BS EN 60974-11-2010 Arc welding equipment Electrode holders《弧焊设备 电焊钳》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationArc welding equipmentPart 11: Electrode holdersBS EN 60974-11:2010National forewordThis British Standard is the UK implementation of EN 60974-11:2010. It isidentical to IEC 60974

2、-11:2010. It supersedes BS EN 60974-11:2004 which iswithdrawn.The UK participation in its preparation was entrusted to Technical CommitteeWEE/6, Electric arc welding equipment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not p

3、urport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 63346 1ICS 25.160.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the St

4、andardsPolicy and Strategy Committee on 30 November 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60974-11:2010EUROPEAN STANDARD EN 60974-11 NORME EUROPENNE EUROPISCHE NORM October 2010 CENELEC European Committee for Electrotechnical Standardization Comit E

5、uropen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60974-11:2010 E ICS 25.160 Super

6、sedes EN 60974-11:2004English version Arc welding equipment - Part 11: Electrode holders (IEC 60974-11:2010) Matriel de soudage larc - Partie 11: Porte-lectrodes (CEI 60974-11:2010) Lichtbogenschweieinrichtungen - Teil 11: Elektrodenhalter (IEC 60974-11:2010) This European Standard was approved by C

7、ENELEC on 2010-10-01. CENELEC members are bound 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 stan

8、dards may be obtained on application to the Central Secretariat or to any CENELEC 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 CENELEC member into its own language and not

9、ified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia

10、, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 60974-11:2010 - 2 - Foreword The text of document 26/421/FDIS, future edition 3 of IEC 60974-11, prepared by IEC TC 26, Electric welding, was

11、submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60974-11 on 2010-10-01. This European Standard supersedes EN 60974-11:2004. The significant changes with respect to EN 60974-11:2004 are the following: change of the environmental condition in accordance with EN 60974-1 (se

12、e Clause 4); change of electrical measuring instruments accuracy to Class 1 (see 5.1); correction of sphere diameter to 12,5 mm (see 8.1); alternative dielectric strength test (see 8.3). This standard is to be used in conjunction with EN 60974-1. Attention is drawn to the possibility that some of th

13、e elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national st

14、andard or by endorsement (dop) 2011-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-10-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60974-11:2010 was approved by CENELEC as a European

15、Standard without any modification. _ BS EN 60974-11:2010- 3 - EN 60974-11:2010 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated r

16、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Titl

17、e EN/HD Year IEC 60050-151 - International Electrotechnical Vocabulary (IEV) - Part 151: Electrical and magnetic devices - - IEC 60529 - Degrees of protection provided by enclosures (IP Code) EN 60529 - IEC 60974-1 - Arc welding equipment - Part 1: Welding power sources EN 60974-1 - BS EN 60974-11:2

18、010 60974-11 IEC:2010 CONTENTS 1 Scope.5 2 Normative references .5 3 Terms and definitions .5 4 Environmental conditions6 5 Type tests 6 5.1 Test conditions6 5.2 Tests sequence.6 6 Designation 7 7 Operation .7 8 Protection against electric shock 7 8.1 Protection against direct contact .7 8.2 Insulat

19、ion resistance .8 8.3 Dielectric strength .8 9 Thermal rating 9 9.1 Temperature rise.9 9.2 Resistance to heat 9 9.3 Resistance to hot objects 10 10 Mechanical requirements10 10.1 Welding cable entry.10 10.2 Penetration of the welding cable insulation10 10.3 Welding cable connection11 10.4 Impact res

20、istance 11 11 Marking 12 12 Instructions for use.12 Figure 1 Arrangement for the temperature rise test 9 Figure 2 Device for testing the resistance to hot objects 10 Figure 3 Device for the pendulum swing test12 Table 1 Dimensional requirements for the electrode holder7 BS EN 60974-11:2010460974-11

