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1 - SAFETY PRESCRIPTIONS FOR ARC WELDING GENERATORS
The Safety Prescriptions given in this manual do not replace but summarise the obligations for compliance with the current
safety and accident-prevention regulations. Before install, operate or maintain the welding equipment, read and understand
carefully the current safety and accident-prevention regulations.
In any case, the personnel involved in the use of the welding machine must be adequately trained with regard to use of the
machine and observance of the fundamental welding rules.
Setting up of the work area must comply with certain fundamental principles. Basic safety of persons and things depends on
the observance of these minimum requires.
Personal Protection
The skin or eyes burns resulting from the exposure to the electric arc welding radiations or metal fusion can bring more
dangerous effects than sunburn. Therefore:
a) Use a protection mask equipped with the respective inhatinic filter to protect the eyes, face, neck and ears from the
projections and the arc welding radiation. Prevent the persons near the welding places of the negative effects provoked by the
arc welding radiations or metal fusion.
b) Use non-inflammable gloves, long sleeves shirt, trousers without folds, boots, welding mask, apron and hat to protect the
hair. These protections are needed to insure that the skin stays protected from the referred radiations.
Avoid using clothes with pockets or folds so that in case of occurring any projection of hot metal these will not deposit in the
clothe's folds or pockets.
c) To protect the persons near the welding place, separations of non-inflammable curtains ought to be installed.
d) Always use safety glasses when standing in a place where metal projections can occur. Persons that circulate in the
working area ought to use safety glasses.
Preventing Fires
The projections can cause fires when in contact with combustible substances, liquids or gaseous. Therefore:
a) Every combustible material must stay far from the working place. When possible the combustible materials must be
covered with non-inflammable covers. These materials include wool, clothes, sawdust, natural gas, acetylene, propane and
similar materials.
b) The metal projections can penetrate in wall or floor cracks causing non detectable latent fire. These cracks must be
conveniently protected from the metal fusion projections.
c) Welding, cutting or any kind of hot operation should not be made in recipients, deposits, tanks or other kind of used
containers that haven't been carefully cleaned from substances that can produce toxic or inflammable vapours.
d) For protection against fire must exists a fire extinguisher system nearby, that can be used quickly like a water hose, a water
recipient, sand or a portable extinguisher.
e) Once the welding operations are concluded, the working area must be inspected to insure the absence of metal fusion
projections that can cause further fires.
Electric Discharge
Burns or mortal electrocution can be caused by 110 voltages or less. The gravity of this kind of discharges is determined by
the intensity of electric current that passes through the human body. Therefore:
a) Do not permit contact of the skin with metal pieces or even the use of wet or humid clothing. Wear only well dry gloves.
b) If it's really needed to make welding operations in humid places the operators must wear very well dry gloves, rubber
shoes or boots and stepping the dry floor in order to be isolated from the electric current.
c) The welding machine must be connected to an electrical board equipped with an appropriate differential and earth
connection. The earth connection wire's section must be correct according the norms about electric cables.
d) Do not use damaged welding cables. Do not overload the cable. Cable extensions or connections must be always correctly
isolated.
e) The equipment must remain disconnected when not in use because an accidental electrical discharge can cause overheating
and provoke a fire. Do not roll the welding cable around the body.
f) The earth cable must be connected to the welding piece closest from the welding area. Welding current must pass through
metallic elevations or crane cables if long distance earth cable connections are made.
Ventilation
The smoke produced by the welding, mainly in closed spaces can provoke irritations if breathed during a long period of time.
a) Always take special care having proper ventilation in the welding places by the means of natural or forced ventilation
systems. Do not weld over zinc galvanised materials, cadmium, lead or beryllium, without prevent the needed ventilation to
avoid smoke provoked by the welding of these materials.
b) Do not weld near places containing chlorinated hydrocarbon vapours resultants from degreasing operations. Reactions can
be provoked from the vapours of dissolvents with the resultant heat of electric welding arc producing toxic or irritating gas.
c) Eye, nose or throat irritations during the welding process means that the ventilation system isn't proper. In this case the
ventilation should be increased in the welding area. Stop the welding operation if the irritations persist.
Equipment maintenance
The quality of the welding process depends on the good condition of the welding equipment. To maintain it's good condition
and protect the operator, maintenance reviews should be made periodically. If reviews aren't made, accidents can occur due
to fire or electric discharges. Therefore:
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