If the bead is shiny and clean, what does it indicate about gas flow and metal cleanliness?

• A. Poor gas flow and dirty metal
• B. Inconsistent current
• C. Correct gas flow and clean metal
• D. Excess filler

Answer: (C)

A shiny, clean weld bead shows that the weld pool is being protected by the shielding gas and the base metal is free from contaminants. When shielding gas covers the weld properly, oxidation and atmosphere-related flaws are prevented, so the bead forms a bright, smooth surface. A clean metal surface also fuses consistently, contributing to that bright appearance. If gas flow were poor or the metal were dirty, you’d likely see a duller, discolored, or porous bead. Inconsistent current usually causes irregular bead shape or penetration, not a uniformly bright finish, and excess filler would create an overly large or raised bead with potential roughness. So the bright, clean bead best indicates correct gas flow and clean metal.