Multi-laser fusion process with pre-heating for additive Manufacturing

摘要

A 500°C preheating system is used in multi-laser fusion processes to overcome defect formation, and to successfullymanufacture highly dense, crack-free, low distortion parts from 1.2343 hot working steel and aerospace grade Ti6Al4VELI. With a three-laser opto-mechanical focusing and scanning system, we demonstrate high precision laser metal fusionover 300mm diameter fullfield overlapping scan fields at high productivity. Results of density, surface quality andmaterial properties are presented. Control of oxygen level in parts and powder is demonstrated over multiple powder reusecycles.