The Hot Spots

A torch flame has many parts, all with different temperatures. While different gases produce different flames, the hottest point of any flame is at the tip of the inner cone, where the pale flame meets the deeper-colored outer flame.

HOW HOT IS HOT?
HOT 200-400 degrees Fahrenheit Softening paint and putty
350-840 degrees Fahrenheit Soldering: joining metals with a low-temperature metal filler
HOTTER 840-1,500 degrees Fahrenheit Brazing: soldering with hard filler
1,300-1,600 degrees Fahrenheit Cutting steel
HOTTEST 1,250-2,800 degrees Fahrenheit Welding: melting metals (typically aluminum, iron, or steel) together


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