ISO INTERNATIONAL STANDARD 3690 Fourth edition 2018-07 Welding and allied processes : Determination of hydrogen content in arc weld metal Soudage ettechniques connexes-Determination dela teneur en hydrogene dans lemétal fondu pour le soudage a I'arc Reference number IS0 3690:2018(E) iiw @IS0 2018 IS0 3690:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 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:+4122749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS0 3690:2018(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references 3 Terms and definitions 4 Principle 5 Test procedures .2 5.1 Production of weld specimens .2 5.1.1 .2 Summary 5.1.2 Welding fixture. 2 5.1.3 Test piece assemblies .3 5.1.4 Welding and test piece storage 4 5.1.5 Recording of data. .5 5.2 Welding procedures for the production of weld specimens .5 5.2.1 .5 Summary 5.2.2 Manual metal arc welding .6 5.2.3 Submerged arc welding. .7 5.2.4 Tubular cored electrodewith or without gas shield and wireelectrode with gas shield .10 5.3 Measurementofhydrogen inthetestweld. .12 5.3.1 .12 General. 5.3.2 Displacement of mercury method .12 5.3.3 Thermal conductivitydetector method .14 5.3.4 Calibration .16 5.3.5 Linearity. .17 5.3.6 Calculationand expression of results .17 5.3.7 Reporting of results .18 5.4 Measurement of total hydrogen content in the weld metal -Rapid methods ..18 5.5 Rounding procedure.. ..18 Annex A (informative) Recommendations and restrictions in regard to older methods of measurement using mercury .20 Annex B (informative) Recommendations and restrictions in regard to older methods of measurement using glycerine .21 Annex C (informative) Accuracy and reproducibility .22 Bibliography .23 IS0 2018-All rights reserved ili