NORME
INTERNATIONALE
INTERNATIONAL STANDARD
CEIIEC60974-7
Deuxième éditionSecond edition
2005-07
Matériel de soudage à l'arc – Partie 7: Torches
Arc welding equipment – Part 7: Torches
Numéro de référence Reference number CEI/IEC 60974-7:2005
60974-7 IEC:2005 – 11 –
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.
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 not applicable to electrode holders for manual metal arc welding or torches for air-arc cutting/gouging.
NOTE 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 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(151), International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and magnetic devices
IEC 60050(851), International Electrotechnical Vocabulary (IEV) – Chapter 851: Electric welding
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 60974-1:2005, Arc welding equipment – Part 1: Welding power sources IEC 60974-2, Arc welding equipment – Part 2: Liquid cooling systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050(151), IEC 60050(851), IEC 60664-1, and IEC 60974-1, as well as the following, apply.
NOTE Additional terminology is given in Annex A.
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)
60974-7 IEC:2005 – 19 –
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 an ambient air temperature between 10 °C and 40 °C. The accuracy of measuring instruments shall be:
a) electrical measuring instruments: class 0,5 (±0,5 % 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
Torches shall be rated according to the classification and use as given in Table 1. TIG torches shall additionally have an arc striking and stabilizing voltage rating.
60974-7 IEC:2005 – 21 –
Table 1 – Voltage rating of torches
Voltage rating
Insulation resistance
MΩ
Dielectric strength V r.m.s.
Degree of protection in accordance with IEC 60529 Nozzle orifice
Handle Otherparts
Classification
Vpeak
Manually guided torches except for plasma cutting Mechanically guided
torches except for plasma cutting
Manually guided plasma cutting torches Mechanically guided plasma cutting torches
113 1 1 000 IP0X IP3X IP3X Not 141 1 1 000 IP0X applicable Plasma tip,
500 2,5 2 100 see 7.4.2
IP2X
IP4X IP3X IP2X
Not
500 2,5 2 100 IP0X applicable
7.2 Insulation resistance
The insulation resistance of a new torch shall, after the humidity treatment, be not less than the values given in Table 1.
Conformity shall be checked by the following test. a) Humidity treatment
A humidity cabinet is maintained at a temperature t between 20 °C and 30 °C and a
relative humidity between 91 % and 95 %.
The torch fitted with the cable-hose assembly (liquid-cooled torches without cooling liquid) is brought to a temperature between t and (t + 4) °C and is then placed for 48 h in the humidity cabinet.
Immediately after the humidity treatment, the torch handle and 1 m at each end of the cable-hose assembly are wiped clean and tightly wrapped in a metal foil covering the external surface of the insulation.
The insulation resistance is measured by the application of a d.c. voltage of 500 V between
– all circuits and the metal foil, and
– all wires and circuits intended to be isolated from each other within the torch. The reading is made after stabilization of the measurement. 7.3 Dielectric strength
The insulation shall withstand the test voltages of Table 1 without any flashover or breakdown.
In addition for manual plasma cutting torches the insulation between the handle and the cutting circuit shall withstand a test voltage of 3 750 V r.m.s.
b) Insulation resistance measurement
60974-7 IEC:2005 – 23 –
The a.c. test voltage shall be of an approximate sine waveform with a peak value not exceeding 1,45 times the voltage of Table 1, having a frequency of approximately 50 Hz or 60 Hz. Alternatively, a d.c. test voltage of 1,4 times the r.m.s. test voltage may be used. In addition, for torches intended for use with arc striking and/or stabilizing voltages, the insulation shall withstand a high-frequency voltage of pulse width 0,2 µs to 8 µs, a repetition frequency of 50 Hz to 300 Hz and shall be 20 % higher than the rated arc striking and/or stabilizing voltage. Alternatively, an a.c. test voltage of approximately sine waveform at 50 Hz or 60 Hz may be used.
