1、September 2007DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.160.10!$I50“138181
2、3www.din.deDDIN EN ISO 17657-5Resistance welding Welding current measurement for resistance welding Part 5: Verification of welding current measuring system(ISO 17657-5:2005)English version of DIN EN ISO 17657-5:2007-09Widerstandsschweien Schweistrommessung fr das Widerstandsschweien Teil 5: Verifiz
3、ierung des Schweistrommesssystems (ISO 17657-5:2005)Englische Fassung DIN EN ISO 17657-5:2007-09SupersedesDIN ISO 17657-5:2006-02www.beuth.deDocument comprises 12 pages 11.07DIN EN ISO 17657-5:2007-09 2 National foreword This standard has been prepared by Technical Committee ISO/TC 44 “Welding and a
4、llied processes”, Subcommittee SC 6 “Resistance welding” (Secretariat: DIN, Germany) and has been adopted as EN ISO 17657-5:2007 by Technical Committee CEN/TC 121 “Welding”. The responsible German body involved in its preparation was the Normenausschuss Schweitechnik (Welding Standards Committee), J
5、oint Committee NA 092-00-12 AA Widerstandsschweien (DVS AG V 3). DIN EN ISO 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
6、 Part 3: Current sensing coil Part 4: Calibration system Part 5: Verification of welding current measuring system The DIN Standard corresponding to the International Standard referred to in the EN is as follows: ISO 669 DIN ISO 669 Amendments This standard differs from DIN ISO 17657-5:2006-02 as fol
7、lows: a) The text of ISO 17657-5 has been adopted by CEN without any modification. Previous editions DIN ISO 17657-5: 2006-02 National Annex NA (informative) Bibliography DIN ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements EUROPEAN STANDARD NORME EUROP
8、ENNE EUROPISCHE NORM EN ISO 17657-5 June 2007 ICS 25.160.10 English Version Resistance welding - Welding current measurement for resistance welding - Part 5: Verification of welding current measuring system (ISO 17657-5:2005) Soudage par rsistance - Mesurage des courants en soudage par rsistance - P
9、artie 5: Vrification des systmes de mesurage du courant de soudage (ISO 17657-5:2005) Widerstandsschweien - Schweistrommessung fr das Widerstandsschweien - Teil 5: Verifizierung des Schweistrommesssystems (ISO 17657-5:2005) This European Standard was approved by CEN on 19 May 2007. CEN members are b
10、ound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the
11、 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same s
12、tatus as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Roman
13、ia, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved
14、 worldwide for CEN national Members. Ref. No. EN ISO 17657-5:2007: EContents Page 2 EN ISO 17657-5:2007 (E) Foreword .3 Introduction 4 1 Scope .5 2 Normative references .5 3 Terms and definitions 5 4 Test set-up .6 5 Physical environment and operating conditions 6 6 Verification requirements 6 6.1 M
15、aster welding current measuring system 6 6.2 Master (current sensing) coil .7 6.3 Welding machine used for verification .7 7 Test report .7 8 Test procedure.8 accordance with this part of ISO 17657 .10 Annex B (informative) Test report for verification of a welding current measuring system in Annex
16、A (informative) Items to be recorded or filed as reference documentation for verification .9 Foreword The text of ISO 17657-5:2005 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
17、EN ISO 17657-5:2007 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 identical text or by endorsement, at the latest by December 2007, and conflicting national st
18、andards 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 European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
19、France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 17657-5:2005 has been approved by CEN as EN ISO 17657
20、-5:2007 without any modifications. 3 EN ISO 17657-5:2007 (E) Introduction 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:/w
21、ww.iso.org. 4 EN ISO 17657-5:2007 (E) 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 50 Hz or 60 Hz, or wi
22、th 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 undated references, t
23、he 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 current meter with
24、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 sensing) coil curre
25、nt 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 been calibrated aga
26、inst a reference welding current meter 5 EN ISO 17657-5:2007 (E) 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
27、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 electrode positio
28、n 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 conditions without a
29、ny 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 spot welding work.
30、 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 accuracy of th
31、e master welding current measuring system shall be higher than the accuracy of the measuring system to be tested. 6 EN ISO 17657-5:2007 (E) The master welding current measuring system shall be classified as shown in Table 1, and shall be selected depending on the required measuring accuracy. Table 1
32、 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 5,0 % of fu
33、ll 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 current se
34、nsing 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 set at the
35、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, projectio
36、n 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 system inc
37、luding 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 test weld
38、ing 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 current
39、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); 7 EN ISO 17657-5:2007 (E) j) read-out of the test welding current meter expressed as an r.m.s. value, in kiloamps (kA); k) deviation from the refer
40、ence 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 accu
41、racy 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 tes
42、t 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 test we
43、lding 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 sho
44、rt 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
45、 is larger than the required measuring accuracy, the test welding current meter and the coil shall be adjusted or repaired before further use. 8 EN ISO 17657-5:2007 (E) Annex A (informative) Items to be recorded or filed as reference documentation for verification A.1 Master welding current meter Fo
46、llowing items should be recorded and filed 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 (%
47、); g) setting requirements to guarantee 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) rate
48、d conversion coefficient, in millivolts 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) sett
49、ing requirements to guarantee the accuracy; i) allowable temperature range, in degrees centigrade (C); j) manufacturers name and name of certifying test body. 9 EN ISO 17657-5:2007 (E) Annex B (informative) Test report for verification of a welding current measuring system in accordance with this part of ISO 17657 Welding current measuring system to be tested Test set-up Master current measuring system Model: Model or type: Model: Type and class: Type: Measuring current range: Power source Full scale of the
