Theoretically, the occurrence of tempering is that acetylene is mixed in the oxygen system or oxygen is mixed in the acetylene system. The combustion speed of the mixed gas of oxygen and acetylene is very fast, which exceeds the combustion speed of the mixed gas of oxygen and acetylene at work, so that the flame burns into the welding torch and cutting torch to form tempering.

Don't panic when tempering, quickly close the acetylene and oxygen valves, open the oxygen valve after tempering is extinguished, and blow out the residual flame and soot in the welding torch.