Metal cored wires have better efficiency and higher welding speed compared to rutile cored wires and solid wires (SG2, SG3 etc.).
Cored wires are softer than solid wire. Due to this difference, rollers in wire feed system are different from rolls in gas metal arc welding.
Flux cored wires are welding wires manufactured by filling a steel strip in pipe form with various chemical compounds (core).