NCCER Millwright Practice Exam

What is the recommended angle for holding an oxyfuel torch when cutting thin steel?

1. 45 degrees

2. 15-20 degrees

3. 90 degrees

4. 30-35 degrees

The correct answer is: 15-20 degrees

When cutting thin steel with an oxyfuel torch, holding the torch at an angle of 15 to 20 degrees is recommended for optimal performance. This angle allows for better control over the cutting process, ensuring that the flame penetrates the metal evenly. It also helps in managing the heat distribution, which is particularly important when working with thinner materials. Holding the torch at a steeper angle could lead to excessive heat concentration in a small area, potentially causing warping or burning through the material. Conversely, a flatter angle may not provide sufficient heat to initiate or sustain the cutting process. By maintaining this 15 to 20-degree angle, operators can achieve cleaner cuts and improved overall efficiency when working with thin steel surfaces.