What is the purpose of post-flow during finishing TIG welding?

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Multiple Choice

What is the purpose of post-flow during finishing TIG welding?

Explanation:
The concept being tested is why shielding gas is kept flowing after the TIG arc finishes. Post-flow serves to protect the hot weld and the surrounding heat-affected zone as it cools. Even after you stop the arc, the weld surface is still highly reactive and can oxidize, form porosity, or become discolored if exposed to air. Continuing the shielding gas blankets the area, preventing contamination until the metal has cooled enough to resist oxidation. So, the purpose is to keep protecting the weld after heat is tapered off, not to warm the weld, change gas composition, or rely on rapid cooling with air.

The concept being tested is why shielding gas is kept flowing after the TIG arc finishes. Post-flow serves to protect the hot weld and the surrounding heat-affected zone as it cools. Even after you stop the arc, the weld surface is still highly reactive and can oxidize, form porosity, or become discolored if exposed to air. Continuing the shielding gas blankets the area, preventing contamination until the metal has cooled enough to resist oxidation.

So, the purpose is to keep protecting the weld after heat is tapered off, not to warm the weld, change gas composition, or rely on rapid cooling with air.

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