1、AEROSPACE MATERIAL SPECIFICATIONAMS2662Issued 1998-11Reaffirmed 2014-07Brazing, Gold-Nickel Alloy Filler MetalRATIONALEAMS2662 has been reaffirmed to comply with the SAE five year review policy._SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state o
2、f 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 reviews each technical report at least every five years a
3、t which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2014 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electr
4、onic, 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: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your i
5、nput. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS26621 SCOPE:1.1 Purpose:This specification covers the engineering requirements for producing brazed joints in parts made ofsteels, iron alloys, nickel alloys, and cobalt alloys using gold-nickel a
6、lloy filler metal.1.2 Application:This process has been used typically for joints requiring high strength and corrosion and oxidationresistance up to 1300 F (704 C), but usage is not limited to such applications.1.3 Safety - Hazardous Materials:While the materials, methods, applications, and process
7、es described or referenced in thisspecification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health an
8、d safety of allpersonnel involved.2. APPLICABLE DOCUMENTS: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 issue ineffect on the date of the purchase o
9、rder.2.1 SAE Publications:Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2403 Plating, Nickel, General PurposeAMS 2424 Plating, Nickel, Low-Stressed DepositAMS 4787 Gold-Nickel Alloy Brazing Filler Metal, High Temperature, 82Au - 18Ni,1740 F (949 C) Solidus-Liquidus Temper
10、atureSAE INTERNATIONAL AMS2662 Page 2 of 8 3. TECHNICAL REQUIREMENTS:3.1 Materials:3.1.1 Filler Metal: Shall conform to AMS 4787, unless otherwise specified. (See 8.1).3.1.2 Flux: Fluxes shall not be used, unless acceptable to purchaser.3.2 Equipment:Furnaces, with suitable protective atmospheres as
11、 defined in 3.3, shall be used for brazing unlesselectrical induction, electrical resistance heating, or other method is permitted by purchaser. Where brazing is concurrent with heat treatment, the pyrometry requirements of the applicable heat treatment specification shall be applied.3.3 Atmosphere
12、shall be as follows: 3.3.1 Hydrogen of not less than 99.99% purity and dew point not higher than -60 F (-51 C).3.3.2 Argon of not less than 99.99% purity and dew point not higher than -60 F (-51 C).3.3.3 Mixtures of argon and hydrogen in any proportions, the hydrogen purity being as specified in 3.3
13、.1,the argon purity being as specified in 3.3.2, and the dew point of the mixture being not higher than -60 F (-51 C).3.3.4 Vacuum of 5 x 10-4Torr or lower pressure. Back-fill to a higher pressure with a non-oxidizing atmosphere is permitted (See 3.3.2 and 3.3.3).3.4 Preparation:3.4.1 Surface Condit
14、ion: The surfaces to be joined shall be clean prior to assembly.3.4.2 Nickel Plating: Joints shall be prepared as noted in Table 1 by nickel plating faying surfaces inaccordance with AMS 2403, AMS 2424 or other procedure acceptable to purchaser.SAE INTERNATIONAL AMS2662 Page 3 of 8 3.4.2.1 Unless ot
15、herwise specified, nickel plating on areas other than the faying surface and adjacentfillet is prohibited.3.4.3 Assembly: Parts to be joined shall be assembled so that the clearances between mating surfaces are within specified tolerances. When joint tolerances are not specified, the joint clearance
16、 shall be 0.001 to 0.004 inch (25 to 102 m) (See 8.2). When acceptable to purchaser tack welding or staking of assemblies may be used to facilitate assembly. The assembly shall be supported so that the parts will be in proper alignment throughout the brazing process. Filler metal sufficient to fill
17、the joint shall be placed at one end of the joint unless otherwise specified. In the case of blind joints, the filler metal shall be preplaced at the blind end of the joint unless otherwise specified.3.4.3 Fluxing: When use of flux is permitted, flux shall be applied to the joint areas of parts. Gas
18、eous hydrogen fluoride pre-cleaning/fluxing may be performed, when acceptable to purchaser.3.5 Procedure:3.5.1 Joining: Parts shall be heated in equipment as in 3.2 using an atmosphere as in 3.3 until the fillermetal melts and the joint is formed. The brazing temperature shall be from 25 to 200 F(14
19、 to 111 C) degrees above the liquidus for the filler metal used.3.5.2 Cooling: After brazing, assemblies shall be cooled in a manner and a rate that will prevent cracks and minimize internal stress, distortion, scaling, and decarburization. Cooling from the brazing temperature to below the scaling t
