1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationArc welding equipmentPart 7: TorchesBS EN 60974-7:2013National forewordThis British Standard is the UK implementation of EN 60974-7:2013. It isidentical to IEC 60974-7:2013. It s
2、upersedes BS EN 60974-7:2005 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 purport to inclu
3、de all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 70354 6 ICS 25.160Compliance with a British Standard cannot confer immunity from legal obligations.This Brit
4、ish Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2013.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 60974-7:2013EUROPEAN STANDARD EN 60974-7 NORME EUROPENNE EUROPISCHE NORM May 2013 CENELEC European Committee for Ele
5、ctrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No
6、. EN 60974-7:2013 E ICS 25.160 Supersedes EN 60974-7:2005 English version Arc welding equipment - Part 7:Torches (IEC 60974-7:2013) Matriel de soudage larc - Partie 7: Torches (CEI 60974-7:2013) Lichtbogenschweieinrichtungen - Teil 7: Brenner (IEC 60974-7:2013) This European Standard was approved by
7、 CENELEC on 2013-02-28. 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 st
8、andards may be obtained on application to the CEN-CENELEC Management Centre 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 lang
9、uage and notified to the CEN-CENELEC Management Centre 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, Former Yugoslav Republic of Macedonia, Fran
10、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 60974-7:2013EN 60974-7:2013 - 2 - Foreword The text of document 26/492
11、/FDIS, future edition 3 of IEC 60974-7, prepared by IEC/TC 26 “Electric welding“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60974-7:2013. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an id
12、entical national standard or by endorsement (dop) 2013-11-28 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-02-28 This document supersedes EN 60974-7:2005. EN 60974-7:2013 includes the following significant technical changes with respect to
13、EN 60974-7:2005: - new requirement for degree of protection of torch coupling device (see Table 1); - scope is extended to cable-hose assembly connected between a power source and ancillary equipment (see Clause 1); - torch parts, as recommended by the manufacturer, are included in the safe plasma c
14、utting system design (see 7.4.2); - new flammability requirement for handle material (see 11.3). This standard shall be used in conjunction with EN 60974-1:2012. In this standard, the following print types are used: - conformity statements: in italic type. Attention is drawn to the possibility that
15、some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Vol
16、tage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60974-7:2013 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated : IEC 60974-2 N
17、OTE Harmonised as EN 60974-2. BS EN 60974-7:2013- 3 - EN 60974-7:2013 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable
18、 for its application. For dated references, 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/
19、HD applies. Publication Year Title EN/HD Year IEC 60050 Series International Electrotechnical Vocabulary - - IEC 60529 - Degrees of protection provided by enclosures (IP Code) EN 60529 - IEC 60664-1 - Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements
20、 and tests EN 60664-1 - IEC 60695-11-10 - Fire hazard testing - Part 11-10: Test flames - 50 W horizontal and vertical flame test methods EN 60695-11-10 - IEC 60974-1 2012 Arc welding equipment - Part 1: Welding power sources EN 60974-1 2012 BS EN 60974-7:2013 2 60974-7 IEC:2013 CONTENTS 1 Scope . 6
21、 2 Normative references . 6 3 Terms and definitions . 6 4 Environmental conditions 9 5 Classification 9 5.1 General . 9 5.2 Process . 9 5.3 Guidance . 9 5.4 Cooling 9 5.5 Main arc striking for plasma processes 10 6 Test conditions . 10 6.1 General . 10 6.2 Type tests . 10 6.3 Routine tests . 10 7 Pr
22、otection against electric shock 10 7.1 Voltage rating 10 7.2 Insulation resistance . 11 7.3 Dielectric strength . 12 7.3.1 General requirement 12 7.3.2 Additional requirements for plasma cutting torches 12 7.3.3 Additional requirements for striking and stabilizing voltage rating 12 7.4 Protection ag
23、ainst electric shock in normal service (direct contact) . 13 7.4.1 Degree of protection requirements . 13 7.4.2 Additional requirements for plasma cutting torches 13 8 Thermal rating 13 8.1 General . 13 8.2 Temperature rise . 13 8.3 Heating test . 14 8.3.1 General . 14 8.3.2 Metal inert/active gas (
24、MIG/MAG) or self-shielded flux-cored arc welding torch . 14 8.3.3 Tungsten inert gas (TIG) and plasma arc welding torch . 16 8.3.4 Plasma cutting torch 17 8.3.5 Submerged arc welding torch 18 9 Pressure of the liquid cooling system 18 10 Resistance to hot objects . 18 11 Mechanical provisions 19 11.
