Abstract
A multi-coil electromagnetic induction type detector had been applied for in-field measurement of the depth of the carburized layer in ethylene furnace tubes. Laboratory tests showed that under conditions where the entire tube wall may be carburized, the technique can give erroneous indications. To identify the complex interaction of the inner and the external magnetic layers, a variable frequency metal sorting instrument was included in the field inspection procedures. Furthermore, dimension and thickness measurements, visual inspection and surface replica techneques also support this improvement of the field inspection method.
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.
