MOBILE ASSEMBLY FOR THE INSTALLATION OF CONDUITS BY WELDING SUCCESSIVE TUBULAR ELEMENTS

摘要

One or two vehicles have automatic driving units for lining up the spindles of the operating units joined to hollow shafts inserted in the units which are to be welded. Each shaft bears, at its free end, a mandrel to be friction fitted simultaneously in the unit to be welded and in the previously welded unit to ensure that the ends of the two tubes coincide precisely while they are being welded.