What does a defined outer envelope in the flame indicate?

A defined outer envelope in the flame indicates that the flame is properly balanced and that combustion is taking place completely. A well-defined flame shape signifies that there is an ideal mixture of oxygen and fuel, ensuring that the combustion process is efficient. This balanced flame allows for optimum temperature and cutting capability, which is crucial for achieving clean and precise cuts in the material.

When the outer envelope is well-defined, it shows that the inner cone of the flame has a stable and consistent shape, which is essential for effective heat transfer to the metal being cut. This stability enhances the overall cutting quality, as the flame can evenly melt the material without causing excessive spatter or uneven cutting edges.