1、DEUTSCHE NORM SeDtember 1996 Electron and laser beam welded joints Guidance on quality levels for imperfections English version of DIN EN IS0 13919-1 Steel (IS0 13919-1 :1996) DIN - EN IS0 13919-1 This standard incorporates the English version of I so 1 39 1 9- 1 . ICs 25.1 60.40 Descriptors: Weldin
2、g, welded joints, quality levels. Schweien - Elektronen- und Laserstrahl-Schweiverbindungen - Leitfaden fr Bewertungsgruppen fr Unregelmigkeiten - Teil 1: Stahl (IS0 13919-1 :1996) Supersedes DIN 8563-1 1, March 1992 edition. European Standard EN IS0 13919-1 : 1996 has the status of a DIN Standard.
3、A comma is used as the decimal marker. National foreword This standard has been published in accordance with a decision taken by CENTTC 121 to adopt, without alteration, International Standard IS0 13919-1 as a European Standard. The responsible German body involved in its preparation was the Normena
4、usschu Schweitechnik (Welding Standards Committee), Technical Committee Strahlschweien. Amendments DIN 8563-11, March 1992 edition, has been superseded by the specifications of EN IS0 13919-1, which is identical to IS0 1391 9-1. Previous editions DIN 8563-1 1 : 1987-1 O. 1992-03 EN comprises 12 page
5、s. 0 No pari of this standard may be reproduced without the prior permission of DIN Deutsches Institut fr Normung e.V., Berlin. Beuth Verlag GrnbH, Berlin, has theexclusive right of sale for German StandardsfDIN-Normen) Ref. No. DIN EN IS0 13919-1: 1996-09 Price group O9 Sales No. 1109 06.97 EUROPEA
6、N STAN DAR D NORME EUROPENNE EUROPISCHE NORM EN IS0 13919-1 August 1996 ICs 23.1 60.40 Descriptors: Welding, welded joints, quality levels. English version Welding Guidance on quality levels for imperfections Part 1 : Steel Electron and laser beam welded joints (IS0 13919-1 :1996) Soudage - Assembla
7、ges souds par faisceau dlectrons et par faisceau laser - Guide des niveaux de qualit des dfauts - Partie 1 : Acier (IS0 1391 9-1 : 1996) Schweien - Elektronen- und Laserstrahl- Schweiverbindungen - Leitfaden fr Bewertungsgruppen fr Unregelmig- keiten - Teil 1: Stahl (IS0 13919-1 :1996) This European
8、 Standard was approved by CEN on 1996-07-1 O CEN members are bound to comply with the CENKENELEC 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 bibiiographical references concerning
9、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 member into its own langua
10、ge 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, Por- tugal, Spain, Sweden, Switzerland and
11、United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-IO50 Brussels O 1996. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No
12、. EN 13919-1 : 1996 E Page 2 EN IS0 13919-1 1996 D C B Contents Page Foreword . 2 Introduction . 2 1 Scope 4 2 Normative references . 4 3 Symbols 4 4 Evaluation of welds 4 Annex A (informative) Additional information for use of this standard . 12 Moderate Intermediate Stringent Foreword Internationa
13、l Standard IS0 13919-1 :1996 Welding - Electron and laser-beam welded joints - Guidance on quality levels for imperfections - Steel, which was prepared by ISO/TC 44 ?Welding and allied processes? of the International Organization for Standardization, has been adopted by Technical Committee CENiTC 12
14、1 ?Welding? as a European Standard. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by February 1997 at the latest. In accordance with the CENKENELEC Internal Regulati
15、ons, 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. Endorsement notice The text of the Internat
16、ional Standard IS0 13919-1 :1996 was approved by CEN as a European Standard without any modi- fication. Introduction This European standard should be used as a reference in the drafting of application codes andlor for other application standards. It may be used within a total quality system for the
17、production of Satisfactory 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 manufact
18、urer, user and/or other parties concerned. The level shall be prescribed 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 standard are intended to provide basic reference dat
19、a and are not specifically related to any particular application. They refer to welded joints and not 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 liste
20、d in table 1. Table 1 : Quaty levels for weld imperfections I Level svmbol I Qualitv level I Page 3 EN IS0 13919-1 11996 The three quality levels are arbitrarily identified as D, C and B and are intended to cover the majority of practical applications. If higher requirements are made on welds than c
21、ompatible 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 the dimensional limits for imperfections could all be covered by specifying one qualit
22、y 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 imperfections in the same welded joint or to include additional requirements. The choic
23、e of quality level for any application should take account of design considerations, subsequent processing, e.g. surfacing, mode of stressing bg. static, dynamic), service conditions (e.g. temperature, environment), and consequences of failure. Economic factors are also important and should include
24、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 applicable to the process and application in question need to be considered, Imperfections
25、 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
26、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 appreciated that methods of non-destructive examination may not be able to give the det
27、ection, 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 electron and laser beam welding. It should be noted that the permitted size for all types
28、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 and may require special precautions, such as weld bead dressing in order to comply with t
29、he 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. Page 4 EN IS0 13919-1 11996 1 SCOQO This standard gives guidance on levels of imperfections in
30、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 manufactured. This standard applies to electron and laser be
31、am 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. When significant deviations from the joint geometries and dimensions stated in this standard are pres
32、ent 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 standard. 2 Normative references This European Standard incorporates by dated or undated reference, provisions fro
33、m other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendme
34、nt or revision. For undated references the latest edition of the publication referred to applies. EN 2581.1 Arc welded joints in steel - Guidance on quality levels for imperfections (Is0 581 7: 1992) EN 26520; Classification of imperfections in metallic fusion welds, with explanations (Is0 6520: 198
35、2) 3 Symbols The following symbols are used in table 2: distance between two imperfections (pore, cavity) width of weld maximum size of an imperfection (pore, cavity) projected areas of pores or cavities distance from centerline in T-joint size of the imperfection (heigth, width) deviation from the
36、weld penetration length of imperfection (measured in any direction1 weld length-under consideration (weld length examined) length of combined porosity (affected weld length) weld penetration weld penetration in T-joint workpieca thickness 4 Evaluation of welds Limits for imperfections are given in t
37、able 2. A welded joint should normally be evaluated separately for each individual type of imperfection. Different types of imperfection occurring at any cross-section of the joint may need special consideration. Page 5 EN IS0 13919-1 11996 M o r L 5 O z d- O F In Y o 8 -al VI om5 c In L o .- Li O N
38、 m u) .- L L Q, .- E 8 u- In W .- - U C GI Page 6 EN IS0 13919-1 11996 64- B- In Y .- E a t- O z I d I Page 7 EN IS0 13919-1 : 1996 b. +- i r Ja U m 3a E v) : m a W O z O0 f“ U a Y .- E 3 n w O C 5 C O 3 O Y o J .- m u- - m h VI 1 al L al ;t U C m W w m 0 :o - - n ;r- Page 12 EN IS0 13919-1 11996 An
39、nex A (informative) Additional infurmation for use of this standard Different parts are very often produced for different applications but to similar requirements. The same requirements should, however, apply to identical parts produced in different workshops to ensure that work is carried out using
40、 the same criteria. The consistent application of this standard in one of the fundamental cornerstones of a quality assurance system for use in the production of welded structures. There is a theoretical possibility of superimposed individual imperfections. In such a case the total summation of ali permitted deviations should be restricted by the stipulated values for the different quality levels. However, the value of a single imperfection may exceed 1 h, e.g. for a single pore. This standard may be used in conjunction with standards for acceptance levels for non-destructive examinations.
