What part of a torch can cause a flashback if improperly assembled?

The part of a torch that can cause a flashback if improperly assembled is the seal rings. Seal rings play a crucial role in maintaining the integrity of the connections within a torch system. Their primary function is to ensure there is a proper seal between different components, preventing gas leaks that can lead to dangerous situations.

If the seal rings are not installed correctly or if they are damaged, the torch may experience gas leakage. If flammable gas leaks and comes into contact with an ignition source, it can lead to a flashback, where the flame travels back into the gas supply, potentially causing a hazardous situation. Proper sealing is therefore vital not only for safety but also for the efficient operation of the torch.

While hoses, the gas mixing chamber, and fittings are important components and can contribute to the overall safety and functionality of the torch, it is the seal rings that specifically have a direct connection to preventing flashbacks through their role in maintaining secure and leak-proof connections.