The rated arc striking and/or stabilizing voltage shall be determined as follows for plasma cutting torches:
a) operate each power source expected to form a safe system (see item m) of Clause 13)
according to manufacturer's recommendation, for example with proper consumables and gasses, and under single fault condition; b) measure the arc striking and/or stabilizing voltage at each end of the torch;
c) the highest value measured from all power sources operated will be the rated arc striking
and/or stabilizing voltage. Conformity shall be checked by the following test. Liquid-cooled torches are tested without cooling liquid.
The handles are tightly wrapped with a metal foil. The cable and hose assembly is placed in contact with a conductive surface throughout its entire length, for example wrapped around a metal cylinder or coiled on a flat metal surface. The metal foil and the conductive surface are electrically connected.
NOTE During the dielectric strength test of plasma cutting torches, the electrode and plasma tip connections should be electrically connected together.
The full value of the test voltage is applied for 60 s between a) the conductive surface and each isolated circuit; b) all circuits intended to be isolated from each other. The test voltage may be slowly raised to the full value.
The maximum permissible setting of the overload release shall be 100 mA. The high-voltage transformer shall deliver the prescribed voltage up to the tripping current. Tripping of the overload release is regarded as a failure.
For torches intended for use with arc striking and/or stabilizing voltages, the torches shall be subjected to the high-frequency test voltage. The full value of the high-frequency voltage is applied for 2 s between the electrode circuit and a) the conductive surface; b) other isolated circuits.
Flashover or breakdown shall not occur. Any discharges unaccompanied by a voltage drop (corona) are disregarded.
60974-7 IEC:2005 7.4 7.4.1
– 25 –
Protection against electric shock in normal service (direct contact) Degree of protection requirements
Torches shall meet the degree of protection requirements of Table 1. Torches are not intended for operation during rain or snow or equivalent conditions. Conformity shall be checked in accordance with IEC 60529. 7.4.2
Additional requirements for plasma cutting torches
The combination of plasma cutting torch and recommended plasma cutting power source shall form a safe system.
Live parts of the welding/cutting circuits and the control circuits shall be protected against direct contact in accordance with Table 1.
Plasma tips, which, for technical reasons cannot be protected against direct contact, are considered to be sufficiently protected for normal use and single-fault condition if the following requirements are fulfilled:
a) when no arc current is present:
the voltage between the plasma tip and the workpiece and/or earth is not higher than the values given in 11.1.1 of IEC 60974-1;
the cutting power source is fitted with a hazard reducing device in accordance with Clause 13 of IEC 60974-1;
or
and
b) for manual systems, when an arc current is present:
the sides of the plasma tip cannot be contacted by the test finger in accordance with IEC 60529 when it is placed on a flat surface with its centre line perpendicular to it; or
the d.c. voltage between the plasma tip and the workpiece and/or earth is not under any circumstances higher than the values given in 11.1.1 of IEC 60974-1.
NOTE An example of a fault is an abnormal condition resulting from the electrode being in contact with the plasma tip because of missing insulators, sticking of the plasma tip to the electrode, conductive material between plasma tip and electrode, wrong parts, loose parts, electrode abrasion, parts inserted incorrectly, excessive load or incorrect gas flow.
Conformity shall be tested with the jointed test finger in accordance with IP2X of IEC 60529. The power source shall be tested in accordance with IEC 60974-1.
8 Thermal rating
8.1 General
Torches shall be rated at a minimum of 100 % or 60 % or 35 % duty cycle. 8.2 Temperature rise
The temperature rise at any point on the outer surface of the part of the handle gripped by the operator shall not exceed 30 K.
60974-7 IEC:2005 – 27 –
The temperature rise at any point on the outer surface of the cable-hose assembly shall not exceed 40 K.
After completion of the tests, the safety and operability of the torch shall not be impaired. Conformity shall be checked by the heating test according to 8.3. 8.3 Heating test 8.3.1 General
The torches shall be loaded with a rated current at the corresponding rated duty cycle, see 8.1.
The mean value of the d.c. current shall be taken and the electrode polarity shall be chosen in accordance with 8.3.2 and 8.3.3.
The temperature shall be measured at the hottest spot
a) on the area of the handle, normally gripped by the operator
and
b) on the cable-hose assembly.
