1、BSI Standards PublicationBS EN ISO 14270:2016Resistance welding Destructive testing of welds Specimen dimensions andprocedure for mechanized peeltesting resistance spot, seamand embossed projection weldsBS EN ISO 14270:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementat
2、ion of EN ISO 14270:2016. It supersedes BS EN ISO 14270:2001 which iswithdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/-/1, Briefing committee for welding.A list of organizations represented on this committee can be obtained on request to its secretary.This p
3、ublication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 82612 2 ICS 25.160.40 Compliance with a British Standard cannot confer im
4、munity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14270 March 2016 IC
5、S 25.160.40 Supersedes EN ISO 14270:2001English Version Resistance welding - Destructive testing of welds - Specimen dimensions and procedure for mechanized peel testing resistance spot, seam and embossed projection welds (ISO 14270:2016) Soudage par rsistance - Essais destructifs des soudures - Dim
6、ensions des prouvettes et mode opratoire pour lessai de pelage mcanis des soudures par rsistance par points, la molette et par bossages (ISO 14270:2016) Widerstandsschweien - Zerstrende Prfung von Schweiverbindungen - Probenmae und Verfahren fr die mechanisierte Schlprfung an Widerstandspunkt-, Roll
7、ennaht- und Buckelschweiungen mit geprgten Buckeln (ISO 14270:2016) This European Standard was approved by CEN on 13 December 2015. 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 stan
8、dard 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 member. This European Standard exists in three official versions (English, French, German). A version in a
9、ny 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. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Rep
10、ublic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEA
11、N COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14270:2016 EBS
12、EN ISO 14270:2016EN ISO 14270:2016 (E) 3 European foreword This document (EN ISO 14270:2016) has been prepared by IIW International Institute of Welding in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” the secretariat of which is held by DIN. This European Standard
13、 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2016, and conflicting national standards shall be withdrawn at the latest by September 2016. Attention is drawn to the possibility that some of the elements of
14、this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 14270:2001. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following coun
15、tries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
16、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 14270:2016 has been approved by CEN as EN ISO 14270:2016 without any modification. BS EN ISO 14270:2016ISO 14270:2016(E)Foreword ivIntroduction v1 Scope . 12 Nor
17、mative references 13 Terms and definitions . 14 Test pieces and specimens . 25 Preparation of mechanized peel test specimens 55.1 General . 55.2 Bending procedure of weld test specimens after welding 55.3 Bending procedure of test specimens before welding Alternative procedure . 55.4 Dimensions and
18、accuracy 86 Peel testing procedure and test equipment . 97 Re-test .108 Test report 10Annex A (normative) Measurement of seam weld size 12Annex B (informative) Influence of spot weld position on test results .13Annex C (informative) Examples of bending tools 14Annex D (informative) Determination of
19、the bending centre position with press brake systems .16Bibliography .17 ISO 2016 All rights reserved iiiContents PageBS EN ISO 14270:2016ISO 14270:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
20、work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-gover
21、nmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in
22、the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the po
23、ssibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list
24、 of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well
25、as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/IIW, International Institute of Welding, Commission III.This second edition cancels and rep
26、laces the first edition (ISO 14270:2000), 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 an official response.iv ISO 2016 All rig
27、hts reservedBS EN ISO 14270:2016ISO 14270:2016(E)IntroductionThis edition of ISO 14270 no longer includes figures showing failure types and modes for tensile shear and cross tension testing in accordance with ISO 14329.ISO 14270 has been revised to align it with ISO 17677-1. This edition of ISO 1427
28、0 is now applicable to testing of welds made in high strength materials including ultra-high strength materials as well as ordinary strength materials. Some of the figures related to the failure types and modes have been revised in accordance with ISO 17677-1. ISO 2016 All rights reserved vBS EN ISO
29、 14270:2016BS EN ISO 14270:2016Resistance welding Destructive testing of welds Specimen dimensions and procedure for mechanized peel testing resistance spot, seam and embossed projection welds1 ScopeThis International Standard specifies specimen dimensions and a testing procedure for mechanized peel
30、 testing of single spot, seam and embossed projection welds, in overlapping sheets, in any metallic material of thickness 0,5 mm to 3 mm, where the welds have a maximum diameter of 7t (where t is the sheet thickness in mm).For welds of diameter between 5t and 7t, the peel strength values obtained ma
