New approach in selective laser cladding

摘要

The new approach in selective laser cladding using conical laser beams has been elaborated. Initial round laser beam is divided into 2 circular beams with regulated distribution of the laser power throughout the circular beams. Circular beams are transformed to conical beams, which are focused separately on the surface and on the deposited material for heating. The laser energy delivery to powder stream is very efficient because a total uniform absorption of laser energy in the dense powder stream (104-1051/cm3). Under wire deposition the heating of substrate reduces the residual stresses due the reduction temperature gradients and compensates heat losses from deposition zone by thermal conduction. The required power density for melt contact formation is significantly reduced.