25、1 Impact resistance 19 11.2 Accessible parts 20 11.3 Handle material . 20 12 Marking 20 13 Instructions for use . 21 Annex A (informative) Additional terminology . 22 Annex B (normative) Position of the welding torches for the heating test 25 BS EN 60974-7:201360974-7 IEC:2013 3 Annex C (informative
26、) Cooled copper block . 26 Annex D (informative) Copper block with a hole . 27 Annex E (informative) Copper bars with a slot 28 Bibliography 29 Figure 1 Device for testing the resistance to hot objects 19 Figure 2 Device for the impact test . 20 Figure A.1 Torch for metal inert/active gas (MIG/MAG)
27、or self-shielded flux-cored arc welding . 23 Figure A.2 Gun for metal inert/active gas (MIG/MAG) or self-shielded flux-cored arc welding . 23 Figure A.3 Torch for tungsten inert gas arc welding . 23 Figure A.4 Torch for plasma arc welding 23 Figure A.5 Torch for plasma cutting . 23 Figure A.6 Supply
28、 unit 23 Figure A.7 Mechanically guided plasma torch 24 Figure B.1 MIG/MAG torches 25 Figure B.2 TIG torches . 25 Figure B.3 Plasma welding torches 25 Figure C.1 Water-cooled copper block Example 26 Figure D.1 Water-cooled copper block with a hole Example 27 Figure E.1 Water-cooled copper bars with
29、a slot Example . 28 Table 1 Voltage rating of torches . 11 Table 2 Test values for metal inert gas arc welding (MIG) of aluminium alloys . 15 Table 3 Test values for metal active gas arc welding (MAG) of mild steel . 15 Table 4 Test values for metal active gas arc welding (MAG) with flux-cored wire
30、. 16 Table 5 Test values for self-shielded flux-cored arc welding of mild steel . 16 Table 6 Test values for tungsten inert gas arc welding (TIG) 17 Table 7 Test values for plasma arc welding 17 Table A.1 List of terms . 22 BS EN 60974-7:2013 6 60974-7 IEC:2013 ARC WELDING EQUIPMENT Part 7: Torches
31、1 Scope This part of IEC 60974 specifies safety and construction requirements for torches for arc welding and allied processes. This part of IEC 60974 is applicable to manual, mechanically guided, air-cooled, liquid-cooled, motorized, spool-on and fume extraction torches. In this part of IEC 60974,
32、a torch consists of the torch body, the cable-hose assembly and other components. This part of IEC 60974 is also applicable to a cable-hose assembly connected between a power source and ancillary equipment. This part of IEC 60974 is not applicable to electrode holders for manual metal arc welding or
33、 air-arc cutting/gouging. NOTE 1 Typical allied processes are electric arc cutting and arc spraying. NOTE 2 Other components are listed in Table A.1. NOTE 3 In this part of IEC 60974, the terms “torch“ and “gun“ are interchangeable. For convenience “torch“ has been used in the following text. 2 Norm
34、ative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
35、 applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at ) IEC 60529, Degrees of protection provided by enclosures (IP Code) IEC 60664-1, Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests IEC 60695-11-10, Fire
36、hazard testing Part 11-10: Test flames 50 W horizontal and vertical flame test methods IEC 60974-1:2012, Arc welding equipment Part 1: Welding power sources 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050, IEC 60664-1, and IEC 60974-1, as well
37、as the following, apply. NOTE Additional terminology is given in Annex A. BS EN 60974-7:201360974-7 IEC:2013 7 3.1 torch device that conveys all services necessary to the arc for welding, cutting or allied processes (for example, current, gas, coolant, wire electrode) 3.2 gun torch with a handle sub
