Laser Metal Deposition Employing Scanning Optics
A.G. Demir and B. Previtali
Laser metal deposition (LMD) as an additive manufacturing (AM) processes is characterized by high deposition rate, high material usage and possibility of building on existing components. The combination of directed powder with scanning optics can open up different possibilities combining high deposition rates and improved detail on demand. The main aim of this work is to present a preliminary study on the application of laser metal deposition with scanning optics and 1 kW multi-mode fibre laser. First, the hardware developed for the LMD process with scanning optics, in particular the custom nozzle for powder delivery is presented. Then, a simplified thermal model is discussed for a better comprehension of the effect of the scanning parameters on the thermal cycle. LMD experiments are carried out implementing the outcomes of the analytical model, varying laser power and feeding speed. The results depict the feasibility of concept for high area deposition with further flexibility in track width control.
Keywords: Fibre laser, scanning optics, laser metal deposition (LMD), additive manufacturing (AM), analytical thermal model, directed energy deposition, apparent spot