1、STD-AECMA PREN 387b-ENGL 1777 10123LL 0033685 135 asP AECMA STANDARD NORME AECMA AECMA NORM prEN 3876 Edition P 1 October 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Descriptors: EN
2、GLISH VERSION Aerospace series Test method for metallic materials Braze alloys Fusion test Srie arospatiale Luft- und Raumfahrt Mthode dessai pour matriaux mtalliques Prfverfahren fr metallische Werkstoffe Mtaux dapport de brasage Hartlote Essai de fusion Aufschmelzversuch This “Aerospace Series“ Pr
3、estandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee follo wing comment by the Member count
4、ries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and
5、 formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MO
6、ULINEAUX CEDEX I Comments should be sent within six months after the date of publication to I I Edition approved for publication 1997-1 0-31 AECMA Gulledelle 94 B-1200 BRUXELLES I C5 Chairman Mr Odorico aecma 1997 STD-AECMA PREN 387b-ENGL 1997 a LO223LL 013bb 071 Page 2 prEN 3876: 1997 Contents list
7、 O Introduction 1 Scope 2 Normative references 3 Test procedure 4 Acceptance criteria 5 Test report STDSAECMA PREN 387b-ENGL 1797 a LOL23LL C1013b87 TO8 II Page 3 prEN 3876: 1997 O Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The gene
8、ral organization of this series is described in EN 4258. 1 Scope This standard specifies the method to verify, in a fast and qualitative way, the quality level of a braze alloy by examining its appearance after fusion. This test is applicable to braze alloys used for vacuum or partial pressure brazi
9、ng. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or rev
10、isions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 3875 Aerospace series - Metallic materials - Braze alloys - Technical specification 1) EN 42
11、58 Aerospace series - Metallic materials - General organization of standardization - Links between types of EN standards and their use 1) 1) Published as AECMA Prestandard at the date of publication of this standard STD-AECMA PREN 387b-ENGL 1997 m 1012311 00L3b8 994 Page 4 prEN 3876: 1997 3 Test pro
12、cedure 3. I Material A test plate made of heat resisting alloy or austenitic stainless steel with a minimum size of 70 mm x 70 mm x 1 mm, unless otherwise required by the material standard. Braze alloy under test. Stop-off compound. 3.2 The test plate shall be cleaned by appropriate means to remove
13、any residual oxidation and grease from its surface. An annulus of 25 mm k 5 mm inner diameter shall be drawn in the centre of the plate using an appropriate stop-off compound. 1,5 g f 0,5 g braze alloy shall be placed inside the stop-off annulus: powder, paste, pieces of wire, tape or foil according
14、 to the alloy form being tested. When powder is to be tested, this shall be mixed, prior to application, with a suitable binder. The braze alloy shall, before test, be contained in a 15 mm maximum diameter circle. Preparation before test (See figure 1 ) ,- Brazealloy Figure 1 STD-AECMA PREN 387b-ENG
15、L 1997 S 10123LL 00L3bt39 880 5 Page 5 prEN 3876: 1997 3.3 Fusion test The test plate containing the fusion test sample shall be heated in a vacuum furnace at a pressure lower than 10-1 Pa, in accordance with the following cycle, (see figure 2), unless otherwise required by the material standard. 50
16、 “C above liquidus 30 “C below solidus Figure 2 The heating rate from 30 OC below the solidus to a temperature 50 OC above the liquidus shall be at a rate of between 2 OC/min and 5 OC/min. Cooling rate from the temperature 50 OC above the liquidus to 30 OC below the solidus shall be greater than, or equal to, 10 OC/min. 3.4 Inspection Visual inspection shall be carried out at a magnification of x 10 maximum. 4 Acceptance criteria See EN 3875. 5 Test report See EN 3875.
