ISO INTERNATIONAL STANDARD 11970 Second edition 2016-03-01 Specification and qualification of welding procedures for production welding of steel castings Descriptif et qualification de modes operatoires de soudage pour le soudage de production des aciers moulés Reference number ISO 11970:2016(E) ISO International Organization for Standardization @ IS0 2016 ZHEJIANG INSTOFSTANDARDIZATION C15956617 vided by IHS under Not for Resale, 2016/4/26 02:56:51 ed without license from IHS IS0 11970:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland All rights reserved. Unless otherwise specified, 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ ,6 - All rights reserved Not for Resale, 2016/4/26 02:56:51 etworking permitted without license from IHS IS0 11970:2016(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 Preliminary welding procedure specification (pWPS) 5 Welding procedure qualification. ..2 6 Test piece. ..2 6.1 General .2 6.2 Shape and dimensions of test piece .2 6.3 Welding of sample. .3 Examination and testing. .5 7.1 Extent of testing .5 7.2 Location and cutting of test specimens 5 7.3 Non-destructive testing. .5 7.4 Destructive test. 7 7.4.1 Transverse (to weld groove) tensile test. .7 7.4.2 Macro-examination. 7 7.4.3 Micro-examination .7 7.4.4 Impacttest 7 7.4.5 Hardness test .7 7.5 Qualification and retesting .8 7.6 Welder qualification. .8 8 Range of qualification .8 8.1 General ..8 8.2 Related to the manufacturer .8 8.3 Related to the material ..9 8.3.1 Parent metal Grouping system for cast steel grades .9 8.3.2 Parent metal thickness (range of qualification) 10 8.4 Common to all welding procedures. .10 8.4.1 Welding process .10 8.4.2 Welding positions. ..10 8.4.3 Type of joint ..10 8.4.4 Fillermetal .10 8.4.5 Type of current. .10 8.4.6 Heat input.. .10 8.4.7 Preheat temperature ..11 8.4.8 Interpass temperature .11 8.4.9 Post-weld heat treatment. .11 8.5 Specific to process 11 8.5.1 Processes 111 [manual metal arc welding (metal arc welding with covered electrode); shielded metal arc welding) and 114 (self-shielded tubular-cored arc welding)... ..11 8.5.2 Process 121 (submerged arc welding with one wire electrode) ..11 8.5.3 Processes 131 (metal-arc inert gas welding; MIG welding; gas metal arc welding), 135 (metal active gas welding; MAG welding; gas metal arc welding), 136 (tubular cored metal arc welding with active gas shield; flux cored arc welding) and 138 (MAG welding with metal cored electrode) ...11 8.5.4 Process 141 (Tungsten inert gas welding; TIG welding; gas tungsten arc welding) ..1 9 Welding procedure qualification record (WPQR) ..11 iii Censee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under license with ISC Notfor Resale,2016/4/2602:56:51 ed without license from IHS