1、BRITISH STANDARD BS EN ISO 13920:1997 Welding Generaltolerances for welded constructions Dimensions for lengths and angles Shapeand position The European Standard EN ISO 13920:1996 has the status of a British Standard ICS 25.160BS EN ISO 13920:1997 This British Standard, having been prepared under t
2、he direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference WEE/-/1 Draft for comment 94/703588 DC ISBN 0 580 26357 6
3、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 BSI Committees were represented: WEE/1, Definitions and symbols for welding WEE/2, Welding tests WEE/6, Electric
4、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 welding WEE/4
5、5, Welding of stainless steel Amendments issued since publication Amd. No. Date CommentsBS EN ISO 13920:1997 BSI 10-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO 13920 3 List of references Inside back coverBS EN ISO 13920:1997 ii BSI 10
6、-1998 National foreword This British Standard has been prepared by Technical Committee WEE/-/1 and is the English language version of EN ISO 13920:1996 Welding General tolerances for welded constructions Dimensions for lengths and angles Shape and position published by the European Committee for Sta
7、ndardization (CEN). It is identical with ISO 13920:1996 published by the International Organization for Standardization (ISO). EN ISO 13920 was produced as the result of international discussion in which the UK took an active part. It has been assumed in the drafting of this British Standard that th
8、e 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 Standards are responsible for their correct application. Compliance with a British Standard does n
9、ot of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendmen
10、ts incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13920 August 1996 ICS 25.160.00 Descriptors: Welding, welded construction, shape, position (location), dimensions, length, angles (geometry), dimensional t
11、olerances, angular tolerances, tests English version Welding General tolerances for welded constructions Dimensions for lengths and angles Shape and position (ISO 13920:1996) Soudage Tolrances gnrales relatives aux constructions soudes Dimensions des longueurs et angles Formes et positions (ISO 1392
12、0:1996) Schweien Allgemeintoleranzen fr Schweikonstruktionen Lngen- und Winkelmae Form und Lage (ISO 13920:1996) This European Standard was approved by CEN on 1996-06-20. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
13、 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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, Fr
14、ench, 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 same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland,
15、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, 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 Brusse
16、ls 1996 Copyright reserved to CEN members Ref. No. EN ISO 13920:1996 EEN ISO 13920:1996 BSI 10-1998 2 Foreword The text of EN ISO 13920:1996 has been prepared by Technical Committee CEN/TC 121 “Welding”, the secretariat of which is held by DS, in collaboration with Technical Committee ISO/TC 44 “Wel
17、ding and allied processes”. 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 1997, and conflicting national standards shall be withdrawn at the latest by February 1997. According to the CE
18、N/CENELEC Internal Regulations, the national standards organizations 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 a
19、nd the United Kingdom. Content Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 General tolerances 3 4.1 Tolerances for linear dimensions 3 4.2 Tolerances for angular dimensions 4 4.3 Straightness, flatness and parallelism tolerances 5 5 Indications on drawings 5 6 Testing 5 6.1
20、General 5 6.2 Straightness 5 6.3 Flatness 6 6.4 Parallelism 6 7 Non-conformities 6 Figure 1 4 Figure 2 4 Figure 3 4 Figure 4 4 Figure 5 5 Figure 6 Straightness test 5 Figure 7 Flatness test 6 Figure 8 Parallelism test 7 Table 1 Tolerances for linear dimensions 3 Table 2 Tolerances for angular dimens
21、ions 4 Table 3 Straightness, flatness and parallelism tolerances 6EN ISO 13920:1996 BSI 10-1998 3 1 Scope This European Standard specifies general tolerances for linear and angular dimensions and for shape and position of welded structures in four tolerance classes, these being based on customary wo
22、rkshop accuracy. The main criterion for the selection of a particular tolerance class should be the functional requirements which are to be met. The applicable tolerances are always those which are stated in the drawing. Instead of specifying individual tolerances the tolerance classes according to
23、this standard may be used. General tolerances for linear and angular dimensions and for shape and position as specified in this standard apply for weldments, welding assemblies and welded structures etc. Special provisions may be necessary for complex structures. The specifications given in this sta
24、ndard are based on the principle of independency as specified in ISO8015, according to which the dimensional and geometrical tolerances apply independently of each other. Manufacturing documentation in which linear and angular dimensions or indications for shape and position are presented without in
25、dividually indicated tolerances shall be deemed incomplete if there is no, or inadequate, reference to general tolerances. This does not apply to temporary dimensions. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These
26、normative references are cited at the appropriate place 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 amendment or revision. For undated r
27、eferences the last edition of the publication referred to applies. ISO/DIS 463, Geometrical Product Specifications (GPS) Dimensional measuring instruments; Dial gauges Design and metrological requirements. prEN ISO 1101, Technical drawings Geometrical tolerancing Tolerances of form, orientation, loc
