Which statement describes FCAW?

• A. It uses a flux-core tubular wire
• B. It uses a nonconsumable tungsten electrode
• C. It requires no shielding gas
• D. It cannot be used outdoors

Answer: (A)

FCAW is defined by using a flux-core tubular wire as the electrode. As the wire melts, the flux inside provides shielding from the atmosphere and forms slag to protect the weld. There are two main variants: self-shielded FCAW, which relies on the flux to shield the weld and doesn’t require an external shielding gas, and gas-shielded FCAW, which uses shielding gas supplied from a separate source. Because shielding needs vary by variant, claiming that no shielding gas is ever required isn’t universally true. The description about a nonconsumable tungsten electrode points to TIG welding, not FCAW. The idea that FCAW cannot be used outdoors is incorrect; FCAW, especially the self-shielded type, is commonly used for outdoor field welding. So the statement that best describes FCAW is that it uses a flux-core tubular wire.