1、BRITISH STANDARDBS EN ISO 17657-5:2007Incorporating amendment no. 1 (renumbers BS ISO 17657-5:2005 as BS EN ISO 17657-5:2007)Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring systemThe European Standard EN ISO 17657-5:2007 has the
2、 status of a British StandardICS 25.160.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 17657-5:2007This British Standard was published
3、under the authority of the Standards Policy and Strategy Committee on 19 January 2006 BSI 2007ISBN 978 0 580 59706 0National forewordThis British Standard is the UK implementation of EN ISO 17657-5:2007. It is identical with ISO 17657-5:2005.The UK participation in its preparation was entrusted to T
4、echnical 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 Comments17298 31 August 2007 Renumbers BS ISO 17657-5:2005 as BS EN ISO 17657-5:2007EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 17657-5June 2007ICS 25.160.10English VersionResi
6、stance welding - Welding current measurement forresistance welding - Part 5: Verification of welding currentmeasuring system (ISO 17657-5:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 5: Vrification dessystmes de mesurage du courant de soudage (ISO17657-5:2005)W
7、iderstandsschweien - Schweistrommessung fr dasWiderstandsschweien - Teil 5: Verifizierung desSchweistrommesssystems (ISO 17657-5:2005)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
8、 giving this EuropeanStandard 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 v
9、ersions (English, 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
10、, 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 Kingdom.EUROPEAN COMMITTEE FOR STAND
11、ARDIZATIONCOMIT EUROPEN 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 17657-5:2007: EForeword The text of ISO 17657-5:200
12、5 has been prepared 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 17657-5:2007 by Technical Committee CEN/TC 121 “Welding“, 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 December 2007, and conflicting national standards shall be withdrawn at the latest by December 2007. According to the CEN/CENELEC Internal Regulations, the national standa
14、rds organizations 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, Por
15、tugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 17657-5:2005 has been approved by CEN as a EN ISO 17657-5:2007 without any modification. EN ISO 17657-5:2007Reference numberISO 17657-5:2005(E)INTERNATIONAL STANDARD ISO17657-5First
16、edition2005-09-15Resistance 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 Partie 5: Vrification des systmes de mesurage du courant de soudage EN ISO 17657-5:2007
17、ii iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 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 m
18、achine used for verification3 7 Test report 3 8 Test procedure.4 Annex A (informative) Items to be recorded or filed as reference documentation for verification 5 Annex B (informative) Test report for verification of a welding current measuring system in accordance with this part of ISO 17657.6 EN I
19、SO 17657-5:2007iv 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. Each member body interested in a sub
20、ject 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 International Electrotechnical Commission (I
21、EC) 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 Standards adopted by the technical commit
22、tees 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 subject of patent rights. ISO shall not be
23、 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 17657 consists of the following parts, under the general title Resistance welding Welding current measu
24、rement 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 17657-5:2007vIntroduction Requests for official interpreta
25、tions 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 17657-5:2007blank1Resistance welding Welding current measurement for resistance welding
26、 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 devices with current sensing coil, which are applied in measuring welding current in resistance welding using alternating current of 5
27、0 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 referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For u
28、ndated references, the latest edition of the referenced document (including any amendments) applies. ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements ISO 17657-2:2005, Resistance welding Welding current measurement for resistance welding Part 2: Welding
29、 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 definitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 test (current
30、 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 3.3 test welding current meter welding current meter to be verified 3.4 master welding current meter welding current meter that has
31、 been calibrated against a reference welding current meter EN ISO 17657-5:20072 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.
32、A typical test set-up is shown in Figure 1. The sensing coil positioning 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 el
33、ectrode position 8 fixing 9 coil B Recommended position of the 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 condi
34、tions without any adverse effect on its accuracy: at an ambient 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 spo
35、t welding work. 6 Verification requirements 6.1 Master welding 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
36、 accuracy of the master welding current measuring system shall be higher than the accuracy of the measuring system to be tested. EN ISO 17657-5:20073The master welding current measuring system shall be classified as shown in Table 1, and shall be selected depending on the required measuring accuracy
37、. 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 For checking of ordinary class Ordinary class 5,
38、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 sensing) coil The sensor position error of master c
39、urrent 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 master coil. NOTE The master coil should be se
40、t 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 machine used for verification Resistance spot,
41、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 during verification of a welding current measuring s
42、ystem 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 guarantee the measuring accuracy; c) model and type of
43、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 current 50 Hz or 60 Hz, direct current); g) time of
44、 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); EN ISO 17657-5:20074 j) read-out of the test welding current meter expressed as an r.m.s. value, in kiloamps (kA); k) deviation from the r
45、eference 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 displayed 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
46、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 procedure The measuring range of the master current meter shall be adapted to the required current level to improve the measuring accuracy. Measurements for each
47、 test sequence shall be recorded as shown in Annex B. The master welding current measuring system shall have been calibrated and certified in a laboratory 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 tes
48、t welding current meter relative to the master meter shall be measured. The deviation should be expressed as a percentage, which shall be calculated 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
49、 short circuit condition. The test shall be carried out at a measurement of three current levels including near full scale and medium current level 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. EN ISO 17657-5:20075Annex A (informative) Items to be recorded or file
