1、_ SAE Technical Standards Board Rules provide that: “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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval 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 U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.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/AMS2675H AEROSPACE MATERIAL SPECIFICATION AMS2675 REV. H Issued 1952-11 Reaffirmed 2006-09 Re
5、vised 2013-02 Superseding AMS2675G Brazing, Nickel Alloy Filler Metal RATIONALE AMS2675H expands and clarifies the role of the cognizant engineering organization (sections 3 and 4, numerous paragraphs). 1. SCOPE 1.1 Purpose This specification covers the requirements forproducing brazed joints in par
6、ts made of steels, iron alloys, nickel alloys, and cobalt alloys by use of nickel alloy filler metal. 1.2 Application This process has been used typically for joints requiring high strength and corrosion and oxidation resistance up to 1200 F (649 C), but usage is not limited to such applications. 2.
7、 APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced do
8、cument has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outsid
9、e USA), www.sae.org. AMS2403 Plating, Nickel, General Purpose AMS2424 Plating, Nickel, Low-Stressed Deposit AMS2750 Pyrometry AMS4775 Nickel Alloy, Brazing Filler Metal, 73Ni - 0.75C - 4.5Si - 14Cr - 3.1B - 4.5Fe, 1790 to 1970 F (977 to 1077 C) Solidus-Liquidus Range SAE AMS2675H Page 2 of 7 2.2 ASM
10、E Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture, Surface Roughness, Waviness and Lay 3. TECHNICAL REQUIREMENTS 3.1 Materials 3.1.1 Filler metal shall conform to
11、AMS4775, unless otherwise specified See 8.2. 3.1.2 Flux Paste or liquid fluxes shall not be used, unless permitted by the cognizant engineering organization. 3.2 Equipment Furnaces, with suitable protective atmospheres as defined in 3.3, shall be used for brazing unless electrical induction, electri
12、cal resistance heating, or other method is permitted by the cognizant engineering organization. Where brazing is concurrent with heat treatment, the pyrometry requirements of the applicable heat treatment specification shall be applied. Otherwise, pyrometry shall be in accordance with AMS2750. 3.3 A
13、tmospheres Acceptable furnace atmosphere for brazing shall be as follows: 3.3.1 Hydrogen of not less than 99.99% purity and dew point not higher than -25 F (-32 C). 3.3.2 Argon of not less than 99.99% purity and dew point not higher than -35 F (-37 C). 3.3.3 Mixtures of argon and hydrogen in any pro
14、portions, the hydrogen purity being as specified in 3.3.1, the argon purity being as specified in 3.3.2, and the dew point of the mixture being not higher than -35 F (-37 C). 3.3.4 Vacuum of 5 x 10-3Torr or better (lower pressure). Back-fill to a higher pressure may be achieved with a non-oxidizing
15、atmosphere (See 3.3.2 or 3.3.3). 3.4 Preparation 3.4.1 Surface Condition The surfaces to be joined shall be clean prior to assembly. See 8.5. 3.4.2 Nickel Plating Unless otherwise specified, joints shall be prepared as noted in Table 1 by nickel plating in accordance with AMS2403 or AMS2424. SAE AMS
16、2675H Page 3 of 7 TABLE 1 - NICKEL PLATING THICKNESS REQUIREMENTS FOR FURNACE ATMOSPHERE Alloy Nickel Plating Thickness Inch (m) Vacuum Nickel Plating Thickness Inch (m) Non-Oxidizing Gas Precipitation Hardenable Iron Alloys Precipitation Hardenable Nickel Alloys (a) Ti + Al content under 4% nominal
17、 (b) Ti + Al content 4% nominal or greater Non-precipitation Hardenable Nickel Alloys with Ti + Al content under 1% nominal All other Alloys 0.0001 to 0.0006 (2.5 to 15) 0.0001 to 0.0006 (2.5 to 15) 0.0001 to 0.0006 (2.5 to 15) Optional to 0.0006 (15), max Optional to 0.0006 (15), max 0.0004 to 0.00
18、06 (10 to 15) 0.0004 to 0.0006 (10 to 15) 0.0008 to 0.0012 (20 to 30) 0.0001 to 0.0006 (2.5 to 15) Optional to 0.0006 (15), max 3.4.2.1 Unless otherwise specified, nickel plating on areas other than the faying surface and adjacent fillet is optional and may be incomplete. 3.4.3 Assembly The parts to
19、 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 shall be 0.001 to 0.004 inch (25 to 102 m). See 8.2. When permitted by the cognizant engineering organization, tack welding may b
