The use of CCD cameras for recording the area of high power radiation exposure during laser cladding process is an urgent task in a view of low cost of used equipment and high information content of obtained graphic data. This approach allows real-time recognition of geometric primitives in melt pool area and based on their analysis to evaluate the quality of processing operation. The main objective of the study was to eliminate, by using external illumination, a large dynamic difference in brightness, which negatively affects the quality of images obtained. As a result of the experiments, it was found that the most effective configuration of the video recording system for laser powder surfacing process is the location of camera and illumination module against the direction of head movement. The developed illumination system for the radiation exposure area made it possible to provide conditions acceptable for the automated recognition of images obtained by the CCD camera.
A brief analysis of powders used in the industry for surfacing on the work surfaces of critical parts is given in order to increase their wear resistance. The results of experimental studies on the choice of parameters of gas-powder cladding modes are presented. The cladding process was carried out by a laser robotic complex with a coaxial feed of powder to the surfacing zone. The substrate used steel grade 08H18N10T, which was applied to the melt of wear-resistant powder grade PR-08H17N8S6G. The use of ytterbium fiber laser allowed to reduce the heat supply to the surfaces, which significantly reduced the residual stresses in the workpiece. Variable parameters of the laser cladding process were the output power of laser radiation, processing speed, and powder mass flow rate. During visual inspection, the absence of pores and cracks were used as the estimated indicators of the cladding. The study of macro geometry single clad track was conducted on cross section of the clad. During measurements, the quality of a single clad track was determined by its geometric dimensions: clad height, clad width, contact angle between the tangent to the cladding surface and the substrate plane, as well the depth of the mixing layer of the surfaced and substrate materials. According to the results of experimental studies of the selected optimal mode, providing a cladding track with a clad height above 1 mm; clad width 2.5 mm; the depth of the mixing layer – 0.2 mm; contact angle between the tangent to the clad surface and the substrate more than 50º. This work was financially supported by the Ministry of Science and Higher Education of the Russian Federation. Agreement on the provision of subsidies No. 075-15-2019-1833 dated December 03, 2019. Unique identifier PNI RFMEFI60419Kh0245.
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