What is the primary function of a cutting torch?

The primary function of a cutting torch is to cut metal using a flame. The cutting torch utilizes a high-temperature flame produced by the combustion of oxygen and a fuel gas, typically acetylene. This intense heat rapidly raises the temperature of the targeted metal to its ignition point, allowing it to burn in a reaction with the oxygen.

As the flame is directed onto the metal, it not only melts the material but also allows for a controlled oxidation process, which effectively separates the metal into two pieces. This method is widely used in various industries for its efficiency in cutting through thick and thin materials alike.

Other options, such as fusing materials together or heating metal for bending, pertain to different processes like welding or heating tasks, which do not match the primary function of a cutting torch. Cooling metal after cutting is irrelevant to the cutting process itself, as it would not be a function of the torch but rather a post-processing step.