How Hot Is a Cutting Torch?

Propane/Air Torches

• Propane torches, which use a mixture of propane and air, reach around 1,900°C (3,550 °F). These are usually used to cut and weld softer metals, such as copper.

Propane/Oxygen Torches

• Some cutting and jewelers' torches use a mixture of propane and pure oxygen. The flames burn hotter at about 2,200 °C (3,990 °F). Propane and oxygen mixes are best used when temperatures in the work area are low.

Acetylene/Oxygen Torches

• For the most difficult cutting jobs, welders often use the two-tank mixture of acetylene and oxygen. The flames burn at about 3,300 °C (5,970 °F), according to DeRose.net. At these temperatures, the flame can cut through iron and steel.