This is known informally as "dual shield" welding. Operator skill is a major factor as improper electrode manipulation or machine setup can cause porosity.Īnother type of FCAW uses a shielding gas that must be supplied by an external source. As with all welding processes, the proper electrode must be chosen to obtain the required mechanical properties. Some disadvantages are that this process can produce excessive, noxious smoke (making it difficult to see the weld pool). Also, windy conditions need not be considered.
FCAW WELDING PORTABLE
This type of FCAW is attractive because it is portable and generally has good penetration into the base metal. It also contains various ingredients that when exposed to the high temperatures of welding generate a shielding gas for protecting the arc. However, this core contains more than just flux. This is made possible by the flux core in the tubular consumable electrode. One type of FCAW requires no shielding gas. An externally supplied shielding gas is sometimes used, but often the flux itself is relied upon to generate the necessary protection from the atmosphere, producing both gaseous protection and liquid slag protecting the weld.
FCAW requires a continuously-fed consumable tubular electrode containing a flux and a constant- voltage or, less commonly, a constant- current welding power supply. Flux-cored arc welding ( FCAW or FCA) is a semi-automatic or automatic arc welding process.
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