LASER CLADDING OF MARINE COPPER ALLOYS

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Authors
  1. Magee, K.H.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Laser Inst, Edmonton ALTA (CAN)
Abstract
Copper based alloys are suitable for application in marine service due to their inherent anti-fouling properties, and their corrosion resistance in quiescent or laminar flowing seawater. Nickel-aluminum bronze is one such alloy frequency used for the manufacture of components including ship propellers and valves used in seawater handling systems. Despite the superior performance of these alloys, corrosion eventually causes sufficient damage to necessitate costly component replacement. For instance, selective phase corrosion causing dealuminification is generally the cause for replacement of seawater handling valves. Repair weld overlaying of damaged valves for subsequent reuse offers a potential method to reduce the maintenance cost. Laser weld overlaying techniques have been successfully developed for the repair of nickel-aluminum bronze valves using the energy froma continuous wave, carbon dioxide laser. A repair procedure using 1300 J/cm to 1500 J/cm of heat input, and injection of 0.25 mm diameter wire overlay material has been developed for the valve seat. The procedure was successfully applied to an actual marine valve. A pintle repair procedure utilizing 800 J/cm of energy and wire injection has also been developed, although additional fine tuning of the process may be required. TRUNCATED
Report Number
DREA-CR-94-424 — Contractor Report
Date of publication
01 Apr 1994
Number of Pages
67
DSTKIM No
94-05439
CANDIS No
145329
Format(s):
Hardcopy;Document Image stored on Optical Disk

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