BS 1723-1-1986钎焊.第1部分钎焊规范.pdf
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1、- - - - - - - - - - - - - - - - - BRITISH STANDARD BS 1723-1: 1986 Brazing Part 1: Specification for brazing UDC 621.791.36 BS 1723-1:1986 This British Standard, having been prepared under the direction of the Welding Standards Committee, was published under the authority of the Board of BSI and com
2、es into effect on 28 February 1986 BSI 02-1999 First published, as BS 1723, March 1951 First revision March 1963 First published, as BS 1723-1, February 1986 The following BSI references relate to the work on this standard: Committee reference WEE/19 Draft for comment 84/77328 DC ISBN 0 580 14772 X
3、Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Welding Standards Committee (WEE/-) to Technical Committee WEE/19 upon which the following bodies were represented: BNF Metals Technology Centre British Association for Brazing and Solderin
4、g British Non-Ferrous Metals Federation Electricity Supply Industry in England and Wales Heating and Ventilating Contractors Association Joint Industry Board for Plumbing Mechanical Engineering Services in England and Wales Ministry of Defence Plumbing Trades Union Society of British Aerospace Compa
5、nies Limited Welding Institute Coopted member Amendments issued since publication Amd. No.Date of issueComments BS 1723-1:1986 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope 1 2Definitions1 3Information and requirements to be agreed and to be documented1 4Paren
6、t materials 2 5Processes2 6Brazing consumables2 7Joint design2 8Joint preparation3 9Jigging3 10Brazing procedure approval3 11Quality control3 12Testing procedure3 13Acceptance criteria3 14Requirements specific to the method of brazing4 Publications referred toInside back cover BS 1723-1:1986 ii BSI
7、02-1999 Foreword This Part of BS 1723 has been prepared under the direction of the Welding Standards Committee and supersedes BS 1723:1963 which is withdrawn. BS 1723 was originally published as one standard but this revision has been divided into four Parts as follows: Part 1: Specification for bra
8、zing; Part 2: Guide to brazing; Part 3: Destructive testing and non-destructive evaluation (in preparation); Part 4: Procedure and operator approval (in preparation). This format has allowed the aspects covered in the guide (see BS 1723-2) to be widened and approvals (both procedure and operator) an
9、d methods of testing are included for the first time. This is the first revision in which metric units have been used throughout. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. A Britis
10、h Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
11、cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 1723-1:1986 BSI 02-19991 1 Scop
12、e This Part of BS 1723 specifies requirements for the brazing of joints between any parent materials that are capable of being brazed by one of the processes listed in clause 5. In addition to the definitive requirements given, it also requires the items detailed in clause 3 to be documented. For co
13、mpliance with this standard, both the definitive requirements and the separately documented requirements have to be satisfied. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purpose of this British Standard the definitions g
14、iven in BS 499-1 apply together with the following. 2.1 brazing filler metal the metal added during brazing (or pre-applied during preparation) which is to flow between the faying surfaces (see 2.2) and complete the joint 2.2 faying surfaces1) the surfaces that are to be joined in an assembly 2.3 fi
15、llet1) the meniscus formed by the brazing filler metal at a joint edge 2.4 witness evidence of brazing filler metal flow as seen at a joint edge remote from the point of application 2.5 continuous fillet a fillet with no breaks or pores visible at low magnification (up to 5) 2.6 partial fillet a fil
16、let with pores or discontinuities NOTEA specification may limit the maximum length of any allowable discontinuity or pore, individually or in total. 2.7 percentage fill the percentage of nominal joint that is filled with brazing filler metal as judged by an agreed non-destructive test method NOTESee
17、 BS 1723-32). 2.8 lap joint1) overlapping faying surfaces 2.9 butt joint1) abutting faying surfaces 2.10 preform brazing filler metal fabricated into a suitable shape for pre-placement NOTEWire, foil, plastic bonded sheet and adhesive tape are suitable for manufacturing preforms. 2.11 loading groove
18、 (pre-placement groove) a formed groove to locate pre-placed brazing filler metal 2.12 brazing gap the separation between faying surfaces at the brazing temperature 2.13 fit-up the clearance between the faying surfaces at the assembly temperature. This becomes the brazing gap at the brazing temperat
19、ure 2.14 parent material the material(s) to be joined NOTEThe expression “base metal” is to be avoided because of danger of misconception when noble metal brazing filler metals are used. 2.15 liquation the selective separation at slow heating rates of low melting temperature filler metal phases 3 In
20、formation and requirements to be agreed and to be documented 3.1 Information to be supplied by the purchaser The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout the standard and the documented items shall be satis
21、fied before a claim of compliance with the standard can be made and verified. a) The application standards to be used, if any, together with any supplementary requirements. b) Specification of the parent material. 1) This definition differs from that given in BS 499-1. 2) In preparation. BS 1723-1:1
22、986 2 BSI 02-1999 c) Types of test to be carried out on brazing filler metal. d) Whether a written brazing procedure is required (see clause 10). e) Types of tests to be carried out on brazed joints (see clause 12). 3.2 Requirements to be agreed The following items to be agreed between the contracti
23、ng parties, which are specified in the clauses referred to, shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified. a) The brazing proc
24、ess to be used (see clause 5). b) The brazing filler metal to be used in the absence of a relevant application standard see 6.1 c). c) The joint design if it is not specified in a relevant application standard see clause 7 c). d) The brazed joint category, destructive and non-destructive tests and a
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