Liftable equipments for longitudinal welding of tubes and sheets with different welding process: Tig, Plasma, Laser, Mig-Mag and Submerged Arc. They are 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. In BSL LIFTABLE series the supporting rod in copper and the bar holding the external pressing plate can move vertically to adjust the unit according to the diameter of the tube to weld. In the lower part of the machine there’s a set of rollers to ensure smooth closure of pipes’ edges and loading/unloading of the pieces.