Arc welding equipment - Part 1: Welding power sources

IEC 60974-1:2021 is available as IEC 60974-1:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60974-1:2021 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 sixth edition cancels and replaces the fifth edition published in 2017 and Amendment 1:2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Table 1 with an alphabetical cross-reference listing of terms added;
- clearance and creepage distance reference document changed to IEC 60664-1:2020;
- 6.1.2 and 6.1.3 modified to follow IEC 60664-1 basic insulation dimensioning for mains supply with rationalized voltages;
- abnormal capacitor test of 6.2.2 moved to new Subclause 9.5;
- 6.2.5 and 6.3.6 modified to use touch current measuring network weighted for letgo-immobilization and supply voltage tolerance requirement added;
- 16.3 new structure and accuracy requirement for displayed voltage value ;
- Annex A changed to normative and Table A.2 and Table A.3 added;
- Annex L editorial update to standardized symbols;
- redraft of efficiency and idle state power measurement in Annex M based on IEC 62301:2011;
- Annex N measurement network weighted for letgo-immobilization added.

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

IEC 60974-1:2021 est disponible sous forme de IEC 60974-1:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L’IEC 60974-1:2021 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. Cette sixième édition annule et remplace la cinquième édition parue en 2017 et l'Amendement 1:2019. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente.
- Ajout du Tableau 1 avec la liste des termes par référence croisée dans l’ordre alphabétique de la langue source.
- Le document de référence des distances d’isolement dans l’air et des lignes de fuite devient IEC 60664-1:2020.
- Modification du 6.1.2 et du 6.1.3 afin de respecter le dimensionnement de l’isolation principale spécifié dans l’IEC 60664-1 pour le réseau d’alimentation avec des tensions rationalisées.
- Déplacement de l’essai de condensateur anormal du 6.2.2 au nouveau 9.5.
- Modification du 6.2.5 du 6.3.6 afin d’utiliser le réseau de mesure du courant de contact pondéré pour une opération de non-lâcher/immobilisation et ajout d’une exigence de tolérance pour la tension d’alimentation.
- Nouvelle structure du 16.3 et nouvelle exigence d’exactitude pour la valeur de tension affichée.
- Modification de l’Annexe A qui devient une annexe normative et ajout du Tableau A.2 et du Tableau A.3.
- Mise à jour rédactionnelle de l’Annexe L pour l'utilisation des symboles normalises.
- Nouvelle rédaction du mesurage du rendement et de la puissance en état au ralenti (Annexe M sur la base de l’IEC 62301:2011).
- Ajout d’un réseau de mesure pondéré pour une opération de non-lâcher/immobilisation (Annexe N).

General Information

Status
Published
Publication Date
28-Jun-2021
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
29-Jun-2021
Ref Project

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IEC 60974-1
Edition 6.0 2021-06
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 60974-1:2021-06(en-fr)
---------------------- Page: 1 ----------------------
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IEC 60974-1
Edition 6.0 2021-06
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 978-2-8322-9914-2

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60974-1:2021 © IEC 2021
CONTENTS

FOREWORD  .......................................................................................................................... 7

1 Scope  ............................................................................................................................. 9

2 Normative references  ...................................................................................................... 9

3 Terms and definitions  .................................................................................................... 10

3.1 General terms  and definitions ............................................................................... 12

3.2 Terms and definitions related to BATTERY SYSTEMs  ................................................ 21

3.3 Terms and definitions related to efficiency and IDLE STATE power

measurement ........................................................................................................ 23

4 Environmental conditions  .............................................................................................. 25

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

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

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

5.3 Conformity of components  .................................................................................... 26

5.4 TYPE TESTs  ........................................................................................................... 27

5.5 ROUTINE TESTs  ...................................................................................................... 27

6 Protection against electric shock  ................................................................................... 28

6.1 Insulation .............................................................................................................. 28

6.2 Protection against electric shock in normal service (direct contact)  ....................... 35

6.3 Protection against electric shock in case of a fault condition (indirect contact)  ...... 38

7 Thermal requirements  ................................................................................................... 40

