What control allows gas coolant to flow after the arc is extinguished?

• A. Post-Flow Control
• B. Pre-Flow Control
• C. Post-Arc Control
• D. Flow-After Control

Answer: (A)

Shielding gas timing is what this item tests: the gas should continue to blanket the weld after the arc is extinguished. This short post-arc flow protects the molten metal as it begins to cool and solidify, preventing air from causing oxidation and porosity and helping the weld quality stay consistent. Pre-flow timing covers gas before the arc starts to purge and establish coverage, but it doesn’t address protection after the arc ends. The other terms aren’t standard ways to describe continuing gas flow after the arc, so post-flow control is the clear concept that fits.