Rare gases Argon plays an increasing role as welding technologies expand. It is the shielding-gas-of-choice for many electric arc welding applications, either pur, or more commonly, in mixtures with helium, carbon dioxide and oxygen. In GMAW (MIG) welding, the argon is mixed to suit the characteristics needed to weld the particular metal, whether it be mild steel, stainless steel, aluminum or copper. Argon also is the most popular shielding gas for welding.
Argon is an inert gas that cannot be sensed by odor, color or taste. It is difficult to know when argon is present and may be depleting oxygen for breathing. It must be used in well ventilated areas. Efforts must always be made to avoid leaks or venting of these gases in confined space.
Do not work with any inert gases in confined spaces such as tanks, pits or tunnels unless an adequate breathing air supply is available. Always provide good ventilation in enclosed areas where gases may be present.
Liquid or cold gas argon can cause frostbite-type burns. Protect eyes and skin from exposure to these low temperature materials. Wear protective goggles, gloves and clothing where cold liquid might be spilled.
Use correct pressure reducing equipment when using gas from high pressure steel cylinders.
