A backfire occurs when the flame momentarily burns back into the __________.

A backfire occurs when the flame momentarily burns back into the torch tip. This situation often arises when there is an improper mix of fuel and oxygen or when there is insufficient gas pressure, which can cause an unstable flame condition. If the flame moves back into the torch tip, it can create a popping noise and may indicate a need to adjust the settings for a correct and stable flame.

Understanding the mechanics of the torch and its components is crucial for safe operation. The torch tip is where the mixing of gases occurs, and any interruption or abnormal condition in this area can trigger a backfire. Recognizing the signs of a backfire and knowing how to respond is essential for ensuring safe brazing practices.