ASD-STAN PREN 3475-514-2012 Aerospace series Cables electrical aircraft use Test methods Part 514 Porosity of copper cladding on aluminium strands (Edition P 2).pdf

1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 3475-514 Edition P 2 June 2012 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: Supersedes Edition P

2、1 of September 2006 and will supersede EN 3475-514:2007Descriptors: ENGLISH VERSION Aerospace series Cables, electrical, aircraft use Test methods Part 514: Porosity of copper cladding on aluminium strands Srie arospatiale Cbles lectriques usage aronautique Mthodes dessais Partie 514 : Porosit dun r

3、evtement cuivre sur des brins aluminium Luft- und Raumfahrt Elektrische Leitungen fr Luftfahrtverwendung Prfverfahren Teil 514: Porositt der Kupferauflage auf Einzeldrhten aus Aluminium This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defe

4、nce Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall

5、 not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Sta

6、ndardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publica

7、tion 30 June 2012 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Domain Copyright 2012 by ASD-STAN prEN 3475-514:2012 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Applicability 3 4 Preparation of specimens .3 5 Method (see note)

8、.4 6 Requirements .4 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication

9、. prEN 3475-514:2012 (E) 3 1 Scope This standard specifies an assessment method of the copper porosity on copper clad aluminium strands with or without external coating or on Nickel or silver copper clad aluminium conductors. It shall be used together with EN 3475-100. 2 Normative references The fol

10、lowing 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. EN 3475-100, Aerospace series Cables, electrical, aircra

11、ft use Test methods Part 100: General ASTM B 298, Standard specification for silver-coated soft or annealed copper wire 1)ASTM B 355, Standard specification for nickel-coated soft or annealed copper wire 1)ASTM B 566-93, Standard specification for copper-clad aluminum wire 1)3 Applicability This tes

12、t method is applicable to any copper-clad aluminium wire or strand, that is to say: applicable to any class of copper-clad aluminium wire (class as defined by ASTM B 566-93). applicable to: a strand during its manufacturing process or before stranding; a complete conductor; a strand taken for a stra

13、nded conductor; a strand taken from a member belonging to a rope-lay conductor. it is applicable to any nickel or silver-coating class (class as defined respectively by ASTM B 298 or ASTM B 355). 4 Preparation of specimens Test specimen shall be of 2,30 m 10 % length and shall not be touched with ba

14、re fingers. The surface of the sample shall be free of oil or other contaminants. If necessary, clean it by wiping the specimen using a clean lint free material and an organic solvent (such as alcohol/ether 50/50). 1) Published by: ASTM National (US) American Society for Testing and Materials http:/

15、www.astm.org/. prEN 3475-514:2012 (E) 4 In order to limit curve stress, wrap it: on a mandrel of 40 mm for strands alone and then remove the mandrel, or around a minimum diameter of about 200 times its strand diameter for a stranded conductor. The ends should be removed from the windings in a length

16、 of about 0,15 m. 5 Method (see note) NOTE This method is coming from works lead separately by the Company FSP-one and above all by Drahtwerk Waidhaus GmbH at the origin of the “equation” bubbles troubles. The 2 m centre part of the specimen shall be immersed in a pure solution of hydrochloric acid

17、which has a density of 1,088 g/cm3at 20 C: For strand: 01060 s; For complete conductor: 015 s. In no circumstances shall the specimen ends be immersed in the solution. During the immersion the specimen shall be examined carefully with the naked eye. If the copper is porous the hydrochloric acid solu

18、tion will come in contact with the aluminium metal and, as consequence of an active reaction, bubbles will appear immediately rising from the specimen surface to the surface of the test solution. The presence of some visible adherent bubbles on the conductor surface might already be caused by a bad handling of the samples or surface contaminant and is not enough evidence that the nickel and copper layers of the sample have been damaged down to the aluminium core. 6 Requirements There shall be no bubbles rising from the specimen surface to the surface of the test solution.