In a flashback, where does the flame burn into or beyond?

In the context of a flashback during brazing, the flame burns into or beyond the mixing chamber. This occurs when the flame travels back along the gas line and into the area where the fuel gas and oxygen are mixed. The mixing chamber is a critical component because it is where the gases come together before being ignited at the torch tip. If a flashback occurs, it indicates that there's potentially unsafe behavior or equipment failure, prompting the flame to go against the intended flow and travel into this area.

This situation is dangerous, as it can lead to an explosion or combustion hazard. Proper equipment maintenance, including flashback arrestors, is essential to prevent the flame from entering the mixing chamber and causing serious accidents. Understanding this aspect of brazing safety can significantly reduce risks associated with using torches and handling flammable materials.