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1、【精品文档】如有侵权，请联系网站删除，仅供学习与交流hfBS 4871-3-1985 按认可焊接工艺操作的焊工鉴定考试规范.第3部分金属管与管板接头间电弧焊.精品文档.BS 4871-3-1985 按认可焊接工艺操作的焊工鉴定考试规范.第3部分金属管与管板接头间电弧焊BRITISH STANDARD BS 4871-3:1985Specification forApproval testing of welders working to approved welding procedures Part 3: Arc welding of tube to tube-plate joints in

2、 metallic materialsUDC 621.791.007.2:331.108.376: 669-462:621.791.75.yang64#ff66ffBS 4871-3:1985This 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 into effect on 29 March 1985 ? BSI 12-19

3、98The following BSI references relate to the work on this standard: Committee reference WEE/36 Draft for comment 83/79157 DCISBN 0 580 14366 XCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by the Welding Standards Committee (WEE/-) to Technical

4、 Committee WEE/36, upon which the following bodies were represented:Aluminium FederationAssociated Offices Technical CommitteeAssociation of Consulting ScientistsBritish Constructional Steelwork AssociationBritish Gas CorporationBritish Railways BoardElectricity Supply Industry in England and WalesE

5、ngineering Equipment and Materials Users AssociationHeating and Ventilating Contractors AssociationMinistry of DefenceNational Coal BoardPower Generation Association (BEAMA Ltd.)Process Plant AssociationSociety of Motor Manufacturers and Traders LimitedStainless Steel Fabricators Association of Grea

6、t BritainUnited Kingdom Atomic Energy AuthorityWater-tube Boilermakers AssociationWelding InstituteWelding Manufacturers Association (BEAMA Ltd.)Coopted memberAmendments issued since publicationAmd. No. Date of issue Comments.yang6#ff66ffBS 4871-3:1985? BSI 12-1998 iContentsPageCommittees responsibl

7、e Inside front coverForeword ii1 Scope 12 Definitions 13 Information to be given to the welder 14 Items to be recorded 15 Changes not affecting approval (other than mechanized or automatic welding) 16 Extent of approval 37 Test pieces 48 Submission of test weld 49 Examination and testing 410 Stateme

8、nt of results 611 Re-approval of welder 6Appendix A Record of approval test of welder 8Figure 1 Test piece for tube ends on triangular pitch 4Figure 2 Test piece for tube ends on square pitch 5Figure 3 Typical examples of macro-examination specimens 6Table 1 Weld metal/parent metal combinations 2Tab

9、le 2 Extent of approval for weld metal groups 2Table 3 Acceptance levels 7Publications referred to Inside back cover.yang6#ff66ffBS 4871-3:1985ii ? BSI 12-1998ForewordThis Part of BS 4871 has been prepared under the direction of the Welding Standards Committee to cover the particular requirements fo

10、r the approval testing of welders for tube to tube-plate joints. While there is no limitation on the metallic materials to be used, extra considerations not covered in this standard may need to be taken into account for some materials.This Part of BS 4871 is one of a series of standards on the appro

11、val testing of welders and welding procedures, the latter having a bearing on the former for certain applications. This link has been used as a means of arranging the Parts of the standards for tube to tube-plate joints into:a) approval testing of welding procedures (see BS 4870-3);b) welder approva

12、l when approval of the welding procedure is required.It should be appreciated that the acceptance levels given in this standard are for the purposes of approval testing of welders and as such are not necessarily the same as those which might be specified for work on which approved welders will be em

13、ployed.Depending upon the emphasis placed on quality control in the production of welded components, the approval of welding procedures covered in this series of standards may be administered in one of several ways which should be stipulated at the enquiry and/or order stage. The alternatives curren

14、tly employed are the following:1) each individual contractor (or sub-contractor) may have proved by actual test pieces every weld form he wishes to use, in every thickness and material; or2) each individual contractor (or sub-contractor) may have proved by actual test pieces a set of welds represent

15、ative on a group basis of all the various thicknesses and materials to be used in production; or3) each individual contractor (or sub-contractor) need not make procedure test pieces provided he can prove by appropriate documentation of an independent nature that he has previously satisfactorily weld

