The applying of the short — term cross correlation in optical diagnostics of melt convection in laser metal deposition

The time dependences of the surface temperature and the surface area of the melt bath during the formation of the single track in the laser metal deposition technology were obtained using a multi-wave optical diagnostics complex. The short - term cross-correlation method was used to analyse the measured parameters of the bath surface, and relationship of the measured parameters with the processes of thermocapillary convection in the melt was shown.

Application features of the multi-wave optical diagnostics complex in the technology of laser metal deposition

The features of the application of the multi-wave complex (MCOD) for optical diagnostics of physical processes under the action of laser radiation on the melt surface in the technology of laser deposition of metals (LMD) are considered. The registration of thermal radiation in different ranges of the optical spectrum is used in the MCOD to evaluate the geometric characteristics of the melt pool and determine the maximum temperature of the melt pool Tmax . The dependences of the track height and the width of the melt pool on Tmax are obtained for different values of the scanning speed. It is shown that in the speed range from 5 to 8 mm/s, the track height practically does not change while maintaining Tmax .