GMAW uses which combination to shield the weld?

• A. Coated Flux
• B. Shielding Gas with Wire Electrode
• C. Pressurized Air Only
• D. None (no shielding)

Answer: (B)

GMAW relies on a shielding gas combined with a continuously fed wire electrode to protect the weld. The shielding gas blankets the arc and molten weld pool from the surrounding air, preventing contamination by oxygen, nitrogen, and moisture that would cause porosity and weak welds. The wire provides the filler metal while the gas keeps the weld environment inert or reducing, which helps control penetration and bead shape. Flux-coated or flux-core methods rely on flux for shielding, or rely on ambient air with no shielding, which is not how GMAW operates. Therefore, the correct concept is shielding gas with the wire electrode.