1、AEROSPACE MATERIAL SPECIFICATIONAMS2664 REV. F Issued 1968-05 Revised 1995-07 Reaffirmed 2014-07 Superseding AMS2664E Brazing, Silver For Use Up to 800 F (427 C) RATIONALE AMS2664F has been reaffirmed to comply with the SAE five year review policy. _ SAE Technical Standards Board Rules provide that:
2、 “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE
3、reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval
4、 system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerSe
5、rvicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS2664F 1. SCOPE:1.1 Purpose:This specification covers the engineering requirements for producing brazed joints in parts madeof ste
6、els, iron alloys, nickel alloys, and cobalt alloys by use of silver alloy filler metals, and theproperties of such joints.1.2 Application:This process has been used typically for joints requiring high strength up to 800 F (427 C), butusage is not limited to such applications.2. APPLICABLE DOCUMENTS:
7、The following publications form a part of this specification to the extent specified herein. The latestissue of SAE publications shall apply. The applicable issue of other publications shall be the issuein effect on the date of the purchase order.2.1 SAE Publications:Available from SAE, 400 Commonwe
8、alth Drive, Warrendale, PA 15096-0001.AMS 2403 Plating, Nickel, General PurposeAMS 2424 Plating, Nickel, Low Stressed DepositAMS 3411 Flux, Silver Brazing, High TemperatureAMS 3417 Flux, Brazing, High TemperatureSAE INTERNATIONAL AMS2664F Page 2 of 9 2.1 (Continued):AMS 4765 Filler Metal, Silver, Br
9、azing, 56Ag - 42Cu - 2.0Ni, 1420 to 1640 F(771 to 893 C) Solidus-Liquidus RangeAMS 4772 Silver Alloy Brazing Filler Metal, 54Ag - 40Cu - 5.0Zn - 1.0Ni, 1325 to 1575 F(718 to 857 C) Solidus-Liquidus RangeAMS 4774 Silver Alloy Brazing Filler Metal, 63Ag - 28.5Cu - 6.0Sn - 2.5Ni, 1275 to 1475 F(691 to
10、802 C) Solidus-Liquidus Range2.2 ASTM Publications:Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM D 1179 Fluoride Ion in WaterASTM D 1193 Reagent Water2.3 U.S. Government Publications:Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue,Philadel
11、phia, PA 19111-5094.MIL-STD-2073-1 DOD Materiel, Procedures for Development and Application of PackagingRequirements3. TECHNICAL REQUIREMENTS:3.1 Materials:3.1.1 Flux: Shall conform to AMS 3411, AMS 3417, or other flux acceptable to purchaser.3.1.2FillerMetal:ShallconformtoAMS4765,AMS 4772,or,whensp
12、ecified,AMS4774.AMS 4765is recommended for brazing in protective atmopheres. AMS 4772 is recommended for use withflux.3.2 Preparation:3.2.1 Surface Condition: The surfaces to be joined shall be clean prior to assembly. Surfaces shallnot be polished.3.2.2 Nickel Plating (Required for Induction and Fu
13、rnace Brazing Without Flux): Joint surfaces onparts made of any steel or alloy having a specified titanium or aluminum content, either as amaximum or a range, shall be nickel plated in accordance with AMS 2403 or AMS 2424, exceptthat plating will not be required on materials in which the specified m
14、aximum titanium content isnot greater than 0.30% or the specified maximum aluminum content is not greater than 0.20%or the specified maximum sum of aluminum plus titanium contents is not greater than0.50 percent. Thickness of plating shall be 0.0001 to 0.0006 inch (2.5 to 15.0 m). Platingshall not e
15、xtend beyond the intended joint plus fillet surfaces.SAE INTERNATIONAL AMS2664F Page 3 of 9 3.2.2.1 Nickel plating may be used on steels and alloys not having a specified titanium or aluminumcontent when such parts are to be brazed in an atmosphere permitted in 3.3.3.2.3.2.3 Post Plating Stress Reli
16、ef Treatment: Prior to brazing, nickel plated tube joints shall be(R) induction heated to 1850 F 50 (1010 C 28) and held at heat for not less than ten secondsto avoid stress corrosion. Other parts may also be stress relieved, as required, to avoid stresscorrosion. Stress relief prior to brazing is n
17、ot required for parts to be furnace brazed.3.3 Procedure:3.3.1 Fluxing: Unless parts are to be brazed in a protective atmosphere as defined in 3.3.3.2, flux asspecified in 3.1.1 shall be applied so that the surfaces to be joined are completely coated.3.3.2 Assembly:3.3.2.1 Clearances: Detail parts,
18、after nickel plating when plating is used, shall be assembled so thatthe clearances between mating surfaces are within tolerances specified on the drawing.Where clearances are not specified, joint clearance shall be as shown in Table 1.TABLE 1 - Joint ClearanceType of Joint ClearanceDiametrally Meas
19、ured Joints(e.g. Tube to Sleeve Joints)0.002 to 0.005 inch (0.051 to 0.127 mm)Lap or Butt JointsFurnace BrazedOther than furnace brazed0.001 to 0.004 inch (0.025 to 0.102 mm)0.001 to 0.005 inch (0.025 to 0.127 mm)3.3.2.2 FillerMetalPreplacement:Sufficientfillermetalshallbefedorpreplaced,atorinclosep
