Analysis of Hump Defect Suppression Strategy for High Speed Laser Wire Deposition

Abstract

In the high-speed laser wire deposition process, it is easy to produce defects such as humps. This paper utilizes high-speed cameras to observe the flow behavior of the molten pool in real-time during the high-speed laser wire deposition process. Based on the physical phenomena involved in high-speed laser wire deposition, a thermo-mechanical coupling mathematical model of the molten pool at high speeds was established. Numerical simulation studies on the formation process of hump defects were conducted. In the model, different thermal physical parameters and thermal input conditions were preset to comparatively analyze the formation process of hump defects during high-speed laser wire deposition. This revealed the formation mechanism of hump defects in the high-speed deposition process of aluminum alloy laser wire, and provided feasible strategies for suppressing hump defects in actual processes.

Keywords: Laser wire deposition, Hump defects, Numerical simulation, Formation mechanism