21、IEC:2010 5 ARC WELDING EQUIPMENT Part 11: Electrode holders 1 Scope This part of IEC 60974 is applicable to electrode holders for manual metal arc welding with electrodes up to 10 mm in diameter. It is not applicable to electrode holders for underwater welding. This part of IEC 60974 specifies safet

22、y and performance requirements of electrode holders. 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, the latest edition of the referenced document (includin

23、g any amendments) applies. IEC 60050-151, International Electrotechnical Vocabulary Part 151: Electrical and magnetic devices IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60974-1, Arc welding equipment - Part 1: Welding power sources 3 Terms and definitions For the purpose o

24、f this document, the terms and definitions contained in IEC 60050-151 and IEC 60974-1, as well as the following apply. 3.1 electrode holder insulated tool for manual metal arc welding intended to clamp and guide the electrode and to ensure electrical connection to it 3.2 3.2 head part of the electro

25、de holder having cavities or jaws or equivalent for insertion, orientation, clamping and electrical connection of an electrode 3.3 handle part of the electrode holder designed to be held in the operators hand 3.4 lever part which may be fitted to control the clamping device of an electrode holder BS

26、 EN 60974-11:2010 6 60974-11 IEC:2010 3.5 rated current current assigned by the manufacturer that the electrode holders can accept at 60 % duty cycle without exceeding the permitted temperature rise 3.6 type A electrode holder electrode holder in which no live part is accessible to the standard test

27、 finger as described in IEC 60529 3.7 type B electrode holder electrode holder in which, deviating from type A, no live part is accessible at the head to a sphere with a diameter related to the maximum diameter of the electrode (see 8.1 b) 4 Environmental conditions Electrode holders shall be capabl

28、e of operation when the following environmental conditions prevail: a) ambient air temperature: during welding: 10 C to +40 C; b) relative humidity of the air: up to 50 % at 40 C; up to 90 % at 20 C. Electrode holders shall withstand storage and transport at an ambient air temperature of -20 C to +5

29、5 C without any damage to function and performance. 5 Type tests 5.1 Test conditions All type tests shall be carried out on the same new and completely assembled electrode holder. All type tests shall be carried out at an ambient air temperature between 10 C and 40 C. The accuracy of measuring instr

30、uments shall be: a) electrical measuring instruments: class 1; (1 % of full-scale reading, except for the measurement of insulation resistance and dielectric strength, where the accuracy of the instruments is not specified but shall be taken into account for the measurement; b) temperature measuring

31、 devices: 2 K. 5.2 Tests sequence The type tests given below shall be carried out in the following sequence: a) visual inspection; b) temperature rise, see 9.1; c) impact resistance, see 10.4; d) insulation resistance, see 8.2; e) dielectric strength, see 8.3. The other type tests in this part of IE

32、C 60974 not mentioned above may be carried out in any convenient sequence. BS EN 60974-11:201060974-11 IEC:2010 7 6 Designation Electrode holders shall be designated by the value of the rated current at 60 % duty cycle and conform to the dimensional requirements given in Table 1. Table 1 Dimensional

33、 requirements for the electrode holder Electrode holder rated current at 60 % duty cycle A Minimum clamping range for electrodes core diameter mm Minimum fitting range for welding cable cross-sectional area mm 125 1,6 to 2,5 10 to 16 150 2 to 3,2 16 to 25 200 2,5 to 4 25 to 35 250 3,2 to 5 35 to 50

34、300 4 to 6,3 50 to 70 400 5 to 8 70 to 95 500 6,3 to 10 95 to 120 NOTE If the electrode holder is intended to be used with a duty cycle of 35 % the current may be according to the next higher rated value of the cable, where the maximum current value is 600 A. Conformity shall be checked by measureme

35、nt. 7 Operation The electrode holder shall permit: a) the safe and rapid fitting of electrodes and release of stub ends; b) welding until a stub of 50 mm length with electrodes clamped in any of the set positions provided; c) the clamping of all electrode diameters as specified by the manufacturer w

