1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 14271:2011Resistance welding Vickershardness testing (low-force andmicrohardness) of resistancespot, projection, and seamwelds (ISO 14271:2011)BS EN ISO 14271:2011Incor
2、porating corrigendum April 2012BS EN ISO 14271:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO14271:2011. It supersedes BS EN ISO 14271:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/2, Destructiv
3、e Testing of Welds.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011 ISBN 978 0 580 67478 5 ICS 25.160.40
4、Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2011.Amendments issued since publicationDate Text affectedr is the UK implementation of EN ISO 14271:
5、2011.It is identical o ISO 14271:2011, incorporating corrigendum April 2012.It supersedes BS EN ISO 14271:2001 which is withdrawn.The star and finish of ext introduced r altered by corrigendum isindicated in the text by tags. Text altered by ISO corrigendumApril 2012 is indicated in the text by .The
6、 UK participation in its preparation was entrusted to TechnicalCommittee WEE/2, Destructive Testing of Welds.A list of rganizations represented on this committee can be obtainedon request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users a
7、re responsible for its correctapplication. The British Standards Institution 2012. Publish d by BSI S andardsLimited 2012ISBN 978 0 580 79093 5ICS 25.160.40Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of theS
8、tandards Policy and Strategy Committee on 30 September 2011.Amendments/corrigenda issued since publicationDate Text affected31 July 2012 Implementation of ISO corrigendum April 2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14271 September 2011 ICS 25.160.40 Supersedes EN ISO 14271:200
9、1English Version Resistance welding - Vickers hardness testing (low-force and microhardness) of resistance spot, projection, and seam welds (ISO 14271:2011) Soudage par rsistance - Essais de duret Vickers (force rduite et microduret) sur soudures par rsistance par points, par bossages et la molette
10、(ISO 14271:2011) Widerstandsschweien - Vickers-Hrteprfung (Kleinkraft- und Mikrohrtebereich) von Widerstandspunkt-, Buckel- und Rollennahtschweiverbindungen (ISO 14271:2011) This European Standard was approved by CEN on 27 August 2011. CEN members are bound to comply with the CEN/CENELEC Internal Re
11、gulations 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 national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN me
12、mber. 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 notified to the CEN-CENELEC Management Centre has the same status as the official versions.
13、 CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloveni
14、a, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nati
15、onal Members. Ref. No. EN ISO 14271:2011: EIncorporating corrigendum April 20123 Foreword This document (EN ISO 14271:2011) has been prepared by Technical Committee ISO/TC IIW “InternationalInstitute of Welding” in collaboration with Technical Committee CEN/TC 121 “Welding” the secretariat of whichi
16、s held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by March 2012, and conflicting national standards shall be withdrawn atthe latest by March 2012. Attention is drawn to the possibility th
17、at some of the elements of this document may be the subject of patentrights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 14271:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizat
18、ions of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, CzechRepublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
19、Romania, Slovakia, Slovenia, Spain,Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 14271:2011 has been approved by CEN as a EN ISO 14271:2011 without any modification. BS EN ISO 14271:2011ISO 14271:2011(E)BS EN ISO 14271:2011ISO 14271:2011(E) ISO 2011 All rights reserv
20、ed iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for whi
21、ch a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all m
22、atters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are cir
23、culated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held respon
24、sible for identifying any or all such patent rights. ISO 14271 was prepared by the International Institute of Welding, Commission III, Resistance welding, solid state welding, and allied processes, which has been approved as an international standardizing body in the field of welding by the ISO Coun
25、cil. This second edition cancels and replaces the first edition (ISO 14271:2000), which has been technically revised. Requests for official interpretations of any aspect of this International Standard should be directed to the ISO Central Secretariat, who will forward them to the IIW Secretariat for
26、 an official response. BS EN ISO 14271:2011BS EN ISO 14271:2011INTERNATIONAL STANDARD ISO 14271:2011(E) ISO 2011 All rights reserved 1Resistance welding Vickers hardness testing (low-force and microhardness) of resistance spot, projection, and seam welds 1 Scope This International Standard specifies
27、 the procedures for the hardness testing of etched cross-sections of resistance spot, projection, and seam welds. The aim of the hardness tests is to determine the Vickers hardness, in the low-force or microhardness range, of the weld nugget, the heat affected zone, and parent material in ferrous or
28、 non-ferrous metals for welds made in sheets of thickness 0,5 mm to 6 mm. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenc
29、ed document (including any amendments) applies. ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6507-2, Metallic materials Vickers hardness test Part 2: Verification and calibration of testing machines ISO 6507-3, Metallic materials Vickers hardness test Part 3: Calibrat
30、ion of reference blocks ISO 6507-4, Metallic materials Vickers hardness test Part 4: Tables of hardness values ISO 17677-1, Resistance welding Vocabulary Part 1: Spot, projection and seam welding 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 17677-
