Flame temperatures

Last updated April 6, 2005.

Flame temperature is not as simple as it sounds. It depends on many factors, such as:

Sites discussing practical welding and similar tasks tend to give much lower numbers than science-oriented sites, probably because of rapid heat loss in typical use. A number of sites warn that measurements done with thermocouples can be wildly inaccurate. More definitive information is available in the North American Combustion Handbook.

As a general practical guideline, consider one site's list of these heats for their jewelers' (gas/oxygen) torch:

For their fuel/air torch they list: