SIST EN 60974-7:2013
(Main)Arc welding equipment - Part 7:Torches
Arc welding equipment - Part 7:Torches
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, 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 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.
Lichtbogenschweißeinrichtungen -- Teil 7: Brenner
Matériel de soudage à l'arc - Partie 7: Torches
La CEI 60974-7:2013 spécifie les règles de sécurité et de construction applicables aux torches pour le soudage à l'arc et les procédés connexes. La présente partie s'applique pour les torches manuelles, guidées mécaniquement, refroidies par air, refroidies par liquide, motorisées, enroulées et avec extraction de fumée. Dans la présente partie de la CEI 60974, une torche comprend le corps de torche, le faisceau et d'autres composants. La présente partie de la CEI 60974 s'applique aussi à un faisceau qui est connecté entre une source de courant de soudage et l'équipement auxiliaire. La présente partie de la CEI 60974 ne s'applique pas aux porte-électrode pour le soudage à l'arc métallique manuel ni au coupage/gougeage air-arc. Cette troisième édition annule et remplace la seconde édition publiée en 2007 et constitue une révision technique. Les modifications principales par rapport à l'édition précédente sont listées ci-après: - nouvelle exigence pour le degré de protection du dispositif de couplage de la torche (voir Tableau 1); - domaine d'application élargi au faisceau connecté entre une source de courant et l'équipement auxiliaire (voir Article 1); - les parties de la torche, recommandées par le fabricant, sont incluses dans la conception sûre du système de coupage plasma (voir 7.4.2); - nouvelle exigence d'inflammabilité pour le matériel du manche (voir 11.3).
Naprave za obločno varjenje - 7. del: Gorilniki
Ta del IEC 60974 določa varnostne in konstrukcijske zahteve za plamena za obločno varjenje in podobne postopke. Ta del IEC 60974 se nanaša na ročna, mehansko vodena, zračno hlajena, tekočinsko hlajena, motorizirana plamena z navojem in plamena z ekstrakcijo dima. V tem delu IEC 60974 je plamen sestavljen iz telesa plamena, sestava kabelske cevi in drugih sestavnih delov. Ta del IEC 60974 se nanaša tudi na sestav kabelske cevi, priključen na vir napajanja in standardno opremo. Ta del IEC 60974 se ne nanaša na držala elektrod za ročno obločno varjenje kovine ali rezanje/dolbenje zračnega obloka.
OPOMBA 1 Tipični sorodni postopki so električno obločno rezanje in brizganje.
OPOMBA 2 Drugi sestavni deli so na seznamu v preglednici A.1.
OPOMBA 3 V tem delu IEC 60974 sta izraza »plamen« in »pištola« zamenljiva. Za lažjo uporabo je v naslednjem besedilu uporabljen izraz »plamen«.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60974-7:2013
01-julij-2013
1DGRPHãþD
SIST EN 60974-7:2005
1DSUDYH]DREORþQRYDUMHQMHGHO *RULOQLNL
Arc welding equipment - Part 7:Torches
Lichtbogenschweißeinrichtungen -- Teil 7: Brenner
Matériel de soudage à l'arc - Partie 7: Torches
Ta slovenski standard je istoveten z: EN 60974-7:2013
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-7:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60974-7:2013
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SIST EN 60974-7:2013
EUROPEAN STANDARD
EN 60974-7
NORME EUROPÉENNE
May 2013
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-7:2005
English version
Arc welding equipment -
Part 7:Torches
(IEC 60974-7:2013)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 7: Torches Teil 7: Brenner
(CEI 60974-7:2013) (IEC 60974-7:2013)
This European Standard was approved by 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 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für 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. EN 60974-7:2013 E
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SIST EN 60974-7:2013
EN 60974-7:2013 - 2 -
Foreword
The text of document 26/492/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:
(dop) 2013-11-28
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-02-28
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60974-7:2005.
EN 60974-7:2013 includes the following significant technical changes with respect to
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 cutting 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 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 Voltage 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 NOTE Harmonised as EN 60974-2.
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SIST 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 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/HD
applies.