20、roximity to only one end of the joint, to completely fill the joint. Not more than 15% of themating surfaces may be shimmed with filler metal to aid in setting clearances.3.3.2.3 Fixturing: The assembly shall be supported so that parts will be in proper alignment after(R) brazing. Unless otherwise s
21、pecified, fusion arc tack welding of tube assemblies is notpermitted. Staking and prick punching may be used where applicable provided they arecompletely covered with filler metal in the completed assembly.3.3.3 Joining: Shall be accomplished by furnace heating in a protective atmosphere as defined
22、in3.3.3.2, by induction heating with an atmosphere as in 3.3.3.2 surrounding the work, or by usingflux and furnace heating, induction heating, or neutral flame torch heating, (See 3.3.3.3), unlessa specific method of heating is specified. Parts shall be heated until the joint is formed. Furtherheati
23、ng shall be held to a minimum. Brazing temperature shall not exceed 1900 F (1038 C).SAE INTERNATIONAL AMS2664F Page 4 of 9 3.3.3.1 When permitted by purchaser, resistance heating may be used for producing nonstructuraljoints, such as spacing collars on tubes, provided that the heating is accomplishe
24、d by passingthe current through one member of the joint, so that the resistance of the part rather than theresistance across the joint is the source of heating, and, provided that brazing is done in aprotective atmosphere as defined in 3.3.3.2.3.3.3.2 Protective atmospheres for brazing shall be one
25、of the following:3.3.3.2.1 Hydrogen, 99.95% minimum purity and dew point not higher than -25 F (-32 C).3.3.3.2.2 Argon of not less than 99.99% purity and dew point not higher than -35 F (-37 C).3.3.3.2.3 Mixtures of hydrogen and argon as specified in 3.3.3.2.1 and 3.3.3.2.2 in any proportion.3.3.3.2
26、.4 Vacuum, absolute pressure not exceeding 20 microns (20 m) of mercury. Backfilling withargon, up to 20 microns (20 m) of mercury, is permitted.3.3.3.3 Silverbrazingbythetorchmethodshallbeperformedonlybyoperatorswhohavebeenqualified, by a procedure acceptable to purchaser, to braze metals specified
27、 for eachassembly.3.3.4 Cooling: After brazing, but prior to handling, assemblies shall be cooled for sufficient time toallow the filler metal to solidify and in a manner which prevents cracks and minimizes internalstress, distortion, oxidation, decarburization, and scaling.3.3.5 Flux Removal: After
28、 brazing and cooling, flux shall be removed by a method not injurious to the(R) specified surface finish.3.4 Properties: Brazed parts shall conform to the following requirements:3.4.1 Coverage:3.4.1.1 Examination of all visible joint edges shall show presence of brazing filler metal for 100% ofeach
29、joint.3.4.1.2 The area joined by filler metal shall be not less than 80% of the mating portions of theassembly.3.4.2 Proof Pressure Test: When specified by purchaser, any part from a lot shall pass the proof(R) pressure test.SAE INTERNATIONAL AMS2664F Page 5 of 9 3.5 Quality:3.5.1 Brazed joints, as
30、received by purchaser, shall be sound, clean, and free from foreign materialsand from imperfections detrimental to performance of the brazed joints.3.5.1.1 Surfaces shall be free from carburization, decarburization, nitriding, dezincification, and heavytemper color or oxidation.3.5.1.2 Surfaces of a
31、ssemblies shall be free from pitting and burning, and free from excessive fillermetal that may interfere with form, fit, or function.3.5.1.3 Joints shall be free from cracks and from unflowed filler metal.3.5.1.4 Surfaces of brazed parts shall be free of residual flux.(R)4. QUALITY ASSURANCE PROVISI
32、ONS:4.1 Responsibility for Inspection:(R)The processor of brazed assemblies shall supply all samples for processors tests and shall beresponsible for performing all required tests. Parts, if required for test, shall be supplied bypurchaser. Purchaser reserves the right to sample and to perform any c
33、onfirmatory testingdeemed necessary to ensure that processing conforms to the requirements of this specification.4.2 Classification of Tests:4.2.1 Acceptance Tests: All technical requirements, except for presence of carburizing,(R) decarburizing, nitriding, and dezincification (3.5.1.1), are accepta
34、nce tests and shall beperformed on each lot.4.2.2 Preproduction Tests: All technical requirements are preproduction tests and shall be performed(R) prior to or on the initial shipment of brazed parts to a purchaser, when a change in materialand/or processing requires approval by the cognizant engine
35、ering organization (See 4.4.2), andwhen purchaser deems confirmatory testing to be required. For preproduction testing, at leastone joint shall be destructively examined for braze coverage and for evidence of carburization,decarburization, nitriding, dezincification, and other deleterious effects.4.