38、stantially perpendicular to the torch body 3.3 torch body main component to which the cable-hose assembly and other components are connected 3.4 handle part designed to be held in the operators hand 3.5 gas nozzle component at the exit end of the torch directing the shielding gas around the arc and
39、over the weld pool 3.6 non-consumable electrode arc welding electrode which does not provide filler metal 3.7 wire electrode solid or tubular filler wire which conducts welding current 3.8 contact tip replaceable metal component fixed at the front end of the torch, which transfers the welding curren
40、t to, and guides, the wire electrode 3.9 cable-hose assembly flexible assembly of cables and hoses, and their connecting elements, that delivers supplies to the torch body or ancillary equipment 3.10 manual torch torch held and guided by the operators hand during its operation 3.11 mechanically guid
41、ed torch torch fixed to, and guided by, a mechanical device during its operation 3.12 air-cooled torch torch cooled by the ambient air and, where appropriate, by the shielding gas 3.13 liquid-cooled torch torch cooled by the circulation of a cooling liquid BS EN 60974-7:2013 8 60974-7 IEC:2013 3.14
42、motorized torch torch incorporating means to supply motion to the wire electrode 3.15 spool-on torch motorized torch incorporating a filler wire supply 3.16 arc striking and stabilizing voltage voltage superimposed on the welding circuit to initiate or maintain the arc or both 3.17 filler metal meta
43、l added during welding or allied processes SOURCE: IEC 60050-851:2008, 851-14-43 3.18 filler wire filler metal in solid or tubular wire form which may or may not be part of the welding circuit 3.19 plasma tip component that provides the constricting orifice through which the plasma arc passes 3.20 v
44、isual inspection inspection by eye to verify that there are no apparent discrepancies with respect to the provisions of the standard concerned SOURCE: IEC 60974-1:2012, 3.7 3.21 plasma cutting system combination of power source, torch, and associated safety devices for plasma cutting/gouging 3.22 pl
45、asma cutting power source equipment for supplying current and voltage and having the required characteristics suitable for plasma cutting/gouging and which may supply gas and cooling liquid Note 1 to entry: A plasma cutting power source may also supply services to other equipment and auxiliaries, fo
46、r example auxiliary power, cooling liquid, and gas. SOURCE: IEC 60974-1:2012, 3.55 3.23 torch coupling device part of torch connecting the cable-hose assembly to the welding equipment Note 1 to entry: A torch coupling device may include several connecting parts. 3.24 fume extraction torch torch that
47、 incorporates means to capture the welding fumes BS EN 60974-7:201360974-7 IEC:2013 9 4 Environmental conditions Torches shall be capable of operation when the following environmental conditions prevail: a) range of ambient air temperature: during operation: 10 C to +40 C; b) relative humidity of th
48、e air: up to 50 % at 40 C; up to 90 % at 20 C. Torches shall withstand storage and transport at an ambient air temperature of 20 C to +55 C without any damage to function and performance. NOTE Different environmental conditions may be agreed upon between the manufacturer and the purchaser. Examples
49、of these conditions are: high humidity, unusually corrosive fumes, steam, excessive oil vapour, abnormal vibration or shock, excessive dust, severe weather conditions, unusual coastal or shipboard conditions, vermin infestation and atmospheres conducive to the growth of mold. 5 Classification 5.1 General Torches shall be classified in accordance with: a) the process for which they are designed, see 5.2; b) the method by which they are guided, see 5.3;
