To extinguish an oxyfuel cutting torch what should be shut down first? oxygen fuel gas air shielding gas

## Step 1<br />The oxyfuel cutting process involves the use of a torch that combines fuel gas and oxygen to produce a flame hot enough to melt the metal being cut. The fuel gas is the source of the heat, while the oxygen supports the combustion process.<br />## Step 2<br />When shutting down the torch, it is crucial to first shut off the fuel gas. This is because the fuel gas is the source of the heat and, if not shut off first, could cause a flashback or backfire.<br />## Step 3<br />A flashback or backfire occurs when the flame travels back into the torch, potentially causing damage to the torch and posing a safety risk. Therefore, the correct answer is to shut off the fuel gas first.