Specialized equipment for large diameter stationary tank welding. Designed to apply horizontally submerged arc. They work with Lincoln Electric submerged arc.
It is placed over the same tank with two motorized wheels, the arcs are towards the tank wall and have a band which supports the flux and so the arc can be opened. The power sources lay on the floor. It includes a cage where the operators stand.
Single or double arc availability, it is the quickest way to manufacture a large stationary tank.