20、emperature shall be performed in one of the atmospheres described in 3.3. If hardening is to be executed in conjunction with brazing, cooling proceduresmay be revised accordingly.3.5.3 Rebrazing: Parts may be rebrazed a maximum of two times using the original brazing process andtime and temperature
21、cycle. Braze filler metal may be added at any portion of the joint provided that there was evidence of braze at that portion or if the joint is subsequently radiographically examined.TABLE 1 - Nickel Plating Thickness Requirements for Furnace Selected AtmosphereAlloyNickel Plating ThicknessInch (m)V
22、acuumNickel Plating ThicknessInch (m)Non-oxidizing GasPrecipitation Hardenable Iron Alloys 0.0001 to 0.0006 (2.5 to 15) 0.0004 to 0.0012 (10 to 30)with Ti + Al content over 0.4%.Precipitation Hardenable Nickel Alloys 0.0001 to 0.0006 (2.5 to 15) 0.0004 to 0.0012 (10 to 30)with Ti + Al content over 0
23、.4%.All other alloys Optional to 0.0006 (15), max Optional to 0.0006 (15), maxSAE INTERNATIONAL AMS2662 Page 4 of 8 3.6 Post Treatment:3.6.1 Flux Removal: After brazing and cooling, the residues of flux, if used, shall be removed from the parts by a method not injurious to the material or specified
24、surface finish.3.6.2 Heat Treatment: Where heat treatment is required and the heat treatment temperature is below1780 F (971 C), the heat treatment shall follow the brazing operations or, when acceptable topurchaser, may be performed during the post-braze cool down.3.7 Properties:Brazed parts shall
25、conform to the following requirements:3.7.1 Appearance: Examination of visible joint edges shall show the presence of filler metal for 100% ofthe joint edge.3.7.2 Coverage: The area joined by filler metal shall not be less than 80% of the area of the matingportions of the assembly, determined by a m
26、ethod acceptable to purchaser, such as tear testing, metallographic sectioning or radiographic examination.3.7.3 Proof Test: When specified, parts shall pass a proof test determined by a method acceptable topurchaser.3.8 Quality:Brazed joints shall be sound, clean, and free from foreign materials an
27、d from imperfections detrimental to performance of the brazed joints.3.8.1 Surfaces of parts shall be free from excessive filler metal that interferes with form, fit, function or reliability.3.8.2 The presence of unmelted filler metal is not acceptable.3.8.3 Erosion of the base metal shall not excee
28、d 20% of the thinnest member or 0.002 inch (51 m), whichever is less.3.8.4 Depth of diffusion or alloying at the joint shall not exceed 0.004 inch (102 m), measured from the original base metal surface.SAE INTERNATIONAL AMS2662 Page 5 of 8 4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Inspe
29、ction:The processor shall supply all samples for processors tests and shall be responsible for performance of all required tests. Where actual or simulated parts are required for processors tests,such parts shall be supplied by purchaser. Purchaser reserves the right to sample and to performany conf
30、irmatory testing deemed necessary to ensure that processing conforms to specifiedrequirements.4.2 Classification of Tests:4.2.1 Acceptance Tests: Appearance (3.7.1), quality (3.8.1), nondestructive examination for braze coverage, when specified (3.7.2) and proof test, when specified (3.7.3) are acce
31、ptance tests andshall be performed on each lot.4.2.2 Periodic Tests: Destructive examination for braze coverage, when specified (3.7.2), depth of diffusion (3.8.4) and erosion (3.8.3) are periodic tests and shall be performed at a frequency selected by the processor unless frequency of testing is sp
32、ecified by purchaser.4.2.3 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall beperformed prior to or on the initial shipment of brazed parts to a purchaser, when any change inmaterial and/or processing requires approval by purchaser (See 4.4.2), and when pur
33、chaser deems confirmatory testing to be required.4.3 Sampling and Testing:Shall be not less than the following; a lot shall be all assemblies of the same part number brazed inthe same equipment without breakdown of setup and presented for processors inspection at onetime:4.3.1 For Acceptance Tests:
34、Shall be as shown in Table 2.SAE INTERNATIONAL AMS2662 Page 6 of 8 4.3.2 For Preproduction Tests: One or more joints (to be determined by purchaser) shall be destructively examined for all technical requirements.4.4 Approval:4.4.1 The process and control factors, or a preproduction sample, or both,
35、whichever is specified by purchaser, shall be approved by purchaser before production parts are supplied.4.4.2 The processor shall make no significant change to materials, processes, or control factors fromthose on which the approval was based, unless the change is approved by purchaser (See 4.2.3).
