Precautions and Safe Practices for Welding - Shielding Gases can cause suffocation without warning



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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