What is the purpose of flashback arrestors in welding?

Flashback arrestors are critical safety devices utilized in welding to prevent dangerous situations. Their primary function is to stop the flames from traveling back into the gas supply lines and cylinders, which could result in explosive hazards or cylinder rupture. When a flashback occurs, the fire can move backward through the hose towards the gas source. Flashback arrestors contain mechanisms like check valves and flame traps that effectively intercept and extinguish the flame before it can reach the cylinders.

Understanding the roles of the other options can clarify why they are not correct. Amplifying the flame output, cooling the gas before it reaches the torch, or filtering the gas used in welding does not align with the primary safety function provided by flashback arrestors. Their design and purpose are specifically tailored to maintaining safe working conditions by preventing potential fire hazards associated with gas welding activities.