This equipment is for circumference welding of curved bottoms and large tubes by means of a SUBMERGED ARC procedure. It is made up of a base with a linear motion system for translation of the Cartesian manipulator over a length of 18000 mm. The front part of the aluminium bar has a submerged arc torch able to rotate to adjust to the piece to be welded. This rotation movement is effected by two pairs of 20000kg motor-run rollers which may work on the same piece on an electrical axis and also individually, which makes it possible to obtain two working stations. The proper positioning of the submerged arc torch on the welding joint is made possible by an electronic proportional probe of our production and a small colour video camera.