ISO 23278 PDF

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This copy downloaded on by authorized user logan ahlstrom. No further reproduction or distribution is permitted. Unless otherwise specified, 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 on the internet or an intranet, without prior written permission.

The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. In particular the different approval criteria needed for the different types of ISO documents should be noted.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. This second edition cancels and replaces the first edition ISO , which has been technically revised.

Non-destructive testing of welds — Magnetic particle testing — Acceptance levels1 ScopeThis International Standard specifies acceptance levels for indications from imperfections in ferromagnetic steel welds detected by magnetic particle testing. The acceptance levels are primarily intended for use during manufacture examination. NOTE They can also be used for in-service inspection. The acceptance levels in this International Standard are based on detection capabilities that can be expected when using techniques specified in ISO and parameters recommended in Annex A.

The acceptance levels can be related to welding standards, application standards, specifications or codes. Acceptance levels for grouped indications are not covered by this International Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. Detection of small imperfections is highly dependent on the surface condition of the weld and the detection media used.

Examples of the application of these parameters to give a high probability of detection are given in Annex A. ISO E 5 Acceptance levels5. Acceptance levels prescribed for linear indications are those corresponding to the evaluation level. Indications lower than this shall not be taken into account.

Acceptable indications do not have to be recorded. Any adjacent indications separated by less than the major dimension of the smaller shall be assessed as a single, continuous indication. Local grinding may be used to improve the classification of all or just part of a test surface, when it is required to work to a higher detection limit than that expected by the existing weld surface condition.

Acceptance levels are given in Table 1. However, the probability of detection of indications smaller than those denoted by the original acceptance level can be low. All such areas shall be re-tested and evaluated with the same magnetic system and technique. The surfaces are in the as-welded condition. It may be necessary to improve the surface condition, e.

The detection media are given in order of preference. Table A. The surface finish is typical of welds, made by automatic TIG-welding; submerged arc welding fully mechanized and manual metal arc welding with iron powder electrodes. The surface finish is typical of welds made by manual metal arc welding vertical downwards and MAG-welding using argon rich gas for the capping runs. The surface finish is typical of welds made by manual metal arc welding or MAG-welding in any position.

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