|
12 TON MOTOR ROTOR |
 |
|
A challenge to Atlantic’s innovation and technical skill was the completion of a mechanical repair to a 20 year old 4250 kw motor rotor.
The 280mm drive end shaft had suffered a torsional fatigue failure, the proposed solution being to remove the damaged drive end, counter bore the main body and shrink fit a new manufactured stub shaft into the counter bore.
|
 |
|
The stub shaft was MIG welded to the main body and finish machined; a critical factor was the protection of the windings throughout the repair.
Atlantic Engineering has supported the electrical power industry since 1983, the main service being the reclamation of motor shafts by spiral MIG welding, a process which comes into its own when journals, threads and keyways are severely damaged.
|
 |
|
All weld procedures are approved by 3rd parties such as Lloyds or DNV . Non destructive testing is carried out by our own PCN accredited engineers. |
|
|
CRANKED RUDDER STOCK |
 |
|
A typical Atlantic Engineering emergency project addressed the cranked rudder stock of a 13000 dwt cargo ship, the ship had suffered stern damage during docking.
The repair of the stock, weighing around 9 tonnes, called for the removal of a twist of 12 degrees and a 5mm bend in the upper part of the 465mm diameter stock.
|
 |
This repair was achieved by machining, automatic spiral welding and stress relieving by heating to 620oC, the tiller and pallister were then recut.
In order to preserve the main stainless steel sleeve for further use, portable heat blankets were attached were attached and the sleeve heated to 260oC, it was then possible to remove the sleeve without damage.
|
|
* * * * * * *
* * |
|
SPIRAL WELDING |
|
Confidence in our spiral welding stems from precision engineering control of all parameters to ensure full base material weld fusion; full inter- run fusion; low dilution rates and minimum |
|
|
heat affected zone during
all stages of the process. |
 |
The above photograph shows
a section through a typical motor rotor bearing journal configuration, the quality
of the multi runs of weld being clearly evident. The test piece shown forms part
of our multi-disciplined operator training.
Spiral weld procedures are used extensively and successfully for all types of shaft
reclamation, from ships propeller shafts to small pump shafts, another successful
example is the refurbishment of Simplex type seal liners. |
 |
The repair procedures
carried out at Atlantic Engineering are class approved and restore the liners back
to their original dimensions.
Inconel is typically used for this repair to improve the wear and corrision resistance
of the liner. |
 |
|