7.1 Heating test  .......................................................................................................... 40

7.2 Temperature measurement  ................................................................................... 41

7.3 Limits of TEMPERATURE RISE  .................................................................................. 43

7.4 Loading test .......................................................................................................... 44

7.5 Commutators and slip-rings  .................................................................................. 45

8 THERMAL PROTECTION  ..................................................................................................... 45

8.1 General requirements  ........................................................................................... 45

8.2 Construction  ......................................................................................................... 45

8.3 Location  ............................................................................................................... 45

8.4 Operating capacity  ............................................................................................... 46

8.5 Operation  ............................................................................................................. 46

8.6 Resetting  .............................................................................................................. 46

8.7 Indication .............................................................................................................. 46

9 Abnormal operation  ....................................................................................................... 46

9.1 General requirements  ........................................................................................... 46

9.2 Stalled fan test  ..................................................................................................... 47

9.3 Short circuit test  ................................................................................................... 47

9.4 Overload test  ........................................................................................................ 48

9.5 Capacitors short circuit  ......................................................................................... 48

10 Connection to the supply network  .................................................................................. 48

10.1 Supply voltage  ...................................................................................................... 48

10.2 Multi-supply voltage  .............................................................................................. 49

10.3 Means of connection to the SUPPLY CIRCUIT  ........................................................... 49

10.4 Marking of terminals  ............................................................................................. 49

10.5 PROTECTIVE CIRCUIT  .............................................................................................. 50

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IEC 60974-1:2021 © IEC 2021 – 3 –

10.6 Cable anchorage  .................................................................................................. 51

10.7 Inlet openings  ....................................................................................................... 52

10.8 SUPPLY CIRCUIT on/off switching device  ................................................................. 52

10.9 Supply cables  ....................................................................................................... 53

10.10 Supply coupling device (attachment plug)  ............................................................. 54

11 Output  ........................................................................................................................... 54

11.1 RATED NO-LOAD VOLTAGE   ...................................................................................... 54

11.2 TYPE TEST values of the CONVENTIONAL LOAD VOLTAGE  ........................................... 57

11.3 Mechanical switching devices used to adjust output  ............................................. 58

11.4 WELDING CIRCUIT connections  ............................................................................... 59

11.5 Power supply to external devices connected to the WELDING CIRCUIT  ..................... 60

11.6 Auxiliary power supply  .......................................................................................... 60

11.7 Welding cables  ..................................................................................................... 60

12 CONTROL CIRCUITs  ......................................................................................................... 61

12.1 General requirement  ............................................................................................. 61

12.2 Isolation of CONTROL CIRCUITs  ............................................................................... 61

12.3 WORKING VOLTAGEs of remote CONTROL CIRCUITs  ................................................... 61

13 HAZARD REDUCING DEVICE  ............................................................................................... 61

13.1 General requirements  ........................................................................................... 61

13.2 Types of HAZARD REDUCING DEVICES  ...................................................................... 62

13.3 Requirements for HAZARD REDUCING DEVICEs  ......................................................... 62

14 Mechanical provisions  ................................................................................................... 63

14.1 General requirements  ........................................................................................... 63

14.2 Enclosure  ............................................................................................................. 63

14.3 Handling means  .................................................................................................... 64

14.4 Drop withstand  ..................................................................................................... 64

14.5 Tilting stability  ...................................................................................................... 65

15 RATING PLATE  ................................................................................................................. 65

15.1 General requirements  ........................................................................................... 65

15.2 Description  ........................................................................................................... 65

15.3 Contents  ............................................................................................................... 66

15.4 Tolerances  ........................................................................................................... 69

15.5 Direction of rotation  .............................................................................................. 70

16 Adjustment of the output  ............................................................................................... 70

16.1 Type of adjustment  ............................................................................................... 70

16.2 Marking of the adjusting device  ............................................................................ 70

16.3 Indication of current or voltage control  .................................................................. 71

17 Instructions and markings  ............................................................................................. 71

17.1 Instructions  ........................................................................................................... 71

17.2 Markings  .............................................................................................................. 72

