FDNY CoF Torch Operations G-60 Practice Exam 2025 - Free G-60 Exam Practice Questions and Study Guide

In oxy-acetylene welding, acetylene gas is a crucial component because it serves as the fuel needed to achieve the high temperatures required for welding processes. When acetylene is mixed with oxygen and ignited, it produces a flame that can reach temperatures of approximately 3,500 degrees Celsius (6,332 degrees Fahrenheit), which is sufficient for melting most metals.

This combination allows for effective fusion of materials, making acetylene an essential part of the oxy-acetylene torch setup. Other gases, such as propane, may be used in different welding applications but do not provide the same level of high-temperature capabilities required specifically for oxy-acetylene processes. Compressed air and pure nitrogen do not play a role in this particular welding method as they do not serve as the fuel gas or oxidizer necessary for creating the intense heat needed for the welding process.