Experimental Study On Laser Cladding Quality Control Technology

Laser cladding technology is widely used in manufacturing industry,which can improve the surface performance of parts and repair parts by additive manufacturing.With the development of laser cladding technology,it is very important to improve and control the quality of cladding layer.The quality of the cladding layer can be monitored by the real-time detection of the profile of the molten pool,and the corresponding relationship between the cooling rate of the molten pool and the microstructure of the cladding layer can provide experimental basis for adjusting the cooling rate to change the quality of the cladding layer.Based on laser cladding weld pool detection system,temperature measuring system,3D contour measuring instrument,metallographic microscope and Vickers hardness machine,the molten pool size,cladding layer morphology of dilution rate,the cladding layer and wetting Angle,cladding layer micro-hardness,microstructure of cladding layer and molten pool temperature cooling rate the influence of the microstructure and properties of cladding layer,and for the practical application of the cladding materials and microstructure study provides certain theoretical reference for the data.The results show that there is a certain error in the comparison between the size of the molten pool obtained by the laser cladding pool detection system and the actual size of the cladding layer.The dilution rate and wetting Angle of cladding layer under each process parameter showed that the dilution rate under each scanning speed was in line with the process requirements when the laser power was 1000 W,1125 W and 1250 W,and the wettability of cladding layer under each laser power was better when the scanning speed was 4.5 mm/s.The micro-hardness test results of cladding layer under various process parameters show that the overall micro-hardness changes are stable under different scanning speeds of 1000 W,1250 W and 1500 W,and stable under different laser powers of 4.5 mm/s and 5 mm/s,and provide certain data reference for practical application.The comparison between the surface cooling rate of the molten pool and the microstructure analysis of the cladding layer after KALMAN filtering shows that as the cooling rate of the molten pool decreases,austenite increases and ferrite decreases,but when the cooling rate decreases to a certain extent,the microstructure does not change significantly.