1、BRITISH STANDARDBS EN ISO 17657-2:2007Incorporating amendment no. 1 (renumbers BS ISO 17657-2:2005 as BS EN ISO 17657-2:2007)Resistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coilThe European Standard EN ISO 17657-2:2007 has the
2、status of a British StandardICS 25.160.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 17657-2:2007This British Standard was published u
3、nder the authority of the Standards Policy and Strategy Committee on 17 January 2006 BSI 2007ISBN 978 0 580 59704 6National forewordThis British Standard is the UK implementation of EN ISO 17657-2:2007. It is identical with ISO 17657-2:2005.The UK participation in its preparation was entrusted to Te
4、chnical Committee WEE/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
5、a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date Comments17296 31 August 2007 Renumbers BS ISO 17657-2:2005 as BS EN ISO 17657-2:2007EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17657-2June 2007ICS 25.160.10English VersionResi
6、stance welding - Welding current measurement forresistance welding - Part 2: Welding current meter with currentsensing coil (ISO 17657-2:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 2: Ampremtre avec torede mesure de courant (ISO 17657-2:2005)Widerstandsschweie
7、n - Schweistrommessung fr dasWiderstandsschweien - Teil 2: Schweistrommessgertemit Strommessspule (ISO 17657-2:2005)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 Europ
8、eanStandard the status of a national standard without any alteration. 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,
9、French, German). A version in any other language made by translationunder 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
10、, 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 Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EU
11、ROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement 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 17657-2:2007: EForeword The text of ISO 17657-2:2005 has been prepare
12、d by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 17657-2:2007 by Technical Committee CEN/TC 121 “Welding“, the secretariat of which is held by DIN. This European Standard shall be given the
13、 status of a national standard, either by publication of an identical 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
14、of the following countries are bound to implement this European 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, Sl
15、ovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 17657-2:2005 has been approved by CEN as a EN ISO 17657-2:2007 without any modification. EN ISO 17657-2:2007Reference numberISO 17657-2:2005(E)INTERNATIONAL STANDARD ISO17657-2First edition2005-09-15R
16、esistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil Soudage par rsistance Mesurage des courants en soudage par rsistance Partie 2: Ampremtre avec tore de mesure de courant EN ISO 17657-2:2007ii iiiContents Page Foreword iv Intr
17、oduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Physical environment and operating conditions 2 5 Classification of welding current meters with their current sensing coil, and designation of product 2 5.1 Classes of welding current meter with current sensing coil . 2 5
18、.2 Designation of product. 3 6 Requirements for welding current meter with current sensing coil 3 6.1 Welding current meter 3 6.2 Current sensing coil . 3 6.3 Welding current meter with its current sensing coil.4 6.4 Integrator . 4 6.5 Data processing unit 4 6.6 Display unit and output ports 4 6.7 M
19、inimum and maximum duration of welding current. 4 6.8 Maximum measuring current. 5 6.9 Minimum measuring current . 5 6.10 Phase-controlled current . 5 6.11 Minimum time for current measurement 5 6.12 Fluctuation of supply voltage 5 6.13 Mechanical strength of current sensing coil . 5 6.14 Setting po
20、sition error of current sensing coil . 5 6.15 Influence of ambient temperature . 5 6.16 Test. 6 6.16.1 Type test 6 6.16.2 Acceptance test 6 7 Test procedures 6 7.1 Maximum measuring current. 6 7.2 Minimum measuring current . 6 7.3 Phase-controlled current . 7 7.4 Minimum time for current measurement
21、 7 7.5 Fluctuation of supply voltage 7 7.6 Thermal test. 8 8 Marking 8 Annex A (normative) Definition of indicated measuring time and its indicated current value 9 A.1 Indicated measuring time 9 A.2 Welding current value for the indicated measuring time . 10 Annex B (informative) Set-up of a current
22、 sensing coil and construction of welding current meters 11 EN ISO 17657-2:2007iv 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 throug
23、h 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-governmental, in liaison with ISO, also take part in the work. ISO collaborat
24、es closely with the International 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 Standard
25、s. Draft International Standards 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 thi
26、s document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17657-2 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding. ISO 17657 consists of the following parts,
27、under the general title Resistance 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 E
28、N ISO 17657-2:2007vIntroduction 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 17657-2:2007blank1Resis
29、tance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil 1 Scope This part of ISO 17657 specifies a welding current meter with a current sensing coil to measure the weld time and the r.m.s. value of the welding current during a certain
30、interval using single-phase alternating current of frequency of 50 Hz or 60 Hz, or direct current. This part of ISO 17657 is applicable for a welding current measuring system, with a display or calibrated output port, which may be connected to a welding controller. 2 Normative references The followi
