djm direct DJMMIG195 Podręcznik - Strona 5

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apron, and fire-resistant leggings. Avoid outer garments of untreated

cotton. Bare skin protection: Wear dark substantial clothing, Button

collar to protect chest and neck and button pockets to prevent entry

of sparks.

b) Eye and head protection

Protect eyes from exposure to arc. NEVER look at an electric arc

without protection. Welding helmet or shield containing a filter plate

shade no. 12 or denser must be used when welding. Place over face

before striking arc. Protect filter plate with a clear cover plate.

Cracked or broken helmet or shield should NOT be worn; radiation

can pass through to cause burns. Cracked, broken, or loose filter

plates must be replaced IMMEDIATELY. Replace clear cover plate

when broken, pitted, or spattered. WE SUGGEST you wear flash

goggles with side shields under the helmet, to give some protection

to the eyes should the helmet not be lowered over the face before an

arc is struck. Looking at an arc momentarily with unprotected eyes

(particularly a 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.

c) Protection of nearby personnel

For production welding, a separate 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.

5.3.2 Toxic fume prevention

Comply with precautions in 2B. Generator engine exhaust must be

vented to the outside air. Carbon monoxide can kill.

5.3.3 Fire and explosion prevention

Comply with precautions in 2C. Equipment's rated capacity. Do not

overload arc welding equipment. It may overheat cables and cause a

fire. Loose cable connections may overheat or flash and cause a fire.

Never strike an arc on a cylinder or other pressure vessel. It creates a

brittle area that can cause a violent rupture or lead to such a rupture

later under rough handling.

5.3.4 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.

5.3.5 Protection for wearers of electronic life supp't devices

(pacemakers)

Magnetic fields from high currents can affect pacemaker operation.

Persons wearing electronic life support equipment (pacemaker)

should consult with their doctor before going near arc welding,

gouging, or spot welding operations.

5.3.6 To protect against shock:

Keep body and clothing dry. Never work in damp area without

adequate insulation against electrical 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.

a) 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.

b) Electrode holders

Fully insulated electrode holders should be used. Do NOT use holders

with protruding screws or with any form of damage.

c) Connectors

Fully insulated lock-type connectors should be used to join welding

cable.

d) Cables

Frequently inspect cables for wear, cracks and damage.

IMMEDIATELY REPLACE those with excessively worn or damaged

insulation to avoid possibly lethal shock from bared cable. Cables

with damaged areas may be taped to give resistance equivalent to

original cable. Keep cable dry, free of oil and grease, and protected

from hot metal and sparks.

e) Terminals and other exposed parts

Terminals and other exposed parts of electrical units should have

insulating covers secured before operation.

f) Electrode

a) Equipment with output on/off control (contactor) Welding power

sources for use with the gas metal arc welding, gas tungsten arc

welding and similar processes normally are equipped with devices

that permit on/off control of the welding power output. When so

equipped the electrode wire becomes electrically LIVE when the

power source switch is ON and welding gun switch is closed. Never

touch the electrode wire or any conducting object in contact with the