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1、BRITISH STANDARD BS ISO 17657-5:2005 Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring system ICS 25.160.10 ? Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 17657-
2、5:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 19 January 2006 BSI 19 January 2006 ISBN 0 580 47013 X National foreword This British Standard reproduces verbatim ISO 17657-5:2005 and implements it as the UK national standard. The UK p
3、articipation in its preparation was entrusted to Technical Committee WEE/29, Resistance welding, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international pu
4、blications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the
5、necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the
6、interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 6
7、, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) B
8、SI Reference number ISO 17657-5:2005(E) INTERNATIONAL STANDARD ISO 17657-5 First edition 2005-09-15 Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring system Soudage par rsistance Mesurage des courants en soudage par rsistance Part
9、ie 5: Vrification des systmes de mesurage du courant de soudage BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
10、 iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references1 3 Terms and definitions .1 4 Test set-up2 5 Physical environment and operating conditions .2 6 Verification requirements .2 6.1 Master welding current measuring system.2 6.2 Master (current sensing) coil3 6.3 Welding mac
11、hine used for verification3 7 Test report3 8 Test procedure.4 Annex A (informative) Items to be recorded or filed as reference documentation for verification5 Annex B (informative) Test report for verification of a welding current measuring system in accordance with this part of ISO 17657.6 BS ISO 1
12、7657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International
13、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-governmental, in liaison with ISO, al
14、so take part in the work. ISO collaborates 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 committ
15、ees is to prepare International Standards. 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 poss
16、ibility 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. ISO 17657-5 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 6, Resistance welding. ISO
17、 17657 consists of the following parts, 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: Verificati
18、on of welding current measuring system BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction Requests for official interpretations of any aspect of this part of ISO 17657 should be directed to the Secretariat of
19、ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodies can be found at http:/www.iso.org. BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Sun
20、Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 1 Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring system 1 Scope This part of ISO 17657 specifies a verification procedure for welding current meters and monitoring devi
21、ces with current sensing coil, which are applied in measuring welding current in resistance welding using alternating current of 50 Hz or 60 Hz, or with direct current. This verification procedure is applicable for a current range between 0,5 kA and 25 kA. 2 Normative references The following refere
22、nced 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 Mechanical a
23、nd electrical requirements ISO 17657-2:2005, Resistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil ISO 17657-4:2005, Resistance welding Welding current measurement for resistance welding Part 4: Calibration system 3 Terms and de
24、finitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 test (current sensing) coil current sensor to be verified 3.2 master (current sensing) coil current sensor known as Rogowski-type coil, calibrated against a reference current sensor 3
25、.3 test welding current meter welding current meter to be verified 3.4 master welding current meter welding current meter that has been calibrated against a reference welding current meter BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolle
26、d Copy, (c) BSI 2 4 Test set-up Test set-up for verification consists of a resistance welding machine, a master welding current meter with its coil, and a test welding current measuring system or monitoring device with coil to be tested. A typical test set-up is shown in Figure 1. The sensing coil p
27、ositioning should be in accordance with positions B, F and H in Figure 1 of ISO 17657-2:2005. Key 1 welding controller 2 master coil 3 test coil 4 master welding current meter 5 test welding current meter 6 resistance welding machine 7 electrode position 8 fixing 9 coil B Recommended position of the
28、 master coil Figure 1 A typical set-up for verification of a welding current meter 5 Physical environment and operating conditions Unless otherwise specified, the verification system shall be capable of operating under the following conditions without any adverse effect on its accuracy: at an ambien
29、t air temperature between +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. 6 Verification requirements 6.1 Master welding
30、 current measuring system The master welding current measuring system shall be calibrated by using a reference welding current measuring system at least once a year in accordance with the procedure stipulated in ISO 17657-4:2005, 8.2. The accuracy of the master welding current measuring system shall