The temperature measuring device(s), handle and cable-hose assembly shall be protected from draughts and radiant heat.
The torch clamping device used shall not significantly affect the test result, for example by heat loss.
Liquid–cooled torches shall be continuously cooled with the minimum flow rate and minimum cooling power (as defined in IEC 60974-2) as specified by the manufacturer (see item e) of Clause 13).
Each heating test shall be carried out for a period of not less than 30 min and continued until the rate of temperature rise does not exceed 2 K/h. The cycle time for test purposes shall be 10 min.
The ambient and torch temperature shall be measured simultaneously during the last 10 min in the case of continuous load (100 % duty cycle). For lower duty cycles, it shall be measured in the middle of the load period during the last cycle.
The ambient air temperature is measured by a device, located at a distance of 2 m, at the same height as the torch and shall be protected from draughts and radiant heat. 8.3.2
Metal inert/active gas (MIG/MAG) and self-shielded flux-cored arc welding torch
A metal tube of a diameter and length appropriate to the welding process, for example 400 mm in diameter and 500 mm long, is horizontally clamped into a rotating device. The inside of the tube is cooled by means of water.
60974-7 IEC:2005 – 29 –
The torch shall be positioned in a plane perpendicular to the tube axis in such a way that the
0
handle is on the cooler side and the wire electrode is 15−15° to the vertical (see Figure B.1).
The torch shall be moved parallel to the centre line of the tube in order to form a weld bead. a) Test conditions for metal inert gas arc welding (MIG) of aluminium alloys are given below
and in Table 2:
– wire electrode: – type of voltage: – electrode polarity: – shielding gas: – tube material:
aluminium, 3 % to 5 % magnesium; d.c.; positive; argon; aluminium alloy;
– load voltage and welding speed: adjusted to give a stable arc and a continuous weld
pool. Table 2 – Test values for metal inert gas arc welding (MIG) of aluminium alloys
Welding current
Nominal diameter of the wire electrode
Distance between contact tip and metal
tube ±20 %
Maximum gas flow
A mm mm l/min Up to 150 151 to 200 201 to 300 301 to 350 351 to 500 Above 500
0,8 1 1,2 1,6 2 2,4
10 15 18 22 26 28
10 12 15 18 20 20
b) Test conditions for metal active gas arc welding (MAG) of mild steel are given below and
in Table 3:
– wire electrode: – type of voltage: – electrode polarity: – shielding gas: – tube material:
copper-coated mild (low carbon) steel; d.c.; positive;
argon/CO2 mixed gas (15 % to 25 % CO2); mild (low carbon) steel;
– load voltage and welding speed: adjusted to give a stable arc and a continuous
weld pool. If additional values for the shielding gas CO2 are specified in the instructions for use, an
additional test with this gas shall be carried out according to the test conditions given in Table 3.
60974-7 IEC:2005 – 31 –
Table 3 – Test values for metal active gas arc welding (MAG) of mild steel
Welding current
Nominal diameter of the
wire electrode
Distance between contact tip and metal
tube ±20 %
Maximum gas flow
A mm mm l/min Up to 150 151 to 250 251 to 350 351 to 500 Above 500
0,8 1 1,2 1,6 2
10 15 18 22 26
10 13 15 20 25
c) Test conditions for metal active gas arc welding (MAG) with flux-cored wire are given
below and in Table 4:
– wire electrode: – type of voltage: – electrode polarity: – shielding gas: – tube material:
rutile type; d.c.; positive;
argon/CO2 mixed gas (15 % to 25 % CO2); mild (low carbon) steel;
– load voltage and welding speed: adjusted to give a stable arc and a continuous weld
pool. Table 4 – Test values for metal active gas arc welding (MAG) with flux-cored wire
Welding current
Nominal diameter of the wire electrode
Distance between
contact tip and metal tube
±20 %
Maximum gas flow
A mm mm l/min 251 to 350 351 to 500 Above 500
1,2 to 1,4 1,6 to 2
2,4
25 30 35
15 18 20
d) Test conditions for self-shielded flux-cored arc welding of mild steel are given below and
in Table 5:
– wire electrode: • type 1: a wire designed with a fast freezing slag
for all-positional welding;
• type 2: a wire designed for high deposition rates in flat and horizontal vertical position welding;
– type of voltage: – electrode polarity:
– tube material:
d.c.;
• wire electrode type 1: negative; • wire electrode type 2: positive;
mild (low carbon) steel;
– load voltage and welding speed: adjusted to give a stable arc and a continuous
weld pool.
