PJ Diesel has the skills to repair damaged turbine blades. This is done by a specialized procedure carried out by highly qualified technicians operating in accordance with class approval.
The turbine blades are dismantled, cleaned ultrasonically and accurately measured. An UV inspection is then carried out to detect possible fractures.
Fractured blades are replaced with new ones.
Under certain strictly controlled conditions, our welding is based on a procedure developed through extensive research by metallurgists, and PJD engineers can repair the turbine blades.
The method used is TIG (Tungsten Inert Gas) welding: a technique using a nonfusing electrode at low amperage shielded by an inert gas.
Only a small zone may be exposed to heating, and the operation must be carried out in a closed welding chamber, free from dirt particles and air turbulence, as any draught would disperse the shielding gas, resulting in poor welding.
Afterwards the welded blade is machined, and ground back into its original shape and inspected for cracks using UV/penetrant inspection, and the weight is then checked.
In order to achieve the correct weight distribution, a computer is used to determine the sequence, in which the blades should be mounted on the rotor, which is then ready for balancing.