Papers by Keyword: Variable-Spot Cladding

Abstract: Analyze the contradiction of laser cladding rapid prototyping between cladding efficiency and cladding precision, this paper advanced laser variable-spot cladding process with small facula outlining border of workpiece and big facula filling in central section of workpiece in order to improve the influence of “Step effect”. Based on the patent technology of “Hollow laser beam and internal power feeding”, the experiments of laser variable-spot overlap cladding are carried out on the substrate of 45# steel with a novel device of coaxial inside-beam power feeding. The experimental results were analyzed to provide a theoretical basis for the promotion and application of laser variable -spot overlap cladding.

Abstract: In modern surface modification manufacturing technology, laser cladding is a high-tech which has good prospects for development. However, for the large area laser cladding surface modification, there has the contradiction between cladding efficiency and cladding accuracy of the cladding. If using the smaller spot, it will be inefficient, if the spot increasing, the accuracy of marginal part of the cladding will be poor, the "stage effect" will be obvious. The variable spot powder feeder is designed, and the variable spot cladding process with small facula outlining border and big facula filling in central section is introduced, which resolves the contradiction between the two effectively. Experimental proves that surface quality with variable spot cladding is better. In the overlap area, due to the second lixiviation caused by repeated heating, the microhardness value of multi-track overlap cladding is higher than the structure in the non-overlap area.