Publication Year Title EN/HD Year
IEC 60050 Series International Electrotechnical Vocabulary - -
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60664-1 - Insulation coordination for equipment within EN 60664-1 -
low-voltage systems -
Part 1: Principles, requirements and tests
IEC 60695-11-10 - Fire hazard testing - EN 60695-11-10 -
Part 11-10: Test flames - 50 W horizontal
and vertical flame test methods
IEC 60974-1 2012 Arc welding equipment - EN 60974-1 2012
Part 1: Welding power sources
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SIST EN 60974-7:2013
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SIST EN 60974-7:2013
IEC 60974-7
®
Edition 3.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 7: Torches
Matériel de soudage à l'arc –
Partie 7: Torches
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 25.160 ISBN 978-2-83220-573-0
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 60974-7:2013
– 2 – 60974-7 IEC:2013
CONTENTS
FOREWORD . 4
1 Scope . 6
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 Protection 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 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
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 (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
11.1 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
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SIST EN 60974-7:2013
60974-7 IEC:2013 – 3 –
Annex C (informative) 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) 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 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 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 . 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
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SIST EN 60974-7:2013
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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 third edition cancels and replaces the second edition published in 2005 and constitutes a
technical revision. The significant changes with respect to the previous edition are listed
below:
• 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 cutting
system design (see 7.4.2);
• new flammability requirement for handle material (see 11.3).
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SIST EN 60974-7:2013
60974-7 IEC:2013 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/492/FDIS 26/495/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This part of IEC 60974 is to be used in conjunction with IEC 60974-1.
A list of all parts of the IEC 60974 series can be found, under the general title Arc welding
equipment, on the IEC website.
In this standard, the following print types are used:
– conformity statements: in italic type.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN 60974-7:2013
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ARC WELDING EQUIPMENT –
Part 7: Torches
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, 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
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 Normative 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) 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 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 as the following, apply.
NOTE Additional terminology is given in Annex A.
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SIST EN 60974-7:2013
60974-7 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 substantially 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 operator's hand
3.5
gas nozzle
component at the exit end of the torch directing the shielding gas around the arc and 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
current 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 operator's hand during its operation
3.11
mechanically guided 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
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SIST EN 60974-7:2013
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3.14
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
metal 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
visual 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
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 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 incorporates means to capture the welding fumes
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SIST EN 60974-7:2013
60974-7 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 the 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 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;
c) the type of cooling, see 5.4;
d) the method of striking the main arc for plasma processes, see 5.5.
5.2 Process
Torches can be designed for:
a) MIG/MAG welding;
b) self-shielded flux-cored arc welding;
c) TIG welding;
d) plasma welding;
e) submerged arc welding;
f) plasma cutting/gouging.
5.3 Guidance
Methods of torch guidance:
a) manual;
b) mechanical.
5.4 Cooling
Type of torch cooling method:
a) ambient air or shielding gas, see 3.12;
b) liquid, see 3.13.
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5.5 Main arc striking for plasma processes
Methods for striking the main arc:
a) by an arc striking voltage;
b) by a pilot arc;
c) by contact.
6 Test conditions
6.1 General
All tests shall be carried out on the same new and completely assembled torch, fitted with the
cable-hose assembly normally supplied.
All tests shall be carried out at any ambient air temperature given in Clause 4, item a).
The accuracy of measuring instruments 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 device: ± 2 K.
6.2 Type tests
All type tests given below shall be carried out on the same sample and in the following
sequence:
a) general visual inspection;
b) insulation resistance without humidity treatment (preliminary check), see 7.2;
c) impact resistance, see 11.1;
d) resistance to hot objects, see Clause 10;
e) protection against direct contact, see 7.4;
f) insulation resistance, see 7.2;
g) dielectric strength, see 7.3;
h) general visual inspection.
The heating test in accordance with 8.3 may be carried out on a separate sample and shall be
followed by the coolant leakage test in accordance with Clause 9. The other tests included in
this standard and not listed here may be carried out in any convenient sequence.
6.3 Routine tests
The following routine tests shall be carried out on each torch in the following sequence:
a) general visual inspection;
b) functional test as specified by the manufacturer, for example, leaks of fluid or gas, trigger
operation.
7 Protection against electric shock
7.1 Voltage rating
...
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