Impact of Laser Additive Enhanced Powder Feeding Methods on Melt Pool Temperature Field

The surface of Q345 steel are coated with the Fe62 alloy powder by the synchronous powder feeding method and the prepositioned powder feeding method. The impacts of the two methods on the laser pool forming rate and the temperature field are tested and analyzed with a Charge-Coupled Device (CCD) colorimetric thermometer. The results indicate that the laser pool has faster forming rate, more stable and homogeneous temperature field with the synchronous powder feeding method than the prepositioned powder feeding method under the same conditions. The outcomes are of great significant to optimize the process of the laser additive enhancement technology