SIST EN IEC 60974-7:2020
(Main)Arc welding equipment - Part 7:Torches (IEC 60974-7:2019)
Arc welding equipment - Part 7:Torches (IEC 60974-7:2019)
This document specifies safety and construction requirements for TORCHES used for arc welding and allied processes. This document is applicable to MANUAL, MECHANICALLY GUIDED, AIR-COOLED, LIQUID- COOLED, MOTORIZED, SPOOL-ON and FUME EXTRACTION TORCHES. In this document, a TORCH consists of the TORCH BODY, the CABLE-HOSE ASSEMBLY and other components. This document is also applicable to a CABLE-HOSE ASSEMBLY connected between a power source and ancillary equipment. This document is not applicable to electrode holders for manual metal arc welding or air-arc cutting/gouging.
Lichtbogenschweißeinrichtungen - Teil 7: Brenner (IEC 60974-7:2019)
Matériel de soudage à l'arc - Partie 7: Torches (IEC 60974-7:2019)
La présente partie de l’IEC 60974 spécifie les exigences de sécurité et de construction pour les TORCHES utilisées en soudage à l’arc et les procédés connexes. Le présent document s’applique aux TORCHES MANUELLES, GUIDÉES MÉCANIQUEMENT, REFROIDIES PAR AIR, REFROIDIES PAR LIQUIDE, MOTORISÉES, ENROULÉES et POUR EXTRACTION DE FUMEE.
Dans le présent document, une TORCHE comprend le CORPS DE TORCHE, le FAISCEAU et d’autres composants.
Le présent document s'applique aussi à un FAISCEAU qui est connecté entre une source de courant de soudage et l'équipement auxiliaire.
Le présent document ne s’applique pas aux porte-électrodes pour le soudage à l’arc métallique manuel ni au coupage/gougeage air-arc.
NOTE 1 Le coupage à l’arc électrique et la projection à l'arc électrique sont des exemples de procédés connexes typiques.
NOTE 2 D’autres composants sont énumérés dans le Tableau A.1.
NOTE 3 Dans le présent document, toutes les procédures et exigences sont identiques pour "TORCHES" et "PISTOLET". Par commodité, le terme "TORCHE" est utilisé dans le texte suivant
Oprema za obločno varjenje - 7. del: Gorilniki (IEC 60974-7:2019)
Ta dokument določa varnostne in konstrukcijske zahteve za GORILNIKE za obločno varjenje in povezane postopke. Ta dokument se uporablja za ROČNE, MEHANSKO VODENE, ZRAČNO HLAJENE, TEKOČINSKO HLAJENE, MOTORIZIRANE GORILNIKE in GORILNIKE Z NAVOJEM ALI Z EKSTRAKCIJO DIMA. V tem dokumentu je GORILNIK sestavljen iz TELESA GORILNIKA, SESTAVA KABELSKE CEVI in drugih sestavnih delov. Ta dokument se uporablja tudi za SESTAV KABELSKE CEVI, priključen na vir napajanja in pomožno opremo. Ta dokument se ne uporablja za držala elektrod za ročno obločno varjenje kovine ali rezanje/dolbenje zračnega obloka.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60974-7:2020
01-februar-2020
Nadomešča:
SIST EN 60974-7:2013
Oprema za obločno varjenje - 7. del: Gorilniki (IEC 60974-7:2019)
Arc welding equipment - Part 7:Torches (IEC 60974-7:2019)
Lichtbogenschweißeinrichtungen - Teil 7: Brenner (IEC 60974-7:2019)
Matériel de soudage à l'arc - Partie 7: Torches (IEC 60974-7:2019)
Ta slovenski standard je istoveten z: EN IEC 60974-7:2019
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN IEC 60974-7:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60974-7:2020
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SIST EN IEC 60974-7:2020
EUROPEAN STANDARD EN IEC 60974-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2019
ICS 25.160.30 Supersedes EN 60974-7:2013 and all of its amendments
and corrigenda (if any).