31、 be higher than the accuracy of the measuring system to be tested. BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 3 The master welding current measuring system shall be classified as shown in Table 1, and shall be select
32、ed depending on the required measuring accuracy. Table 1 Classification of master welding current measuring system by accuracy Classification Measuring accuracy Application Highly accurate class 1,0 % of full scale For checking of accurate class or ordinary class Accurate class 2,0 % of full scale F
33、or checking of ordinary class Ordinary class 5,0 % of full scale Not to be used for checking The specification, name of certifying body and relevant date for the master welding current meter, and master current sensing coil shall be recorded on all documents, see in Annex A. 6.2 Master (current sens
34、ing) coil The sensor position error of master current sensing coil should be within 0,5 %, or the sensor/coil position should be set at the same position in which it was calibrated. If the master coil requires a fixed position to guarantee the accuracy, the calibrated position shall be marked on the
35、 master coil. NOTE The master coil should be set at the same position as the one at which it was calibrated. Position B as illustrated in Figure 1 is recommended as the setting position of master coil in order to keep the accuracy of master coil after multi-repeat setting and detaching. 6.3 Welding
36、machine used for verification Resistance spot, projection and seam welding machines as defined in ISO 669 can be used as the power sources, and should be capable of delivering a current within the range of the test welding current measuring system. 7 Test report The following shall be recorded durin
37、g verification of a welding current measuring system including monitoring devices for measuring welding current: a) model and type of master welding current meter and current sensing coil, the full scale or the measuring range and the measuring accuracy; b) sensor position of master coil to guarante
38、e the measuring accuracy; c) model and type of test welding current meter and the rated class; d) measuring range of the test meter to be tested; e) setting positions of meter and test coils (see Figure 1 of ISO 17657-2:2005); f) type and frequency of power source used for the test (alternating curr
39、ent 50 Hz or 60 Hz, direct current); g) time of current application; h) room temperature; also each measurement: i) read-out of the master welding current meter expressed as an r.m.s. value, in kiloamps (kA); BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:
40、00 2006, Uncontrolled Copy, (c) BSI 4 j) read-out of the test welding current meter expressed as an r.m.s. value, in kiloamps (kA); k) deviation from the reference value defined as the ratio between both read-outs and full scale reading of the test meter at the setting range; l) the weld time displa
41、yed on the master current meter; m) the weld time displayed on the test welding current meter; and for information: n) evaluation results of the measuring accuracy and read-out of weld time (approved or not approved); o) test date, name and signature of the testing or examining person. 8 Test proced
42、ure The measuring range of the master current meter shall be adapted to the required current level to improve the measuring accuracy. Measurements for each test sequence shall be recorded as shown in Annex B. The master welding current measuring system shall have been calibrated and certified in a l
43、aboratory or by a test body before using. The test coil shall be checked for any damage before verification. Any deviation of read-out displayed on the test welding current meter relative to the master meter shall be measured. The deviation should be expressed as a percentage, which shall be calcula
44、ted as a ratio of full scale of the test current meter at the setting range. The verification shall be carried out by using a resistance welding machine in short circuit condition. The test shall be carried out at a measurement of three current levels including near full scale and medium current lev
45、el conditions of the test current meter. The time of current application for the test should be greater than 0,1 s. If the maximum deviation of read-out values is larger than the required measuring accuracy, the test welding current meter and the coil shall be adjusted or repaired before further use
46、. BS ISO 17657-5:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 5 Annex A (informative) Items to be recorded or filed as reference documentation for verification A.1 Master welding current meter Following items should be recorded and f
47、iled as the reference documents: a) model; b) type; c) type of measuring current (alternating or direct); d) maximum measuring current, in kiloamps or amps (kA or A); e) maximum measuring time, in cycles or milliseconds (ms); f) measuring accuracy, in percent (%); g) setting requirements to guarante
48、e the accuracy; h) allowable temperature range, in degrees centigrade (C); i) manufacturers name and name of certifying test body. A.2 Master current sensing coil Following items should be recorded and filed as the reference documents: a) model; b) type; c) rated conversion coefficient, in millivolt
49、s per kiloamp (mV/kA), and the frequency, in hertz (Hz); d) measuring accuracy, in percent (%); e) frequency response, in kilohertz (kHz); f) pre-connected output load of current sensor, in ohms (); g) required input impedance of integrator, kilohms (k); h) setting requirements to guarantee the accuracy; i) allowable temperature range, in degrees centigrade (C); j) manufacturers name and name of certifying test body. BS ISO 17657-5:2005 Licensed Copy