07-30164727-DC.pdf
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1、1 Latest date for receipt of comments: 31 July 2007 Project no.: 2007/00906 Responsible committee: WEE/37 Acceptance levels for welds Interested committees: Title: BS 7910 - Guide to methods for assessing the acceptability of flaws in metallic structures Amendment No 1 Supersession information: If t
2、his document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 July 2007. This draft is issued to allow comments from intereste
3、d parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Ac
4、t 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email
5、 ordersbsi- . British, International and foreign standards are also available from BSI Customer Services. British Standards on CD or Online are available from British Standards Publishing Sales Limited. Tel: 01344 404409 or email bsonlinetechindex.co.uk. Information on the co-operating organizations
6、 represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site
7、http:/www.bsi-. Direct tel: 020 8996 7120 Responsible Committee Secretary: Mrs A Hannan (BSI) E-mail: anne.hannanbsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 www.bsi- Form 36 Date: 24 April 2007 Origin: National
8、DPC: 07/30164727 DC Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:05:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 Introduction Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments a
9、re received to the contrary, this draft may be implemented unchanged as a British Standard. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be reject
10、ed. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 2003 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comme
11、nts not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site a
12、t: http:/www.bsi- Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) M B Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/N ote (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comme
13、nt submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. De
14、lete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:05:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI N:DepartmentSitgDatabs7910BS
15、7910_2005errormonitor.doc 3 24/04/07 Amendment No 1 to BS 7910:2005 Ref. Page No. Clause Current wording (or Issue) Replacement/new wording or instruction 1 vi Foreword pages 1 to 298, an inside back cover and a back cover. !pages 1 to 297, an inside back cover and a back cover. “ 2 7 Symbol Lr 7.1-
16、8, Annex M !7.1-8, Annex P“ 3 9 Symbol r Mean shell radius or radius of round bar. !Radius of round bar or bolt.“ 4 16 6.1, first and second line from top of page. Fatique x 2 !Fatigue“ 5 18 Figure 1 Move the label 1 in the 2nd sub-figure of Fig 1a) so it is against the (dashed) straight line not th
17、e (solid) curve 6 18 Figure 1, 1b) i) and ii distribtuions !distributions“ 7 18 Figure 1 1b) fatique !fatigue“ 8 21 Figure 2 e) (-km-1) Pm !-(km - 1)Pm“ 9 33 7.15.3 7488-2 !7448-2“ Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:05:17 GMT+00:00 2007, Uncontro
18、lled Copy, (c) BSI N:DepartmentSitgDatabs7910BS7910_2005errormonitor.doc 4 24/04/07 Ref. Page No. Clause Current wording (or Issue) Replacement/new wording or instruction 10 36 7.2.4.1 first paragraph 7.2.4.1 In a structure in the as-welded condition, with a flaw lying in a plane transverse to the w
19、elding direction, (i.e. the stresses to be considered are parallel to the weld) the tensile residual stress should be assumed to be a uniform membrane stress contributing to Qm. This stress should be assumed to be equal to the room temperature yield strength of the material in which the flaw is loca
20、ted. !7.2.4.1 In a structure in the as-welded condition, with a flaw lying in a plane transverse to the welding direction, (i.e. the stresses to be considered are parallel to the weld) the tensile residual stress should be assumed to be a uniform membrane stress contributing to Qm. This stress shoul
21、d be assumed to be equal to the room temperature yield strength of the material in which the flaw is located. If the flaw lies partly in weld metal and partly in parent metal, the residual stress should be assumed to be equal to the greater of the room temperature yield strengths of the weld or pare
22、nt metal.“ 11 36 7.2.4.2 Where these data are not available, it may be assumed, in carbon manganese and low alloy steels, that the stresses after heat treatment in an enclosed furnace within the range 580C to 620C (in accordance with procedures such as those of PD 5500) are as follows: - parallel to
23、 the weld, the residual stress (Qm) should be assumed to be equal to 30% of the room temperature yield strength of the material in which the flaw is located; - transverse to the weld, the residual stress (Qm) should be assumed to be 20% of the lesser of the yield strengths of the weld or parent meta
24、l. !Where these data are not available, it may be assumed, for carbon manganese and 2Cr1Mo steels, that the stresses after heat treatment in an enclosed furnace within the range 580 C to 620 C (in accordance with procedures such as those of PD 5500) are as follows: - for a flaw lying in a plane tran
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