The line is made up of two parts. The first one is a pressing line starting with strip where the right or left parts of the joint are executed. The strip is inserted in the press where an suitable mobile die cuts the piece before forming. This cut has a conical form to allow the saving of material. Transfer with 3 arms to pass from the cut to the forming and then trimming (with scrap) and then unloading/stacking. Unloading with automatic descent and automatic displacement of the package. The second part is a seam folding machine to assemble the two parts (right-left) of the elbow. With a hydraulic sequencing the seaming of the two pieces is executed, prepared in the adjacent press.