1、AECMA STANDARDNORME AECMAAECMA NORMprEN 3875Edition P 2April 2002PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION (AECMA-STAN)Gulledelle 94 B-1200 BRUXELLES Tel. (+32) 2 775 8110 Fax. (+32) 2 775 8111ICS: Supersedes edition P 1January 1996Descriptors:ENGLISH VERSIONAer
2、ospace seriesMetallic materialsFiller metal for brazingTechnical specificationSrie arospatialeMatriaux mtalliquesMtaux dapport de brasageSpcification techniqueLuft- und RaumfahrtMetallische WerkstoffeHartloteTechnische LieferbedingungenThis “Aerospace Series“ Prestandard has been drawn up under the
3、responsibility of AECMA-STAN (TheEuropean Association of Aerospace Industries - Standardization). It is published on green paper for theneeds of the European Aerospace Industry. It has been technically approved by the experts of theconcerned Domain following member comments.Subsequent to the publica
4、tion of this Prestandard, the technical content shall not be changed to anextent that interchangeability is affected, physically or functionally, without re-identification of thestandard.After examination and review by users and formal agreement of AECMA-STAN it will be submitted as adraft European
5、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 92138 ISSY-LES-MOULINEAUX CEDEXEdition approved for publication2002-04-30Comments should be sent within six monthsafter the date of
6、 publication toAECMA-STANGulledelle 94B-1200 BRUXELLESMaterial DomainMr Evetts aecma 2002Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 2prEN 387
7、5: 2002ContentsPage0 Introduction. 31 Scope 32 Normative references. 33 Terms and definitions 44 Wording of order . 55 Health and safety 56 Technical requirements. 6Table 1 Technical requirements for lines 1 to 29, where appropriate. 8Table 2 Technical requirements for lines 30 onwards, where approp
8、riate . 13Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 3prEN 3875: 20020 IntroductionThis standard is part of the series of EN metallic materia
9、l standards for aerospace applications. The generalorganization of this series is described in EN 4258.1 ScopeThis standard defines the requirements for the ordering, manufacture, testing, inspection and delivery of allforms of filler metal for brazing for aerospace applications. It shall be applied
10、 when referred to in the ENmaterial standard unless otherwise specified on the drawing, order or inspection schedule.2 Normative referencesThis European Standard incorporates by dated or undated reference provisions from other publications.These normative references are cited at the appropriate plac
11、es in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications applyto this European Standard only when incorporated in it by amendment or revision. For undated referencesthe latest edition of the publication referred
12、 to applies.ISO 3954 Powders for powder metallurgical purposes SamplingISO 4497 Metallic powders Determination of particle size by dry sievingEN 2000 Aerospace series Quality assurance EN aerospace products Approval of the qualitysystem of manufacturersEN 2032-1 Aerospace series Metallic materials P
13、art 1: Conventional designationEN 2032-2 Aerospace series Metallic materials Part 2: Coding of metallurgical condition in deliveryconditionEN 2078 Aerospace series Metallic materials Manufacturing schedule, inspection schedule,inspection and test report Definition, general principles, preparation an
14、d approvalEN 3042 Aerospace series Quality assurance EN aerospace products Qualification procedureEN 3876 Aerospace series Test method for metallic materials Braze alloys Fusion test 1)EN 3877 Aerospace series Metallic materials Test method Determination of solidus andliquidus temperatures by differ
15、ential thermal analysis of braze alloys 1)EN 3878 Aerospace series Test method for metallic materials Braze alloys Flexibility test 1)EN 4061 Aerospace series Amorphous foil in filler metal for brazing Thickness 25 m a 64 m Dimensions 1)EN 4062 Aerospace series Rolled foil in filler metal for brazin
16、g Thickness a 1 mm Dimensions 1)EN 4063 Aerospace series Wire in filler metal for brazing Diameter 0,6 mm D 4 mm Dimensions 1)EN 4064 Aerospace series Tape in filler metal for brazing Thickness 0,075 mm a 1,5 mm Dimensions 1)EN 4066 Aerospace series Borided foil in filler metal for brazing Thickness
17、 25 m a 100 m Dimensions 1)EN 4258 Aerospace series Metallic materials General organization of standardization Linksbetween types of EN standards and their useEN 4259 Aerospace series Metallic materials Definition of general terms 1)EN 4268 Aerospace series Metallic materials Heat treatment faciliti
