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1、BRITISH STANDARD BS EN876:1995Destructive tests on welds in metallic materials Longitudinal tensile test on weld metal in fusion welded jointsThe European Standard EN 876:1995 has the status of aBritish StandardICS 25.160.40BS EN 876:1995Committees responsible for thisBritish StandardThe preparation
2、 of this British Standard was entrusted to Technical Committee WEE/2, Welding tests, upon which the following bodies were represented:Aluminium FederationAssociation of Consulting ScientistsBritish Constructional Steelwork Association Ltd. British Iron and Steel Producers Association Electricity Ass
3、ociationHealth and Safety Executive Institution of Structural Engineers Lloyds Register of Shipping Ministry of DefencePower Generation Contractors Association PGCA (BEAMA Ltd.)TWIWelding Manufacturers Association (BEAMA Ltd.)This British Standard, having been prepared under the direction of the Eng
4、ineering Sector Board, was published under the authority of the Standards Board and comes into effect on15 December 1995 BSI 07-1999The following BSI references relate to the work on this standard:Committee reference WEE/2Draft for comment 92/82868 DCISBN 0 580 25322 8Amd. No.DateCommentsAmendments
5、issued since publicationBS EN 876:1995ContentsPage Committees responsibleInside front cover National forewordii Foreword 2Text of EN 8763List of referencesInside back cover BSI 07-1999iBS EN 876:1995National forewordThis British Standard has been prepared by Technical Committee WEE/2 and is the Engl
6、ish language version of EN 876:1995 Destructive tests on welds in metallic materials Longitudinal tensile test on weld metal in fusion welded joints published by the European Committee for Standardization (CEN).EN 876 was produced as a result of international discussions in which theUnited Kingdom t
7、ook an active part.EN 876:1995 supersedes tests detailed in BS 709:1983 which will be amended.Cross-referencePublication referred to Corresponding British StandardEN 10002-1BS EN 10002 Tensile testing of metallic materialsPart 1:1990 Method of test at ambient temperatureA British Standard does not p
8、urport 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 pagesThis document comprises a front cover, an inside front c
9、over, pages i and ii, the EN title page, pages 2 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. BSI 07-1999iiEUROPEAN STANDARD NORME EUR
10、OPENNEEUROPISCHE NORMEN 876August 1995ICS 25.160.40Descriptors: Welding, fusion welding, welded joints, butt joints, weld metal, destructive tests, tension tests, tests specimen, dimensionsEnglish versionDestructive tests on welds in metallic materials Longitudinal tensile test on weld metal in fusi
11、on welded jointsEssais destructifs des soudures sur matriaux mtalliques Essai de traction longitudinale du mtal fondu des assemblages souds par fusionZerstrende Prfung von Schweiverbindungen an metallischen Werkstoffen Lngszugversuch an Schweigut in SchmelzschweiverbindungenThis European Standard wa
12、s approved by CEN on 1995-07-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such nationa
13、l standards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notifi
14、ed to the Central Secretariat has the same status as the official versions.CEN members are the national bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.CENEuropean
15、 Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its membersRef. No. EN 876:1995 EEN
16、 876:19955 BSI 07-1999ForewordThis European Standard has been prepared by the Technical Committee CEN/TC 121, Welding, of which the secretariat is held by DS.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the
17、latest by February 1996, and conflicting national standards shall be withdrawn at the latest by February 1996.According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland
18、, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.ContentsPageForeword21Scope32Normative reference33Principle 34Denominations and symbols35Removal of test specimens35.1Removal35.2Marking 35.3Heat treatment and/or ageing35.4Extraction 36Machini
19、ng of test specimens46.1Location46.2Dimensions46.3Surface quality47Conditions of testing48Test results 58.1General58.2Examination of fracture surfaces59Test report5Annex A (informative) Test report6Figure 1 Examples of location of testspecimens longitudinal plane section3Figure 2 Examples of locatio
20、n of testspecimens Cross section4Table A.1 Longitudinal tensile test inaccordance with EN 87661 ScopeThis standard specifies the sizes of test specimens and the test procedure for carrying out longitudinal tensile tests on cylindrical test specimens in order to determine the mechanical properties of
21、 weld metal in a fusion welded joint.This standard applies to metallic materials in all forms of product with joints made by any fusion welding process, having joint sizes that are sufficient to obtain cylindrical test specimens with dimensions in accordance with EN 10002-1.Unless otherwise specifie
22、d for specific points in this standard, the general principles of EN 10002-1 shall apply.2 Normative referenceThis European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publ
23、ications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.EN 10002-1,
24、Metallic materials Tensile testing Part 1: Method of test (at ambient temperature).3 PrincipleAn increasing tensile load is continuously applied until rupture occurs in a cylindrical test specimen taken longitudinally from the weld metal in a welded joint.Unless otherwise specified, the test shall b
