Five different welding methods for the ferritic-austenitic steel 22Cr6Ni3MoN have been evaluated on mill welded heavy wall pipes. The corrosion resistance of the weld joints has been tested both in standard tests and in special environments, related to certain oil & gas wells.

The tests were conclusive in that a welding procedure with addition of sufficient amount of filler metal should be employed. TIG welds without or with marginal filler addition showed poor resistance to pitting and in boiling nitric acid.

Contents of main alloying elements in ferrite and austenite phases have been measured and causes of corrosion attack in welds are discussed.

With minor modifications, NACE-test for Sulphide Stress Cracking was used for evaluation of mill produced welds. The threshold stress value of the weld metals was about 100% of minimum yield strength of the base material.

Subject
Weld attack, Test methods, Materials, Piping, Corrosion rate, Welding, Plasma, Heat, Pitting, Corrosion resistance, Ferrite, Weld metal, Austenite
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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