31、1 and the following apply. 3.1 low-force hardness test Vickers hardness test using an applied force greater than or equal to 1,961 N, but less than or equal to 9,807 N 3.2 microhardness test Vickers hardness test using an applied force less than 1,961 N NOTE Vickers hardness tests in the low-force r
32、ange and Vickers microhardness tests give different results that are not easily correlated. BS EN ISO 14271:2011ISO 14271:2011(E) 2 ISO 2011 All rights reserved3.3 Vickers hardness value HV expression of hardness obtained by dividing the force applied to a Vickers indenter by the surface area of the
33、 permanent impression made by the indenter NOTE This definition is technically in accordance with ISO 23718:20071, 1.4.26. 4 Recommended forces for testing resistance welds When the low-force Vickers hardness test is used, an applied force of either 1,961 N or 9,807 N shall be used. In the case of t
34、he Vickers microhardness test, an applied force of 0,980 7 N shall be used. NOTE The test forces stipulated in ISO 6507-1 can be used when specified. 5 Test pieces and testing locations 5.1 Test pieces The test piece shall be in accordance with ISO 6507-1. 5.2 Testing locations Hardness tests shall
35、be performed on a test piece containing a cross-section taken through the weld. The thickness of the test piece shall be at least 1,5 times the diagonal length of the hardness indentation. In principle the cross-section shall lie on a plane passing through the nugget. When the electrode indentation
36、is essentially circular in a planar view, i.e. the ratio between the maximum and minimum diameter of the electrode indentation is less than 1,3, the section can be taken in any direction as shown in Figure 1. When the electrode indentation is elongated as indicated, in a planar view (e.g. some proje
37、ction welds and seam welds), the section shall be taken perpendicular to the sheet surfaces, along the longitudinal axis of the welds, as in Figures 2 and 3. With seam welds, sections can be taken transverse to, or along, the direction of welding. If specified in the application standard, supplement
38、ary cross-sections at right angles can be made. In the case of projection welds that are non-circular or non-elongated, special direction of the cross-section can be taken when specified. Etched test pieces shall be used in both cases. When determining microhardness, the weld structure shall be reve
39、aled. 6 Test equipment The testing procedure shall comply with ISO 6507-1. The testing machine shall be verified and calibrated in accordance with ISO 6507-2 and ISO 6507-3, respectively. BS EN ISO 14271:2011ISO 14271:2011(E) ISO 2011 All rights reserved 3Key 1 location of cross-section 2 electrode
40、indentation 3 weld nugget Figure 1 Recommended locations for taking sections through welds: circular weld Key 1 location of cross-section 2 electrode indentation 3 weld nugget Figure 2 Recommended locations for taking sections through welds: elongated projection weld Figure 1 Recommended location fo
41、r taking sections through welds: circular weldFigure 2 Recommended location for taking sections through welds: elongated projection weldembossmentBS EN ISO 14271:2011ISO 14271:2011(E) 4 ISO 2011 All rights reservedKey 1 location of cross-section 2 electrode indentation 3 weld nugget 4 location of lo
42、ngitudinal section Figure 3 Recommended locations for taking sections through welds: seam weld 7 Testing positions and procedure 7.1 Choice of test Low-force Vickers hardness testing range, as the test force, is recommended for the hardness test of parent material, the heat affected zone, and the we
43、ld nugget. The Vickers microhardness test range (3.2) should be used for the detection of hardness variations within these regions. 7.2 Position of the indentations for the hardness test The position of the hardness indentations in the parent material, the heat affected zone, and the weld nugget are
44、 shown in Figure 4. Two types of hardness traverses are recommended for hardness testing. The first type includes the vertical traverse and horizontal traverse(s), as shown in Figure 4 a). When the type or kind of parent materials of both sheets are not the same, or when both plate thicknesses are n
45、ot the same, the second horizontal traverse is required. The position of the hardness indentations in the parent material, the heat affected zone, and the weld nugget are shown in Figure 4. Two types of hardness traverse are recommended for hardness testing.BS EN ISO 14271:2011ISO 14271:2011(E) ISO
46、2011 All rights reserved 5The second type of hardness traverse is the oblique, as shown in Figure 4 b). The first type is recommended for the hardness traverse to keep the consistency of the legacy hardness data. The second type can be used when specified as an alternative. For the vertical and hori
47、zontal traverse type, the position of the horizontal hardness traverse shall be located within the region of t/4 to t/2, where t is the plate thickness, from the faying surface as shown in Figure 4 a) to avoid any measurements in a shrinkage cavity and/or any imperfection part of the weld nugget at
48、the faying surface. The vertical hardness traverse shall be located at or near the centre of the weld nugget. Additional measurements to those indicated can be made in particular locations, when specified. NOTE When the traverse line meets discontinuities in the nugget, the line of indentations can
49、be displaced from the original setting position. a) Hardness measurement traverse on vertical and horizontal lines b) Hardness measurement traverse on an oblique line Key 1 weld nugget 5 hardness traverse 2 heat affected zone (HAZ) t1upper plate thickness 3 parent material t2lower plate thickness 4 electrode indentation at1 t2. Figure 4 Guidelines for positioning the indentations in parent material, heat affected zone, and nugget 7.3 Testing procedure The procedure shall be carried out in accorda
