What is Flashback Arrestor & Importance of Flashback Arrestor. A flashback arrestor, also known as a flash arrestor, is a safety device commonly used in oxy-fuel welding and cutting applications. Its primary function is to prevent flames from traveling back through the hoses and into the gas supply lines, regulators, and even cylinders. This can happen due to various reasons like incorrect gas flow, overheated equipment, or blockages in the torch. Importance of Flashback Arrestor: Flashbacks pos