1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3718:2012Aerospace series Testmethod for metallic materials Ultrasonic inspection oftubesBS EN 3718:2012 BRITISH STANDARDNational forewordThis British Standard is the UK im
2、plementation of EN 3718:2012. The UK participation in its preparation was entrusted to TechnicalCommittee ACE/61/-/5, Non - Destructive Testing of Metallic Materials for Aerospace Purposes.A list of organizations represented on this committee can be obtained on request to its secretary.This publicat
3、ion does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 76951 1 ICS 49.030.60 Compliance with a British Standard cannot confer immunity
4、 from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate Text affectedBS EN 3718:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3718 April 2012 ICS 49.030.60 Engli
5、sh Version Aerospace series - Test method for metallic materials - Ultrasonic inspection of tubes Srie arospatiale - Mthode dessai applicable aux matriaux mtalliques - Contrle par ultrasons des tubes Luft- und Raumfahrt - Prfverfahren fr metallische Werkstoffe - Ultraschallprfung von Rohren This Eur
6、opean Standard was approved by CEN on 21 January 2011. 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
7、concerning such national standards may be obtained on application to the CEN-CENELEC 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 membe
8、r into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
9、Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Ave
10、nue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3718:2012: EBS EN 3718:2012EN 3718:2012 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Short descr
11、iption of the procedure . 4 5 Equipment requirements 4 6 Preparation for inspection 9 7 Inspection procedure 10 8 Evaluation . 11 9 Written instruction . 12 10 Qualification and approval of personnel . 12 11 Inspection and test report . 12 BS EN 3718:2012EN 3718:2012 (E) 3 Foreword This document (EN
12、 3718:2012) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Serv
13、ices of the member countries of ASD, prior to its presentation to CEN. 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 September 2012, and conflicting national standards shall be withdrawn at the
14、latest by September 2012. 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. According to the CEN/CENELEC Internal Regulations, the natio
15、nal standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
16、Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3718:2012EN 3718:2012 (E) 4 1 Scope This European Standard specifies the requirements for ultrasonic inspection of tubes in metallic materials with an external diameter 5 mm. For o
17、ther cases, the use of this standard is by agreement between the manufacturer and the purchaser. The purpose of the ultrasonic inspection is the detection of defects within the wall thickness and at the outer and inner surfaces of the tube. The method will detect two dimensional defects in the longi
18、tudinal and circumferential directions perpendicular to the tube wall. Where inspection for other types of defects is required, this requirements should be stated on the order. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are in
19、dispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2078, Aerospace series Metallic materials Manufacturing schedule, inspection schedule, inspection and te
20、st report Definition, general principles, preparation and approval EN 4050-1, Aerospace series Test method for metallic materials Ultrasonic inspection of bars, plates, forging stock and forgings Part 1: General requirements 1)EN 4179, Aerospace series Qualification and approval of personnel for non
21、-destructive testing ISO 7963, Non-destructive testing Ultrasonic testing Specification for calibration block No. 2 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 4050-1 apply. 4 Short description of the procedure The inspection shall be carried out
22、using ultrasonic test equipment, which emits ultrasonic signals passing through a liquid coupling medium obliquely into the tube under test and which receives and evaluates the reflected (or transmitted) signals. The tubes shall be inspected automatically and completely i.e. the relative movement of
23、 probe and tube under test shall be accomplished with the aid of a manipulator. The corresponding signal amplitudes from the ultrasonic test equipment shall be plotted as a function of the location, e.g. amplitude scans or C-scans. 5 Equipment requirements 5.1 Calibration blocks Calibration blocks a
24、s per ISO 7963 or equivalent standards shall be used to check the proper function and characteristics of the ultrasonic test unit and probes. The method of checking the equipment and requirements concerning the calibration blocks shall be agreed between the manufacturer and the purchaser. 1) Publish
25、ed as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). BS EN 3718:2012EN 3718:2012 (E) 5 5.2 Reference specimens A reference specimen shall be fabricated from a tube consisting of the same material, having the same nominal diameter, wall thickness, surface conditi
26、on and heat treatment condition as the tubes to be inspected. The selected length of the reference specimen shall be such that it can be tested in the test system described below. The reference specimen shall not have any defects or other irregularities that can produce indications or interfere with
27、 the detection of the reference notches. Four reference notches of the same dimensions (depth, width, length) as shown in Figure 1 shall be introduced in each tube. The depth, width and length of the notches are defined in Table 1 and subdivided into classes. A-A B.B C-C D-D Longitudinal defects Lon
28、gitudinal defects Circumferential defects Circumferential defects 2a212dR t RR =+= 2i212dr t rr =+= t = Depth b = Widht L = Length di= Internal diameter da= External diameter P 20 mm Figure 1 Reference specimen with four notches in longitudinal and circumferential direction on the inner and outer su
29、rface of the tube wall BS EN 3718:2012EN 3718:2012 (E) 6 Table 1 Reference notch dimensions Dimensions in millimetres Class Depth Length Width 5 0,05 1,5 0,104 0,05 3,0 0,10 3 0,08 3,0 0,102 0,10 3,0 0,10 1 5 % of a a 6,0 0,10aa is wall thickness in millimetres. The reference notches shall be rectan