60974-7 IEC:2005 – 33 –
Table 5 – Test values for self-shielded flux-cored arc welding of mild steel
Welding current
Type of wire electrode
Nominal diameter of the electrode
Distance between contact tip and metal tube
±20 %
A mm mm Up to 250 251 to 350 351 to 500 Above 500
1 2 2 2
Up to1,2 1,6to2,0 2,4to3,0 3,2and more
20 50 50 60
8.3.3
Tungsten inert gas (TIG) and plasma arc welding torch
A copper block, with or without water cooling (see for example, Annex C), shall be used and
the torch shall be positioned perpendicular to the upper horizontal face of the copper block (see Figures B.2 and B.3).
For plasma welding torches, the shielding gas and the gas flow shall be as specified by the manufacturer in the instructions for use.
The testing installation shall be equipped with the instruments as shown in Figure A.5. The nominal a.c. welding currents of a torch are defined as 70 % of the nominal d.c. value. a) Test conditions for tungsten inert gas arc welding (TIG) are given below and in Table 6:
– electrode type:
tungsten alloy;
– electrode diameter: maximum for the test current as recommended by the
manufacturer; – type of voltage: – shielding gas: – load voltage:
d.c.; argon;
adjusted to give a stable arc and a continuous weld pool.
– electrode polarity: negative;
Table 6 – Test values for tungsten inert gas arc welding (TIG)
Welding current
Maximum gas flow
Distance between
nozzle and copper block
±1 mm
Distance between electrode and copper
block ±1 mm
A l/min mm mm Up to 150 151 to 250 251 to 350 351 to 500 Above 500
7 9 11 13 15
8 10 10 10 10
3 5 5 5 5
60974-7 IEC:2005 – 35 –
b) Test conditions for plasma welding are given below and in Table 7:
– type of voltage: – electrode polarity:
d.c.; negative;
– gases and gas flow: as specified by the manufacturer.
Table 7 – Test values for plasma arc welding
Welding current
Distance between
plasma tip and copper
block ±1 mm
A mm Up to 30 31 to 50 51 to 100 101 to 150 151 to 200 201 to 250 251 to 280 Above 280
3 3 3 4 6 8 8 10
8.3.4 Plasma cutting torch
The torch shall be tested
a) at the rated current with the corresponding rated duty cycle, see 8.1; b) with the type of gas and flow rate specified by the manufacturer; and
c) at the distance between plasma tip and workpiece specified by the manufacturer with one
of the following test arrangements:
1) copper block with a hole, according to Annex D or similar (suitable for use up to 75 A):
the torch shall be positioned perpendicularly to the upper horizontal face of the copper block and centred to the hole; 2) copper bars with a slot, according to Annex E or similar (suitable for use up to 200 A):
the torch shall be positioned perpendicularly to the upper horizontal face of the copper bars, centred between them and moved about 500 mm backwards and forwards; 3) cutting (suitable for all currents): the torch shall be positioned perpendicularly to a mild
steel sheet or tube with the maximum thickness specified by the manufacturer for the rated current. The cutting speed shall be sufficient to cut through the material. In order to reduce scrap, it is permitted to arrange the cutting so that the arc indexes approximately one kerf width per pass.
For a duty cycle lower than 100 % there shall be a new start after each stop. All cuts shall start at the edge of the steel sheet;
4) other means that are shown to be equivalent to 1), 2) or 3) above.
60974-7 IEC:2005 – 37 –
9 Pressure of the liquid cooling system
The liquid cooling system of liquid-cooled torches shall withstand a minimum pressure of 0,5 MPa (5 bar) at a minimum temperature of 70 °C without leakage.
