IEC 60974-7:2019

Arc welding equipment - Part 7: Torches

IEC 60974-7:2019

Name:IEC 60974-7:2019   Standard name:Arc welding equipment - Part 7: Torches
Standard number:IEC 60974-7:2019   language:English and French language
Release Date:29-Jan-2019   technical committee:TC 26 - Electric welding
Drafting committee:WG 1 - TC 26/WG 1   ICS number:01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION

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




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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

– 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

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 – T
...

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