Which statement about flux-cored wire is true?

• A. It requires shielding gas for all metals.
• B. It cannot be used with collision repair welding.
• C. It does not require shielding gas.
• D. It melts at very low amperage

Answer: (C)

Flux-cored wire welding comes in two main varieties: self-shielded and gas-shielded. The self-shielded version carries flux that generates a protective atmosphere as it welds, so no external shielding gas is needed. That makes the statement true for that type because you don’t have to hook up a gas cylinder to protect the weld. The gas-shielded type, by contrast, relies on an external shielding gas (such as CO2 or a CO2-argon mix) to protect the molten weld from the atmosphere, so it does require shielding gas. The other options aren’t universally true: some flux-cored wires do require shielding gas, flux-core welding can be used in collision repair, and melting at very low amperage isn’t a defining trait of flux-cored wire.