Conformity shall be checked by measurement and visual inspection immediately following the heating test in accordance with 8.3.
10 Resistance to hot objects
The insulation of the handle and the cable-hose assembly excluding the coupling device shall be capable of withstanding hot objects and the effects of a normal amount of weld spatter without being ignited or becoming unsafe.
This requirement is not applicable for mechanically guided torches intended to be protected in their final installation.
Conformity shall be checked with a device according to Figure 1.
∅2,5 ± 0,05 Θ1 F 2 F = 1 N 0 +0,2 100 ± 0,5 IEC 1157/05
Key
1 18/8 chrome-nickel steel 2 Handle of the torch
Dimensions in millimetres
Θ Test temperature
Figure 1 – Device for testing the resistance to hot objects
An electric current (of approximately 23 A) is passed through the rod until a steady-state
5
temperature Θ of 250+ 0 °C is reached. During the test, the temperature of the heated rod shall be maintained. This temperature shall be measured by a contact thermometer or a thermocouple. The heated rod in a horizontal position is then applied for 2 min to the insulation at the weakest points (for example, minimum insulation thickness and closest distance to live parts). The heated rod shall not penetrate through the insulation and contact live parts. At the handle the heated rod shall be applied at the portion with the minimum wall thickness and where internal live parts are closest to the handle surface. An attempt is made to ignite any gases which may be emitted in the region of the contact point by means of an electric spark or small flame. If the gases are flammable, the burning shall stop as soon as the heated rod is removed.
Following the test, the handle and cable-hose assembly shall meet the requirements of Clause 7.
60974-7 IEC:2005 – 39 –
11 Mechanical provisions
11.1 Impact resistance
This clause does not apply to spool-on torches, mechanically guided and motorized torches. Torches shall have sufficient mechanical strength to ensure that, when used in accordance with the requirements, no damage occurs which will impair the safety or operability.
Fragile parts such as ceramic nozzles, etc. which, if damaged, impair the operability but not the safety may be replaced after the test.
Conformity shall be checked by the following impact test and visual inspection.
The torch at its full 3 m extension of its cable-hose assembly, is lifted to a height of 1 m, measured at the handle, i.e. 0,2 m above the level of the point where the cable-hose is fixed as shown in Figure 2.
1
2
3,0 m
3
4
0,8 m 1,0 m 5
IEC 1158/05
10 mm
Key
1 Cable-hose assembly 2 Fixing point 3 Torch handle
4 Table 5 Steel plate
Figure 2 – Device for the impact test
The torch handle is released without initial velocity and allowed to fall onto a hard and rigid surface, for example a steel plate. This procedure shall be repeated 10 times and arranged so that the torch falls on different parts.
Following the test, the torch shall meet the requirements of Clause 7 and be operable. 11.2 Accessible parts
Accessible parts shall have no sharp edges, rough surfaces or protruding parts likely to cause injury.
Conformity shall be checked by visual inspection.
60974-7 IEC:2005 – 41 –
12 Marking
The torch shall be clearly and indelibly marked as follows:
a) name of the manufacturer, distributor, importer or the registered trademark; b) type (identification) as given by the manufacturer;
c) reference to this standard, confirming that the torch complies with its requirements.
EXAMPLE:
Manufacturer – type – Standard XXX – YYY – IEC 60974-7
Conformity shall be checked by visual inspection and the test given in Clause 15 of IEC 60974-1.
