A welding tank cart system for providing efficient transportation of welding tanks and welding supplies. The welding tank cart system includes a frame, a pair of side wheels, a wheel support connected to the frame, and a front wheel connected to the wheel support, wherein the front wheel is comprised of a swivel wheel. A tray is pivotally connected within the frame to provide for self-leveling regarding of the attitude of the frame. A chain crank is connected to the frame for tightening a chain structure about the welding tanks.