18、es General requirements 2)1) Published as AECMA Prestandard at the date of publication of this standard2) In preparation at the date of publication of this standardCopyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo repro
19、duction or networking permitted without license from IHS-,-,-Page 4prEN 3875: 20023 Terms and definitionsFor the purposes of this standard, the following terms and definitions apply:Definition of general terms, see EN 4259.3.1 method of melting3.1.1air meltingmelting of charge is carried out in air
20、i.e. without vacuum or inert atmosphere, using a protective slag, whenrequired3.1.2vacuum meltingmelting of the charge is carried out in vacuum3.1.3inert gas meltingmelting of the charge is carried out in an inert atmosphere3.2atomizationprocess by which molten metal is separated into droplets which
21、 solidify as a powder:a) Gas atomization: a process of impingement at high velocity of a stream of molten metal in an inert gas toproduce droplets which solidify in flight to procedure a powder.b) Rotating electrode atomization: a process in which the extremity of a rotating consumable electrode ism
22、elted by an appropriate heat source (for example: electric arc, electron beam), in such a way that thedroplets are ejected from the periphery of the electrode and solidify into a powder.c) Spinning disk atomization: a process in which a molten metal is poured onto a rotating solid surface insuch a w
23、ay that the molten metal droplets are ejected from the surface and solidify in an inert gas toproduce a powder.d) Vacuum atomization: a process in which a stream of molten metal, over saturated by a pressurised inertgas, is introduced in a vessel under vacuum so that the stream is disintegrated by t
24、he gas expansion toproduce droplets which solidify to produce a powder.e) Water atomization: a process in which a high velocity water spray impinges on to molten metal to producemetal droplets which solidify to produce a powder. The powder is cooled to room temperature by water orunder an inert gas.
25、3.3braze powdersolidified product resulting from the atomization process3.4powder blendproduct obtained by blending one or more powder cast atomized and sieved in accordance with the materialstandard under the same production conditions3.5braze wirewrought product of uniform solid section supplied i
26、n straight length, coils or on spoolsCopyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 5prEN 3875: 20023.6braze foila) rolled foil: flat rolled prod
27、uct of rectangular section and uniform thickness up to 1 mm, supplied in flatlengths, or in coils with slit edgesb) amorphous foil: product obtained from a stream of molten metal poured onto a solid surface and rapidlycooled, substantially without a crystalline structurec) borided foil: rolled foil
28、with boron, or boron and other elements, diffused into the surface3.7braze tapea powder mixed with a binder to form a paste, which is spread on a plasticizer in the form of a tapeThe tape may have a pressure sensitive adhesive, protected by a release layer applied to the side oppositeto the plastici
29、zer.3.8binderan organic resin dissolved in a solvent or dispersed in an aqueous carrier3.9plasticizera flexible organic sheet material capable of being coated with braze alloy on one side3.10release layera protective layer covering the pressure sensitive adhesive coating3.11braze pastepowder mixed w
30、ith a suitable binder4 Wording of orderThe order shall clearly indicate: quantities to be supplied; dates of delivery; material standard number; delivery condition; dimensions and tolerances or reference to an appropriate dimensional standard; specific weight for tape; forwarding address; nature and
31、 type of packing, if required; definition and frequency of any special tests and their retest procedures, if required.5 Health and safetyThe product in the delivery condition shall fulfil the health and safety laws of the area of the country whenand where it is to be delivered.A product safety data
32、sheet shall be available.Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 6prEN 3875: 20026 Technical requirements6.1 GeneralThe product shall be m
33、anufactured in accordance with the requirements of the relevant material standardand the applicable requirements of this specification. A manufacturing schedule shall be established andapplied in accordance with EN 2078.Product shall satisfy the requirements of the material standard and/or order and