16、ed the type of joint and material in question.In respect of (1) and (2) it should be appreciated that once the welding procedure tests have been approved, they need never be repeated unless there is a change in certain variables. As an extension beyond (3), it may be possible by agreement between th

17、e contracting parties for fully documented welding procedures, developed independently of the particular contractor, to be employed without the need for further approval tests.It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriat

18、ely qualified and experienced people.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 legal obligations.Summar

19、y of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, 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 fron

20、t cover.yang6#ff66ff.bzfxw#ff66ffBS 4871-3:1985? BSI 12-1998 11 ScopeThis Part of BS 4871 specifies requirements for the approval testing of welders to be engaged on the manual, semi-automatic, automatic or mechanized arc welding of those tube to tube-plate joints in metallic materials for which an

21、approved welding procedure has to be employed.The welder who successfully completes a welding procedure test in accordance with BS 4870-3 is approved to the extent given in clauses 5 and 6 of this standard without further testing.NOTE 1 This Part of BS 4871 does not cover welding processes such as e

22、xplosive welding, laser welding or electron-beam welding. The parameters to be recorded and the acceptance levels for such processes would, therefore, have to be agreed between the contracting parties, but this Part of BS 4871 may be used as the framework for such agreement.NOTE 2 The titles of the

23、publications referred to in this standard are listed on the inside back cover.2 DefinitionsFor the purposes of this Part of BS 4871, the following definitions apply.2.1 welding procedurea specific course of action followed in welding, including a list of materials and, where necessary, tools to be u

24、sed1)2.2 welding procedure testthe making and testing of a welded joint representative of that to be used in production in order to prove the feasibility of a welding procedureNOTE This term is not usually applied to any tests that may have been made during the development of a welding procedure.2.3

25、 approved welding procedurea documented welding procedure that has been approved by an inspecting authority either by means of a welding procedure test or as a result of authentic documented experience gained with the welding of joints similar to that which the welding procedure applies2.4 welder ap

26、proval testa documented test, which has been approved by an inspecting authority, carried out by a welder working to an approved welding procedure2.5 test piececomponents welded together in accordance with a specified welding procedure2.6 test specimena portion detached from a test piece and prepare

27、d as required for testing2.7 inspecting authoritythat competent independent body or association which verifies compliance with this standard3 Information to be given to the welderThe welder shall be provided with full written details according to clause 3 of BS 4870-3:1985 of the approved welding pr

28、ocedure (which may be modified as permitted by clause 5 of this standard) which he shall follow in making his test weld (see also clause 8 of this standard).For mechanized or automatic processes, the welder shall be provided with full written details and training on how to operate the equipment and

29、of the relevant checks that have to be made.4 Items to be recordedThe items given in appendix A shall be recorded for each welder approval test.NOTE Details of the welding procedure used should have been recorded previously by approval testing in accordance with BS 4870-3.5 Changes not affecting app

30、roval (other than mechanized or automatic welding)The following changes between the approved welding procedure and the procedure used for the welder approval test shall not entail re-approval of the welder for other than mechanized or automatic welding.NOTE Clause 4 of BS 4870-3:1985 states the chan

31、ges affecting an approved welding procedure, but for welder approval purposes more latitude is permitted as only the welders ability is being tested.a) A change in parent metal within one of the following ranges of steels (see also Table 1). 1) Carbon steels and low alloy steels with less than 6 % t

32、otal alloy. NOTE This range corresponds to groups A1, A2, B, C, D, E1, E2, F, G and K of Table 1 of BS 4870-3:1985.2) When high alloy ferritic weld metal is specified, a change in parent metal within the range 11 % to 20 % chromium. NOTE This range corresponds to groups M and N of Table 1 of BS 4870

33、-3:1985.1) This definition is taken from BS 499-1.yang6#ff66ff.bzfxw#ff66ffBS 4871-3:19852 ? BSI 12-19983) When austenitic or high nickel alloy weld metal is specified, a change in parent metal or combinations of parent metal within the ranges of carbon, low alloy, high alloy ferritic and austenitic

