LASER CLADDING FOR SURFACE PROTECTION

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Authors
  1. Hewitt, J.
  2. Merchant, V.E.
Corporate Authors
Laser Inst, Edmonton ALTA (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The Laser Institute combines technical and economic feasibility studies with routine cutting, welding, case hardening, and cladding jobs at its affiliated Job Shop. Laser weld overlaying, or cladding, is performed on a production basis at The Laser Institute. Filler metal is deposited into the molten pool created by the partially focused beam of a 5kW carbon dioxide laser on the metal surface. A variety of different powder and wire feed devices have been developed at The Laser Institute, for adding filler material. The application of this technology to repair the seating surface of diesel engine valves, using procedures developed at The Laser Institute, will be described. The effect of laser processing conditions on the properties of Stellite 6SF deposits has been determined. Fineness of the microstructure, as quantified by the secondary dendritic arm spacing (SDAS), was measured as a function of the deposition conditions, and showed approximate agreement when compared to a calculation based on the known dependence of dendritic arm spacing on cooling rate. Laser weld overlays of Nistelle C-276 were produced using a 5 kW carbon dioxide laser and a modified plasma transferred arc welding torch as a means of delivering powder metal overlay material to the weld pool. Low dilution, crack free deposits with a minimum of porosity were deposited on mild steel substrates. TRUNCATED
Report Number
DREA-NAMT-95-3-PAP-3 — CONTAINED IN 99-00779
Date of publication
30 May 1995
Number of Pages
13
DSTKIM No
99-00793
CANDIS No
510357
Format(s):
Hardcopy;Document Image stored on Optical Disk

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