36、2.2.1 For direct U.S. Military procurement, substantiating test data and, when requested,preproduction test material shall be submitted to the cognizant agency as directed by theprocuring activity, contracting officer, or request for procurement.SAE INTERNATIONAL AMS2664F Page 6 of 9 4.3 Sampling an
37、d Testing:(R)Shall be not less than that shown in Table 2, with samples selected randomly from the lot, unlessanother sampling plan is specified by purchaser. A lot shall be all parts of the same part numberbrazed in the same operators work shift, or, for furnace brazing, in the same furnace load, a
38、ndpresented for processors inspection at one time.TABLE 2 - Sampling for Acceptance TestingNumber of PartsQuality(See 4.3.1)Tests(See 4.3.2)Tests(See 4.3.3)1to 6 All 3 07to 15 All 4 016 to 40 All 4 041 to 110 All 5 1111 to 300 All 6 2301 to 500 All 7 3501 to 700 All 8 5All 10 7701 to 1200over 1200 A
39、ll 15 104.3.1 Quality includes close visual inspection of all joints for completeness of fillet and absence ofvisual residual flux.4.3.2 Tests include braze internal coverage tests (3.4.1.1) when determined non-destructively, proofpressure (3.4.2) tests, and, when halide-containing fluxes are used,
40、tests for residual halides(4.3.4).4.3.3 The test for internal coverage may be destructive as in tear testing or metallographic cross-sectioning, or may be non-destructive as in ultrasonic or radiographic inspection. The testmethod shall be any method acceptable to purchaser. When determined metallog
41、raphically orby tear test, test frequency shall be as shown. Where determined metallographically or by teartest, test frequency shall be as shown. Where individual lots are smaller than 41 parts, thefrequency shall be one part for each forty parts brazed, regardless of the lot sizes orfrequencies.4.
42、3.4 Halide Test: If the flux is known not to contain fluorides or chlorides, the test for fluorides or(R) chlorides, as applicable, need not be performed. If tests indicate the presence of halide, allparts shall be subjected to additional cleaning and testing operations until removal is complete.Tes
43、t methods are not specified. Commercial test kits are available for qualitative analysis forfluorides. However, in case of dispute the following referee test methods shall apply:SAE INTERNATIONAL AMS2664F Page 7 of 9 4.3.4.1 Chlorides: Rinse the test area with 40 to 50 ML of hot (approximately 180 F
44、 (82 C)ASTM D 1193, Type IV, water. Collect the rinse water in a 100 mL beaker and add 3 to 5drops of concentrated nitric acid (sp gr 1.42) and 2 to 3 mL of 10% silver nitrate solution. Stirthe contents of the beaker and allow to stand 5 to 10 minutes. A resulting solution as clear asa blank of ASTM
45、 D 1193, Type IV, water treated in the same manner as the rinsings indicatesthe absence of chlorides. A white-to-gray precipitate or turbidity indicates the presence ofresidual flux.4.3.4.2 Fluorides: Rinse the test area with approximately 200 mL of hot (approximately 180 F(R) (82 C) ASTM D 1193, Ty
46、pe IV, water. Collect the rinse water in a 250 mL beaker. Useapproximately 200 mL of ASTM 1193, Type IV, water as a comparison sample. Test bothsamples in accordance with ASTM D 1179. A higher concentration of fluoride in the rinsewater than in the comparison sample indicates the presence of fluorid
47、e containing residualflux.4.3.5 Examination for braze internal coverage may be waived when parts are proof tested inaccordance with instructions from purchaser.4.4 Approval:4.4.1 The process and control factors, a preproduction sample brazed part, or both, whichever is(R) specified by purchaser, sha
48、ll be approved by the cognizant engineering organization beforeproduction parts are supplied.4.4.2 The processor shall make no significant change to materials, processes, or control factors fromthose on which approval was based, unless the change is approved by the cognizantengineering organization.
49、 A significant change is one which, in the judgment of the cognizantengineering organization, could affect the properties of the parts.4.4.3 Control factors shall include, but are not limited to, the following:(R)Brazing flux or atmosphere usedBraze filler metalPlacement of filler metalType of heating equipmentBrazing cycleMethod of flux removal4.5 Reports:The processor of brazed parts shall furnish with each
