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Scottish chemist and physician Joseph Black first identified carbon dioxide in the 1750s.
CO2 is commonly used as a shielding gas in welding operations. This process is known as Metal Active Gas (MAG) welding (as opposed to Metal Inert Gas, or MIG, welding) since CO2 is an active gas. It is typically used when welding carbon and low-alloy steels ranging from 16 gauge (0.059 inch) to 1/4 inch (6 mm) or heavier. The process results in deeper penetration and slightly more spatter than similar processes using argon or argon mixtures.
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