25、e carried out at ambient temperature (23 5) C.4 Denominations and symbolsThe denominations and symbols to be used for the longitudinal tensile tests are specified inEN 10002-1.5 Removal of test specimens5.1 RemovalThe test specimen shall be removed longitudinally from the welded joint of the manufac
26、tured product or from the test piece. After machining, the parallel length of the test specimen shall consist only of weld metal (see Figure 1 and Figure 2).For the purpose of correctly positioning the test specimen in the joint, the joint cross-section at both ends of the test specimen can be macro
27、etched.5.2 MarkingEach test piece shall be marked to identify its exact location in the manufactured product or in the joint from which it has been removed.Each test specimen shall be marked to identify its exact location in the test piece from which it has been removed.When removed from the test pi
28、ece, each test specimen shall be marked.5.3 Heat treatment and/or ageingNo heat treatment shall be applied to the welded joint or to the test specimen unless it is specified or allowed by the relevant application standard dealing with the welded joint to be tested. Details of any heat treatment shal
29、l be recorded in the test report. If natural ageing of aluminium alloys takes place, the time between welding and testing shall be recorded.NOTE The presence of hydrogen in ferrous weld metals may adversely affect the test results and suitable hydrogen release treatment may be necessary.Figure 1 Exa
30、mples of location of test specimens longitudinal plane section5.4 Extraction5.4.1 GeneralThe mechanical or thermal processes used to extract the test specimen shall not change the properties of the test specimen in any way.5.4.2 SteelShearing is excluded for thicknesses of more than 8 mm. If thermal
31、 cutting or other cutting methods which could affect the cut surfaces are used to cut the test specimen from the welded plate, or from the test piece, the cuts shall be made at a distance greater than or equal to 8 mm from the surfaces of the final parallel length of the test specimen. Thermal cutti
32、ng shall not be used parallel to the original surface of the welded plate or of the test piece.5.4.3 Other metallic materialsShearing and thermal cutting are excluded and only machining (e.g. sawing and turning) shall be used.6 Machining of test specimens6.1 LocationUnless otherwise specified in the
33、 particular application standard dealing with the welded joint under examination, the test specimens shall be removed from the centre of the weld metal as shown in Figure 1 and the cross-section as shown in Figure 2. In the case where the test specimen is not taken from mid-thickness, the distance f
34、rom the surfaces, t1, shall be recorded (see Figure 2b). In thecase of very thick or double-sided welded joints,more than one test specimen may be removed at different locations through the thickness(see Figure 2c), in which case the distances, t1and t2, of each test specimen in the jointcross-secti
35、on shall be recorded.6.2 DimensionsEach test specimen shall have circular cross-section, and its dimensions, expressed as functions of the diameter d of the parallel length shall conform to EN 10002-1.It shall have a normal diameter d of 10 mm. If this is not possible, the diameter shall be as large
36、 as possible but not less than 4 mm. The actual size shall be recorded in the test report.The gripped ends of the test specimens shall be compatible with the tensile testing machine used.6.3 Surface qualityThe tolerances specified in EN 10002-1 shall apply. Strain-hardening or excessive heating of t
37、hematerial shall be avoided.Figure 2a All-weld metal test specimen for welding consumable classificationFigure 2b Test specimen from a joint welded from one side onlyFigure 2c Test specimen from a joint welded from both sidesFigure 2 Examples of location of test specimens Cross section7 Conditions o
38、f testingThe test specimen shall be loaded gradually and continuously in accordance with EN 10002-1.8 Test results8.1 GeneralThe test results shall be determined in accordance with EN 10002-1.8.2 Examination of fracture surfacesAfter rupture of the test specimen, the fracture surfaces shall be exami
39、ned and the existence of any imperfections that may have adversely affected the test shall be recorded, including their type, size and quantity. If fish eyes are present, they shall be recorded and only their central regions shall be considered as imperfections.9 Test reportThe test report shall inc
40、lude the following information in addition to that given in EN 10002-1: reference to this standard; location of test specimen, sketch if required(see Figure 1 and Figure 2); test temperature, if outside the ambient temperature; type and dimensions of imperfections observed; the diameter d.An example
41、 of a typical test report is given inAnnex A.Annex A (informative) Test reportTable A.1 Longitudinal tensile test in accordance with EN 876Test specimen number/positionDimension/diametermmFpNFmNRpN/mm2RmN/mm2L0mmA%Z%Test temperatureCRemark e.g. fracture appearanceBS EN 876:1995List of referencesSee
42、national foreword. BSI 07-1999BS EN876:1995BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparingBritish Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal
43、 Charter.RevisionsBritish Standards are updated by amendment or revision. Users ofBritish Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccu
44、racy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.Tel: 020 8996 9000. Fax: 020 8996 7400.BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.Buying standardsOrders f