English Version
Arc welding equipment - Part 7: Torches
(IEC 60974-7:2019)
Matériel de soudage à l'arc - Partie 7: Torches Lichtbogenschweißeinrichtungen - Teil 7: Brenner
(IEC 60974-7:2019) (IEC 60974-7:2019)
This European Standard was approved by CENELEC on 2019-03-06. 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 standards 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 language 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60974-7:2019 E
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SIST EN IEC 60974-7:2020
EN IEC 60974-7:2019 (E)
European foreword
The text of document 26/673/FDIS, future edition 4 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 IEC 60974-7:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-05-08
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-11-08
document have to be withdrawn
This document supersedes EN 60974-7:2013 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60974-7:2019 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 NOTE Harmonized as EN 60974-2
2
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SIST EN IEC 60974-7:2020
EN IEC 60974-7:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60529 - Degrees of protection provided by enclosures (IP - -
Code)
IEC 60695-11-10 - Fire hazard testing - Part 11-10: Test flames - 50 EN 60695-11-10 -
W horizontal and vertical flame test methods
IEC 60974-1 2017 Arc welding equipment - Part 1: Welding power EN IEC 60974-1 2018
sources
Health and safety in welding and allied processes
ISO 21904-3 2018 EN ISO 21904-3 2018
- Requirements, testing and marking of equipment
for air filtration - Part 3: Determination of the
capture efficiency of on-torch welding fume
extraction devices
3
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SIST EN IEC 60974-7:2020
EN IEC 60974-7:2019 (E)
Annex ZZ
(informative)
Relationship between this European standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request relating to
harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means
of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization of the laws of the Member States relating to the
making available on the market of electrical equipment designed for use within certain voltage limits
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding safety objectives of
that Directive, and associated EFTA regulations.
Table ZZ.1 – Correspondence between this European standard and Annex I of Directive
2014/35/EU [2014 OJ L96]
Clause(s) / sub-clause(s)
Safety objectives of
Remarks / Notes
Directive 2014/35/EU
of this EN
1(a) Clauses 12, 13
1(b) Clause 13
Testing during periodic maintenance
1(c) or after repair is covered in separate
standards
2(a) Clauses 7, 13 k) and p)
Hazards arising from electric,
magnetic, and electromagnetic fields,
2(b) Clauses 7, 8 other ionizing and non-ionizing
radiation are covered in separate
standards
Clauses 6.3 b), 9, 10, 11.3, Acoustic noise is covered in separate
2(c)
13 i) 2) and n) standards
2(d) Clause 7.2, 7.3, 10
3(a) Clause 9, 10, 11
Functional safety is covered in
separate standards
3(b) Clauses 4, 11.3, 13 l) and n),
Safety-related security is covered in
separate standards
For this product type, there are no
3(c) not applicable
overload conditions.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
4
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SIST EN IEC 60974-7:2020
IEC 60974-7
®
Edition 4.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 7: Torches
Matériel de soudage à l’arc –
Partie 7: Torches
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-6500-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60974-7:2020
– 2 – IEC 60974-7:2019 © IEC 2019
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Environmental conditions . 9
5 Classification . 10
5.1 General . 10
5.2 Process . 10
5.3 Guidance . 10
5.4 Cooling . 10
5.5 Main arc striking for plasma processes . 10
6 Test conditions . 10
6.1 General . 10
6.2 Type tests . 11
6.3 Routine tests. 11
7 Protection against electric shock . 11
7.1 Voltage rating . 11
7.2 Insulation resistance . 12
7.3 Dielectric strength . 13
7.3.1 General requirement . 13
7.3.2 Additional requirements for plasma cutting TORCHES . 13
7.4 Protection against 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
7.5 Requirements for ARC STRIKING AND STABILIZING VOLTAGE rating . 14
7.5.1 General requirement . 14
7.5.2 ARC STRIKING AND STABILIZING VOLTAGE test . 14
8 Thermal rating . 15
8.1 General . 15