30、gular for notches in the longitudinal direction and shall have the shape of a ring segment in the circumferential direction and edge radii 0,13 mm. The depth of the notch shall correspond to a mean value, measured from the tube surface to the respective penetration depth of the notch. Notch dimensio
31、ns shall comply with the values specified in Table 1 to within 15 %. The notch depth shall be measured from the circular surface to the deepest penetration of the notch. Measurements may be made by replication or by a destructive method on a duplicate notch which has identical ultrasonic response (a
32、mplitude within 90 % to 110 % of the reference notch amplitude). In order to have access to notches lying inside the reference specimen, a window may be cut into the opposite tube wall to provide access to the notch. The window shall not be so large as to interfere with the ultrasonic responses from
33、 the notch. Each reference specimen shall be identified. The serial number and EN 3718 shall be permanently marked on the reference specimen and the following information shall either be marked on the specimen or maintained in a log book: alloy, heat treatment condition, diameter, wall thickness, si
34、ze and location of reference notches. 5.3 Ultrasonic test equipment The ultrasonic test equipment shall be of the pulse echo type with appropriate signal outputs for registration of the measuring values. 5.4 Probes and probe arrangement In view of the geometry of the defects anticipated, the use of
35、spherical or cylindrical focused probes as determined by the specified notch dimensions is recommended. For the ultrasonic echo inspection to detect defects running primarily in the longitudinal or circumferential direction of the tube, identical probes shall be used to achieve oblique incidence on
36、both sides of the tube. The probes shall be sufficiently far apart to ensure that they will not influence one another. It is also possible to use just one probe on one side, although it is then necessary to inspect from the other side in a subsequent run. For example, the inspection of steel tube ma
37、y be carried out by using 45 transverse waves. In this case the angle of incidence in water is approximatively 17 for detection of defects in longitudinal tube direction (see Figure 2), and approximatively 19 for detection of defects in circumferential tube direction (see Figure 3). BS EN 3718:2012E
38、N 3718:2012 (E) 7 Key 1 Probe 1 2 Probe 2 Figure 2 Oblique incidence on both sides to detect defects in longitudinal direction of the tube = 17 Key 1 Probe 1 2 Probe 2 Figure 3 Oblique incidence on both sides to detect defects in circumferential direction of the tube = 19 BS EN 3718:2012EN 3718:2012
39、 (E) 8 5.5 Coupling A liquid couplant such as water, oil or glycerine shall be used for conduction of the ultrasonic longitudinal waves between the probes and the tube wall. Wetting or anti-corrosion agents may be added to the couplant, provided that the surface conditions of the tube is not impaire
40、d. Bubbles are not allowed in order to avoid any disturbance of the transmission of sound. Sound coupling may be achieved by immersion of the probe and tube. Coupling is also possible by having a local stream of fluid between the two, whilst ensuring that the flow is not turbulent (squirter techniqu
41、e). 5.6 Manipulator Using a manipulator, the helix and rotational speed shall be such that two return signals are recorded from the reference notch. The two signals shall not be more than 6 dB lower than the maximum indication of the reference notch. See Figure 4. Figure 4 Test trace in the case of
42、helical movement 5.7 Evaluation and recording unit The ultrasonic signals of interest received by the ultrasonic apparatus, shall be gated out and their amplitudes registered by a recorder plotting them as a function of the respective location on the tube. Evaluation and recording is also possible b
43、y using a computer and a plotter for producing amplitude scans or C-scans. 5.8 Detection sensitivity of the equipment The inspection equipment and the procedure for the respective type of defect primarily to be found (see description of reference specimen in 5.2) shall fulfil the following requireme
44、nts with regard to detection sensitivity: indication of the corresponding notch of the reference specimen for the respective tube type with a signal-to-noise ratio of at least 12 dB (with reference to faultless condition). In the case of external defects, indications shall be based on a one-skip-dis
45、tance arrangement; complete separation time-wise of the evaluation signal from any other signal (e.g. surface signal); demonstration of reproducibility by means of plots. BS EN 3718:2012EN 3718:2012 (E) 9 One procedure is normally required for each main type of defect, however the following simplifi
46、cations are possible: if the signal indications of the reference notches in longitudinal (or circumferential) tube direction fulfil the above-mentioned criteria on the inside and outside and do not differ by more than 10 %, the tubes may be simultaneously inspected for internal and external defects
47、in longitudinal (and circumferential) direction of the tube. In this case, the entire time range of the signal from the inner and outer notch shall be gated in one or two channels (see Figure 5) and evaluated on the basis of the one channel threshold level. Key 1 Time 2 One channel 3 Channel 1 4 Cha
48、nnel 2 Figure 5 Gating of signals Si(inner notch) and Sa(outer notch) 6 Preparation for inspection 6.1 Check of tubing surface The inner and outer surfaces of the tubes shall be clean and free from damage, dirt, grease, paint and any other surface contamination which might affect the interpretation
49、of the inspection results. Neither the metal nor its final surface condition shall be impaired by the surface cleaning and pretreatment procedures carried out prior to the ultrasonic inspection. The inner surface shall be dry to avoid false indications from fluid droplets. Tubes shall be plugged. The mean depth of surface roughness Rashall not exceed 2,5 m. 6.2 Instrument calibration Using the reference specimen as per 5.2, the test equipment shall be set to a certain indication value with reference to the res
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