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Component Repair Using Laser Direct Metal Deposition
Pinkerton, Andrew; Wang, W; Li, Lin
Proceedings of the Institution of Mechanical Engineers - Part B: Journal of Engineering Manufacture . 2008;222:827-836.
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Abstract
Recent studies have indicated that Laser Direct Metal Deposition can be used for repairing deep or internal cracks and defects in metallic components. In order to implement the method it is necessary to machine a groove or slot to the depth of the defect and refill it. This work investigates advantages and potential problems with the technique and compares the results from using two different slot geometries: one rectangular and one triangular in cross section. H13 hot work tool steel components are used and H13 powder deposited using a 1.5 kW diode laser and lateral nozzle. Different combinations of deposition parameter are tested and each sample analyzed in terms of mass deposition rate, deposition microstructure, evidence of porosity, size of the heat affected zone and microhardness. Results are evaluated using statistical techniques and the important parameters that control each variable identified. The work evidences that the method can high produce quality repairs but porosity at the boundaries between the original part and added material is a problem, leading to internal defects. Correct selection of deposition parameters is essential to prevent such defects.