Arc welding equipment - Part 1: Welding power sources

This part of IEC 60974 is applicable to power sources for arc welding and allied processes designed for industrial and professional use, and supplied by a voltage not exceeding 1 000 V, battery supplied or driven by mechanical means.
This document specifies safety and performance requirements of welding power sources and plasma cutting systems.
This document is not applicable to limited duty arc welding and cutting power sources which are designed mainly for use by laymen and designed in accordance with IEC 60974-6.
This document includes requirements for battery-powered welding power sources and battery packs, which are given in Annex O.
This document is not applicable to testing of power sources during periodic maintenance or after repair.
This fifth edition cancels and replaces the fourth edition published in 2012 and constitutes a technical revision.
The significant changes with respect to the previous edition are the following:
– improvement of Figure 1 (6.1.1);
– modification of Table 3 (6.1.4);
– description of energy efficiency measurements in Annex M;
– inclusion of battery supplied welding power sources in the scope. Requirements therefore are described in Annex O.

Matériel de soudage à l'arc - Partie 1: Sources de courant de soudage

La présente partie de l’IEC 60974 s'applique aux sources de courant de soudage à l'arc et aux procédés connexes conçus pour un usage industriel et professionnel qui sont alimentés sous une tension ne dépassant pas 1 000 V, alimentés par batterie ou entraînés par des moyens mécaniques.
Le présent document spécifie les exigences de sécurité et de fonctionnement des sources de courant de soudage et des systèmes de coupage par plasma.
Le présent document ne s'applique pas aux sources de courant de soudage et de coupage à l'arc à service limité qui sont utilisées essentiellement par des non professionnels et qui sont conçues selon l’IEC 60974-6.
Le présent document inclut les exigences relatives aux sources de courant de soudage alimentées par batterie et aux blocs de batteries qui sont donnés à l’Annexe O.
Le présent document ne s’applique pas aux essais des sources de courant pendant l’entretien périodique ou après réparation.
Cette cinquième édition annule et remplace la quatrième édition parue en 2012. Cette édition constitue une révision technique.
Les modifications majeures par rapport à l’édition précédente sont les suivantes:
– amélioration de la Figure 1 (6.1.1);
– modification du Tableau 3 (6.1.4);
– description des mesurages du rendement énergétique dans l’Annexe M;
– introduction des sources de courant de soudage alimentées par batterie dans le domaine d’application. Les exigences sont donc décrites dans l’Annexe O.

General Information

Status
Published
Publication Date
07-Feb-2017
Technical Committee
Current Stage
DELPUB - Deleted Publication
Completion Date
29-Jun-2021
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IEC 60974-1
Edition 5.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Arc welding equipment –
Part 1: Welding power sources
Matériel de soudage à l’arc –
Partie 1: Sources de courant de soudage
IEC 60974-1:2017-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60974-1
Edition 5.0 2017-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Arc welding equipment –
Part 1: Welding power sources
Matériel de soudage à l’arc –
Partie 1: Sources de courant de soudage
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.160.30 ISBN 978-2-8322-3854-7

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60974-1:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 9

1 Scope ............................................................................................................................ 11

2 Normative references .................................................................................................... 11

3 Terms and definitions .................................................................................................... 12

3.1 General terms ....................................................................................................... 12

3.2 Terms related to battery systems .......................................................................... 21

4 Environmental conditions ............................................................................................... 24

5 Tests ............................................................................................................................. 25

5.1 Test conditions ..................................................................................................... 25

5.2 Measuring instruments .......................................................................................... 25

5.3 Conformity of components .................................................................................... 25

5.4 Type tests ............................................................................................................. 26

5.5 Routine tests......................................................................................................... 26

6 Protection against electric shock ................................................................................... 27

6.1 Insulation .............................................................................................................. 27

6.1.1 General ......................................................................................................... 27

6.1.2 Clearances .................................................................................................... 28

6.1.3 Creepage distances ....................................................................................... 30

6.1.4 Insulation resistance ...................................................................................... 32

6.1.5 Dielectric strength .......................................................................................... 32

6.2 Protection against electric shock in normal service (direct contact) ....................... 34

6.2.1 Protection provided by the enclosure ............................................................. 34

6.2.2 Capacitors ..................................................................................................... 34

6.2.3 Automatic discharge of supply circuit capacitors ............................................ 35

6.2.4 Isolation of the welding circuit ........................................................................ 35

6.2.5 Welding circuit touch current ......................................................................... 35

6.2.6 Touch current in normal condition .................................................................. 36

6.3 Protection against electric shock in case of a fault condition (indirect contact)

............................................................................................................................. 37

