BS-6787-1987 ISO-8249-1985.pdf
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1、BRITISH STANDARD BS 6787:1987 ISO 8249:1985 Method for Determination of ferrite number in austenitic weld metal deposited by covered Cr-Ni steel electrodes ISO title: Welding Determination of ferrite number in austenitic weld metal deposited by covered Cr-Ni steel electrodes UDC 621.791.053:620.179.
2、14:669.112.228.1 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 06:13:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6787:1987 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 comes
3、 into effect on 30 January 1987 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference WEE/39 Draft for comment 84/71741 DC ISBN 0 580 15661 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Wel
4、ding Standards Committee (WEE/-) to Technical Committee WEE/39, upon which the following bodies were represented: British Association for Brazing and Soldering British Railways Board British Shipbuilders British Steel Industry British Steel Industry (Wire Section) Electricity Supply Industry in Engl
5、and and Wales Engineering Equipment and Materials Users Association Process Plant Association Society of Motor Manufacturers and Traders Limited Water-tube Boilermakers Association Welding Institute Welding Manufacturers Association (BEAMA Ltd.) Coopted member Amendments issued since publication Amd
6、. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 06:13:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6787:1987 BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii 0Introduction1 1Scope1 2Field of application1 3References1 4Princ
7、iple1 5Calibration1 6Standard method for manual electrodes3 7Production welds and other measuring techniques4 8Other methods5 Annex A Procedures used to prepare secondary standards for delta ferrite in austenitic stainless steel weld metal7 Figure 1 Relationship between the tear-off forces of the st
8、andard magnet defined in 5.2 and the coating thickness standards defined in 5.12 Figure 2 Weld metal test specimen for ferrite determination5 Figure 3 Method of depositing weld metal8 Figure 4 Bead deposition and machining sequences9 Figure 5 Cutting sequences10 Figure 6 Extraction of individual sta
9、ndards11 Figure 7 Marking of each ferrite secondary standards11 Figure 8 Markings on each standard sample and identification of the five measuring points12 Table 1 Relationship between ferrite number and thickness of non-magnetic coating of coating thickness standards (specified in 5.1) for calibrat
10、ion of instruments for measurement of ferrite content through attractive force (specified in 5.3) using the standard magnet (specified in 5.2)3 Table 2 Welding parameters and deposit dimensions4 Table 3 Maximum allowable deviation in the periodic FN check6 Table 4 Welding parameters7 Table 5 Chemica
11、l compositions of seventh layer of strip clad deposits12 Table 6 NBS Standards employed for “Magne-gage” calibration13 Table 7 Example of the tabular presentation of results on the card accompanying each box of standards14 Publications referred toInside back cover Licensed Copy: sheffieldun sheffiel
12、dun, na, Tue Dec 05 06:13:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6787:1987 ii BSI 11-1999 National foreword This British Standard has been prepared under the direction of the Welding Standards Committee and is identical with ISO 8249:1985 “Welding Determination of ferrite number in austeni
13、tic weld metal deposited by Cr-Ni steel electrodes” which was prepared by Technical Committee ISO/TC 44 of the International Organization for Standardization (ISO) and in the development of which the UK played an active part. It has been assumed in the drafting of this British Standard that the exec
14、ution of its provisions is entrusted to appropriately qualified and experienced people. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identica
15、l with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to
16、 this standard, they should be read as “British Standard”. Cross-references. The Technical Committee has reviewed the provisions of ISO 525, ISO 683-13 and ISO 4954, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. The Britis
17、h Standards related to ISO 525 and ISO 683-13 are BS 4481 “Bonded abrasive products” Part 1:1981 “Specification for general features of types of abrasive wheels, blocks, honing stones, segments and profiles” and BS 1449 “Steel plate, sheet and strip” Part 2:1983 “Specification for stainless and heat
18、 resisting steel plate, sheet and strip”, respectively. A British 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 lega
19、l obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, 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 ta
20、ble on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 06:13:03 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6787:1987 BSI 11-19991 0 Introduction At present, experimental methods are not available that give an absolute measurement of the amount of ferrite in a weld m
21、etal, either destructively or non-destructively. This situation has led to the development and use, internationally, of the concept of a “ferrite number” or FN. A ferrite number is a description of the ferrite content of a weld metal determined using a standardized procedure. Such procedures are lai
22、d down in this International Standard and AWS Standard A4.2-74, these being essentially equivalent. The ferrite number of a weld metal is approximately equivalent to the percentage ferrite content, particularly at low FN values. Although other methods are available for determining the ferrite number
23、, the standardized measuring procedure, laid down in this International Standard, is based on assessing the tear-off force needed to pull the weld metal sample from a magnet of defined strength and size. The relationship between tear-off force and FN is obtained using primary standards consisting of
24、 a non-magnetic coating of specified thickness on a magnetic base. Each non-magnetic coating thickness is assigned an FN value. The ferrite content determined by this method is arbitrary and is not necessarily the true or absolute ferrite content. In recognition of this fact, the term “ferrite numbe
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