Annex A (normative) Nominal voltages of supply networks  .................................................. 73

Annex B (informative) Example of a combined dielectric test  ............................................... 76

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

POWER SOURCES  .................................................................................................................... 77

C.1 General  ................................................................................................................ 77

C.2 Unbalanced load ................................................................................................... 78

C.3 Example for an unbalanced load  ........................................................................... 78

Annex D (informative) Extrapolation of temperature to time of shutdown  ............................. 80

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– 4 – IEC 60974-1:2021 © IEC 2021

Annex E (normative) Construction of SUPPLY CIRCUIT terminals  ............................................ 81

E.1 Size of terminals  ................................................................................................... 81

E.2 Connections at the terminals  ................................................................................ 81

E.3 Construction of the terminals  ................................................................................ 82

E.4 Fixing of the terminals  .......................................................................................... 82

Annex F (informative) Cross-reference to non-SI units  ......................................................... 83

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

RMS value of the supply current  ........................................................................................... 84

Annex H (informative) Plotting of STATIC CHARACTERISTICS  ................................................... 85

H.1 General  ................................................................................................................ 85

H.2 Method  ................................................................................................................. 85

H.3 Analysis of the results  .......................................................................................... 85

Annex I (normative) Test methods for a 10 Nm impact  ......................................................... 86

I.1 Pendulum impact hammer  .................................................................................... 86

I.2 Free fall spherical steel weight  ............................................................................. 86

Annex J (normative) Thickness of sheet metal for enclosures  .............................................. 88

Annex K (informative) Examples of RATING PLATES  ............................................................... 90

Annex L (informative) Graphical symbols for arc welding equipment  .................................... 97

L.1 General  ................................................................................................................ 97

L.2 Use of symbols  ..................................................................................................... 97

L.3 Symbols  ............................................................................................................... 98

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 General conditions for measurement  .................................................................. 121

M.2 Measurements  .................................................................................................... 122

M.3 Test report  .......................................................................................................... 125

M.4 Test report template ............................................................................................ 127

Annex N (normative) TOUCH CURRENT measurement   ......................................................... 129

Annex O (normative) Battery-powered WELDING POWER SOURCES  ....................................... 135

O.1 General  .............................................................................................................. 135

O.4 Environmental conditions  .................................................................................... 136

O.5 Tests  .................................................................................................................. 136

O.6 Protection against electric shock  ........................................................................ 138

O.7 Thermal requirements  ......................................................................................... 140

O.8 THERMAL PROTECTION  .......................................................................................... 142

O.9 Abnormal operation  ............................................................................................ 142

O.10 Connection to the supply network  ....................................................................... 146

O.14 Mechanical provisions  ........................................................................................ 148

O.15 RATING PLATE  ...................................................................................................... 149

O.17 Instructions and markings  ................................................................................... 151

Bibliography  ....................................................................................................................... 153

Figure 1 – Flow chart for conformity methods of 5.3  ............................................................. 26

Figure 2 – Example of insulation configuration for CLASS I EQUIPMENT  ................................... 29

Figure 3 – Measurement of WELDING CIRCUIT TOUCH CURRENT  ................................................ 37

Figure 4 – Measurement of TOUCH CURRENT in normal condition   .......................................... 37

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IEC 60974-1:2021 © IEC 2021 – 5 –

Figure 5 – Measurement of RMS values  ............................................................................... 56

Figure 6 – Measurement of peak values  ............................................................................... 57

Figure 7 – Principle of the RATING PLATE   .............................................................................. 66

Figure B.1 – Combined high-voltage transformers  ................................................................ 76

Figure C.1 – Voltage and current during AC tungsten inert-gas welding  ................................ 77

Figure C.2 – Unbalanced voltage during AC tungsten inert-gas welding  ............................... 78

Figure C.3 – AC WELDING POWER SOURCE with unbalanced load  ............................................ 79

Figure I.1 – Test set-up  ........................................................................................................ 86

Figure K.1 – Single-phase transformer  ................................................................................. 90

Figure K.2 – Three-phase rotating frequency converter  ........................................................ 91

