Will a flux welder weld steel?

Excuse me, I have a technical question regarding the capabilities of a flux welder. Could you please clarify if a flux welder is indeed capable of welding steel? I've heard conflicting opinions, some stating that it's specifically designed for welding aluminum, while others argue that it can handle various metals, including steel. Given the importance of material compatibility in welding, I'd appreciate a definitive answer on this matter. Could you elaborate on the welding process and the types of materials that a flux welder is typically suited for? Thank you for your time and expertise in this field.