Flux-cored welding wire provides filler metal for FCAW (flux-core arc welding) tasks. The wire's flux core contains chemicals that help deoxidize the workpiece material, stabilize the welding arc, reduce spatter, increase the strength or ductility of the wire, and protect the weld pool from contaminants during welding. Also known as welding wire or filler wire, this wire typically comes on a coil or spool and is fed through a compatible welding gun. An arc is created between the wire and a workpiece, and the heat from the arc melts and fuses material from the workpiece and the wire to create a weld.