6.3.1 Protective provisions ..................................................................................... 37

6.3.2 Isolation between windings of the supply circuit and the welding circuit ......... 37

6.3.3 Internal conductors and connections .............................................................. 37

6.3.4 Additional requirements for plasma cutting systems ....................................... 38

6.3.5 Movable coils and cores ................................................................................ 38

6.3.6 Touch current in fault condition ...................................................................... 38

7 Thermal requirements .................................................................................................... 39

7.1 Heating test .......................................................................................................... 39

7.1.1 Test conditions .............................................................................................. 39

7.1.2 Tolerances of the test parameters ................................................................. 39

7.1.3 Duration of test .............................................................................................. 40

7.2 Temperature measurement ................................................................................... 40

7.2.1 Measurement conditions ................................................................................ 40

7.2.2 Surface temperature sensor ........................................................................... 40

7.2.3 Resistance .................................................................................................... 40

7.2.4 Embedded temperature sensor ...................................................................... 41

7.2.5 Determination of the ambient air temperature ................................................ 41

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IEC 60974-1:2017 © IEC 2017 – 3 –

7.2.6 Recording of temperatures ............................................................................ 41

7.3 Limits of temperature rise ..................................................................................... 41

7.3.1 Windings, commutators and slip-rings ............................................................ 41

7.3.2 External surfaces ........................................................................................... 42

7.3.3 Other components ......................................................................................... 43

7.4 Loading test .......................................................................................................... 43

7.5 Commutators and slip-rings .................................................................................. 44

8 Thermal protection......................................................................................................... 44

8.1 General requirements ........................................................................................... 44

8.2 Construction ......................................................................................................... 44

8.3 Location ................................................................................................................ 44

8.4 Operating capacity ................................................................................................ 44

8.5 Operation .............................................................................................................. 45

8.6 Resetting .............................................................................................................. 45

8.7 Indication .............................................................................................................. 45

9 Abnormal operation ....................................................................................................... 45

9.1 General requirements ........................................................................................... 45

9.2 Stalled fan test ...................................................................................................... 46

9.3 Short circuit test .................................................................................................... 46

9.4 Overload test ........................................................................................................ 47

10 Connection to the supply network .................................................................................. 47

10.1 Supply voltage ...................................................................................................... 47

10.2 Multi-supply voltage .............................................................................................. 47

10.3 Means of connection to the supply circuit .............................................................. 47

10.4 Marking of terminals ............................................................................................. 48

10.5 Protective circuit ................................................................................................... 48

10.5.1 Continuity requirement ................................................................................... 48

10.5.2 Type test ....................................................................................................... 49

10.5.3 Routine test ................................................................................................... 49

10.6 Cable anchorage ................................................................................................... 50

10.7 Inlet openings ....................................................................................................... 51

10.8 Supply circuit on/off switching device .................................................................... 51

10.9 Supply cables ....................................................................................................... 52

10.10 Supply coupling device (attachment plug) ............................................................. 52

11 Output ........................................................................................................................... 53

11.1 Rated no-load voltage ........................................................................................... 53

11.1.1 Rated no-load voltage for use in environments with increased risk of

electric shock ................................................................................................ 53

11.1.2 Rated no-load voltage for use in environments without increased risk of

electric shock ................................................................................................ 53

11.1.3 Rated no-load voltage for the use with mechanically held torches with

increased protection for the operator ............................................................. 53

11.1.4 Rated no-load voltage for special processes for example plasma cutting ....... 53

11.1.5 Additional requirements ................................................................................. 54

11.1.6 Measuring circuits ......................................................................................... 55

11.2 Type test values of the conventional load voltage ................................................. 56

11.2.1 Manual metal arc welding with covered electrodes ......................................... 56

11.2.2 Tungsten inert gas ......................................................................................... 56

11.2.3 Metal inert/active gas and flux cored arc welding ........................................... 56

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– 4 – IEC 60974-1:2017 © IEC 2017

11.2.4 Submerged arc welding ................................................................................. 56

11.2.5 Plasma cutting ............................................................................................... 56

11.2.6 Plasma welding ............................................................................................. 56

11.2.7 Plasma gouging ............................................................................................. 56

11.2.8 Additional requirements ................................................................................. 56

11.3 Mechanical switching devices used to adjust output .............................................. 57

11.4 Welding circuit connections ................................................................................... 57

11.4.1 Protection against unintentional contact ......................................................... 57

11.4.2 Location of coupling devices .......................................................................... 57

11.4.3 Outlet openings ............................................................................................. 57

11.4.4 Three-phase multi-operator welding transformer ............................................ 57

11.4.5 Marking ......................................................................................................... 58

11.4.6 Connections for plasma cutting torches ......................................................... 58

11.5 Power supply to external devices connected to the welding circuit ........................ 58

11.6 Auxiliary power supply .......................................................................................... 58

11.7 Welding cables ..................................................................................................... 59

12 Control circuits .............................................................................................................. 59

12.1 General requirement ............................................................................................. 59

