Do you need gas to weld FCAW?

No, gas is not required for Flux-Cored Arc Welding (FCAW) when using self-shielded flux-cored wires. These wires contain a flux that generates a protective gas during the welding process, allowing for effective welding without external shielding gas. However, if using gas-shielded flux-cored wires, an external shielding gas may be necessary for optimal performance.