8.2 Temperature rise . 15
8.3 Heating test . 15
8.3.1 General . 15
8.3.2 Metal inert/active gas (MIG/MAG) or self-shielded flux-cored arc
welding TORCH . 16
8.3.3 Tungsten inert gas (TIG) and plasma arc welding TORCH . 18
8.3.4 Plasma cutting TORCH . 19
8.3.5 Submerged arc welding TORCH . 19
9 Pressure of the liquid cooling system . 20
10 Resistance to hot objects . 20
11 Mechanical provisions . 21
11.1 Impact resistance . 21
11.2 Accessible parts. 22
11.3 HANDLE material . 22
12 Marking . 22
13 Instructions for use . 22
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Annex A (informative) Additional terminology . 24
Annex B (normative) Position of the welding TORCHES for the heating test. 27
Annex C (informative) Cooled copper block . 28
Annex D (informative) Copper block with a hole . 29
Annex E (informative) Copper bars with a slot . 30
Bibliography . 31
Figure 1 – Device for testing the resistance to hot objects . 20
Figure 2 – Device for the impact test . 21
Figure A.1 – TORCH for metal inert/active gas (MIG/MAG) or self-shielded flux-cored
arc welding . 25
Figure A.2 – GUN for metal inert/active gas (MIG/MAG) or self-shielded flux-cored arc
welding . 25
Figure A.3 – TORCH for tungsten inert gas arc welding . 25
Figure A.4 – TORCH for plasma arc welding . 25
Figure A.5 – TORCH for plasma cutting . 26
Figure A.6 – Supply unit . 26
Figure A.7 – MECHANICALLY GUIDED plasma TORCH . 26
Figure B.1 – MIG/MAG TORCHES . 27
Figure B.2 – TIG TORCHES . 27
Figure B.3 – Plasma welding TORCHES . 27
Figure C.1 – Water-cooled copper block – Example . 28
Figure D.1 – Water-cooled copper block with a hole – Example . 29
Figure E.1 – Water-cooled copper bars with a slot – Example . 30
TORCHES . 12
Table 1 – Voltage rating of
Table 2 – Test values for metal inert gas arc welding (MIG) of aluminium alloys . 16
Table 3 – Test values for metal active gas arc welding (MAG) of mild steel . 17
Table 4 – Test values for metal active gas arc welding (MAG) with flux-cored wire . 17
Table 5 – Test values for self-shielded flux-cored arc welding of mild steel . 18
Table 6 – Test values for tungsten inert gas arc welding (TIG) . 18
Table 7 – Test values for plasma arc welding . 19
Table A.1 – List of terms . 24
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 7: Torches
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60974-7 has been prepared by IEC technical committee 26:
Electric welding.
This fourth edition cancels and replaces the third edition published in 2013 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) definitions 3.11 and 3.20 were revised;
b) requirements for ARC STRIKING AND STABILIZING VOLTAGE rating have been added to the
sequence of type tests (see 6.2);
c) the AC test voltage requirement for TORCHES that utilize ARC STRIKING AND STABILIZING
VOLTAGES has been revised (see 7.5.2);
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IEC 60974-7:2019 © IEC 2019 – 5 –
d) the test configuration of isolated circuits for TORCHES that utilize ARC STRIKING AND
STABILIZING VOLTAGES has been revised (see 7.5.2);
e) the metal tube used for the heating tests has additional allowable means of cooling
methods (see 8.3.2 and 8.3.5);
f) for FUME EXTRACTION TORCHES, the instructions for use include additional information
(see Clause 13, item i)).
The text of this International Standard is based on the following documents:
FDIS Report on voting
26/673/FDIS 26/678/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this standard, the following print types are used:
– conformity statements: in italic type;
– terms used throughout this standard which have been defined in clause 3: SMALL ROMAN
CAPITALS.
This document is to be used in conjunction with IEC 60974-1:2017.
A list of all parts in the IEC 60974 series, published under the general title Arc welding
equipment, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN IEC 60974-7:2020
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ARC WELDING EQUIPMENT –
Part 7: Torches
1 Scope
This part of IEC 60974 specifies safety and construction requirements for TORCHES used for
arc welding and allied processes. This document is applicable to MANUAL, MECHANICALLY
GUIDED, AIR-COOLED, LIQUID-COOLED, MOTORIZED, SPOOL-ON and FUME EXTRACTION TORCHES.
In this document, a TORCH consists of the TORCH BODY, the CABLE-HOSE ASSEMBLY and other
components.
This document is also applicable to a CABLE-HOSE ASSEMBLY connected between a power
source and ancillary equipment.