13 Instructions for use
Each torch shall be delivered with an instruction sheet. This instruction sheet shall include, as a minimum, the following information, if applicable: a) process, see 5.2;
b) method of guidance, see 5.3;
c) voltage rating in accordance with Table 1. Include arc striking and stabilizing voltage
rating for TIG torches only. See 7.1; d) the relationship (for example in a table) between
1) rated current and corresponding duty cycle, see 8.1;
2) type of shielding gas (for example argon, CO2 or mixed gases with their percentage) or,
for plasma cutting torches, type of gas, flow rate and/or operating pressure; 3) length of the cable-hose assembly; 4) type and diameter range of the electrode or,
for plasma cutting torches, proper combinations of plasma tip, nozzle and electrode types;
e) type of cooling, see 5.4;
and for liquid-cooled torches: 1) minimum flow rate in l/min;
2) minimum and maximum inlet pressure in MPa (bar); 3) minimum cooling power in accordance with IEC 60974-2; f) rating of electrical controls incorporated in the torch; g) requirements for the connection of the torch;
h) essential information about the safe operation of the torch including environmental
conditions; i) reference to this standard confirming that the torch conforms with its requirements;
60974-7 IEC:2005 – 43 –
j) conditions under which extra precautions are to be observed (for example environment
with increased hazard of electric shock, flammable surroundings, flammable products, elevated working positions, ventilation, noise, closed containers, etc.). And additional for plasma cutting torches:
k) maximum and minimum gas pressure at the inlet;
l) essential information about the safe operation of the plasma cutting torch and the
functioning of interlocking and safety devices, for example a list of suitable plasma arc cutting system components identified by the manufacturer, model, catalogue and/or serial number, which the manufacturer recommends for use with the system. Each component listed shall be such that it provides the level of protection to the operator (including compatibility of safety devices and/or protection circuits, no-load voltage, striking voltage and safe connection of the torch to the plasma cutting power source) as originally provided; m) type (identification) of plasma cutting power source or sources that can form a safe
system with the plasma cutting torch. Conformity shall be checked by reading the instructions.
60974-7 IEC:2005 – 45 –
Annex A (informative)
Additional terminology
The following terms (see Table A.1) and drawings (see Figures A.1 to A.7 and B.1 to B.3), although not used in the body of this standard, are given as a useful aid to comprehend the construction and design of torches.
Table A.1 − List of terms
Reference in the
figures of Annexes A and B
English term
French term
buse
canon isolant tube-contact
adapteur avec ou sans diffuseur de gaz lance corps de torche
manche faisceau enveloppe de corps de torche protège-mains filtre de diffuseur diffuseur de gaz
porte-pince isolant thermique
pince porte-électrode électrode bouchon (court) bouchon (long) tuyère distributeur de gaz diffuseur de gaz
débitmètre thermomètre pression d'entrée
liquide de refroidissement gaz de protection
gaz plasma dévidoir torche dispositif de positionnement tube métallique bloc en cuivre
1 gas nozzle 2 insulator 3 contact tip 4
tip adapter with or without gas diffuser
5 neck 6
torch body
7 handle 8 cable-hose assembly 9
body housing
10 hand shield 11 12
gas lens filter gas lens
13 collet body 14
heat shield
15 collet 16 electrode 17 18
back cap (short) back cap (long)
19 plasma tip 20 21
gas distributor gas diffuser
22 flow meter 23 thermometer 24 25 26
inlet pressure cooling liquid shielding gas
27 plasma gas 28 wire feeder 29 torch 30 31 32
adjustment unit metal tube copper block
NOTE Items 29 to 32 are shown in the Figures of Annex B.
60974-7 IEC:2005
– 47 –
IEC 1457/99 IEC 1458/99
Figure A.1 – Torch for metal inert/active gas (MIG/MAG) and self-shielded flux-cored arc welding Figure A.2 – Gun for metal inert/active gas (MIG/MAG) and self-shielded flux-cored arc
welding
171615
62119
IEC 1459/99
7
8
2012
IEC 1460/99
1
Figure A.3 – Torch for tungsten inert gas
arc welding
Figure A.4 – Torch for plasma arc welding
23*
8
24*
7
8
6
7
25*
22*
26* 27*
1192016
IEC 1461/99
28*
* If necessary
IEC 1462/99
Figure A.5 – Torch for plasma cutting Figure A.6 – Supply unit
60974-7 IEC:2005 – 49 –
6 1 19 20 16 Figure A.7 – Mechanically guided plasma torch
NOTE For explanation of numbered items in the figures, see Table A.1.
IEC 1159/05
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