ISO/TR TECHNICAL REPORT 17844 First edition 2004-09-15 Welding Comparison of standardised methods for the avoidance of cold cracks Soudage - Comparaison de méthodes normalisées pour éviter les fissures a froid Reference number ISO/TR 17844:2004(E) Copyright International Organization for Standardization @ISO2004 itted without license from IHS Not for Resale ISO/TR 17844:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland Copyightinteratinal organization for Standardization @ISO2004-All rights reserved nitted without license from IHS Not for Resale ISO/TR 17844:2004(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeen non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In exceptional circumstances, when a technical committee has collected data of a different kind from that simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely informative in nature and does not have to be reviewed until the data it provides are considered to be no longer valid or useful. rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO/TR 17844 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 10, Unification of requirements in the field of metal welding, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). Throughout the text of this document, read "..this CEN Report.." to mean "...this Technical Report..." ii CopyighIntemalinalOrganzaioorsandardizllonghtsreserved ISO/TR 17844:2004(E) Contents Page Foreword... Introduction. ....vii 1 Scope 2 2.1 Cracking test method .. 2.2 Parent metal composition range .. 2.3 2.4 Hydrogen level and welding process 2.4.1 Hydrogen scales ... 2.4.2 Selection of hydrogen scales .. 2.5 2.6 Special considerations 2.6.1 Conditions which might require more stringent procedures... 2.6.2 2.6.3 Simplified conditions for manual metal-arc welding 8 2.7 Determination of preheat ... 10 3 CET-method.. 3.1 Cracking test method 18 3.2 Parent metal composition range. 3.3 Plate thickness... .20 3.4 Hydrogen level and welding process . 21 3.5 .21 3.6 Influence of residual stress ..... 3.7 Determination of preheat ... 22 3.7.1 Calcul