28、ation and run-out Generalities, definitions, symbols, indications on drawings. (ISO/DIS 1101:1995) ISO 3599, Vernier callipers reading to 0,1 and0,05mm. ISO 6906, Vernier callipers reading to 0,02 mm. ISO 8015, Technical drawings Fundamental tolerancing principle. 3 Definitions For the purposes of t
29、his standard the definitions of prEN ISO 1101 apply. 4 General tolerances 4.1 Tolerances for linear dimensions See Table 1. Table 1 Tolerances for linear dimensions Range of nominal sizes l in mm Tolerance class 2 to30 Over 30 up to 120 Over 120 upto 400 Over 400 up to 1000 Over 1000 up to 2000 Over
30、 2000 upto 4000 Over 4000 upto 8000 Over 8000 upto 12000 Over 12000 upto 16000 Over 16000 upto 20000 Over 2000 0 Tolerances t in mm A 1 1 1 2 3 4 5 6 7 8 9 B 2 2 3 4 6 8 10 12 14 16 C 3 4 6 8 11 14 18 21 24 27 D 4 7 9 12 16 21 27 32 36 40EN ISO 13920:1996 4 BSI 10-1998 4.2 Tolerances for angular dim
31、ensions The length of the shorter angle leg shall be used to determine in accordance with Table 2 which tolerances are to apply. The length of the leg may also be assumed to extend to a specified reference point. In this case, the reference point concerned shall be indicated on the drawing. See Tabl
32、e 2 for the relevant tolerances. Figure 1 to Figure 5 show examples of how the shorter angle leg, l, is represented. Table 2 Tolerances for angular dimensions Tolerance class Range of nominal sizes l in mm (length or shorter leg) Up to 400 Over 400 up to 1000 Over 1000 Tolerances D Da a (in degrees
33、and minutes) A 20 15 10 B 45 30 20 C 1 45 30 D 130 115 1 Calculated and rounded tolerances t, in mm/m a A 6 4,5 3 B 13 9 6 C 18 13 9 D 26 22 18 a The value indicated in mm/m corresponds to the tangent value of the general tolerance. It is to be multiplied by the length, in m, of the shorter leg. Fig
34、ure 1 Figure 2 Figure 3 Figure 4EN ISO 13920:1996 BSI 10-1998 5 4.3 Straightness, flatness and parallelism tolerances The straightness, flatness and parallelism tolerances as specified in the following Table 3 apply both for the overall dimensions of a weldment, a welding assembly, or a welded struc
35、ture, and also for sections for which the dimensions are indicated. Other tolerances of form and position, e.g. coaxiality and symmetry tolerances, have not been specified. If such tolerances are required for reasons of function, they shall be indicated on the drawings as specified in prEN ISO 1101.
36、 5 Indications on drawings The designation of the selected tolerance class as specified in Table 1 and Table 2 (e.g. EN ISO 13920-B) or its combination with a tolerance class as specified in Table 3 (e.g. EN ISO 13920-BE), shall be entered in the appropriate area on the drawing. 6 Testing 6.1 Genera
37、l Testing and measuring devices used shall be suitable and accurate for their intended purpose. graduated steel straightedges; tape measures; straightedges; squares; vernier callipers (in accordance with ISO 1599 and ISO 6906); dial gauges (in accordance with ISO/DIS 463). Other testing and measurin
38、g devices may be used by agreement. The results of measurement may be influenced if they are obtained under unusual temperature or atmospheric conditions, e.g. large constructions in strong sun-light. The actual size of an angle shall be determined by applying suitable measuring devices tangentially
39、 to the weldment, but away from the zone immediately influenced by the weld. The deviation shall be derived from the difference between the nominal size and the actual size. The angular deviation may be measured in degrees and minutes, or in millimetres. 6.2 Straightness The edge of the weldment and
40、 the straightedge shall be aligned in such a way that the greatest distance between the straightedge and the actual surface is at its minimum. The distance between the edge and the straightedge shall be measured (example seeFigure 6). Figure 5 Figure 6 Straightness testEN ISO 13920:1996 6 BSI 10-199
41、8 Table 3 Straightness, flatness and parallelism tolerances 6.3 Flatness The actual surface of the weldment and the measuring plane shall be aligned to each other in such a way that the greatest distance between the measuring plane and the actual surface is at its minimum. This may be effected, for
42、example, with the aid of optical devices, tubular water levels, span wires, floor plates, surface plates, and machine beds. The distances between the actual surface and the measuring plane shall be measured (example see Figure 7). 6.4 Parallelism The reference surface shall be aligned parallel to th
43、e reference plane. A measuring plane shall be established parallel to the reference plane and apart from the weldment, using the measuring devices referred to in 6.3. The distances between the actual surface and the measuring plane shall be measured (example see Figure 8). 7 Non-conformities A decis
44、ion on the acceptance of components not complying with this standard may be made on the basis of the suitability for their intended purpose. Range of nominal sizes l in mm (relates to longer side of the surface) Tolerance class Over 30 up to 120 Over 120 up to 400 Over 400 upto 1000 Over 1000 upto 2
45、000 Over 2000 up to 4000 Over 4000 upto 8000 Over 8000 upto 12000 Over 12000 up to 16000 Over 16000 upto 20000 Over 20000 Tolerances t in mm E 0,5 1 1,5 2 3 4 5 6 7 8 F 1 1,5 3 4,5 6 8 10 12 14 16 G 1,5 3 5,5 9 11 16 20 22 25 25 H 2,5 5 9 14 18 26 32 36 40 40 Figure 7 Flatness testEN ISO 13920:1996
46、BSI 10-1998 7 Figure 8 Parallelism test8 blankBS EN ISO 13920:1997 BSI 10-1998 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
47、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the internation
48、al level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We woul
49、d be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standa
