What is the name of the loud snap or pop occurring when a torch flame is extinguished?

The term for the loud snap or pop that occurs when a torch flame is extinguished is known as backfire. This phenomenon occurs due to a sudden change in the combustion process, often caused by a sudden reduction in oxygen supply or flow of fuel. When the flame is abruptly extinguished, unburned fuel may ignite momentarily, creating a loud noise. This is particularly common in oxy-fuel welding and cutting operations, where maintaining the correct balance of fuel and oxygen is critical to prevent disturbances in the flame.

Understanding this term is essential for safety in welding and cutting operations, as experiencing backfire can indicate improper handling or adjustment of the torch, which may lead to hazardous situations if not addressed. Familiarity with such terminology is crucial for anyone working in environments involving torch flames, ensuring a safer and more controlled approach to welding practices.