State-of-the art equipment for longitudinal welding of tubes and sheets with different welding process: Tig, Plasma, Laser, Mig-Mag and Submerged Arc. It is equipped with a copper support resisting to wear and tear and heat and with a series of pressing plates in brass alloy that lock the pieces. Pieces with thickness from 0.5 up to 10 mm and lengths which may go from 30 to 8000 mm are joined together thanks to the sturdiness and high precision of the mechanical processing. The BSL series is, in turn, divided into four main categories: standard, liftable, for inside welding and automatic. The standard type is equipped with a supporting rod in copper support at a settled height from the ground and it may have a lifting unit being operated by rollers. What distinguishes the liftable units from the standard ones is that the supporting rod and the bar holding the external pressing plates can be adjusted in height, so that the equipment can be adjusted according to the diameter of the tube being welded. In the lower part of the machine there’s a set of rollers. The BSL series for inside welding is suitable for inside welding of large tubes or sheet metal as its main bar and the torch unit are positioned inside the tube. The automatic machine have the automatic closing cycle of the particular, therefore the operator has only to perform the operations of loading and unloading.