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an arc is struck. Looking at an arc momentarily with unprotected eyes
(particularly high intensity gas-shielded arc) can cause a retinal burn that may
leave a permanent dark area in the field of vision. Before welding whilst
wearing contact lenses, seek advice from your optician.
PROTECTION OF NEARBY PERSONNEL
For production welding, a separate, well vented room or enclosed bay is best.
In open areas, surround the operation with low reflective, non- combustible
screens or panels. Allow for free air circulation, particularly at floor level.
Provide face shields for all persons who will be looking directly at the weld.
Others working in the area should wear flash goggles. Before starting to weld,
make sure that screen or bay doors are closed.
SHOCK PREVENTION
Exposed live conductors or other bare metal in the welding circuit, or in
unearthed, electrically-LIVE equipment can fatally shock a person whose
body becomes a conductor.
DO NOT
STAND, SIT, LIE, LEAN ON, OR TOUCH a
wet surface when welding without suitable protection.
PROTECTION FOR WEARERS OF ELECTRONIC LIFE SUPPORT DEVICES
(PACEMAKERS)
Magnetic fields from high currents can affect pacemaker operation. Persons
wearing pacemakers should consult with their doctor before going near arc
welding or spot welding operations.
PROTECTION AGAINST SHOCK
Keep your body and clothing dry.
NEVER
work in damp area without
adequate insulation against electric shock. Stay on a dry duckboard or rubber
mat when dampness or sweat can not be avoided. Sweat, sea water, or
moisture between body and an electrically LIVE part - or earthed metal -
reduces the body surface electrical resistance, enabling dangerous and
possibly lethal currents to flow through the body.
EARTHING THE EQUIPMENT
When arc welding equipment is earthed according to the National Electrical
Code and the workpiece is earthed, a voltage may exist between the
electrode and any conducting object.
Examples of conducting objects include, but are not limited to, buildings,
electrical tools, work benches, welding power source cases, workpieces, etc.
NEVER
touch the electrode and any metal object unless the welding power
source is off. When installing, connect the frames of each unit such as welding
power source, control, work table, and water circulator to the building earth.
Conductors must be adequate to carry earth currents safely. Equipment
made electrically live by stray current may shock, possibly fatally.
DO NOT
EARTH to electrical conduit or to a pipe carrying ANY gas or a flammable
liquid such as oil or fuel.
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