Failure of the weld joints is one of the major causes affecting the service-ability of pulp and paper equipment. While considerable attention is paid to material selection for a specific service environment, the significance of weld joints in corrosion service in many cases is not sufficiently considered. Metallurgical and corrosion aspects of weld joints are briefly discussed through case histories. The service life of the weld can be affected by composition, microstructure, heat-affected zone, and weld defects. The failure modes include hydrogen embrittlement, fatigue, preferential corrosion, stress-corrosion cracking, and galvanic corrosion. Several case histories of equipment failure traceable to the deficiencies of weld joints are presented. The equipment includes chip digester walls, induced draft fan shafts, waterwall tubes in recovery boilers, steam lines, black liquor pipes, and spent bleach liquor lines. Available corrective procedures are discussed.

Subject
Materials, Piping, Intergranular stress corrosion cracking, Pulp, Tubes, Inspection, Corrosion cracking, Welded joints, Mechanical failure, Stainless steel, Cracks, Stress corrosion cracking, Heat affected zone
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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