1、CEN ENU20Dpi-L 93 3404589 0047396 2bT a“ EUROPEAN STANDARD NORME EUROPENNE 0 EUROPISCHE NORM EN 2004-1 July 1993 European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B- 1050 Brussels O CEN 1993 Copyright reserve
2、d to CEN members 0 Ref. No. EN 2004-1 : 1993 E UDC 669.715.018.26-4: 620.1: 537.31: 629.7 Key words: Aircraft industry, aluminium products, aluminium alloys, rolled products, tests, determination, resistivity English version Aerospace series Test methods for aluminium and aluminium alloy products Pa
3、rt 1. Determination of electrical conductivity of wrought aluminium alloys Srie arospatiale Luft- und Raumfahrt Mthodes dessais applicables aux produits en aluminium et alliages d aluminium Partie 1. Dtermination de la conductivit lectrique des alliages daluminium corroys Prfverfahren fr Erzeugnisse
4、 aus Aluminium und Aluminiumlegierungen Eil 1. Bestimmung der elektrischen Leitfhigkeit von Aluminium-Knetlegierungen This European Standard was approved by CEN on 1993-07-23. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this Euro
5、pean 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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English
6、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finl
7、and, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN Page 2 EN 2004-1 : 1993 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiri
8、es and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This standard was submitted for Formal Vote, and
9、the result was positive. 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 January 1994, and conflicting national standards shail be withdrawn at the latest by January 1994. According to the CENKENE
10、LEC Internal Regulations, the foliowing countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finiand, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom Contents Page 1 Scope 2 Purpose
11、 of the test 3 Normative references 4 5 Unit of conductivity 6 Principle 7 Limitations 8 Apparatus 9 10 Procedure 11 lst report Definitions and use of reference blocks Calibration and checks on apparatus 3 3 3 3 4 4 4 5 5 5 a 6 e CEN EN*2004-L 93 3404589 O049398 032 Page 3 EN 2004-1 : 1993 1 Scope T
12、his standard specifies a non destructive test method for the determination of electrical conductivity of wrought aluminium alloy. It is applicable when referenced. 2 Purpose of the test The test is used to determine : - the heat treatment condition of products ; - the heat treatment uniformity of ba
13、tches ; - the heat treatment condition in which some alloys show the lowest susceptibility to stress corrosion - the uniformity of cladding thickness. attack ; 3 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normativ
14、e references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated referenc
15、es the latest edition of the publication referred to applies. EN 2004-7 Aerospace series - Test methods for aluminium and aluminium alloy products - Part 7 - Calibration of electrical conductivity instrumentation 1 I 4 Definitions and use of reference blocks 4.1 Master reference blocks Blocks of sen
16、sibly uniform electrical conductivity the values of which have been determined and calibrated in a standardised bridge, They shall be used solely to calibrate and to act as standardsfor the preparation of other reference blocks. If such blocks are not yet available, other blocks shall be used by agr
17、eement between the purchaser and the manufacturer. 4.2 Secondary reference blocks Blocks of sensibly uniform electrical conductivity calibrated either against a standardised bridge or against master reference blocks such that they may be used for the calibration of operating reference blocks They sh
18、all be used by material manufacturers and users for the calibration of apparatus for electrical conductivity measurement to the requirements of this standard. 1) In preparation at the date of publication of this standard Page 4 EN 2004-1 : 1993 % IACS 25,9 MS/m 15 4.3 Operating reference blocks 27.6
19、 29.3 31 ,O 32.8 34.5 36.2 37,9 16 17 18 19 20 21 22 Blocks necessary for operation and calibration of apparatus for electrical conducttvity measurement. The operating reference blocks shall be calibrated at the operating frequency against secondary reference b I ocks. % IACS 39.7 41,4 43,l 44.8 46.
20、6 48.3 50.0 51.7 MS/m 23 24 25 26 27 28 29 30 i 5 Unit of conductivity The unit of electrical conductivity is megasiemens per metre (MS/m). Measuring instruments shall be calibrated in this unit. Where the instrument is scaled differently (e.g. % IACS), the instrument manufacturer shall supply to th
21、e purchaser the values for conversion to MS/m (see table 1). Table 1 - Conversion IACS to MS/m 6 Principle A comparator method by means of an instrument which requires to be calibrated against operating reference blocks of known electrical conductivity. 7 Limitations 7.1 Products of less than 1.2 mm
22、 thickness They shall only be tested by agreement between the purchaser and the manufacturer. These parties shall jointly define the corrections and acceptance conditions to be applied during testing and acceptance of these products. 7.2 Coated products They shall not be tested unless the coating is
23、 insulating and less than 0.01 mm thick. . c (EN ENx2004-II 93 3404589 0049400 5LO Page 5 EN 2004-1 : 1993 8 Apparatus 8.1 The choice of frequency lies with the purchaser of the instrument. The frequency of measuring instruments lies normally between 2 kHz and 800 kHz. 8.2 Should a multi-range instr
24、ument be used, each range shall be calibrated. 8.3 shall be calibrated at the operating frequency. Every time when an instrument is to be used for determining uniformity of cladding thickness, it 8.4 accuracy of at least 0.2 MS/m. The reading or measuring instrument shall be so accurate that the ind
25、ication can be read to an 9 9.1 Calibration and checks on apparatus The apparatus shall be calibrated to EN 2004-7 9.2 Before measuring and at adequate intervals of more than 2 h during testing, the apparatus shall be calibrated against the operating reference blocks and any necessary correction fac
26、tor or correction applied. 9.3 Where routine measurement is made over a limited range of conductivity (3,s MS/m max.). the apparatus shall be regularly checked at the high and low limits of this range using the operating reference blocks with the same limits 9.4 reference blocks, it shall be re-cali
27、brated and all parts re-checked. If the measuring instrument shows a greater deviation than = 0.3 MS/m from the operating 10 Procedure 10.1 Temperature The apparatus and operating reference blocks shall be used in conditions of stable temperature and the product to be tested shall be as near as poss
28、ible to this stable temperature All reference blocks used for measurements shall be placed in contact with the product under examination for a period of time sufficient to achieve a uniform temperature and where possible remain in contact during the whole test. CEN EN*2004-L 93 = 3404589 0049401 457
29、 - . Page 6 EN 2004-1 : 1993 1 0.2 Frequency A frequency of 60 kHz is the most widely used. For sheet thickness 1,2 mm sg a 500 mm or a convex radius of curvature 1 O0 mm. Unless otherwise agreed between purchaser and manufacturer, measurements shall be made 10.3.4 For products with surface roughnes
30、s Ra 10 pm : - the operating reference blocks shall have the same roughness as the product, or - the surface area to be tested shall be dressed to Ra G 1 O pm. The measurement shall be carried out on surfaces with roughness Ra G 1 O pm. 10.3.5 Surface cleanliness All surfaces to be tested shall be c
31、lean and free from loose contaminant. 10.3.6 Irregular readings Where local irregular variations in reading are obtained, the presence of small surface flaws may be suspected. The surface may be slightly dressed to remove such flaws. If the irregular readingsare still displayed at this point, they shall be stated in the test report with the remark -after dressing#. 11 Testrepon The test report shall include the following : - reference to this standard; - results of electrical conductivity measurements in MS/m; - measuring positions; - type and reference number of the instrument used.