20、e used to facilitate assembly. The assembly shall be supported so that the parts will be in proper alignment throughout the brazing process. Sufficient filler metal shall be placed at one end of the joint. In the case of blind joints, the filler metal shall be preplaced at the blind end of the joint
21、. 3.4.4 Fluxing When use of paste or liquid flux is permitted, flux shall be applied to the joint areas of parts. Gaseous hydrogen fluoride pre-cleaning/fluxing may be performed, when permitted by the cognizant engineering organization. 3.5 Procedure 3.5.1 Joining Parts shall be heated in equipment
22、as in 3.2 using an atmosphere as in 3.3 and held at temperature until the filler metal melts and the joint is formed. The brazing temperature shall be from 25 to 200 F (14 to 111 C) above the liquidus for the filler metal used. After the filler metal melts, heating may be prolonged to aid diffusion.
23、 3.5.2 Cooling After brazing, assemblies shall be cooled in a manner and at a rate that will prevent cracks and minimize internal stress, distortion, scaling, and decarburization. Cooling from the brazing temperature to below the scaling temperature shall be performed in one of the atmospheres descr
24、ibed in 3.3. If heat treating (hardening) is to be executed in conjunction with brazing, cooling procedures may be revised accordingly. SAE AMS2675H Page 4 of 7 3.6 Post Treatment 3.6.1 Flux Removal After brazing and cooling, the residues of paste or liquid fluxes, if used, shall be removed from the
25、 parts by a method not injurious to the specified surface finish. 3.6.2 Heat Treatment Where heat treatment is required and the heat treatment temperature is below 1780 F (971 C), such heat treatment shall follow the brazing operations or, when permitted by the cognizant engineering organization, ma
26、y be performed during the post-braze cool down process. 3.7 Properties Brazed parts shall conform to the following requirements: 3.7.1 Appearance Examination of visible joint edges shall show a complete line or ring of filler metal between component parts. 3.7.2 Coverage The area joined by filler me
27、tal shall not be less than 80% of the area of the mating portions of the assembly, determined by a nondestructive or destructive method permitted by the cognizant engineering organization. 3.7.3 Proof Test When specificed by the cognizant engineering organization, parts shall be proof tested using a
28、 presssure test method permitted by the cognizant engineering organization. 3.8 Quality Brazed joints shall be sound, clean, and free from foreign materials and from imperfections detrimental to performance of the brazed joints. 3.8.1 Surfaces of parts shall be free from excessive filler metal that
29、interferes with form, fit, or function. 3.8.2 The presence of unmelted filler metal is not acceptable. 3.8.3 Erosion of the base metal shall not exceed 20% of the thinnest member or 0.002 inch (51 m), whichever is less when measured visually and during destructive examination. 3.8.4 Unless otherwise
30、 specified, the depth of diffusion of solid substitution alloying elements (e.g., chromium, nickel, cobalt, tungsten) at the joint shall not exceed 0.004 inch (102 m), measured from the original base metal surface. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The brazing facilit
31、y 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 perform any confirmatory testing
32、 deemed necessary to ensure that processing conforms to the requirements of this specification. SAE AMS2675H Page 5 of 7 4.2 Classification of Tests 4.2.1 Acceptance Tests Tests for all technical requirements in section 3 with the exception of depth of diffusion (3.8.4) are acceptance tests and shal
33、l be performed on parts, or specimens representing parts when permitted herein from each lot. See 4.3.4. 4.2.2 Periodic Tests Destructive examination for braze coverage (3.7.2), for erosion (3.8.3) and for depth of diffusion (3.8.4) are periodic tests and shall be performed at a frequency establishe