36、A significant change is one which, in the judgment of the cognizant engineering organization, could affect the properties or performance of the parts.4.4.3 Control factors shall include but not be limited to the following: Brazing filler metalSurface preparation, including use of nickel plateFluxing
37、Brazing filler metal preplacement, quantity, and formMethod of applying or attaching brazing filler metalFixturing of partsType of heating equipment and atmosphereBrazing temperatureHeating and cooling temperature profilesConcurrent heat treatment, if performedPost cleaning of flux residuePeriodic t
38、est planOrientation of parts in the furnaceTack welding and stakingTABLE 2 - Sampling for Acceptance TestsNumber ofin LotQuality,Appearanceand Proof TestNDT forCoverageUp to 7 All 38 to 15 All 416 to 40 All 541 to 110 All 6111 to 300 All 7301 to 500 All 8Over 500 All 9SAE INTERNATIONAL AMS2662 Page
39、7 of 8 4.5 Reports:4.5.1 The processor or brazed parts shall furnish with each shipment a report stating that the parts have been brazed and tested in accordance with specified requirements, that they conform to theacceptance test requirements and, when performed, the results of tests to determine c
40、onformance to the periodic test requirements. This report shall include the purchase order number, lot number,AMS 2662, part number, quantity, and method/frequency of braze coverage test.4.6 Resampling and Retesting:4.6.1 If any acceptance test fails to meet specified test requirements, all assembli
41、es shall be inspected for the nonconforming requirement. Assemblies that conform to requirements shall be accepted;assemblies that are nonconforming may be rebrazed as stated in 3.5.3 and retested or shall be subject to rejection.4.6.2 If the results of any periodic tests fails to meet the specified
42、 requirements, the process in nonconforming. No additional parts shall be brazed until the process is corrected and new specimens are brazed and retested. Results of all tests shall be recorded and, when requested,reported. Purchaser shall be notified of all parts brazed since the last acceptable te
43、st.5. PREPARATION FOR DELIVERY:5.1 Brazed parts shall be handled and packaged to ensure that the required physical characteristics andproperties of the brazed parts will be preserved.5.2 Packages of parts shall be prepared for shipment in accordance with commercial practice and incompliance with app
44、licable rules and regulations pertaining to the handling, packaging, andtransportation of the parts to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENT:The processor shall mention this specification number and its revision letter in all quotations and whenacknowledging purchase orders.7
45、. REJECTIONS:Assemblies not brazed in accordance with this specification, or to modifications authorized bypurchaser, will be subject to rejection and shall be reported to the purchaser.8. NOTES:8.1 Filler metals AMS 4784, 4785 or 4786 may be specified by the purchaser in lieu of AMS 4787 forparticu
46、lar applications. Recommended joint clearances, brazing temperatures, furnaceatmospheres, and resulting properties are dependent on the selected filler metal.SAE INTERNATIONAL AMS2662 Page 8 of 8 8.2 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary;dimensions
47、 and properties in SI units and the Celsius temperatures are shown as the approximateequivalents of the primary units and are presented only for information.8.3 Purchasing documents should specify not less than the following:AMS 2662MaterialBrazing filler metal if other than AMS 4787Heat treatment i
48、f requiredMethod for determining area joined by filler metal (See 3.7.2)Standards for acceptance and method of test when proof test is required (See 3.7.3)Number of joints, parts or samples for preproduction tests (See 4.3.2)Part number and quantity of parts to be brazed8.4 Similar Specifications:MI
49、L-B-7883 is listed for information only and shall not be construed as an acceptable alternateunless all requirements of this AMS are met.8.5 Processes meeting the requirements of this specification have been classified under Federal Standardization Area Symbol “THJM”.8.6 Key Words: Brazed joints, cobalt alloys, nickel alloys, ferrous alloys, corrosion resistant, oxidation resistance.PREPARED UNDER THE JURISDICTION OF AMS
