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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 therefr
2、om, 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 2007 SAE International All rights reserved. No part of this publication may
3、 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: 724-776-4970 (outside USA) Fa
4、x: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS:http:/www.sae.org Brazing, Silver For Small Pressurized Fittings 1.SCOPE: 1.1Purpose: This specification covers the engineering requirements for producing brazed joints in parts fabricated from austenitic corrosion and heat resistant stee
5、ls, but may also be used on carbon or low-alloy steels or copper alloys, and the properties of such joints. 1.2Application: This process has been used typically for producing joints brazed between flexible metal hose, pressure fillings, pipe and tube joints, and similar parts, such as bellows and ri
6、gid end fittings where one end of the joint is not accessible for inspection, but usage is not limited to such applications. 1.3Classification: The brazing procedure is classified by the maximum service temperature as follows: Type 1600 F (316 C) service temperature Type 2400 F (204 C) service tempe
7、rature Type 3800 F (427 C) service temperature 1.3.1If a type is not specified, Type 1 shall be supplied. 1.3.2Maximum operating pressures will vary with part geometry and should be specified by purchaser. AEROSPACE MATERIAL SPECIFICATION AMS 2667F Issued1956-07 Revised2002-12 Reaffirmed2007-11 Supe
8、rseding AMS 2667E Copyright SAE International Provided by IHS under license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F - 2 - 1.4Safety - Hazardous Mate
9、rials: While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarit
10、y with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. 1.4.1Warning: Numerous scientific studies have determined that cadmium, which is used in some brazing alloys, presents a health hazard to
11、persons who are exposed to it. 2.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
12、specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply. 2.1SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS 3410Flux, Silver Brazing AMS 3411Flux, Silv
13、er Brazing, High Temperature AMS 4768Silver Alloy Brazing Filler Metal, 35Ag - 26Cu - 21Zn - 18Cd, 1125 to 1295 F (607 to 702 C) Solidus-Liquidus Range AMS 4769Silver Alloy Brazing Filler Metal, 45Ag - 24Cd - 16Zn - 15Cu, 1125 to 1145 F (607 to 618 C) Solidus-Liquidus Range AMS 4770Silver Alloy Braz
14、ing Filler Metal, 50Ag - 18Cd - 16.5Zn - 15.5Cu, 1160 to 1175 F (627 to 635 C) Solidus-Liquidus Range AMS 4771Silver Alloy Brazing Filler Metal, 50Ag - 16Cd - 15.5Zn - 15.5Cu - 3.0Ni, 1170 to 1270 F (632 to 688 C) Solidus-Liquidus Range AMS 4772Silver Alloy Brazing Filler Metal, 54Ag - 40Cu - 5.0Zn
15、- 1.0Ni, 1325 to 1575 F (718 to 857 C) Solidus-Liquidus Range AMS 4773Silver Alloy Brazing Filler Metal, 60Ag - 30Cu - 10Sn, 1115 to 1325 F (602 to 718 C), Solidus-Liquidus Range AMS 4774Silver Alloy Brazing Filler Metal, 63Ag - 28.5Cu - 6.0Sn - 2.5Ni, 1275 to 1475 F (690 to 802 C) Solidus-Liquidus
16、Range AMS 4788Silver Alloy Brazing Filler Metal, 50Ag - 28Zn - 20Cu - 2.0Ni, 1220 to 1305 F (660 to 707 C) Solidus-Liquidus Range Copyright SAE International Provided by IHS under license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 MSTNo reproducti
17、on or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F - 3 - 2.2ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM D 1179 Fluoride Ion in Water ASTM D 1193 Reagent Water 3.TECHNICAL REQUIREMENTS: 3.1Materials: 3.1.1Flux: For
18、 Types 1 and 2 brazed joints, flux shall conform to AMS 3410. For Type 3, flux shall conform to AMS 3411. Other fluxes may be used if approved by purchaser. 3.1.2Filler Metal: 3.1.2.1Type 1: Filler metal shall conform to AMS 4768 or AMS 4771. AMS 4771 shall be used for brazing austenitic corrosion a
19、nd heat resisting steels. 3.1.2.2Type 2: Filler metal shall conform to AMS 4769, AMS 4770, or AMS 4771. For austenitic corrosion resistant steels, AMS 4771 shall be used. 3.1.2.3Type 3: Filler metal shall conform to AMS 4772. 3.1.2.4For Type 1 and Type 2 processing, where purchaser specifies or perm
