What condition is caused when a flame burns back into the tip of a torch and creates a high-pitched whistling sound?

A flashback occurs when the flame travels back through the torch and into the hose, producing a high-pitched whistling sound. This phenomenon is often indicative of improper gas flow, a blocked torch tip, or a malfunctioning regulator, which can lead to dangerous situations if not addressed promptly. Recognizing a flashback is crucial for safety while working with gas torches since it can result in a fire if the flame enters the hose. Understanding the mechanics of a flashback is vital for boilermakers and other professionals who rely on torch work to ensure safe practices and functioning equipment.