1、BRITISH STANDARDBS EN ISO 17657-1:2007Incorporating amendment no. 1 (renumbers BS ISO 17657-1:2005 as BS EN ISO 17657-1:2007)Resistance welding Welding current measurement for resistance welding Part 1: Guidelines for measurementThe European Standard EN ISO 17657-1:2007 has the status of a British S
2、tandardICS 25.160.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 17657-1:2007This British Standard was published under the authority of
3、 the Standards Policy and Strategy Committee on 19 January 2006 BSI 2007ISBN 978 0 580 59703 9National forewordThis British Standard is the UK implementation of EN ISO 17657-1:2007. It is identical with ISO 17657-1:2005.The UK participation in its preparation was entrusted to Technical Committee WEE
4、/29, Resistance welding. A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard ca
5、nnot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments17295 31 August 2007 Renumbers BS ISO 17657-1:2005 as BS EN ISO 17657-1:2007EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17657-1June 2007ICS 25.160.10English VersionResistance welding - Weld
6、ing current measurement forresistance welding - Part 1: Guidelines for measurement (ISO17657-1:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 1: Lignes directrices pour lemesurage (ISO 17657-1:2005)Widerstandsschweien - Schweistrommessung fr dasWiderstandsschweie
7、n - Teil 1: Leitfaden fr die Messung(ISO 17657-1:2005)This European Standard was approved by CEN on 19 May 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alte
8、ration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by trans
9、lationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, G
10、reece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement
11、 Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17657-1:2007: EForeword The text of ISO 17657-1:2005 has been prepared by Technical Committee ISO/TC 44 “Welding and allied process
12、es” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 17657-1:2007 by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an id
13、entical text or by endorsement, at the latest by December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europea
14、n Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdo
15、m. Endorsement notice The text of ISO 17657-1:2005 has been approved by CEN as a EN ISO 17657-1:2007 without any modification. EN ISO 17657-1:2007Reference numberISO 17657-1:2005(E)INTERNATIONAL STANDARD ISO17657-1First edition2005-09-15Resistance welding Welding current measurement for resistance w
16、elding Part 1: Guidelines for measurement Soudage par rsistance Mesurage des courants en soudage par rsistance Partie 1: Lignes directrices pour le mesurage EN ISO 17657-1:2007ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Welding c
17、urrent measuring system 3 4.1 General. 3 4.2 Applicability. 3 4.3 Accuracy 3 4.4 Welding current meter with current sensing coil 4 5 Current sensors 5 5.1 Type of sensor 5 5.2 Selection of current sensor . 5 5.3 Conversion coefficient . 5 6 Tests and calibration of the welding current measuring syst
18、ems 6 7 Selection of requirements and test procedures for a welding current measuring system 6 Annex A (normative) Definition of weld times. 8 Annex B (informative) Types of integrator and equivalent current sensing coil circuits. 9 Annex C (informative) Conversion coefficient and maximum output vol
19、tage of current sensing coils 11 EN ISO 17657-1:2007iv Foreword 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.
20、 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the Interna
21、tional Electrotechnical Commission (IEC) on all matters 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 Stan
22、dards adopted by the technical committees are circulated 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 subje
23、ct of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17657-1 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding. ISO 17657 consists of the following parts, under the general title Res
24、istance welding Welding current measurement for resistance welding: Part 1: Guidelines for measurement Part 2: Welding current meter with current sensing coil Part 3: Current sensing coil Part 4: Calibration system Part 5: Verification of welding current measuring system EN ISO 17657-1:2007vIntroduc
25、tion Requests for official interpretations of any aspect of this part of ISO 17657 should be directed to the Secretariat of ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodies can be found at http:/www.iso.org. EN ISO 17657-1:2007blank1Resistance welding Welding curre
26、nt measurement for resistance welding Part 1: Guidelines for measurement 1 Scope This part of ISO 17657 specifies equipment for the calibration of measuring systems of welding current and indicating weld time in resistance welding using single-phase alternating current of frequency 50 Hz or 60 Hz, o
27、r direct current. The guidelines define various basic terms for the measurement of welding current, and give some basic information for users of welding current measuring systems including welding current meters with current sensing coil. 2 Normative references The following referenced documents are
28、 indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requ
29、irements ISO 17657-2:2005, Resistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil ISO 17657-3, Resistance welding Welding current measurement for resistance welding Part 3: Current sensing coil ISO 17657-4, Resistance welding Wel
30、ding current measurement for resistance welding Part 4: Calibration system ISO 17657-5, Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring system 3 Terms and definitions For the purposes of this document, the terms and definitions
