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Flashback
A problem in oxy-gas welding in which the flame burns back into the mixing chamber of the torch. A clogged or overheated tip can cause the flame to disappear from the tip and burn back into the mixing chamber.
A flashback is always accompanied by a shrill hissing or squealing, and the flame does not reappear at the tip as it does with a backfire. Flashback is extremely dangerous, and if the fuel gas, the acetylene or hydrogen, is not turned off at the regulator, the fire can burn back through the hose and cause an explosion.
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- Part of Speech: noun
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