12.2 Isolation of control circuits .................................................................................... 59

12.3 Working voltages of remote control circuits ........................................................... 59

13 Hazard reducing device ................................................................................................. 60

13.1 General requirements ........................................................................................... 60

13.2 Types of hazard reducing devices ......................................................................... 60

13.2.1 Voltage reducing device ................................................................................ 60

13.2.2 Switching device for AC to DC ....................................................................... 60

13.3 Requirements for hazard reducing devices ............................................................ 60

13.3.1 Disabling the hazard reducing device ............................................................ 60

13.3.2 Interference with operation of a hazard reducing device ................................ 61

13.3.3 Indication of satisfactory operation ................................................................ 61

13.3.4 Fail to a safe condition .................................................................................. 61

14 Mechanical provisions ................................................................................................... 61

14.1 General requirements ........................................................................................... 61

14.2 Enclosure ............................................................................................................. 61

14.2.1 Enclosure materials ....................................................................................... 61

14.2.2 Enclosure strength ......................................................................................... 62

14.3 Handling means .................................................................................................... 62

14.3.1 Mechanised handling ..................................................................................... 62

14.3.2 Manual handling ............................................................................................ 62

14.4 Drop withstand ...................................................................................................... 63

14.5 Tilting stability ....................................................................................................... 63

15 Rating plate ................................................................................................................... 63

15.1 General requirements ........................................................................................... 63

15.2 Description ........................................................................................................... 64

15.3 Contents ............................................................................................................... 65

15.4 Tolerances ............................................................................................................ 68

15.5 Direction of rotation .............................................................................................. 68

16 Adjustment of the output ................................................................................................ 68

16.1 Type of adjustment ............................................................................................... 68

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IEC 60974-1:2017 © IEC 2017 – 5 –

16.2 Marking of the adjusting device ............................................................................. 69

16.3 Indication of current or voltage control .................................................................. 69

17 Instructions and markings .............................................................................................. 70

17.1 Instructions ........................................................................................................... 70

17.2 Markings ............................................................................................................... 71

Annex A (informative) Nominal voltages of supply networks ................................................. 72

Annex B (informative) Example of a combined dielectric test ............................................... 73

Annex C (normative) Unbalanced load in case of AC tungsten inert-gas welding power

sources ................................................................................................................................. 74

C.1 General ................................................................................................................. 74

C.2 Unbalanced load ................................................................................................... 74

C.3 Example for an unbalanced load ........................................................................... 75

Annex D (informative) Extrapolation of temperature to time of shutdown .............................. 76

Annex E (normative) Construction of supply circuit terminals ............................................... 77

E.1 Size of terminals ................................................................................................... 77

E.2 Connections at the terminals ................................................................................. 77

E.3 Construction of the terminals ................................................................................ 78

E.4 Fixing of the terminals ........................................................................................... 78

Annex F (informative) Cross-reference to non-SI units ......................................................... 79

Annex G (informative) Suitability of supply network for the measurement of the true

r.m.s. value of the supply current .......................................................................................... 80

Annex H (informative) Plotting of static characteristics ......................................................... 81

H.1 General ................................................................................................................. 81

H.2 Method ................................................................................................................. 81

H.3 Analysis of the results ........................................................................................... 81

Annex I (normative) Test methods for a 10 Nm impact ......................................................... 82

I.1 Pendulum impact hammer ..................................................................................... 82

I.2 Free fall spherical steel weight .............................................................................. 83

Annex J (normative) Thickness of sheet metal for enclosures .............................................. 84

Annex K (informative) Examples of rating plates .................................................................. 87

Annex L (informative) Graphical symbols for arc welding equipment .................................... 94

L.1 General ................................................................................................................. 94

L.2 Use of symbols ..................................................................................................... 94

L.2.1 General ......................................................................................................... 94

L.2.2 Selection of symbols ...................................................................................... 94

L.2.3 Size of symbols ............................................................................................. 94

L.2.4 Use of colour ................................................................................................. 94

L.3 Symbols ................................................................................................................ 95

L.3.1 General ......................................................................................................... 95

L.3.2 Letter symbols ............................................................................................... 95

L.3.3 Graphical symbols ......................................................................................... 96

L.4 Examples of combinations of symbols ................................................................. 116

L.5 Examples of control panels ................................................................................. 118

Annex M (informative) Efficiency and idle state power measurement ................................. 121

M.1 Measuring efficiency ........................................................................................... 121

M.2 Measuring idle state power ................................................................................. 121

Annex N (normative) Touch current measurement in fault condition ................................... 123

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– 6 – IEC 60974-1:2017 © IEC 2017

Annex O (normative) Battery-powered welding power sources ........................................... 128

O.1 General ............................................................................................................... 128

O.4 Environmental conditions ....................................................................................

...

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