20、its the use of cadmium-free filler metal, AMS 4773 or AMS 4788 may be used, except that AMS 4788 shall be used for corrosion and heat resistant steels. For Type 3 processing, cadmium free AMS 4774 may be used when specified by purchaser. 3.2Preparation: The surfaces to be joined shall be clean prior
21、 to assembly. Surfaces shall not be polished. 3.3Procedure: 3.3.1Fluxing: Flux, as specified in 3.1.1, shall be applied so that the surfaces to be joined are completely coated. 3.3.1.1Flux should not be used on hose covered with wire braid or wire cloth because of the wicking action of the cloth or
22、braid and the resulting difficulty of removal. Where this is unavoidable by part design, fluxes used shall be free from chlorides and fluorides. Copyright SAE International Provided by IHS under license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 M
23、STNo reproduction or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F - 4 - 3.3.2Assembly: The parts shall be assembled so that the clearances between mating surfaces will produce optimum coverage by filler metal without appreciable running on surfaces outside the boundaries
24、 of the joint area. Optimum joint clearances for silver brazing are in the range of 0.001 to 0.004 inch (0.025 to 0.10 mm). Sufficient filler metal shall be placed within, or in close proximity to, the joint. The assembly should be supported so that the parts will be in proper alignment after brazin
25、g. 3.3.3Joining: Shall be accomplished by electrical induction, molten filler metal, or neutral flame torch heating, unless a specific method of heating is specified. The method of heating for brazing should be selected to avoid damaging previously applied supplementary coatings; e.g., hose assembli
26、es having silver plated coupling nuts should not be brazed by immersion in molten filler metal. Parts shall be heated until the filler metal melts and the joint is formed. Further heating shall be held to a minimum. Overheating shall be avoided. 3.3.4Cooling: After brazing, but prior to handling, as
27、semblies shall be cooled for sufficient time to allow the filler metal to solidify and in such a manner as to prevent cracks and minimize internal stress, distortion, and scaling. 3.3.5Flux Removal: After brazing and cooling, flux shall be removed by a method not injurious to the specified surface f
28、inish. The tests of 3.4.3 shall be used to determine that flux has been adequately removed. 3.4Properties: Brazed parts shall conform to the following requirements: 3.4.1Coverage: Visual examination of joints shall show an adequate fillet of filler metal at the end of the joint at which the filler m
29、etal was introduced. Surface and subsurface voids in the brazed joint are acceptable provided pressure and leak test requirements are met. 3.4.1.1Parts shall be visibly free from flux residue. 3.4.1.2The presence of unflowed filler metal is unacceptable. 3.4.2Tests: 3.4.2.1Proof Tests: When specifie
30、d by purchaser, any part from a lot shall pass a proof test. Where a proof test procedure is not specified, the proof pressure of production parts shall be 75% of the average burst pressure of not less than three preproduction samples or as specified by purchaser. Proof pressure testing may be done
31、pneumatically or hydrostatically at room temperature. 3.4.2.2Burst Pressure Tests: When specified by purchaser, any part from a lot shall pass a burst pressure test. The burst pressure shall be the maximum pressure sustained without noticeable leakage. Copyright SAE International Provided by IHS und
32、er license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F - 5 - 3.4.2.3Leak Tests: Any part from a lot shall sustain an internal pressure of not less than
33、90% of the proof pressure without leakage, unless another leak test pressure is specified by purchaser. Leak tests shall be done pneumatically with the assembly held under still, clear water for not less than five minutes. 3.4.3Halide Tests: Test shall be conducted on brazed assemblies to ensure tha
34、t residual halide-containing flux has been removed. If the flux is known not to contain chlorides, tests for chloride need not be made; if the flux is known not to contain fluorides, the test for fluorides need not be made. If tests indicate the presence of halides, parts shall be subjected to addit