34、 shall be free fromirregularities prejudicial to the subsequent manufacture or use of this product.Not withstanding previous acceptance complying with this material standard, any product that is found, at alater stage, to contain such defects shall be rejected.Unless otherwise specified, the require
35、ments in tables 1 and 2 shall apply in conjunction with those of therelevant material standard. Table 1 relates to lines 1 to 29 (inclusive) of the material standard and table 2relates to lines 30 onwards in which the sub-line format is also used. Lines 2 to 98 may also be opened inline 100 if the m
36、aterial standard details specific qualification requirements. If a specific line number is notshown in tables 1 and 2, the requirement is stated in the material standard and/or order.6.2 Qualification requirementsQualification requirements when invoked by the material standard and/or order are detai
37、led in tables 1 and 2.Unless otherwise agreed between the manufacturer and purchaser the qualification phase shall be run onthe first three batches.6.3 Release requirements6.3.1 Release testsRelease testing shall be the responsibility of the manufacturer.The purchaser reserves the right to perform a
38、ny of the inspections and/or tests required by the materialstandard and/or order.The test samples shall be representative of the product.When required the manufacturer shall inform the purchaser of the planned dates for extraction of samplesand release testing in order that these operations may be w
39、itnessed.Tables 1 and 2 detail the requirements for each line of the material standard. Unless otherwise specificallyrequested by the purchaser, a particular inspection and/or test for release shall be carried out ifcorresponding acceptance criteria and/or values are stated in the applicable materia
40、l standard, but see also6.3.5 “Capability clause“.6.3.2 RetestsIf the test procedure or test piece preparation is faulty, testing shall be re-applied at the original frequencyafter rectification of the original cause of failure.When failure cannot be attributed to faulty testing, or test piece prepa
41、ration, further test samples shall beselected at twice the original frequency from the product, one of which shall be that on which the originalresults were obtained unless already withdrawn by the manufacturer after suitable identification of the causeof failure. If all retest results are satisfact
42、ory, the batch shall be accepted. If one or more tests areunsatisfactory, the batch shall be: rejected, or 100 % retested and the conforming lengths accepted, or partially or fully re-heat treated if heat treatment can rectify the cause of the failure and tested as acompletely new batch except for c
43、hemical composition. No product or test sample shall be re-heat treatedmore than twice.Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 7prEN 3875:
44、 20026.3.3 RejectionAny failure to meet the requirements of the material standard shall be cause for rejection.6.3.4 Special testsSpecial tests may be required by the purchaser. In such cases, the nature of the test, method, frequency andtechnical requirements shall be specified on the order or insp
45、ection schedule and shall be mutually agreedby the manufacturer and the purchaser.6.3.5 Capability clauseWhere the capability clause is invoked and where sufficient statistical evidence exists, the test need not becarried out (unless specifically requested by the purchaser). However, this in no way
46、reduces the obligationsof the manufacturer to fulfill the requirements. If subsequent testing indicates that the product does notcomply with the requirements, the batch shall be rejected.If sufficient statistical evidence does not exist, the test shall be carried out at a frequency agreed betweenthe
47、 manufacturer and purchaser.6.3.6 Statistical process controlReduction in the extent of release testing, other than that defined in 6.3.5 “capability clause“ above may benegotiated with the purchaser on the basis of appropriate statistical process control and/or statistical data.6.3.7 Inspection and
48、 test reportThe manufacturer shall furnish, with each delivery, a report conforming to the requirements of EN 2078stating the following: manufacturers name and address and, if appropriate, identification of the plant; order number; material standard number; delivery condition and metallurgical code
49、of the product; quantity or weight supplied, whichever is relevant; cast and batch number; results of the tests, re-tests and chemical analysis; description of supplies; inspection stamp.6.4 TraceabilityEach product shall be traceable to the cast production batch and/or heat treatment batch at all stage
