Millwright Level 1 Exam 2026 – 400 Free Practice Questions to Pass the Exam

In plasma arc cutting, the primary role of the secondary gas is to enhance the cutting process by stabilizing the arc. While cooling the torch is an important function in many cutting applications, in the context of plasma arc cutting, the secondary gas actually plays a more critical role in stabilizing and maintaining the arc created between the electrode and the workpiece.

When the plasma arc is initiated, the secondary gas, often air or nitrogen, is introduced to help create a more controlled and stable arc. This stability is essential for achieving a consistent and precise cut, as fluctuations in the arc can lead to poor cut quality and increased wear on the equipment. Moreover, a stable arc allows for better energy transfer and cutting efficiency.

The secondary gas can also contribute to the gas flow and assist in the expulsion of molten material from the cut, but its primary importance lies in ensuring that the arc remains stable throughout the cutting process.