M/V POSEIDON S of ELIOS NAVIGATION suffered severe damage on the shaft line resulting in a bend propeller shaft.
The classification society Bureau Veritas, proposed to the customer our company as approved experts in laser cladding and machining of marine shafts and related components.
The shaft was delivered to our workshop, subjected to NDT inspection, dimensional measurements and run-out. It was found that the bending was 6.5mm at the conical and threaded portion of the shaft.
The shaft was stress-relieved to remove any remaining stresses from the plastic deformation and rough machined on a CNC turning lathe in the way of the journals, the conical section and the threaded end, to remove-even the bending the shaft. After that it was pre-heated followed by laser cladding buildup of above mentioned rough machined areas. Prior to machining, it was stress-relieved again according to our approved procedure.
The final machining was carried out on our heavy duty CNC turning lathe. Before reaching the final dimensions stated on propeller shaft maker’s drawing, a team of our engineers visited the shipyard where the propeller was situated, to inspect, measure and 3D scan the conical bore. The results were analyzed and compared with the 3D model of the propeller shaft based on maker’s drawing. The final machining of the conical portion of the shaft was carried out based on the analysis that we carried out and the result was a perfect fit, evidenced also by the shipyard personnel who supervised our team of technicians doing the propeller-shaft fitting.
