What is the purpose of using a gas mixture in some PAC units?

Using a gas mixture in some Plasma Arc Cutting (PAC) units primarily serves to enhance the stability of the cutting arc. The stability of the plasma arc is crucial for achieving clean and precise cuts in various materials. By utilizing a mixture of gases, such as argon and hydrogen or nitrogen, the properties of the plasma can be tailored to better support the arc. A stable arc creates a consistent energy concentration, allowing for improved penetration and control during cutting. Additionally, the right gas mix can help to optimize the thermal properties and ionization characteristics of the arc, further contributing to effective cutting performance.

Options that suggest gas mixtures are used for visual effects, drastic speed increases, or cost reduction do not accurately reflect the technical function that gas mixtures serve in maintaining an effective and reliable cutting process.