Flux-Core Arc Welding (FCAW) is a variation of the Gas Metal Arc Welding (GMAW) process, and is
generically considered a "semi-automatic" process. Like GMAW welding, consumable wire is fed into the
molten weld pool at a controlled rate. Flux-Core arc welding can be further characterized as self-shielding
FCAW(S) or gas shielded FCAW(G). FCAW(S) is commonly chosen in structural steel fabrication due to
its advantage of providing high deposition rates. For the purpose of this discussion, as it relates to pressure
boundary weldments of radiographic quality, only the gas shielded process, FCAW(G), will be discussed in
any detail.