The large rudder stock had turned inside the steering gear leaving scratches and marks on the upper part of the rudder stock. Furthermore, the rudder blade and rudder stock connection had suffered damage.
The steering gear rotor inner sleeve was removed. The rudder stock´s lower cone had been damaged.
MarineShaft has class approval to carry out class approved laser cladding and micro welding, and both “cold” welding techniques were used for this repair. Both techniques do not require PWHT after welding and are well-proven repair methods for parts that do not tolerate regular welding.
The damaged areas were machined and prepared for welding, and liquid penetrant inspection was carried out before laser cladding. The spots/marks were repaired by micro welding – a welding technique that is ideal for smaller spots.
After machining the damaged areas on the rudder stock's lower cone and the rudder stock´s upper journal, MarineShaft welded up the areas by laser cladding. Hereafter the rudder stock was machined, and NDT tests were carried out ensuring that everything went according to class regulations.
The damages inside the rudder cone were machined and fitted to the new dimension of the rudder stock cone. The rudder stock was treated with rust protection. On-site MarineShaft assisted the yard with mobile machining of the rudder trunk.