What method is used for cutting metal using heat?

The method used for cutting metal with heat is the cutting torch. A cutting torch typically employs a mixture of gases, commonly oxygen and acetylene, to produce an extremely hot flame capable of melting metal. This process is known as oxy-fuel cutting, where the heat generated allows for effective cutting through various types of metals. The torch can be adjusted to control the size of the flame and the speed of the cut, making it a versatile tool for both straight cuts and intricate designs.

While options like the plasma cutter also use heat to cut metal, they do so through ionizing gas, resulting in a different method of operation compared to a cutting torch. A welding machine is mainly used for joining metal pieces together rather than cutting, and a band saw is designed for making precise cuts but relies on mechanical means rather than heat for cutting through metal. This emphasizes why the cutting torch is specifically recognized for its capability in heating and cutting metal effectively.