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2.2 SAFETY PRECAUTIONS
Welding power source
Observe the following instructions to
prevent the hazard.
(1)Never use the welding power source for other
thanwelding purpose. (e.g. Never attempt to use
thewelding power source for pipe thawing.)
(2)It is very important to comply with all instructions,
safetywarnings, cautions and notes mentioned.
Failure to do so can result in serious injury or even
death.
(3)Work of driving source at the input side,
selectingwork site, handling, storage and piping of
high pressure gas, storage of welded products and
also disposal of waste should be performed
according to the operating instructions and national,
state and localcodes and regulations.
(4)Prevent any unauthorized personnel to enter in
andaround the welding work area.
(5)Pacemaker wearers should consult their doctor
before going near arc welding. Magnetic fields can
affect pacemakers.
(6)Only educated and/or skilled persons who well
understand this welding power source should
install,operate, maintain and repair the unit.
(7)Only educated and/or skilled persons who well
understand the operating instructions of the unit
andare capable of safe handling should perform
operation of the unit.
Against electric shock
Observe the following instructions to
prevent the hazard.
(1)Do not touch live parts.
(2)Grounding of the case of the welding power and
basemetal or a jig electrically connected to the base
metalmust be performed by educated and/or skilled
persons.
(3)Before installation or maintenance work, turn
offpower at the power box, wait it for at least five
minutes to discharge capacitors. Significant voltage
may exist on capacitors after turning off power at
the power box so it is imperative to check to make
sure that no charged voltage present at capacitors
before touching any parts.
(4)Do not use undersized, worn, damaged or bare
wired cables.
(5)Connect cables firm and insulate connection parts.
(6)Keep all cases, panels and covers securely in
place.
(7)Do not handle the welding power source with torn
orwet gloves.
(8)Wear safety harness in case of working above floor
level.
(9)Turn off all equipment when not in use.
(10)Perform periodic checks without fail and repair or
replace any damaged parts before using the power
source.
Ventilation and protective equipment
Oxygen deficit, fume and gas
(1)When conducting welding in the bottom of the
tank,boiler or hold as well as legally-defined sites,
use a local exhauster specified by the applicable
laws and regulations (occupational safety and
health regulation, rules on preventing suffocation or
etc.) or wear protective breathing gear.
(2)To prevent dust injury or poisoning by the fume
generated during welding, use a local exhauster
specifiedby the applicable law (occupational safety
and healthregulation, rules on preventing injury by
inhaled dustor etc.), or wear protective breathing
gear.
(3)When conducting welding in a confined area,
makesure to provide sufficient ventilation or wear
protective breathing gear and have a trained
supervisorobserve the workers.
(4)Do
not
conduct
degreasing,cleaning or spraying is performed.
Conducting welding near the area where any of
these types of work isperformed can generate toxic
gases.
(5)When welding a coated steel plate, provide
sufficientventilation or wear protective breathing
gear. (Welding of coated steel plates generates
toxic fume and gas.)
Against fire, explosion or blowout
Observe the following cautions to
(1)Remove any combustible materials at and near
thework site to prevent them from being exposed to
thespatter. If they cannot be relocated, cover them
with afireproofing cover.
(2)Do not conduct welding near combustible gases.
(3)Do not bring the hot base metal near combustible
materials immediately after welding.
(4)When welding a ceiling, floor or wall, remove all
flammables including ones located in hidden
places.
(5)Properly connect cables and insulate connected
parts. Improper cable connections or touching of
cables to any electric current passage of the base
metal, such as steel beam, can cause fire.
(6)Connect the base metal cable at a section closest
tothe welding part.
(7)Do not weld a sealed tank or a pipe that contains
agas.
(8)Keep a fire extinguisher near the welding site for
anemergency.
III
generated during welding can be
hazardous.
welding
at
a
prevent
fires
explosion
blowout.
site
where
or
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