FCAW, or Flux-Cored Arc Welding, is a welding process that uses a tubular wire filled with flux to create a weld. The flux inside the wire helps to protect the weld from contamination and improves the quality of the joint. This method can be used with or without shielding gas, making it versatile for various applications, especially in outdoor environments. FCAW is commonly used in construction, shipbuilding, and manufacturing due to its efficiency and ability to weld thick materials. It is particularly favored for its speed and the ability to produce strong welds in a single pass, making it a popular choice among welders.