31、y be lower than expected when using the recommended test specimen dimensions because the test specimen width is designed for welds of diameter of 5t or less.The object of mechanized peel testing is to determine the peel strength that the test specimen can sustain.2 Normative referencesThe following
32、documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 7500-1, Metallic m
33、aterials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring systemISO 17677-1, Resistance welding Vocabulary Part 1: Spot, projection and seam welding3 Terms and definitionsFor the purposes of this documen
34、t, the terms and definitions given in ISO 17677-1 and the following apply.3.1mechanized peel strengthMPSmaximum peel force obtained from this test3.2peel forceforce applied on test specimen during mechanized peel testing3.3minimum seam weld widthwminminimum width of the seam weld measured at the fay
35、ing surfaceNote 1 to entry: See Figure A.1.Note 2 to entry: For interface failures, the seam weld width is measured in the plane of the interface in a transverse direction to the longitudinal axis of the linear seam weld.INTERNATIONAL STANDARD ISO 14270:2016(E) ISO 2016 All rights reserved 1BS EN IS
36、O 14270:2016ISO 14270:2016(E)4 Test pieces and specimensTable 1 gives test specimen dimensions for mechanized peel tests. The positional accuracy of the weld on the test specimen shall be 1 mm or less in every direction.Table 1 Test specimen dimensions and weld positionThickness Flange length Specim
37、en width Specimen lengthFree length be-tween clampsEdge distancet a b lslfemm mm mm mm mm mm0,5 t 3,0 50 50 160 105 25NOTE See Annex B for an explanation of the influence of weld position on mechanized peel test results of spot welds.Spot welded test specimens can be produced by welding each one sep
38、arately in accordance with Figure 1 a), or making a number of individual welds joining two test plates as a multiple weld test piece, and then cutting them in accordance with Figure 2.Embossed projection weld test specimens shall only be produced by welding a single weld specimen as shown in Figure
39、1 a).In order to obtain statistically significant average results, it is recommended that several specimens are tested.In the case of unequal sheet thicknesses, the test specimen dimensions shall be based on those of the thinner sheet. Mechanized peel test specimens in accordance with Figure 1 c) sh
40、all be produced in accordance with Clause 5 or Clause 6.2 ISO 2016 All rights reservedBS EN ISO 14270:2016ISO 14270:2016(E)Dimensions in millimetresblb/2 0,5b/2 0,5sbb/2 0,51aera) Test specimen for single spot or embossed projection weldb) Test specimen for seam weldc) Mechanized peel test specimenK
41、ey1 weldFigure 1 Form of test specimen with weld position for single weldWhen using multi-spot welding equipment, each electrode shall weld an individual test specimen as shown in Figure 1 a).For multiple weld test pieces in large sheets, welding starts from an end location to the other end as shown
42、 in Figure 2. Since shunting occurs during welding of multiple weld test pieces, the welding current used shall be higher than that for welding for a single weld test specimen. For multiple weld pieces, the first and last welds shall be discarded as shown in Figure 2. ISO 2016 All rights reserved 3B
43、S EN ISO 14270:2016ISO 14270:2016(E)12bl1 2 3 N-3 N-2N-1Nsettb/2Key1 spot or embossed projection welds N number of test specimens2 cutsaDiscarded.NOTE For other symbols, see Table 1.Figure 2 Example for preparation of multiple weld test pieces3124123N-3 N-2 N-1NKey1 seam weld 4 stop position of weld
44、ing2 cuts N number of test specimens3 start of weldingaDiscarded.Figure 3 Example for preparation of seam welded test piecesFor seam welds, a continuous weld is made as shown in Figure 3. Test specimens shall be made as shown in Figure 1 b). Both end parts of the seam weld shall be discarded.4 ISO 2
45、016 All rights reservedBS EN ISO 14270:2016ISO 14270:2016(E)The properties of the welded joints in the test pieces shown in Figure 2 or Figure 3 shall not be affected by the cutting process used to separate individual test specimens.5 Preparation of mechanized peel test specimens5.1 GeneralMechanize
46、d peel test specimens can be made by the following two sequences, for peel testing using a tensile test machine.a) bending-after-welding process:Welding Bending Mechanized peel testingb) welding-after-bending process:Bending Welding Mechanized peel testingThe bending-after-welding process is only re
47、commended for thin sheet materials and/or soft materials. The bending-after-welding process can be applicable to multiple weld specimens.For high strength and/or thick materials, the welding-after-bending process is recommended using single weld test pieces.For high strength steel test specimens and
48、/or for mild steel test specimens in sheet thicknesses greater than 1,5 mm, the welding-after-bending process is strongly recommended.5.2 Bending procedure of weld test specimens after weldingSingle weld specimens as shown in Figure 1 a) or Figure 1 b) shall be bent by the method illustrated in Figu
49、re 4 to make the shape shown in Figure 1 c). When using multiple weld test pieces as shown in Figure 2 or 3, single weld specimens shall be bent after cutting them from the multiple weld test piece. The properties of the joint shall not be influenced by the bending process.An example of the welding-after-bending process is shown in C.1.5.3 Bending procedure of test specimens before welding Alternative procedureAlternatively, for single weld mechanized peel test specimens, the test spec
