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Different strategies to eliminate Start-Stop defects on laser tracks formed during high power laser cladding

Bachelor thesis project: students applied and experimental physics

Laser clad Fe and Co-based coating on cast iron substrate is a potential candidate for replacement of inserted valve rings currently used in automotive industry.

Objective: The main aim of this project is to propose, study and evaluate different approached for elimination of geometrical defects formed in the laser tracks during the start or stop of laser cladding process and their overlapping. This elimination is especially required, when closed loop of laser clad track is required which is the case of cladding of valve seats inside the diesel engine head.
Experimental techniques: Laser cladding experiments will be performed using the newest 3.3 kW Fiber laser system with wavelength of 1.07 µm, modern 5 axis CNC table and double hopper Twin 10C powder feeding system. Geometry and laser track defects will be studied by optical, confocal and electron microscopy.

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Fig: Co based coatings on cast iron substrate created by spiral and rectangular overlapping of indivudual laser tracks (left) and their cross-sections for single, double and triple clad layers (right).

Contact:
Dr. Vasek Ocelik, kamer gebouw 13.017, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , Phone: 050- 3633407
Prof.dr. J.Th.M. De Hosson, kamer gebouw 13.041, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it