35、ional cleaning and testing procedures until removal is complete. Test methods are not specified. Commercial chemicals are available for simple qualitative analysis for fluorides. However, in case of dispute, the following test methods shall apply. 3.4.3.1Chlorides: Rinse the test area with 40 to 50
36、mL of hot (approximately 180 F (82 C) ASTM D 1193, Type IV, water. Collect rinse water in a 100 mL beaker and add 3 to 5 drops of concentrated nitric acid (sp gr 1.42) and 2 to 3 mL of 10% silver nitrate solution. Stir the contents of the beaker and allow to stand 5 to 10 minutes. A solution as clea
37、r as a blank of ASTM D 1193, Type IV, water treated in the same manner as the rinsings indicates the absence of chlorides. A white-to-gray precipitate or turbidity indicates the presence of residual flux. 3.4.3.2Fluorides: Rinse the test area with approximately 200 mL of hot (approximately 180 F (82
38、 C) ASTM D 1193, Type IV, water. Collect the rinse water in a 250 mL beaker. Use approximately 200 mL of ASTM D 1193, Type IV, water as a comparison sample. Test both samples in accordance with ASTM D 1179. A higher concentration of fluoride in the rinse water than in the comparison sample indicates
39、 the presence of fluoride containing residual flux. 3.5Quality: 3.5.1Brazed joints shall be sound, clean, and free from foreign materials and from imperfections detrimental to usage of the brazed joints. 3.5.2Surfaces of assemblies shall be free from pitting and burning and from excessive filler met
40、al that interferes with form, fit, or function. 4.QUALITY ASSURANCE PROVISIONS: 4.1Responsibility for Inspection: The processor of brazed assemblies shall supply all samples for processors tests and shall be responsible for the performance of all required tests. Parts, if required for tests, shall b
41、e supplied by purchaser. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that processing conforms to specified requirements. 4.2Classification of Tests: 4.2.1Acceptance Tests: All technical requirements, except burst pressure tests, are accep
42、tance tests and shall be performed on each lot. Copyright SAE International Provided by IHS under license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F -
43、6 - 4.2.2Preproduction Tests: All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of brazed parts to a purchaser, when a change in material and/or processing requires approval by the cognizant engineering organization (See 4.4.2), and when pu
44、rchaser deems confirmatory testing to be required. 4.3Sampling and Testing: Shall be not less than shown in Table 1, with samples selected randomly from the lot, unless another sampling plan is specified by purchaser. A lot shall be all assemblies of the same part number, brazed by the same operator
45、 in the same shift, and presented for processors inspection at one time. 4.3.1Quality includes close visual inspection of all joints for completeness of fillet and absence of visual residual flux. 4.3.2Tests include proof pressure (3.4.2.1) and leak (3.4.2.3) tests, and, when halide-containing fluxe
46、s are used, tests for residual halides (3.4.3). 4.4Approval: 4.4.1The process and control procedures, a preproduction sample brazed part, or both, whichever is specified, shall be approved by the cognizant engineering organization before production parts are supplied. 4.4.2Processor shall make no ch
47、ange to materials, processes, or controls from those on which approval was based, unless the change is approved by the cognizant engineering organization. A significant change is one which, in the judgment of the cognizant engineering organization, could affect the properties of the parts. TABLE 1 -
48、 Sampling and Testing Parts in LotQuality (See 4.3.1)Tests (See 4.3.2) 1 to 6 7 to 15 16 to 40 41 to 110 111 to 300 301 to 500 501 to 700 701 to 1200 Over 1200 All All All All All All All All All 3 4 4 5 6 7 8 10 15 Copyright SAE International Provided by IHS under license with SAELicensee=MHI - NAGOYA related to 3944000/3944000013 Not for Resale, 01/23/2008 21:46:57 MSTNo reproduction or networking permitted without license from IHS -,-,- AMS 2667FSAEAMS 2667F - 7 - 4.4.3Control factors shall include, but are not limited to, the following: Brazing flux Braze filler metal Placement of fil