Which type of welding wire is primarily used in FCAW?

Flux-cored wire is specifically designed for flux-cored arc welding (FCAW) applications. This type of wire contains a core that is filled with flux material, which serves several important functions during the welding process. The flux generates a shielding gas when heated, protecting the weld from contamination by atmospheric gases, and it helps to stabilize the arc for improved weld quality.

The use of flux-cored wire allows for excellent adaptability to various welding conditions and positions, making it a preferred choice for outdoor welding and in situations where wind could affect the shielding of the weld pool. Additionally, flux-cored wire can often be used with or without shielding gas, further enhancing its versatility in different environments.

Other types of wires, such as solid wire, are not primarily used in FCAW because they do not contain the core flux that is essential for the process. Routed wire and multi-core wire are also not associated with FCAW, as they do not fulfill the specific characteristics needed for this welding technique. Thus, the correct answer clearly highlights the unique design and functionality of flux-cored wire in FCAW.