What type of gas is commonly used in the plasma arc cutting process along with electrical power?

In the plasma arc cutting process, argon or nitrogen is commonly used as the plasma gas alongside electrical power. These gases serve a critical role in creating the plasma column which is essential for cutting through metals. When an electric arc is established between the electrode and the workpiece, the gas becomes ionized and transforms into plasma, allowing for high-temperature cutting.

Argon, being an inert gas, helps in stabilizing the arc and is particularly beneficial when cutting materials that might react negatively with other gases. Nitrogen can also be used, especially for cutting stainless steel or other alloys because it can help to produce a cleaner edge by minimizing oxidation during the cutting process.

Other gases such as oxygen and acetylene do not fulfill the same role in plasma cutting. While oxygen can be used in certain cutting processes (like oxy-fuel cutting), it is not suitable for plasma arc cutting, where maintaining the integrity of the plasma column is essential. Carbon dioxide may find applications in other welding processes but is not typically used as a plasma gas in this context. Therefore, argon and nitrogen are the preferred gases due to their ability to support the efficient and effective cutting operation in plasma arc cutting.