected area of the imperfections. f 6% f 2% f 0,7% Projection is in a direction parallel to the surface and perpendicular to the weld axis. It relates to an area t multiplied by weld length, where weld length is the actual length of the weld or 100 mm, whichever is the smaller. In addi
49、tion: c) The distances DL between the individual pores in clustered or linear porosity shall be assessed. Any two pores closer than: 0,25 t or 5 mm, whichever is the smaller 0,5 t or 10 mm, whichever is the smaller 0,5 t or 15 mm, whichever is the smaller shall be considered a combined porosity. d) Combined porosity is permitted, provided the affected weld length L cis less than: L c 2t L c t L c t Affected weld length L cfor combined porosity. Use d) acceptance limit.ENISO13919-1:1996
