What is referred to as the recession of the flame into the mixing chamber of the torch?

The term describing the recession of the flame into the mixing chamber of the torch is known as a flashback. This occurs when the flame travels back into the torch or the mixing chamber, often due to certain unfavorable conditions such as insufficient gas flow or a temperature increase.

A flashback can be dangerous because it can lead to the ignition of gases in the torch, potentially causing damage or an explosion. Proper use of equipment, including ensuring that hoses are in good condition and maintaining the correct pressure and flow of gases, helps prevent flashbacks.

Understanding this phenomenon is crucial for pipe fitters, as it directly relates to the safe operation of gas torches used in various applications like welding or cutting. Recognizing the signs of a flashback and knowing how to respond appropriately can help maintain safety standards on the job.