31、given in ISO 669 and the following apply. 3.1 test technical operation that consists of the determination of one or more characteristics or performance of a given product or equipment according to a specified procedure EN ISO 17657-1:20072 3.2 verification confirmation by examination and provision o
32、f evidence that specified requirements have been met 3.3 calibration set of operations that establish, under specified conditions, the relationship between values indicated by the measuring instrument or measuring system, and the corresponding values of a measuring instrument or measuring system wit
33、h confirmed higher accuracy 3.4 welding current measuring system resistance welding measuring system that measures the welding current value and/or welding current waveform at the primary or secondary circuit of a welding transformer by using a sensing coil, non-inductive shunt or other suitable sen
34、sors 3.5 welding current meter resistance welding meter of portable type, or built into the weld controller for measuring short period current and which consists of at least a data capturing and calculating unit (e.g. integrator and accumulating unit) and a display unit 3.6 master welding current me
35、ter welding current meter calibrated against a reference welding current meter 3.7 reference welding current meter welding current meter which is sufficiently well-established to be used for the calibration of welding measuring systems or welding current meters 3.8 certified reference equipment refe
36、rence equipment which is certified by a technically valid procedure, accompanied by, or traceable to, a certificate or other documentation issued by a certifying body 3.9 current sensing coil (toroidal coil or Rogowski coil) multi-wound coils, in which wire is wound around a non-magnetic core of con
37、stant cross section, for detecting the magnetic flux generated by current 3.10 weld time time during which the welding current is applied, expressed as a number of cycles or a length of time in milliseconds NOTE Annex A gives further information on the definition of weld time. 3.11 current flow time
38、 duration defined from the start time of current conduction to the time when its current has decreased to a 10 % level of the measured welding current value, which is applied only to direct current for determination of minimum value of the hold time NOTE 1 Annex A gives further information on the de
39、finition of current flow time. NOTE 2 Current flow time is applicable only to direct current. EN ISO 17657-1:200733.12 welding current current value accumulated over the weld time and indicated by the r.m.s. value, which is applicable for alternating and direct current NOTE 1 In the case of capacito
40、r discharge current, the welding current can be indicated by the r.m.s. or the peak value. NOTE 2 Annex A in ISO 17657-2:2005 gives further information on how to calculate the welding current values. 3.13 phase control typical current control technique in resistance welding, e.g. by changing the fir
41、ing angle in each half-weld cycle of alternating current 4 Welding current measuring system 4.1 General Welding current measuring systems consist of a welding current meter, a current sensor (e.g. current sensing coil, non-inductive shunt, or any suitable sensors) and display. 4.2 Applicability The
42、welding current measuring system shall be selected based on a consideration of the following factors, in order to guarantee highly accurate measurement: type of current sensor (coil, shunt, other suitable sensors); type of welding current (alternating, direct or pulsed current); current level or cur
43、rent range; frequency of current or current waveform; location of current sensor (primary or secondary of circuit). Welding current measuring systems are classified into two types. One is used for measurement of alternating current only, which does not apply correctly to measurements of direct curre
44、nt. The other is a multi-purpose type applicable for the measurement of all current types, including continuous direct and pulsed direct current in addition to alternating current. 4.3 Accuracy The scatter in measured current value is caused by the following factors: manufacturing variations of curr
45、ent sensor and existence of distortion caused by incorrect use, or excessive repeat bending in fitting and detaching the coil; setting position of current sensor; magnetic noise affecting the connection parts of cables and connecting leads; temperature variations; design differences in the integrato
46、r/amplifier used to convert the output signal of the current sensor to a current waveform, and different calculation algorithms for welding current value in the data processing EN ISO 17657-1:20074 unit, in particular different definitions of the start time and finish time for calculation of r.m.s.
47、current values; variation of the input impedance and gain setting of the integrator if the combination of the current sensor and the integrator has been changed (when using a current sensing coil). For high accurate measurements of welding current, i.e. less than 0,5 % error, the current sensing coi
48、l shall be located in the same position as that in which it was calibrated. The welding current measuring system shall be calibrated as a set including the current sensor and integrator/amplifier in order to guarantee the accuracy. If calibration of the sensor alone is required, the input impedance
49、of the calibration system shall be the same value as the input impedance of the welding current meter. 4.4 Welding current meter with current sensing coil The welding current sensing system consists of at least a current sensing coil, an integrator, a data processing unit, and output devices for displaying or recording the welding current value and weld time. See Figure 1. The current sensing coil is used for detecting the changing magnetic flux around the welding electrode or current conductor. The
