Two stainless-steel propeller shafts each measuring more than 20m have recently left our workshops after...
During a planned docking in Landskrona (Öresund Dry Docks), MarineShaft went on board the ferry M/F Stena Saga with its laser cladding equipment.
There was wear at sealing surfaces at cylinder holes on welded frames of a Wärtsilä Pielstick engine. This repair concerned one of four main engines.
The surface tolerance was too narrow, approximately 6mm under the original dimension, to use planing.
MarineShaft suggested to weld up the worn surfaces with laser equipment and machine the surfaces back to original dimensions instead of using space rings. This could all be carried out in-situ.
On board M/F Stena Saga, we installed our laser equipment with all safety processes in mind, covered by curtains, warning signs and safety glasses.
One of the advantages of using laser cladding is to avoid high heat input to the surrounding areas of the frame. This technique is also accurate.
We used the filler material Inconel 625 for rebuilding the surfaces. Inconel 625 is ideal for reconstruction. Each layer thickness is 0.8mm. After welding up the surfaces, we installed our mobile machining tool for re-machining of the 12 surfaces at the cylinder holes.
M/F Stena Saga went out of dock as planned.
Now, Stena Line will evaluate the repair and decide if this will be carried out on the remaining three main engines during the next dockings.
We thank Stena Line and their team on-board for a great co-operation.
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