BS EN ISO23277:2009

ICS 25.160.40

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

BRITISH STANDARD

Non-destructive testingof welds — Penetranttesting of welds —Acceptance levels (ISO23277:2006)

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This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31January 2010

© BSI 2010

ISBN 978 0 580 66700 8

Amendments/corrigenda issued since publication

Date Comments

BS EN ISO 23277:2009

National foreword

This British Standard is the UK implementation of EN ISO 23277:2009. It is identical to ISO 23277:2006. It supersedes BS EN 1289:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN ISO 23277

November 2009

ICS 25.160.40 Supersedes EN 1289:1998

English Version

Non-destructive testing of welds - Penetrant testing of welds - Acceptance levels (ISO 23277:2006)

Contrôle non destructif des assemblages soudés - Contrôle par ressuage des soudures - Niveaux d'acceptation (ISO

23277:2006)

Zerstörungsfreie Prüfung von Schweißverbindungen - Eindringprüfung von Schweißverbindungen -

Zulässigkeitsgrenzen (ISO 23277:2006)

This European Standard was approved by CEN on 24 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A LI S A T I O N EUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

Ref. No. EN ISO 23277:2009: E

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BS EN ISO 23277:2009EN ISO 23277:2009 (E)

3

Foreword

The text of ISO 23277:2006 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 23277:2009 by Technical Committee CEN/TC 121 “Welding” the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2010, and conflicting national standards shall be withdrawn at the latest by May 2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1289:1998.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Endorsement notice

The text of ISO 23277:2006 has been approved by CEN as a EN ISO 23277:2009 without any modification.

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BS EN ISO 23277:2009ISO 23277:2006(E)

© ISO 2006 – All rights reserved iii

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 23277 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 121, Welding (as EN 1289:1998 and its Amd.1:2002 and Amd.2:2003), and was adopted, under a special “fast-track procedure”, by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 5, Testing and inspection of welds, in parallel with its approval by the ISO member bodies.

This document constitutes a consolidated version.

Requests for official interpretations of any aspect of this International Standard should be directed to the Secretariat of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be found at http://www.iso.org.

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BS EN ISO 23277:2009

INTERNATIONAL STANDARD ISO 23277:2006(E)

© ISO 2006 – All rights reserved 1

Non-destructive testing of welds — Penetrant testing of welds — Acceptance levels

1 Scope

This International Standard specifies acceptance levels for indications from surface breaking imperfections in metallic welds detected by penetrant testing.

The acceptance levels are primarily intended for use during manufacture examination, but where appropriate they can 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 3452 and parameters recommended in Annex A. The acceptance levels can be related to welding standards, application standards, specifications or codes. Such a relationship is shown in ISO 17635 for ISO 5817 and ISO 10042.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 3452, Non-destructive testing — Penetrant inspection — General principles

ISO 3452-2, Non-destructive testing — Penetrant testing — Part 2: Testing of penetrant materials

ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections

ISO 10042, Welding — Arc-welded joints in aluminium and its alloys — Quality levels for imperfections

ISO 12706, Non-destructive testing — Terminology — Terms used in penetrant testing

ISO 17635, Non-destructive testing of welds — General rules for fusion welds in metallic materials

ISO/TS 18173, Non-destructive testing — General terms and definitions

EN 1330-2, Non-destructive testing — Terminology — Part 2: Terms common to the non-destructive testing methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/TS 18173, EN 1330-2 and ISO 12706 and the following apply.

3.1 linear indication indication having a length greater than three times its width

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BS EN ISO 23277:2009ISO 23277:2006(E)

2 © ISO 2006 – All rights reserved

3.2 non-linear indication indication having a length less than or equal to three times its width

4 Testing parameters

4.1 General

Many parameters, either individually or in combination, will affect the shape and size of a penetrant indication produced by a weld imperfection.

The following items are significant factors that will affect the shape and size of indications.

4.2 Sensitivity

Penetrant materials are classified in accordance with ISO 3452-2, including a sensitivity level which relates to the ability to detect small imperfections. Generally higher sensitivity materials should be used for the detection of small imperfections.

4.3 Surface condition

Surface condition is directly related to the minimum detectable imperfection size. Best results are normally achieved when inspecting smooth surfaces. Surface roughness or irregularities (e. g. undercut, spatter) can cause high background and non-relevant indications resulting in a low probability of detection for small imperfections.

4.4 Process and technique

Penetrant systems and techniques should be selected according to the test surface condition. In some cases the choice will have a direct effect on the limits of reliable detection, for example the removal of excess penetrant by swab cleaning on rough surfaces is not recommended when seeking small imperfections.

Guidance on these matters is given in Annex A and in ISO 3452.

5 Acceptance levels

5.1 General

The width of the test surface shall include the weld metal and the adjacent parent metal up to a distance of 10 mm on each side.

Indications produced by penetrant testing do not usually display the same size and shape characteristics as the imperfection causing that indication. For the purposes of this standard, it is the size of the indication which should be assessed against the values shown in Table 1.

Acceptance levels prescribed for linear indications are those corresponding to the evaluation level. Indications lower than this shall not be taken into account. Normally, acceptable indications shall not be recorded.

Local grinding may be used to improve the classification of all or part of a test surface when it is required to work to a higher detection limit than that recommended by the existing weld surface condition in Table A.1.

Acceptance levels for welds in metallic materials are given in Table 1.

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BS EN ISO 23277:2009ISO 23277:2006(E)

© ISO 2006 – All rights reserved 3

Table 1 — Acceptance levels for indications Dimensions in millimetres

Acceptance level a Type of indication

1 2 3

Linear indication l = length of indication

l u 2 l u 4 l u 8

Non-linear indication d = major axis dimension

d u 4 d u 6 d u 8

a Acceptance levels 2 and 3 may be specified with a suffix "X" which denotes that all linear indications detected shall be evaluated to level 1. However the probability of detection of indications smaller than those denoted by the original acceptance level can be low.

5.2 Evaluation of indications

Initial evaluation shall be carried out as described in ISO 3452 and final evaluation of indication size shall be carried out after a designated minimum development time has elapsed, and before the indication has degenerated such that it no longer represents the causing imperfection.

5.3 Grouped indications

Any adjacent indications separated by less than the major dimension of the smaller shall be assessed as a single, continuous indication.

Grouped indications shall be evaluated in accordance with an application standard.

5.4 Removal of imperfections

Where the product specification permits, local grinding may be used to reduce or remove imperfections which are the cause of unacceptable indications. All such areas shall be re-tested and evaluated with the same penetrant system and technique.

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BS EN ISO 23277:2009ISO 23277:2006(E)

4 © ISO 2006 – All rights reserved

Annex A (informative)

Recommended testing parameters

The recommended parameters for reliable detection of small imperfections are given in Table A.1.

Table A.1 — Recommended testing parameters

Acceptance level Surface condition Type of penetrant system

1 Fine surface a Fluorescent penetrant system, normal sensitivity or higher to ISO 3452-2. Colour

contrast penetrant, high sensitivity to ISO 3452-2

2 Smooth surface b Any

3 General surface c Any

a The weld cap and parent material offer smooth clean surfaces with negligible undercut, rippling and spatter. The surface finish is typical of welds made by automatic TIG-welding, submerged arc welding (fully mechanized) and manual metal arc welding process using iron powder electrodes.

b The weld cap and parent material offer reasonably smooth surfaces with minimal undercut, rippling and spatter. 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.

c The weld cap and parent material are in the as-welded condition. The surface finish is typical of welds produced by the manual metal arc and MAG welding processes in any position.

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BS EN ISO23277:2009

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