ISO INTERNATIONAL STANDARD 2553 Fifth edition 2019-03 Welding and allied processes Symbolic representation on drawings - Welded joints Soudage et techniques connexes -Représentations symboliques sur les dessins-Assemblages soudés Reference number IS02553:2019(E) ISO @ IS0 2019 IS0 2553:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 2553:2019(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Welding symbol .5 4.1 General. .5 4.2 Basic welding symbol ..5 4.3 Welding symbol systems .6 4.4 Elementary symbols. 4.4.1 General. .6 4.4.2 Combinations of elementary symbols .9 4.4.3 Double-sided butt welds .9 4.5 Supplementary symbols .10 4.5.1 General. .10 4.5.2 Weld-all-around symbol .13 4.5.3 Welds of the same type made from point to point. .14 4.5.4 Field welds .15 4.5.5 Root reinforcement - - Butt welds made from one side ..15 4.5.6 Welds on flanged butt and flanged corner joints. .15 4.6 Arrowline .17 4.6.1 General. .17 4.6.2 Multiple arrow lines. ..17 4.6.3 Broken arrow line. .17 4.7 Reference line and weld location .18 4.7.1 Referenceline .18 4.7.2 Weld location .18 4.7.3 Multiple reference lines ..19 4.8 Tail. 20 5 Dimensioning of welds .21 5.1 General 21 5.2 Cross-sectional dimensions 21 5.3 Length dimensions 21 5.3.1 General. .21 5.3.2 Intermittent welds. 21 5.4 Butt welds 22 5.4.1 Penetration depth. .22 5.4.2 Double-sided welds. 22 5.4.3 Flanged butt welds.. 22 5.4.4 Flare bevel and flare-V butt welds 22 5.5 Fillet welds .22 5.5.1 Weld size 22 5.5.2 Deep penetration fillet welds. 22 5.6 Plug welds in circular holes .23 5.7 Plug welds in elongated holes (slots), 23 5.8 Spot welds. .23 5.9 Seam welds 23 5.10 Edge welds. .23 5.11 Stud welds.... 23 5.12 Overlaywelds .23 5.13 Stake welds ..24 6 Dimensioning of joint preparations ..37 IS0 2019 - All rights reserved iii