The paper considers best practice to realise the optimum combination of strength, toughness, corrosion resistance and radiographic integrity in UNS S32760 pipe girth welds made using the GTAW process.

Aspects of fit up, tacking, root gap are considered. The effect of weld heat input and heat input control through the thickness of the joint, welding technique, inter pass temperature control and the use of different combinations of shielding and backing gasses on corrosion resistance of joints is presented. Current specification, procedure and welder qualification requirements are discussed, as is the need for supplementary testing, in particular quantitative microstructural evaluation.

Subject
Materials, Piping, Precipitation (solids), Microstructure, Welding, Argon, Joints, Nitrogen, Shielding, Heat, Corrosion resistance, Toughness, Austenite
Keywords:
super duplex, welding, shielding gas, backing gas, heat input, microstructure, corrosion resistance, weld procedure qualification, welding guidelines
© 2019 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2019
Association for Materials Protection and Performance (AMPP)
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