What is the typical maximum temperature of an oxy-acetylene flame in gas welding?
3100 degree Celsius
In gas welding the flame temperature depends on the fuel gas and the oxidiser, and the oxy-acetylene combination gives the hottest flame of the common fuel gases.
Acetylene has a high heat of combustion, and burning it with pure oxygen concentrates that heat into a small, intense inner cone.
A correctly set neutral oxy-acetylene flame reaches a peak temperature of about 3100 °C at the tip of that inner cone.
This is high enough to quickly melt steel and form a fusion weld pool, which is why oxy-acetylene became the standard gas-welding flame.
The figures 2000 °C and 2400 °C correspond to cooler fuel-gas flames such as oxy-hydrogen or oxy-LPG, not oxy-acetylene.
Even 2900 °C falls short of the true oxy-acetylene peak, so the maximum temperature is best given as about 3100 °C.
Hence, the answer is 3100 degree Celsius.
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In the flash butt welding:
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