31、ng 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 referenced document (including any amendments) applies. ISO 669, Resistance welding Resistance welding equipment Mec
32、hanical and electrical requirements ISO 17657-1:2005, Resistance welding Welding current measurement for resistance welding Part 1: Guidelines for measurement ISO 17657-3:2005, Resistance welding Welding current measurement for resistance welding Part 3: Current sensing coil ISO 17657-4:2005, Resist
33、ance welding Welding current measurement for resistance welding Part 4: Calibration system 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 minimum measuring time minimum settable value of the measuring time See Figure
34、 A.1. 3.2 maximum measuring time maximum settable value of the measuring time, which will depend on the types of component making up the welding current meter See Figure A.1. EN ISO 17657-2:20072 3.3 indicated measuring time duration of measuring time, from start time to finish time, while the weldi
35、ng current is flowing NOTE Normally the start and finish times for measuring current flow are automatically set. If the start time is set at zero or at a value greater than zero, and the finish time is set at a smaller value than the weld time, as shown in Figure A.1, then the welding current is cal
36、culated for the measuring duration between the start time and the finish time. 3.4 automatic zero level correction device that allows removal of the effect of zero drift of output when direct welding current measurement is incorporated 3.5 drift amount of shift in the zero position 3.6 measuring acc
37、uracy scatter limit of indicated or output values permissible, which is indicated against the full scale value 4 Physical environment and operating conditions Unless otherwise specified, the welding current meter shall be capable of operating under the following conditions without any adverse effect
38、 on its accuracy: at an ambient air temperature between of +5 C and +40 C; in relative humidity up to 95 %; at altitudes up to 1 000 m above mean sea level; where gas, fine dust, oil mist, spatters, etc. are included in the air such as those caused by ordinary arc or spot welding work. When the oper
39、ating conditions deviate from those specified above, an agreement shall be made between the manufacturer and the purchaser. 5 Classification of welding current meters with their current sensing coil, and designation of product 5.1 Classes of welding current meter with current sensing coil Welding cu
40、rrent meters with their current sensing coil are classified as in Table 1 depending on the measuring accuracy. Table 1 Classification of welding current meters with current sensing coil by measuring accuracy Classification Measuring accuracy Application Highly accurate class 1,0 % of full scale Labo
41、ratory use Accurate class 2,0 % of full scale Routine use for highly accurate systems Ordinary class 5,0 % of full scale Routine use for ordinary systems EN ISO 17657-2:200735.2 Designation of product The following shall be indicated: current type that can be measured i.e. alternating current and/or
42、 direct current; maximum current measurable; specified accuracy as a welding current meter. EXAMPLE 1 Only single-phase alternating current measurable, ordinary class, and maximum measuring current value of 15 kA. 15 kA ac class 5.0 EXAMPLE 2 Single-phase alternating current and direct current measu
43、rable, accurate class, and maximum measuring current value of 20 kA. 20 kA ac/dc class 2.0 6 Requirements for welding current meter with current sensing coil 6.1 Welding current meter The welding current meter shall consist of a data processing unit, and a display of the welding current and weld tim
44、e. An example of the construction is illustrated in Annex B. The welding current shall be indicated as at least the true r.m.s. (root-mean-square) value. The weld time should be counted on a cycle basis or the length indicated in milliseconds, calculated as the product of the length of 1 cycle and t
45、he number of cycles. Welding current meters alone (without the current sensing coil) are classified as in Table 2 depending on the measuring accuracy. Table 2 Requirements for measuring accuracy of welding current meters Classification Measuring accuracy Application Highly accurate class 0,5 % of fu
46、ll scale Laboratory use Accurate class 1,0 % of full scale Routine use for highly accurate systems Ordinary class 2,0 % of full scale Routine use for ordinary systems The scatter shall be checked against the rated value of the test welding current meter in accordance with the test procedures specifi
47、ed in ISO 17657-4. 6.2 Current sensing coil The current sensing coil shall conform to requirements described in ISO 17657-3. The conversion coefficient of the current sensing coil should coincide with requirements of the integrator built into the welding current meter, and the value of the low-induc
48、tive output resistor shall meet the requirement specified by the supplier for the current sensing coil itself. EN ISO 17657-2:20074 6.3 Welding current meter with its current sensing coil The error of the welding current meter with its coil should be adjusted together with that of the welding curren
49、t meter and its current sensing coil. If it is necessary to change the current sensing coil, the welding current measuring system shall be calibrated with a reference welding current measuring system. The error of welding current measuring system should be calculated with the sum of both error values of the welding current meter and its current sensing coil, or determined by measurements for a welding current meter with its current sensing coil. The maximum error of welding current measuring sys
