IEC 60974-5
Edition 2.0 2007-11
INTERNATIONAL STANDARD NORME
INTERNATIONALE
Arc welding equipment –  Part 5: Wire feeders
Matériel de soudage à l’arc –  Partie 5: Dévidoirs
INTERNATIONAL
ELECTROTECHNICAL COMMISSION
COMMISSION
ELECTROTECHNIQUE INTERNATIONALE
R
ICS 25.160 PRICE CODE CODE PRIX
ISBN 2-8318-9390-9
ARC WELDING EQUIPMENT –
Part 5: Wire feeders
1 Scope
This part of IEC 60974 specifies safety and performance requirements for industrial and professional equipment used in arc welding and allied processes to feed filler wire.
The wire feeder may be a stand-alone unit which may be connected to a separate welding power source or one where the welding power source and the wire feeder are housed in a single enclosure.
The wire feeder may be suitable for manually or mechanically guided torches.
This part of IEC 60974 is not applicable to spool-on torches that are covered by IEC 60974-7. This part of IEC 60974 is not applicable to wire feeders which are designed for use by laymen and are covered by IEC 60974-6.
NOTE 1 Typical allied processes are, for example, plasma arc cutting and arc spraying.
NOTE 2 This standard does not include electromagnetic compatibility (EMC) requirements.
2 Normative references
The following referenced documents are indispensable for the application 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 60050-195, International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and protection against electric shock
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60974-1:2005, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7, Arc welding equipment – Part 7: Torches
IEC 60974-10, Arc welding equipment – Part 10: Electromagnetic compatibility (EMC) requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions of IEC 60050(195), IEC 60974-1, and IEC 60974-7, as well as the following, apply.
3.1
crushing zone
place or area in which the human body or parts of the human body are exposed to a crushing hazard
NOTE This hazard will be generated, if two movable parts are moving towards each other or one movable part is moving towards a fixed part.
5.2 Measuring
instruments
As specified in 5.2 of IEC 60974-1.
5.3 Conformity of components
As specified in 5.3 of IEC 60974-1.
tests
5.4 Type
All type tests given below shall be carried out on the same wire feeder.
As a condition of conformity the type tests given below shall be carried out in the following sequence:
a) visual inspection  (see 3.7 of IEC 60974-1);
b) insulation resistance (see 6.1.4 of IEC 60974-1 (preliminary check));
c) enclosure (see 14.2 of  IEC 60974-1);
d) handling means (see 10.3);
e) drop withstand (see 10.4);
f) protection provided by the enclosure (see 6.2.1);
g) insulation resistance (see 6.1.4 of IEC 60974-1);
h) dielectric strength (see 6.1.5 of IEC 60974-1);
i) visual inspection (see 3.7 of IEC 60974-1).
The other tests included in this standard and not listed here may be carried out in any convenient sequence.
tests
5.5 Routine
All routine tests given below shall be carried out on each wire feeder in the following sequence:
a) visual inspection (see 3.7 of IEC 60974-1);
b) continuity of the protective circuit, if applicable (see 10.4.2 of IEC 60974-1);
c) dielectric strength (see 6.1.5 of IEC 60974-1);
d) visual inspection (see 3.7 of IEC 60974-1).
6 Protection against electric shock
6.1 Insulation
See 6.1 of IEC 60974-1.
6.2 Protection against electric shock in normal service (direct contact)
6.2.1 Protection provided by the enclosure
The minimum degree of protection for wire feeders shall be in accordance with Table 1.
Table 1 – Minimum degree of protection
Component Designed for
indoor use
Designed for
outdoor use
Motor and control supplied by a voltage ≤ SELV IP2X IP23S Motor and control supplied by a voltage > SELV IP21S IP23S Live parts at welding potential for wire feeders used
with manually guided torches (for example, filler
wire, wire spool, drive rolls)
IPXX IPX3
Live parts at welding potential for wire feeders used
with mechanically guided torches (for example, filler
wire, wire spool, drive rolls)
IPXX IPXX NOTE  See also 10.8.
Wire feeders with degree of protection IP23S may be stored but are not intended to be used outside during precipitation unless sheltered.
Adequate drainage shall be provided by the enclosure. Retained water shall not interfere with the correct operation of the equipment or impair safety.
Conformity shall be checked as specified in IEC 60529.
For this test, the filler wire shall be fed into the drive system and all external connectors shall be connected or covered.
The degree of water protection is met if, immediately after this test, the dielectric strength is verified as specified in 6.2.1 of IEC 60974-1.
When live parts at welding potential are protected against precipitation, the filler wire shall show no visual wetness after the test.
6.2.2 Capacitors
pulleys
See 6.2.2 of IEC 60974-1.
6.2.3 Automatic discharge of input capacitors
See 6.2.3 of IEC 60974-1.
6.3 Protection against electric shock in case of a fault condition (indirect contact)
6.3.1 Isolation of the supply circuit and the welding circuit
See 6.3.2 of IEC 60974-1.
NOTE Only one reinforced or double insulation between the welding circuit and the mains is required.
6.3.2 Isolation of the welding circuit from the frame
Live parts at welding potential (for example, filler wire, wire spool, drive rolls) shall be isolated from the wire feeder frame or other structure to which they are attached by basic insulation (see Tables 1 and 2 of IEC 60974-1).
Conformity shall be checked as specified in 6.1 of IEC 60974-1.
6.10 Control circuits
See Clause 12 of IEC 60974-1.
6.11 Insulation of hanging means
If an attachment is provided for hanging the wire feeder during welding, the attachment shall be electrically insulated from the wire feeder enclosure.
A warning in the instructions shall be given that, if an alternative method of support is used, insulation should be provided between the wire feeder enclosure and the support.
Conformity shall be checked by visual inspection.
7 Liquid cooling system
Component parts of wire feeders, through which cooling liquid flows, shall be capable of operating at an inlet pressure up to 0,5 MPa (5 bar) and with a coolant temperature up to 70 °C without leaking.
Conformity shall be checked by measurement and visual inspection while applying 0,75 MPa (7,5 bar) for 30 s.
8 Shielding gas supply
Component parts of wire feeders, through which shielding gas flows and which are under pressure when the gas valve is closed, shall be capable of operating at an inlet pressure up to 0,5 MPa (5 bar) without leaking. In the case where multiple valves are used, they shall be tested independently.
Conformity shall be checked by visual inspection while blocking the gas valve and applying an inlet pressure of 0,75 MPa (7,5 bar) for 30 s.
9 Thermal requirements
Wire feeders designed for use with manual torches shall be capable of operating under maximum load at 60 % duty cycle (6 min “on” and 4 min “off”) without causing any component to exceed its rated temperature.
Where a wire feeder and a power source are housed in a single enclosure, the wire feeder shall be capable of operating under maximum load at the duty cycle corresponding to the rated maximum welding current of the power source.
Wire feeders designed for use with mechanically guided torches shall be capable of operating under m
aximum load at 100 % duty cycle without causing any component to exceed its rated temperature.
For liquid-cooled apparatus, the test shall be carried out with the minimum flow and the maximum temperature of the coolant, as recommended by the manufacturer.
Additionally, the wire feeder shall meet the requirements specified above, when it is cycled for 4 s “on” and 2 s “off” during the 6 min “on” time of the duty cycle specified above.
Current-carrying components, incorporated in the wire feeder, shall be capable of carrying the rated welding current

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