The solidification crack due to S and P is not a major concern for ferrite structure steel. The FACW processes incorporated with most materials have a difficulty to control the chemical composition effectively compared to other welding processes. The limitation of chemical composition in FCAW is the equal to those of other welding processes or wider. Hence the use of FACW is normally permitted for less-critical components.

See API TR938-B-2008 and Euroweld technical reports.