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Reclamation of Rudder Posts
The following application can be completed with an Arc Spray or Flame Spray System. This particular example explores the Arc Spray System being utilised.
Reason for use: Reclamation of worn rudder posts.
The Shipping Industry, like any other Industry, has its fair share of wear problems. These are generated by the very harsh conditions of a Marine Environment; ships are sometimes at sea for months at a time with limited regular maintenance to some of the extreme areas.
The rudder post which will only have limited access during a voyage can be one of the offending areas. The inclusion of sand, salt water or other debris into the bearings will create wear on the rudder post leading to possible seizure and loss of steerage. By using the Metallisation Arc spray Process, it is possible to apply a coating of 316 Stainless Steel onto the worn areas of the rudder post bringing them back up to the original size at a very small percentage of the replacement cost and enabling the vessel to be back in service in a very short period of time.
Equipment: Metallisation Arc Spray Pistol
Materials
Bond Coat - MSSA 75 Arc Bond.
Main Deposit - MSSA S16 Wire - Used to produce a dense corrosion resistance coating.
Cleaning
- Steam clean if equipment available.
- Degrease by solvent vapour if equipment available.
- Inspect for longitudinal distortion, cracks or faults taking the shaft below the manufacturers recommended operating tolerances.
NOTE: Metal sprayed deposits do not impart any strength to base materials.
Pre-Machining
Rough turn or grind areas being reclaimed to a depth of 1.25mm (0.050”), machining their length the width of the bearings plus an allowance of 25mm (1”) either side.
Recommended Depth of Undercut
Diameter of Shaft | Depth of Cut | |
mm | 0.001 inch | |
50 -100mm (2 - 4") | 1.25 | 50 |
100 - 150mm (4 - 6") | 1.50 | 60 |
Over 150mm (Over 6") | 1.75 | 70 |