Argon, helium, carbon dioxide, and nitrogen are
commonly used shielding gases in electric welding and cutting processes. These
inert, colorless, odorless and tasteless gases cannot be detected by the human
senses. They can displace the oxygen required for normal breathing. An
atmosphere with less that 18% oxygen can cause dizziness, unconsciousness, or
even death. This can happen without any warning signs.
Therefore, be aware of
the following precautions:
Make sure a confined area is well ventilated before
entering. If there is doubt, check area with an oxygen analyzer to be sure it
contains a life supporting atmosphere. Otherwise wear an air supplied
respirator. A second person, similarly equipped, should be standing by. Even if
the amount of oxygen is sufficient at the start of welding, shielding gases
formed during welding may displace enough oxygen to create a dangerous
situation. Monitor oxygen level throughout welding.
Do not bring cylinders of shielding gas into
confined areas.
Do not leave shielding gas equipment in confined
areas when not in use.
Treat pits, tank bottoms, ceilings, etc., as
confined areas. Shielding gases are heavier or lighter than air and may
displace breathing air in those areas.
Hydrogen is a flammable gas. A mixture of this gas
with oxygen or air in a confined area will explode if ignited by a spark.
Hydrogen is also a colorless, odorless and tasteless gas which can act as a
asphyxiate. Being lighter than air, hydrogen can accumulate in upper portions
of confined areas.
For more safety information on these gases, contact
your gas supplier.
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