34、d by the processor unless frequency of testing is specified by the cognizant engineering organization. 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of brazed parts to a purchaser and when the cognizant enginee
35、ring organization requires confirmatory testing . 4.3 Sampling for Testing 4.3.1 Acceptance Tests Test samples shall be randomly selected from all parts in the lot. A lot shall be all parts of the same part number, brazed in the same equipment in a continuous series of operations (3.4.3 through 3.6)
36、 and presented for processors inspection at one time. Unless the cognizant engineering organization specifies a sampling plan, the minimum number of samples shall be as shown in Table 2. TABLE 2 - SAMPLING FOR ACCEPTANCE TESTS Number of Parts in Lot Quality and Appearance Nondestructive Coverage Up
37、to 7 8 to 15 16 to 40 41 to 110 111 to 300 301 to 500 Over 500 All 7 10 15 25 35 50 3 or all* 4 4 5 6 7 8 *Whichever is less 4.3.1.1 Sampling for destructive coverage testing shall be specified by the cognizant engineering organization. 4.3.1.2 Proof Test As specifed by the cognizant engineering org
38、anization. 4.3.2 Periodic Tests Sample quantity for periodic tests shall be at the discretion of the processor unless otherwise specified by the cognizant engineering organization or herein. 4.3.3 Preproduction Tests One or more joints shall be destructively examined for braze coverage, erosion, dep
39、th of diffusion, and for evidence of surface contamination, carburization, decarburization, or other deleterious effects. SAE AMS2675H Page 6 of 7 4.3.4 Sample Configuration Unless otherwise permitted by the cognizant engineering organization actual parts shall be selected as samples for tests. Spec
40、imen configuration other than actual parts shall be approved by the cognizant engineering organization. When representative specimens are used for acceptance testing, test results shall be correlated with those of parts, since properties, such as thickness, may differ between parts and representativ
41、e test specimens. 4.4 Approval 4.4.1 The process and control factors, or a preproduction sample, or both, whichever is specified by the cognizant engineering organization, shall be approved by the cognizant engineering organization before production parts are supplied. 4.4.2 If the processor makes a
42、 significant change to any material, process, or control factor from that which was used for process approval, all preproduction tests shall be performed and the results submitted to the cognizant engineering organization for process reapproval. A significant change is one which, in the judgment of
43、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: Surface preparation, including use of nickel plate Brazing filler metal preplacement, quantity, and form Method of applying or att
44、aching brazing filler metal Type of heating equipment and atmosphere Brazing temperature Heating and cooling temperature profiles Concurrent heat treatment, if performed Periodic test plan. 4.5 Reports The processor of brazed parts shall furnish with each shipment a report stating that the parts hav
45、e been brazed and tested in accordance with specified requirements and that they conform to the acceptance test requirements. This report shall include the purchase order number, lot number, AMS2675H, part number, quantity, and method/frequency of braze coverage test. 5. PREPARATION FOR DELIVERY 5.1
46、 Brazed parts shall be handled and packaged to ensure that the required physical characteristics and properties of the brazed parts will be preserved. 5.2 Packages of parts shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations p
47、ertaining to the handling, packaging, and transportation of the parts to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT Processor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Assemblies not bra
48、zed in accordance with this specification, or to modifications authorized by purchaser, will be subject to rejection. SAE AMS2675H Page 7 of 7 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial change
49、s, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Filler metals AMS4776, AMS4777, AMS4778, AMS4779, or AMS4782 may be specified in lieu of AMS4775 for particular applic
