General Welding Safety Precautions
General Welding Safety Precautions
General Welding Safety Precautions
GENERAL
operations. During all oxyacetylene welding and
cutting proccesses, operators must use safety
goggles to protect the eyes from heat, glare, and
flying fragments of hot metals. During all electric
welding processes, operators must use safety
goggles and a hand shield or helmet equipped
with a suitable filter glass to protect against the
intense ultraviolet and infrared rays. When others
are in the vicinity of the electric welding
processes, the area must be screened so the arc
cannot be seen either directly or by reflection
from glass or metal.
2.
PROTECTIVE EQUIPMENT
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the shade
NOTE
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Flameproof
gauntlet
gloves,
preferably of leather, should be worn to
protect the hands and arms from rays of
the arc, molten metal spatter, sparks,
and hot metal. Leather gloves should be
of sufficient thickness so that they will
not shrivel from the heat, burn through,
or wear out quickly. Leather gloves
should not be used to pick up hot items,
since this causes the leather to become
stiff and crack. Do not allow oil or grease
to cane in contact with the gloves as this
will reduce their flame resistance and
cause them to be readily ignited or
charred.
Prepared by : Farid Moch. Zamil
18 September 2009
3.
FIRE HAZARDS.
Fire prevention and protection is the
responsibility of welders, cutters, and
supervisors. Approximately six percent of
the fires in industrial plants are caused
by cutting and welding which has been
done primarily with portable equipment
or in areas not specifically designated for
such work. The elaboration of basic
precautions to be taken for fire
prevention during welding or cutting is
found in the Standard for Fire Prevention
in Use of Cutting and Welding Processes,
National Fire Protection
Association
Standard 51B, 1962. Some of the basic
precautions for fire prevention in welding
or cutting work are given below.
4.
Whenever
possible,
flammable
materials
attached
to
or
near
equipment requiring welding, brazing,
or cutting will be removed. If removal is
not practical, a suitable shield of heat
resistant material should be used to
protect the flammable material. Fire
extinguishing equipment, for any type
of fire that may be encountered, must
be present.
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Atomspheric conditions.
Generated heat.
NOTE
Where welding operations are incidental to
general operations, it is considered good
practice to apply local exhaust ventilation to
prevent contamination of the general work
area.
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WARNING
CONTAINS CADMIUM - POISONOUS
FUMES MAY BE FORMED ON HEATING
Reqd ventilation
(cfm)
3500
4500
Rod diameter
(inches)
Minimum rate.
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2. Fixed enclosure.
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3. Self-contained units.
In areas immediately hazardous to life,
hose masks with blowers or selfcontained breathing equipment shall be
used. The breathing equipment shall be
approved by the US Bureau of Mines or
National Institute of Occupational Safety
and Health, or other governmentapproved testing agency.
4. Outside helper.
Where welding operations are carried on
in confined spaces and where welders
and helpers are provided with hose
masks, hose masks with blowers, or selfcontained breathing equipment, a worker
shall be stationed on the outside of such
confined spaces to ensure the safety of
those working within.
5. Oxygen for ventilation.
Oxygen must
ventilation.
never
be
used
for
2. Airline respirators.
In
circumstances
where
it
is
impossible
to
provide
adequate
ventilation in a confined area, airline
respirators or hose masks, approved
by the US Bureau of Mines, National
Institute of Occupational Safety and
Health,
or
other
governmentapproved testing agency, will be used
for this purpose. The air should meet
the standards established by Public
Law 91-596, Occupational Safety and
Health Act of 1970.
Prepared by : Farid Moch. Zamil
4.9 Zinc.
Indoors, welding or cutting involving zincbearing metals or filler metals coated with
zinc-bearing materials shall be done in
accordance with paragraph 2-4 g.
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4.10 Zinc.
1. Indoors.
Indoors, welding involving leadbase metals shall be done in
accordance with paragraph 2-4 g,
local exhaust ventilation.
2. Local ventilation.
In confined spaces or indoors,
welding or cutting involving metals
containing lead or metals coated
with
lead-bearing
materials,
including paint, shall be done using
local exhaust ventilation or airline
respirators.
Outdoors,
such
operations shall be done using
respirator
protective
equipment
approved by the US Bureau of
Mines,
National
Institute
of
Occupational Safety and Health, or
other government-approved testing
agency. In all cases, workers in the
immediate vicinity of the cutting or
welding operation shall be protected
as necessary by local exhaust
ventilation or airline respirators.
NOTE
Cadmium-free rods are available and can be
used in most instances with satisfactory
results.
4.13 Mercury.
4.11 Beryllium.
10
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Degreasing
or
other
cleaning
operations
involving
chlorinated
hydrocarbons will be located so that
no vapors from these operations will
reach or be drawn into the area
surrounding any welding operation.
In addition, trichloroethylene and
perchloroethylene should be kept
out of atmospheres penetrated by
the ultraviolet radiation of gas
shielded welding operations.
5.
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