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INTERNATIONAL ISO STANDARD 13920 First edition 1996-08-01 ES Welding — General tolerances for welded constructions — Dimensions for lengths and angles — Shape and position Soudage — Tolérances générales relatives aux constructions soudées — Dimensions des longueurs et angles — Formes et positions Reference number ISO 13920:1996(E) ISO 13920:1996(E) Foreword ISO fthe Intemational Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing intemational Standards is normaly carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has tha right to be represented on that committee. Intemational organizations, governmental and non- govemmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Intemational Electrotechnical Commission (JEC) on all matters of electrotechnical standardization. Draft Intemational Standards adopted by the technical committees are circulated to lhe member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote, Intemational Standard ISO 13920 was prepared by the European Committee for Standardization (CEN) in collaboration with ISO Technical Committee TC 44, Welding and allied processes, Subcommittes SC 10, Unification of requirements in the field of meta! welding, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). e ISO 1996 Al rights reserved. Unloss otherwise specified, no part of this publication may be raproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and mierotilm, without permission in writing from the publisher. Intemational Organization for Standardization Case postale 56 » CH-1211 Genôve 20 « Swilzerland intemet —contralBisocs.iso.ch X400 — c=ch; a-s0Onet; Printed in Switzoriand 0; O=isocs; 5=central ISO 13920:1996(E) eIso 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 “Welding 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 CEN/CENELEC Internal Regutations, 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 and the United Kingdom. SISO 1 Scope This European Standard specifies general tolerances for linear and angular dt- mensions and for shape and position of welded structures in four tolerance clas- ses, these being based on customary workshop accuracy. The main criterion for the selection of a particular tolerance class should be the functional require- ments 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 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 standard are based on the principle of indepen- dency as specified in ISO 8015, according to which the dimensional and geometri- cal tolerances apply independently of each other. Manufacturing documentation in which Jinear and angular dimensions or indica- tions for shape and position are presented without individuaily indicated tole- rances 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 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 references the last edition of the publication referred to applies. IS0/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, location and run-out - Generalities, definitians, symbols, indications on drawings (1so/DIS 1101:1985) ISO 3599 “ Vernier calVipers reading to 0,1 and 0,05 m 150 6906 vernier callipers reading to 0,02 mm Iso 8015 Technical drawings - Fundamental tolerancing principle ISO 13920:1998(E) eIso Table 2: Talerançes for angular dimensions ISO 13920:1998(E) Range of nominal sizes 1 (length or shorter leg) to mm Tolerance Up to 400 Over 400 Dver 1000 class up to 1000 Tolerances ha (in degrees and minutes) A + 20" + 15! + 0! B +45 + 30º + 20º [o +1º +45! +30! E] + 1º30' + 1º15' +1º Calculated and rounded tolerançes t, in mm/m!) A +6 +4,5 *3 8 +13 +9 +6 c + 18 +13 +9 |) t 25 + 22 + 18 2) The value indicated 1n mm/m corresponds to the tangent value of the genera! tolerance. It is to be multiplied by the length, In m, of the shorter leg. Reference point Figure 1 Reference point Figure 2 Reference point Figure 3 ISO 13920:1996(E) Referenca point + Figure 5. Figure 4. 4.3 Straightness, flatness and paralielism tolerances BISO The straightness, flatness and parallelism tolerances as specified in the follo- wing table 3 apply both for the overall dimensions of a weldment, a welding assem- bly, or a welded structure, and also for sections for which the dimensions are indicated. Other tolerances of form and position, e.g. coaxialtty and symmetry tolerances, have not been specified. If such tolerances are required for reasons of func- tion, they shall be indicated on the drawings as specified in prEN 150 1101. Table 3: Straightness, flatness and parallelism tolerances Ranga of nominal sizes 1 1n mm (relates to longer side of tha surfaca) Tolerance Over Over ver Over ver Ovar Over Ovar Over Over class 30 120 40 1000 2000 4000 8000 12000 16000 20000 up up up up up up up up up to to to to ta to ta to to 120 400 1000 2000 4000 sono 12000 16000 20000 Tolerances t in mm E 0,5 1 1,5 2 3 4 5 6 7 8 F ! 1,5 3 45 5 8 10 12 14 16 q 1,5 3 5,5 9 u 16 20 22 25 25 H 2,5 5 9 14 18 26 Er 36 au 40 ISO 13920:1996(E) EO) 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 actua) surface is at íts minimum. This may be effected, for 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). Dad >» Measuring plane mar" Mn St Actual suface Figure 7: Flatness test 6.4 Parallelism The reference surface shall] be aligned parallel to the 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 B). x Measuring plane SD .s A Measuring plane á r Actual suriace hqs min St 5 . . BT ) “ty E] Reference surface Reference plane Figure 8: Paratlelism test 7 Non-conformities A decision on the acceptance of components not complying with this standard may be made on the basis of the suitabllity for their intended purpose. 
