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 2002Page 2prEN 3875: 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 f
7、or lines 1 to 29, where appropriate. 8Table 2 Technical requirements for lines 30 onwards, where appropriate . 13Page 3prEN 3875: 20020 IntroductionThis standard is part of the series of EN metallic material standards for aerospace applications. The generalorganization of this series is described in
8、 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 when referred to in the ENmaterial standard unless otherwise specified on the drawing, order
9、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 places in the text and the publications are listedhereafter. For dated references, subsequent amen
10、dments 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 to applies.ISO 3954 Powders for powder metallurgical purposes SamplingISO 4497 Metallic powde
11、rs 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 Part 1: Conventional designationEN 2032-2 Aerospace series Metallic materials Part 2: Coding of
12、 metallurgical condition in deliveryconditionEN 2078 Aerospace series Metallic materials Manufacturing schedule, inspection schedule,inspection and test report Definition, general principles, preparation and approvalEN 3042 Aerospace series Quality assurance EN aerospace products Qualification proce
13、dureEN 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 differential thermal analysis of braze alloys 1)EN 3878 Aerospace series Test method for metallic ma
14、terials 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 brazing Thickness a 1 mm Dimensions 1)EN 4063 Aerospace series Wire in filler metal for brazing Diam
15、eter 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 25 m a 100 m Dimensions 1)EN 4258 Aerospace series Metallic materials General organization of
16、 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 facilities General requirements 2)1) Published as AECMA Prestandard at the date of publication of this
17、 standard2) In preparation at the date of publication of this standardPage 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 ou
18、t in air 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 dropl
19、ets which 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 elec
20、trode ismelted 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 i
21、nsuch a way 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 disintegr
22、ated by the 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 i
23、nert gas.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 s
24、upplied in straight length, coils or on spoolsPage 5prEN 3875: 20023.6braze foila) rolled foil: flat rolled product 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 on
25、to a solid surface and rapidlycooled, substantially without a crystalline structurec) borided foil: rolled foil 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
26、may have a pressure sensitive adhesive, protected by a release layer applied to the side oppositeto the plasticizer.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
27、.10release layera protective layer covering the pressure sensitive adhesive coating3.11braze pastepowder mixed with a suitable binder4 Wording of orderThe order shall clearly indicate: quantities to be supplied; dates of delivery; material standard number; delivery condition; dimensions and toleranc
28、es or reference to an appropriate dimensional standard; specific weight for tape; forwarding address; nature and 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
29、the health and safety laws of the area of the country whenand where it is to be delivered.A product safety data sheet shall be available.Page 6prEN 3875: 20026 Technical requirements6.1 GeneralThe product shall be manufactured in accordance with the requirements of the relevant material standardand
30、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 shall be free fromirregularities prejudicial to the subsequent manufacture or use of
31、 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 requirements in tables 1 and 2 shall apply in conjunction with those of therelevant material
32、 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 material standard details specific qualification requirements. If a specific line numb
33、er 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 detailed in tables 1 and 2.Unless otherwise agreed between the manufacturer and purchaser
34、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 any of the inspections and/or tests required by the materialstandard and/or order.The
35、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 witnessed.Tables 1 and 2 detail the requirements for each line of the material standar
36、d. 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 material standard, but see also6.3.5 “Capability clause“.6.3.2 RetestsIf the test procedure
37、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 preparation, further test samples shall beselected at twice the original frequency from th
38、e 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 satisfactory, the batch shall be accepted. If one or more tests areunsatisfactory, the batch s
39、hall 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 chemical composition. No product or test sample shall be re-heat treatedmore than twic
40、e.Page 7prEN 3875: 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
41、 the order or inspection 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). Howeve
42、r, this in no way 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
43、 agreed betweenthe 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.
44、3.7 Inspection and 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 m
45、etallurgical code 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 treatm
46、ent batch at all stages ofmanufacture and delivery.6.5 Expiry dateFor paste and tape, the manufacturer shall certify that the product, maintained in its original packing andstored in the specified conditions, is guaranteed until an expiry date written on the marking. This date shallbe at least six m
47、onths later than the delivery date.Page 8prEN 3875: 2002Table 1 Technical requirements for lines 1 to 29, where appropriateFrequency of testingMaterial standard linereferenceNo TitleRequirementsQualification Release1 Material designation See EN 2032-1. - 2 Chemical composition The chemical compositi
48、on shall comply with the requirements of the relevant material standard.The chemical composition of each cast, or, in the case of a powder or powder related product, eachpowder blend shall be determined. Samples for analytical purposes shall be representative of the cast, orpowder blend.The method o
49、f analysis shall be at the option of the manufacturer. In cases of dispute the method in therelevant ISO standard shall be used. If no ISO standard exists, an analytical method, which can becalibrated to an agreed reference standard, shall be used.Elements that are not specified in the material standards shall not be intentionally added to the alloy.a) 2 per cast orpowder batcha) 1 per cast orpowder batch3 Method of melting As st
