Simulation Of Temperature Field In Laser Cladding And Study Of Laser Scanning Sequence Method

Laser cladding technology is more and more mature,and its application scope is also increasing.Laser cladding is usually used for remanufacturing plate and shaft parts.Because the laser cladding process belongs to the energy loading process,it is inevitable to produce stress and plastic deformation,which will cause the parts to lose the original shape precision after the cladding.In order to restore the original size of parts,two parts must be processed after cladding.In order to reduce the deformation of the parts after laser cladding,and to reduce the workload of the two processing of the parts,the influence of different laser scanning sequence methods on the deformation of the substrate is studied in this angle.Due to the very uneven distribution of the temperature field of the substrate during the laser irradiation,the uneven distribution of temperature field will eventually cause the deformation of the cladding parts.In order to make the parts smaller after the cladding,we should make the temperature field distributed more evenly in the parts of the cladding process.Based on this theory,three laser scanning sequence methods are studied,which are one way successive scanning sequence method,the temperature mean minimum scanning sequence method,and the temperature variance minimum scanning order method.In this paper,the temperature field of laser cladding is numerically simulated by ANSYS software,and the scanning order of the three scanning methods is determined through the solution of temperature field.According to the results of numerical simulation,the temperature fields and temperature gradients produced by three kinds of laser scanning sequences are analyzed and compared with each other.A laser cladding experiment was carried out using 45 steel rectangular plates.During the experiment,the thermocouple was fixed around the plate cladding area with a high temperature adhesive.The temperature and time history curve of the sample particular point was collected in real time.The reliability of the temperature field simulation of the laser cladding was verified by the curve.At the same time,the scanning order of the minimum mean temperature in the experiment was analyzed.The distribution of the temperature field produced.After analyzing the effect of three laser scanning sequence on the temperature field,the hardness of the cladding layer,the scanning result of the cladding layer and the deformation of the plate sample produced by the three scanning order were compared.Finally,according to the requirement of shape control,the advantages and disadvantages of three laser scanning sequential methods are analyzed.