34、 steels. NOTE This range corresponds to groups A1, A2, B, C, D, E1, E2, F, G, H, J, K, L, M, N, R, S, T, U and V of Table 1 of BS 4870-3:1985.b) A change in weld metal composition within one of the groups given in Table 12) or a change within the extent of approvals given in Table 2.c) A change from

35、 either: 1) a basic to a rutile covered electrode2) for group W1 weld metal; or2) one electrode type to another2) for other than group W1 weld metal.d) A change in pre-heating temperature.e) A change in post-weld heat treatment.Table 1 Weld metal/parent metal combinationsTable 2 Extent of approval f

36、or weld metal groups2) A welder may need some period of training when changing from one electrode type to another.Weld metal Examples of British Standard designations for welding consumablesParent metal options for test jointGroup Nominal compositionW1 < 6 % total alloy BS 639: all typesa Carbon

37、or low alloy steel with less than 6 % total alloyBS 2493: all typesaexcept 7 Cr Mo B and 9 Cr Mo BBS 2901-1: all typesBS 4165: all typesW2 ? 6 % Cr ? 20 % Cr BS 2493: 7 Cr Mo B, 9 Cr Mo B Ferritic/martensitic steel within the range 11 % to 20 % chromiumferritic/martensitic steels BS 2926: 13 and 17W

38、3 Austenitic/ferritic or austenitic stainless steels in the following rangesBS 2926: all types except 13 and 17 Carbon, low alloy, high alloy ferritic or austenitic steelBS 2901-2: all typesBS 5465: all types6 to 29 % Cr5 to 22 % Ni0 to 4 % Mo0 to 1.5 % Nb0 to 1.5 % TiW4 High nickel alloy BS 2901-5:

39、 NA 35, NA 39a A change from a rutile electrode to a basic electrode requires re-approval (see item c) of clause 5).Test joint weld metal group (see Table 1)Extent of approvalW1 W2 W3 W4W1 XW2 X XW3 XW4 X XNOTE X indicates applicability.yang6#ff66ff.bzfxw#ff66ffBS 4871-3:1985? BSI 12-1998 36 Extent

40、of approval6.1 Other than mechanized or automatic welding6.1.1 Position. The approval of a welder on a test joint in one of the fundamental welding positions shall give approval for welding in the following positions:a) a test with the tube-plate in the horizontal position gives approval only for th

41、at position;b) a test with the tube-plate in the vertical position gives approval for welding with the tube-plate in the vertical or horizontal position;c) a test with the tube-plate in the overhead position gives approval for welding with the tube-plate in the overhead or horizontal position;d) a w

42、elder who has carried out tests in accordance with b) and c) is approved for any position, horizontal, vertical, overhead or any intermediate position.6.1.2 Tube pitch. The approval of a welder on a test joint using a particular pitch of tubes shall include approval for any other type or pitch provi

43、ded that the ligament dimension (see Figure 1 and Figure 2) is not reduced to below that given in the approved welding procedure.6.1.3 Cladding. Irrespective of the tube-plate thickness, when welding a clad tube-plate any reduction in nominal cladding thickness shall entail re-approval of the welder

44、.6.1.4 Thickness. For the purposes of this clause, T shall mean the nominal tube-plate thickness and t shall mean the nominal tube thickness.The approval of a welder on these thicknesses shall include approval for thicknesses in the following ranges:6.1.5 Tube diameter. For approval to weld diameter

45、s less than 19 mm, a test made on tube of nominal outside diameter D less than 19 mm shall include approval for diameters in the range D to 19 mm.For approval to weld diameters 19 mm and above, a test made on tube of nominal outside diameter D of 19 mm or above shall include approval for diameters i

46、n the range of 0.5D to 2D with a minimum nominal diameter of 19 mm.6.1.6 Type of joint. The approval of a welder on a butt weld tube end joint with added filler metal shall also include approval for butt and fillet weld joints. Separate approval shall be obtained for autogenous welding.NOTE The exac

47、t joint details, such as angles and radius, do not affect welder approval, as long as the procedure has been approved in accordance with BS 4870-3.6.1.7 More than one welder. When more than one welder is employed on making a complete test weld, the satisfactory testing of the test weld shall result in the approval of each welder for his respective portion for that particular procedure onl