FCAW (Flux cored arc welding) is a process that uses continuously fed welding consumables, with flux at its core.
There are two varieties, one with no shielding gas and the other with shielding gas, with the latter being more predominant. In self-shielding, continuous tubular wire filled with flux is used in spool form. The wire is fed continuously in to the arc by means of a special wire feeder. The arc is struck by applying wire on to the job. The heat of the arc melts the wire and forms a weld puddle. The flux core essentially has the same functions as external coating on a stick electrode.
The other alloying elements added in the flux, provides desired mechanical properties to the weld metal. The self-shielding flux-cored arc welding process is popular in fabrication, reclamation welding, hard facing and surfacing applications.