36、ithout pressure being exerted by the operator; d) the electrode to be pulled off the work piece in the event of unwanted sticking to the work piece. Conformity shall be checked by operation of the clamping device, visual inspection and, in the case of item d), manual welding. 8 Protection against el

37、ectric shock 8.1 Protection against direct contact An electrode holder without an electrode, fitted with a welding supply cable of minimum cross-sectional area as specified by the manufacturer, shall be protected against unintentional contact with live parts. In the case of type A electrode holders,

38、 this requirement is also valid for the part of the electrode inserted into the electrode holder. Electrodes having the minimum and maximum diameter as specified by the manufacturer shall be tested. Conformity shall be checked by: BS EN 60974-11:2010 8 60974-11 IEC:2010 a) a standard test finger acc

39、ording to IEC 60529 in the case of electrode holders of 1) type A, and 2) type B with the exception of the head; b) a sphere in the case of the head of type B electrode holders with 1) a metal sphere of 12,5 mm diameter according to IEC 60529 for electrodes up to 6,3 mm diameter, or 2) a metal spher

40、e of 05,00+d mm diameter for electrodes thicker than 6,3 mm diameter where the value of d is twice the maximum diameter of the electrode as specified by the manufacturer. The sphere is to be applied to the opening with a force of 30 N 10 %. The springs not designed for carrying the welding current s

41、hall be insulated from other metal parts of the electrode holder. Conformity shall be checked by visual inspection. 8.2 Insulation resistance The insulation resistance shall, after the humidity treatment, be not less than 1 M. Conformity shall be checked by the following test: a) Humidity treatment

42、A humidity cabinet is maintained at a temperature t between 20 C and 30 C to within 1 K and a relative humidity between 91 % and 95 %. The electrode holder without a cable fitted is brought to a temperature between t and (t + 4) C and is then placed for 48 h in the humidity cabinet. b) Insulation re

43、sistance measurement Immediately after the humidity treatment, the electrode holder is wiped clean and tightly wrapped in metal foil, covering the external surface of the insulation. The insulation resistance is measured by application of a d.c. voltage of 500 V between the live parts and the metal

44、foil, the reading being made after stabilization of the measurement. 8.3 Dielectric strength The insulation shall withstand an a.c. test voltage of 1 000 V r.m.s. without flashover or breakdown. Any discharges unaccompanied by a voltage drop are disregarded. Conformity shall be checked by the follow

45、ing test: The a.c. test voltage shall be of an appropriate sine wave-form with a peak value not exceeding 1,45 times the r.m.s. value, having a frequency of 50 Hz or 60 Hz, applied for 1 min between the live parts and the metal foil. Alternative test: A d.c. test voltage of 1,4 times the r.m.s. test

46、 voltage may be used. BS EN 60974-11:201060974-11 IEC:2010 9 9 Thermal rating 9.1 Temperature rise The temperature rise caused by the rated current passing through the electrode holder, fitted with an untinned copper welding cable or maximum cross-sectional area and a rod with the maximum electrode

47、diameter as given in Table 1, shall not exceed 40 K at the hottest spot of the external surface of the handle. Conformity shall be checked by the following test (see Figure 1). 1 2 211 00020050 IEC 1824/10 Dimensions in millimetres Key 1 electrode holder 2 round rod Figure 1 Arrangement for the temp

48、erature rise test Two identical electrode holders are fitted each with a welding cable (at least 2 m long). The round rod of clean, unoxidized, low carbon steel is fully inserted and clamped in the two electrode holders set at 180 to each other with a distance of 50 mm between the metallic clamping

49、devices. The angle between the rod and the electrode holder may vary. The electrode holders (thus joined together) are suspended by their welding cables from two wooden laths 1 m apart, with the electrode holders in the horizontal plane. The clamped rod hangs between the two laths about 200 mm above the ground, in a draught-free area. A d.c. current equal to 75 % of the rated current (equivalent to approximately 60 % duty cycle (duty factor) is passed thro