DD-CEN-TS-14751-2004.pdf
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1、DRAFT FOR DEVELOPMENT DD CEN/TS 14751:2004 Welding Use of time-of-flight diffraction technique (TOFD) for examination of welds ICS 25.160.40 ? Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 03:28:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI DD CEN/TS 14751:200
2、4 This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 24 November 2004 BSI 24 November 2004 ISBN 0 580 44850 9 National foreword This Draft for Development is the official English language version of CEN/TS 14751:2004. This publication is no
3、t to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature because the time-of-flight technique has not been widely used for these applications. It should be applied on this provisional basis, so that information and
4、experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European Standard. A review of this publication will be initiated
5、2 years after its publication by the European organization so that a decision can be taken on its status at the end of its 3-year life. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards. According to the replies received by th
6、e end of the review period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee WEE/46, Non-destructiv
7、e testing, at British Standards House, 389 Chiswick High Road, London W4 4AL, giving the document reference and clause number and proposing, where possible, an appropriate revision of the text. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-r
8、eferences The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of Bri
9、tish Standards Online. Summary of pages This document comprises a front cover, an inside front cover, the CEN/TS title page, pages 2 to 35 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. D
10、ateComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 03:28:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 14751 November 2004 ICS 25.160.40 English version Welding - Use of time
11、-of-flight diffraction technique (TOFD) for examination of welds Soudage - Utilisation de la technique de diffraction des temps de vol (mthode TOFD) pour le contrle des soudures Schweiverbindungen - Anwendung der Beugungslaufzeittechnik (TOFD) fr die Prfung von Schweiverbindungen This Technical Spec
12、ification (CEN/TS) was approved by CEN on 11 July 2004 for provisional application. The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can be convert
13、ed into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS
14、) until the final decision about the possible conversion of the CEN/TS into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
15、, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploit
16、ation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 14751:2004: E Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 03:28:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN/TS 14751:2004 (E) 2 Contents Page Foreword4 1 Sc
17、ope 5 2 Normative references5 3 Terms and definitions .6 4 General remarks on the capabilities of the technique.6 5 Examination levels.7 6 Information required prior to testing.7 6.1 Items to be defined by specification7 6.2 Specific information required by the operator before testing 8 6.3 Written
18、test instruction .8 7 Requirements for personnel and equipment8 7.1 Personnel qualifications .8 7.2 Equipment 8 7.2.1 Ultrasonic equipment and display.8 7.2.2 Ultrasonic probes 9 7.2.3 Scanning mechanisms9 8 Preparation for testing 9 8.1 Volume to be inspected 9 8.2 Set up of probes.9 8.3 Scan incre
19、ment setting .10 8.4 Geometry considerations .10 8.5 Preparation of scanning surfaces11 8.6 Temperature.11 8.7 Couplant .11 8.8 Provision of datum points 11 9 Testing of base material11 10 Range and sensitivity settings.11 10.1 Settings.11 10.1.1 General11 10.1.2 Time window 11 10.1.3 Time-to-depth
20、conversion.12 10.1.4 Sensitivity settings12 10.2 Checking of the settings.12 10.3 Reference blocks.13 10.3.1 General13 10.3.2 Material .13 10.3.3 Dimensions and shape13 10.3.4 Reference reflectors13 11 Weld testing14 12 Interpretation and analysis of TOFD images 14 12.1 General14 12.2 Assessing the
21、quality of the TOFD image.14 12.3 Identification of relevant indications.15 12.4 Classification of relevant indications15 12.4.1 General15 12.4.2 Indications from surface breaking discontinuities 15 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 03:28:24 GMT+00
22、:00 2006, Uncontrolled Copy, (c) BSI CEN/TS 14751:2004 (E) 3 12.4.3 Indications from embedded discontinuities.16 12.4.4 Unclassified indications .16 12.5 Determination of location and size16 12.5.1 Location16 12.5.2 Sizing16 12.6 Evaluation against acceptance criteria.16 13 Test report17 13.1 Genera
23、l .17 13.2 Information relating to object under test17 13.3 Information relating to equipment.17 13.4 Information relating to test technique.17 13.5 Information relating to test results17 Annex A (informative) Reference blocks18 A.1 Thickness requirements.18 A.1.1 Maximum thickness 18 A.1.2 Minimum
24、thickness.18 A.2 Reference reflectors19 A.3 Typical reference blocks.21 Annex B (informative) Examples of typical scans.23 B.1 Satisfactory and unsatisfactory TOFD-images 23 B.2 Typical TOFD-images of discontinuities in fusion welded joints.28 B.3 TOFD-images of geometrical features 32 Bibliography3
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