This document is not applicable to electrode holders for manual metal arc welding or 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 document, all procedures and requirements are the same for “TORCHES” and “GUNS”. For
convenience, the term "TORCH" is used in the following text.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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.
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60974-1:2017, Arc welding equipment – Part 1: Welding power sources
ISO 21904-3:2018, Health and safety in welding and allied processes – Requirements, testing
and marking of equipment for air filtration – Part 3: Determination of the capture efficiency of
on-torch welding fume extraction devices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60974-1, as well as
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
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SIST EN IEC 60974-7:2020
IEC 60974-7:2019 © IEC 2019 – 7 –
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Additional terminology is given in Annex A.
3.1
torch
device that conveys all services necessary to the arc for welding, cutting or allied processes
(for example, current, gas, coolant, ELECTRODE WIRE)
[SOURCE: IEC 60050-851:2008, 851-14-21]
3.2
gun
TORCH with a HANDLE substantially perpendicular to the TORCH BODY
[SOURCE: IEC 60050-851:2008, 851-14-22]
3.3
torch body
main component to which the CABLE-HOSE ASSEMBLY and other components are connected
[SOURCE: IEC 60050-851:2008, 851-14-29]
3.4
handle
part designed to be held in the operator's hand
[SOURCE: IEC 60050-851:2008, 851-14-28, modified – The statement “of a TORCH or an
electrode holder” after the term is deleted.]
3.5
gas nozzle
TORCH directing the shielding gas around the arc and over
component at the exit end of the
the weld pool
[SOURCE: IEC 60050-851:2008, 851-14-56]
3.6
wire electrode
solid or tubular FILLER WIRE which conducts welding current
[SOURCE: IEC 60050-851:2008, 851-14-02]
3.7
contact tip
replaceable metal component fixed at the front end of the TORCH, which transfers the welding
current to, and guides, the WIRE ELECTRODE
[SOURCE: IEC 60050-851:2008, 851-14-17]
3.8
cable-hose assembly
flexible assembly of cables and hoses, and their connecting elements, that delivers supplies
to the TORCH BODY or ancillary equipment
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[SOURCE: IEC 60050-851:2008, 851-14-34, modified – The definition is expanded to include
ancillary equipment and the word “supplies” is used instead of “all necessary services”.
3.9
manual torch
TORCH held and guided by the operator's hand during its operation
[SOURCE: IEC 60050-851:2008, 851-14-24]
3.10
mechanically guided torch
TORCH fixed to, and guided by, a mechanical device during its operation
[SOURCE: IEC 60050-851:2008, 851-14-25]
3.11
air-cooled torch
TORCH cooled by the ambient air and, where appropriate, by gas flow
3.12
liquid-cooled torch
TORCH cooled by the circulation of a cooling liquid
3.13
motorized torch
TORCH incorporating means to supply motion to the WIRE ELECTRODE
[SOURCE: IEC 60050-851:2008, 851-14-26]
3.14
spool-on torch
MOTORIZED TORCH incorporating a FILLER WIRE supply
[SOURCE: IEC 60050-851:2008, 851-14-27]
3.15
arc striking and stabilizing voltage
voltage superimposed on the welding circuit to initiate or maintain the arc or both
3.16
filler metal
metal added during welding or allied processes
[SOURCE: IEC 60050-851:2008, 851-14-43]
3.17
filler wire
FILLER METAL, in solid or tubular wire form, which may or may not be part of the welding circuit
[SOURCE: IEC 60050-851:2008, 851-14-44]
3.18
plasma tip
component that provides the constricting orifice through which the plasma arc passes
[SOURCE: IEC 60050-851:2008, 851-14-18]
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3.19
visual inspection
inspection by eye to verify that there are no apparent discrepancies with respect to the
provisions of the standard concerned
[SOURCE: IEC 60050-851:2008, 851-11-11]
3.20
plasma cutting system
combination of power source, TORCH, and associated devices for plasma cutting/gouging
[SOURCE: IEC 60050-851:2008, 851-13-03, modified – The word “safety” is deleted between
the words “associated” and “devices”.]
3.21
plasma 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,
for example auxiliary
...
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