A flashback is a condition in gas welding, when the pure methane gas is used as fuel gas instead of acetylene.(a) True(b) FalseI got this question by my college director while I was bunking the class.Question is taken from Gas Welding topic in chapter Welding and Related Processes of Casting-Forming-Welding II

A flashback is a condition in gas welding, when the pure methane gas i

1.	A flashback is a condition in gas welding, when the pure methane gas is used as fuel gas instead of acetylene.(a) True(b) FalseI got this question by my college director while I was bunking the class.Question is taken from Gas Welding topic in chapter Welding and Related Processes of Casting-Forming-Welding II
Answer» The correct answer is (b) False To explain I WOULD say: In gas welding, a flashback is a condition in which the flame burns inside the gas torch. Flashback is generally caused by improper mixing of GASES, which further INCREASES the rate of flame propagation to high EXTENT that the flame goes back to the mixing chamber. If it is not stopped, the flame may BURN the mixture and may travel back into the cylinder.

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