Flux cored arc welding uses heat generated by an electric arc to fuse metal in the weld joint area. This arc is struck between the metallic workpiece and the continuously-fed tubular cored consumable filler wire, with both the wire and the metallic workpiece melting together to form a weld joint. This is similar to MAG welding, except that FCAW welding uses a hollow, tubular electrode filled with flux rather than a solid metal electrode. The FCAW process can be divided into two types depending on the shielding method; one that uses an external shielding gas and one that solely relies on the flux core itself for protecting the weld area. The shielding gas, where used, protects the weld pool from oxidation and is usually provided externally from a high-pressure gas cylinder. Weld metal is also shielded by the slag formation from flux melting. Thus the process informally known as ‘dual shield’ welding and was primarily developed for the welding of structural steels. The most commonly used shielding gases are carbon dioxide or blends of argon and carbon dioxide. The most frequently used blend is 75% argon and 25% carbon dioxide. This dual shield method is preferred for welding thicker materials or for out of position welding. This process, when used in identical settings, delivers welds with more consistent mechanical properties and with fewer defects than with MMA or MAG processes. The continuously fed tubular electrode also allows for higher production rates than with solid wire or stick electrode. However, the gas shielded method may not be suitable for use in windy conditions as the disturbance to gas shielding could result in reduced weld metal properties. The second version of this process doesn’t use an external shielding gas, but instead relies on the protection offered by the flux cored electrode itself. This electrode provides gaseous protection and also forms a slag that covers and protects the molten metal in the weld. The filler wire core contains slag forming fluxing agents and materials that produce shielding gases when burned by the heat of the welding arc. The shielding flux means that this process can be easily used outdoors even in windy conditions without the need of external shielding gas. This makes the process extremely portable and hence suitable for outdoor welding applications.