Which welding process uses a flux-cored wire?

• A. TIG welding
• B. MIG welding
• C. FCAW (Flux-Cored Arc Welding)
• D. Stick welding

Answer: (C)

Flux-Cored Arc Welding (FCAW) specifically utilizes a flux-cored wire, which distinguishes it from other welding processes. In FCAW, the wire is tubular and filled with flux material that generates gases and slag when heated, helping to protect the weld pool from contamination. This flux also serves to provide additional deoxidizers and alloying elements as the wire melts, leading to more robust welds.

FCAW can be performed with or without shielding gas, which enhances versatility in different environmental conditions. For instance, when welding outdoors or in windy conditions, FCAW performs effectively as the flux creates a shielding effect, while traditional MIG processes typically require shielding gas that can be blown away by the wind.

In contrast, TIG welding employs a non-consumable tungsten electrode and filler material that is separate from the welding arc, while MIG welding utilizes a solid wire fed through a welding gun along with an external shielding gas. Stick welding, or Shielded Metal Arc Welding (SMAW), uses consumable electrodes coated in flux, but does not use a tubular wire like FCAW. Thus, the defining aspect of FCAW being the flux-cored wire makes it the correct answer.