Figure K.3 – Subdivided RATING PLATE: single-/three-phase transformer rectifier  ................... 92

Figure K.4 – Engine-generator-rectifier  ................................................................................. 93

Figure K.5 – Single-/three-phase inverter type  ...................................................................... 94

Figure K.6 – Battery-powered WELDING POWER SOURCE with INTEGRAL BATTERY  ...................... 95

Figure K.7 – Battery-powered WELDING POWER SOURCE with detachable / separable

BATTERY  ................................................................................................................................ 96

Figure L.1 – Input voltage power switch .............................................................................. 118

Figure L.2 – Arc force control potentiometer ....................................................................... 118

Figure L.3 – Remote receptacle and selector switches ........................................................ 118

Figure L.4 – Terminals with inductance selector for MIG/MAG welding................................ 119

Figure L.5 – Process switch (MMA, TIG, MIG) .................................................................... 119

Figure L.6 – Selector switch on AC/DC equipment .............................................................. 119

Figure L.7 – Panel indicator lights (overheat, fault, arc striking, output voltage) .................. 119

Figure L.8 – Setting pulsing parameters using digital display .............................................. 120

Figure M.1 – Measurement procedure   ............................................................................... 125

Figure N.1 – Measuring network, TOUCH CURRENT weighted for perception or

startle-reaction  ................................................................................................................... 129

Figure N.2 – Measuring network, TOUCH CURRENT weighted for letgo-immobilization   .......... 130

Figure N.3 – Diagram for TOUCH CURRENT measurement on fault condition at operating

temperature for single-phase connection of appliances other than those of CLASS II  ........... 132

Figure N.4 – Diagram for TOUCH CURRENT measurement on fault condition for three-

phase four-wire system connection of appliances other than those of CLASS II  .................... 134

Figure O.1 – Marking of BATTERY VOLTAGE CLASS B electric components  ............................. 152

Table 1 – Alphabetical list of terms ....................................................................................... 11

Table 2 – Minimum CLEARANCES for overvoltage category III ................................................. 30

Table 3 – Minimum CREEPAGE DISTANCES .............................................................................. 32

Table 4 – Insulation resistance ............................................................................................. 33

Table 5 – Dielectric test voltages .......................................................................................... 34

Table 6 – Minimum distance through insulation ..................................................................... 38

Table 7 – Temperature limits for windings, commutators and slip-rings ................................. 43

Table 8 – Temperature limits for external surfaces ................................................................ 44

Table 9 – Cross-section of the output short-circuit conductor ................................................ 47

Table 10 – Current and time requirements for PROTECTIVE CIRCUITS ...................................... 50

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– 6 – IEC 60974-1:2021 © IEC 2021

Table 11 – Minimum cross-sectional area of the external protective copper conductor .......... 51

Table 12 – Verification of continuity of the PROTECTIVE CIRCUIT .............................................. 51

Table 13 – Pull...................................................................................................................... 52

Table 14 – Summary of allowable RATED NO-LOAD VOLTAGES .................................................. 56

Table 15 – HAZARD REDUCING DEVICE requirements ................................................................ 62

Table A.1 – Nominal voltages for supply networks with protective overvoltage control .......... 73

Table A.2 – Single-phase three-wire or two-wire AC or DC systems ...................................... 74

Table A.3 – Three-phase four-wire or three-wire AC systems ................................................ 75

Table E.1 – Range of conductor dimensions to be accepted by the SUPPLY CIRCUIT

terminals ............................................................................................................................... 81

Table F.1 – Cross-reference for mm to American wire gauge (AWG) ................................... 83

Table I.1 – Angle of rotation θ to obtain 10 Nm impact .......................................................... 86

Table I.2 – Mass of the free fall weight and height of the free fall .......................................... 87

Table J.1 – Minimum thickness of sheet metal for steel enclosures ....................................... 88

Table J.2 – Minimum thickness of sheet metal for enclosures of aluminium, brass or

copper .................................................................................................................................. 89

Table L.1 – Letters used as symbols ........................................
...

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