What type of torch is used for welding and cutting metals with a mixture of oxygen and fuel gas?

The type of torch used for welding and cutting metals with a mixture of oxygen and fuel gas is precisely identified as a welding torch that uses fuel gas and oxygen. This torch operates by combining oxygen with a fuel gas, typically acetylene, to create a flame at a high temperature sufficient for melting and fusing metals.

This process is crucial in both welding and cutting applications: in welding, the high-temperature flame allows for the joining of metal pieces, while in cutting, the intense heat of the flame can effectively melt metal at a controlled rate, allowing for precise cuts. The mixture of gases can be adjusted for different flame types, which is essential for varying tasks in metal fabrication and repair.

Other options do not match the requirements for welding and cutting. A torch that uses only oxygen would not provide the necessary heat as it lacks the fuel gas component required to create a flame. A cutting tool powered by electricity refers to a different technology altogether, such as plasma cutting, which operates on electrical principles instead of a gas mixture. A portable heat source with no specific gas does not relate to welding or cutting processes, as it wouldn’t produce the controlled and high-temperature flame necessary for those metalworking tasks.