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The employer is required to evaluate the
risks to which workers are exposed during the
use of welding machines, focusing in particu-
lar on the risks deriving from the welding of
stainless steel alloys. In relation to the legisla-
tion in force in the country where the welding
machines are sold, the employer who uses
the welding machines to weld stainless steel
alloys is required to evaluate the carcinogenic
risk deriving from the development of welding
fumes containing nickel and hexavalent chro-
mium in gaseous form (remember that nickel
and hexavalent chromium in the gaseous state
are carcinogenic).
2.3 SAFETY INSTRUCTIONS
For your safety, before connecting the source
to the line, closely follow these instructions:
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an adequate two-pole switch must be in-
serted before the two-pole main outlet; this
switch must be equipped with time-delay fu-
ses and it must match the data specified in
the chapter "Technical Specification";
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the mono-phase connection with ground
must be made with a two-pole plug compati-
ble with the above mentioned socket;
- two wires of the two-pole input cable are
used for the connection with the mono-phase
line and the yellow-green wire for the compul-
sory connection to the ground in the welding
location;
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connect all the metal parts which are near
the operator in the welding location by using
cables bigger or of the same cross section of
the welding cable to a ground terminal;
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when working in a confined space, the po-
wer source must be kept outside the welding
area and the ground cable should be welded
to the workpiece; do not work in a damp or
wet area in these conditions (Fig. 7).
Fig.7
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do not use damaged welding or input ca-
bles (Fig. 8);
Fig.8
- the operator should never touch, with any
part of his body, high temperature or electri-
cally hot metal parts (Fig. 9);
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the operator should never wind the wel-
ding cables around his body;
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the welding gun should never be pointed
at the operator or at another person. The po-
wer source has a protection level IP 22; the-
refore, it prevents:
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any manual contact with hot or moving in-
ternal parts;
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the insertion of any solid body with more
than 12mm diameter;
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protected against vertically falling drops
of water (condensation) with inclination max
of 15°.
The source must never be operated wi-
thout its panels; this could cause serious
injury to the operator and could damage the
equipment itself.
2.4 FIRE PREVENTION
The working area should conform to the Sa-
fety Regulations, and therefore, fire extin-
guishers should be provided in the area
and walls, ceiling and floor should be non-
flammable. All combustible material must
be moved from the welding area (Fig. 10). If
combustibles cannot be moved, they must be
protected with fire-resistant cover. Ventilate
potentially flammable atmospheres before
welding. Never operate in an atmosphere
which contains heavy concentrations of dust,
flammable gas or combustible liquid vapor.
The power source must be located in a safe
area with a firm and flat floor; it should not be
put against a wall. Do not weld containers in
which fuel, lubricant or any other flammable
material have been stored. After having com-
EN-3
Fig.9
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