The weld metal is also shielded from the formation of slag by melting flux. Shieldings gas was used protects the weld pool from oxidation and is usually provided externally from a high-pressure gas cylinder. Based on the shielding method, the FCAW process can be divided into two types One that uses an external shielding gas & one that relies entirely on the flux core itself to protect the weld area. It is similar to MAG welding, except that FCAW welding uses a hollow, tubular electrode filled with flux instead of a solids metal electrode. This arc is struck between the metal workpiece and the continuously fed tubular cord consumable filler wire, in which both the wire and the metal workpiece are joined together to form a weld joint.
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