On-Line Detection For Laser Additive Manufacturing Based On Temperature Field Characteristics

Laser additive manufacturing is a thermal process in which the laser beam dynamically melts and solidifies the powder material, not only the solidification structure is dominated by the heat transfer process, but the formation of various defects is also closely related to the thermal history of the forming process. In this paper, the temperature field characteristics of several surface defects in laser additive manufacturing were explored by using numerical simulation method, and experimental verification was carried out. The results confirm that it is an effective way for online defect detection by using the temperature characteristics.