___ and _ flames are used for cutting and welding metals.

Hydrogen

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Oxygen

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Solution

Oxyhydrogen is used in torches to process refractory materials and is used for welding.
An oxyhydrogen torch is an oxy-gas torch that burns hydrogen (fuel) with oxygen (oxidizer).
The heat produced by the oxyhydrogen flame is around 2500⁰C.
At this temperature, the metal easily gets melted and hence it can be cut apart or welded together.
Thus, Hydrogen and Oxygen flames are used for cutting and welding metals.

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